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#!/usr/bin/env texlua
kpse.set_program_name('texlua')
--[[
epspdf conversion utility
0.6.0: first texlua version
0.6.1: allow TeX installation on path with spaces
0.6.2: compatibility fix for luatex 0.81
0.6.3: compatibility fixes for luatex 0.9x
0.6.4: adaptations for newer versions of LuaTeX and ghostscript;
some refactoring; better handling of some corner cases
0.6.5: eliminate .setpdfwrite from ghostscript commandlines,
since this is now considered obsolete
Copyright (C) 2006-2020 Siep Kroonenberg
siepo at bitmuis nl
This program is free software, licensed under the GNU GPL, >=2.0.
This software comes with absolutely NO WARRANTY. Use at your own risk!
Note.
TeX code for cropping pdfs adapted from Heiko Oberdiek's pdfcrop utility
Program structure
- early initialization
- functions for:
- error handling
- file- and path utilities
- other general utilities
- infrastructure: logging and temporary files
- reading and writing settings
- gui function for communicating with frontend
- boundingboxes
- manipulating [e]ps- and pdf files
- the PsPdf object:
- creator functions
- boundingbox handling
- one-step conversion methods
- any_to_any function.
this function checks options, the one-step converters check for success.
- main initialization section:
- collecting system information
- infrastructure: setting up logging and temp directory
- settings:
- defining settings-, descriptions-, options- and auxiliary tables
- read settings
- defining commandline options and help function
- parsing commandline and performing non-conversion options
- calling any_to_any
- finishing up
all calls to external programs work on temporary files with a simple
generated filename. The current directory is a newly-created
temporary directory. So no need to quote names of input- and output
filenames.
POSSIBLE EXTENSIONS
- duplicating epstopdf options
- custom options for gs and pdftops
--]]
-- some general utilities and globals ---------------------------
-- early initializations
eol = false
path_sep = false
if os.type=='unix' then
eol='\n'
path_sep = ':'
else
eol='\r\n'
path_sep = ';'
end
infile = false
outfile = false
bufsize=16000 -- for reading and writing files
-- these `declarations' are not really needed;
-- they are here mainly for my own peace of mind
from_gui = false -- whether epspdf is run from the epspsdtk gui
cwd = ''
-- Windows: miktex, TL or neither.
-- Actual values determined during system-dependent initialization
is_miktex = false
is_tl_w32 = false
-- Luatex 1.09 and later replace epdf with pdfe
-- some global file- and directory names
gs_prog = false
pdftops = false
epsdir = false
rcfile = false
logfile = false
tempdir = false
tempfiles = {}
-- childpath = false
-- os.getenv('path') returns the parents path,
-- so we need to keep track ourselves of the child path
options = false -- actual conversion options
settings = false -- persistent settings; may be stored in config file
descriptions = false -- help strings for settings
gs_options = false
pdf_options = false
pdf_tail_options = false
ps_options = false
gray_options = false
-- logging ------------------------
-- we open and close the logfile anew for each write.
-- failure to open does not constitute an error.
function print_log(s)
local f = io.open(logfile, 'a')
if f then
f:write(s,eol)
f:close()
end
if from_gui then
print(s) -- intercepted by the gui
end
end
function write_log(s)
print_log(string.format('%s %s',
os.date('%Y/%m/%d %H:%M:%S', os.time()), s))
end
function log_cmd(cmd)
write_log('[' .. table.concat(cmd, '] [') .. ']')
end
-- error- and debug -------------------------
-- Simple-minded error handling. At most, we call a function which
-- tries to write the error message to log before re-raising the error.
-- When run from the Tcl/Tk gui, this gui will capture error messages.
function errror(mess)
if infile and outfile then
mess = 'Failure to convert '..infile..' to '..outfile..':\n'..mess
end
if logfile then pcall(write_log, mess) end
-- ignore result of pcall: we can do nothing about failure
error(mess, 2)
end
function warn(mess)
if logfile then write_log(mess) end
print(mess)
end
-- function dbg(mess)
-- if options.debug then
-- warn(mess)
-- end
-- end
-- file- and path utilities ----------------
-- function ep_shortname(path)
-- if os.type=='unix' then
-- return path
-- else
-- -- shortname appears not to work under miktex
-- -- so return original path as a fallback
-- local sp = lfs.shortname(path)
-- return sp or path
-- end
-- end
-- prepend or append dir to path if necessary
function maybe_add_path(dir, append)
local dircmp = path_sep .. dir .. path_sep
local pathcmp = path_sep .. kpse.var_value('PATH') .. path_sep
-- case folding
if os.name=='windows' or os.name=='cygwin' or os.name=='macosx' then
dircmp = string.lower(dir)
pathcmp = string.lower(pathcmp)
end
-- slash flipping
if os.type=='windows' then
pathcmp = (string.gsub(pathcmp, '/', '\\'))
dircmp = (string.gsub(dircmp, '/', '\\'))
end
if not string.find(pathcmp, dircmp, 1, true) then
if not append then -- prepend
os.setenv('PATH', dir..path_sep..kpse.var_value('PATH'))
else -- append
os.setenv('PATH', kpse.var_value('PATH')..path_sep..dir)
end
end
end
function fw(path)
if os.type=='windows' then
return string.gsub(path, '\\', '/')
else
return path
end
end
function absolute_path(path)
--[[ Return absolute normalized version of path, interpreted
from the directory from where the program was called.
We use the fact that lfs.currentdir() always returns an absolute and
normalized path. So we go to the parent directory of path, ask for
the current directory and then combine the current directory with
the base filename.
On windows, texlua has no trouble cd-ing into a UNC path.
The function returns nil if there is no valid parent path.
This might be an issue if path is a directory,
but we shall apply this function only on files.
It is ok if path itself does not exist. --]]
path = fw(path)
local present_dir = fw(lfs.currentdir())
lfs.chdir(cwd)
local parentdir
local filename
if string.match(path, '/') then
parentdir, filename = string.match(path,'^(.*)/([^/]*)$')
if parentdir=='' then
parentdir = '/'
-- on unix, this is an absolute path. on windows, it is not
if os.type=='windows' then
lfs.chdir('/')
parentdir = fw(lfs.currentdir())
end
elseif os.type=='windows' and string.match(parentdir,'^[a-zA-Z]:$') then
parentdir = string.sub(parentdir,1,2)..'/'
else
if not lfs.chdir(parentdir) then
parentdir = nil
else
parentdir = fw(lfs.currentdir())
end
end
elseif os.type=='windows' and string.match(path,'^[a-zA-Z]:') then
-- windows: d:file
parentdir = string.sub(path,1,2)
if not lfs.chdir(parentdir) then
parentdir = nil
else
parentdir = fw(lfs.currentdir())
filename = string.sub(path,3)
end
else
parentdir = fw(lfs.currentdir())
filename = path
end
lfs.chdir(present_dir)
if not parentdir then
return nil
elseif string.sub(parentdir,-1)=='/' then
return parentdir..filename, parentdir
else
return parentdir..'/'..filename, parentdir
end
end -- absolute_path
-- check whether prog is on the searchpath.
-- we need it only under unix,
-- so we save ourselves the trouble of accommodating windows.
-- we return the original string, although we only need a yes or no answer
function find_on_path (prog)
if os.type == 'unix' then
for d in string.gmatch(os.getenv('PATH'), '[^:]+') do
if lfs.isfile(d..'/'..prog) then
return prog
end
end
else
for d in string.gmatch(os.getenv('PATH'), '[^;]+') do
if lfs.isfile(d..'\\'..prog) then
return prog
end
end
end
return false
end -- find_on_path
function dir_writable(d)
-- because directory attributes do not tell the whole story,
-- we actually try to create a file in the directory.
if not lfs.isdir(d) then
return false
end
-- try to create a new file, write to it and delete it afterwards
for i=1,1000 do
local s = d .. '/' .. tostring(i)
if not lfs.isfile(s) then
local fh = io.open(s, "w")
if fh then
fh:write('test')
fh:close()
if lfs.isfile(s) then
if lfs.attributes(s, 'size') > 0 then
os.remove(s)
return true
else
os.remove(s)
return false -- open and write resulted in empty file
end -- lfs.attributes
else
return false -- open and write did not result in a file
end -- lfs.isfile
end -- fh
return false -- filename available; could not open for write
end -- not lfs.isfile
end -- for
return false
end
function system_tempdir ()
local d
if os.type=='windows' then
d = os.getenv('TEMP')
if not d then
d = os.getenv('TMP')
end
else
d = os.getenv('TMPDIR')
if not d then
d = '/tmp'
end
end
-- cygwin: $TEMP=/tmp, root '/' being root of cygwin installation
if d and not dir_writable(d) then
d = false
end
return d
end
-- other general utilities ---------------------------
-- check whether el occurs in array lst
function in_list (el, lst)
if not lst then return false end
for _,p in ipairs(lst) do
if el == p then
return true
end
end
return false
end -- in_list
-- remove leading and trailing, but not embedded spaces
function strip_outer_spaces(s)
s = string.gsub(s, '%s*$', '')
s = string.gsub(s, '^%s*', '')
return s
end -- strip_outer_spaces
function join(t, sep, lastsep)
-- there is a table function concat which does this,
-- but without optional different lastsep
if t==nil or #t<1 then return '' end -- or should we return nil?
local s = t[1]
for i=2,#t do -- ok if #t<2
if i==#t and lastsep then
s = s .. lastsep .. t[i]
else
s = s .. sep .. t[i]
end
end
return s
end -- join
-- combine several tables into one.
-- the parameter is a table of tables.
function tab_combine (t)
local res = {}
for _,tt in ipairs(t) do
for __, ttt in ipairs(tt) do
table.insert(res, ttt)
end
end
return res
end -- tab_combine
-- files ----------------------------------------------------
-- Copy a file in chunks, with optional length and offset.
-- Since files may be very large, we copy them piecemeal.
-- An initial chunk of size bufsize should be plenty to include
-- any interesting header information.
function slice_file(source, dest, len, offset, mode)
-- The final three parameters can be independently left out by
-- specifying false as value
-- Assume caller ensured parameters of correct type.
-- We do not allow negative offsets.
local copy2self = false
if source==dest then copy2self = true end
if os.type=='unix' and
lfs.attributes(source,'ino')==lfs.attributes(dest,'ino') then
copy2self = true
end
if copy2self and not len and not offset and mode~='ab' then
return -- nothing to do
elseif copy2self then
errror('slice_file invoked with identical source and destination '..
source..' and non-simple copy')
end
-- in practice any_to_any already checks for this.
-- in addition, the main program makes a backup if infile==outfile
local sz = lfs.attributes(source, 'size')
if not offset then
offset = 0
elseif offset>sz then
offset = sz
end
if not len or len>sz-offset then
len = sz - offset
end
if not mode then mode = 'wb' end
local buffer=''
local s=io.open(source, 'rb')
s:seek('set', offset)
local copied = 0
local d=io.open(dest, mode)
if not d then errror('slice_file: failed to copy to '..dest) end
local slen = len
while slen>0 do
if slen>=bufsize then
buffer = s:read(bufsize)
slen = slen - bufsize
else
buffer = s:read(slen)
slen = 0
end
if not d:write(buffer) then
errror('slice_file: failed to copy to '..dest)
end
end
s:close()
d:close()
end -- slice_file
function move_or_copy(source, dest)
if lfs.isfile(dest) and lfs.attributes(dest, 'size')>0 then
warn('Removing old '..dest)
os.remove(dest) -- in case of failure, go ahead anyway
end
-- Windows: try first renaming in-place before moving to the right directory
if os.type == 'windows' then
if os.rename(source, source..'.renamed') then
source = source..'.renamed'
end
end
if not os.rename(source, dest) then
slice_file(source, dest) -- bails out on failure
local ok, err_mess = os.remove(source)
if not ok then
warn('Failed to remove old ' .. source .. ': ' .. err_mess)
end
end
end
-- temporary files ----------------------------------------
-- tempdir = false -- will be created later and chdir-ed into
-- tempfiles initialized early to empty table
-- We just name our temporary files nn.<ext> with successive nn.
-- We cannot exclude that another process uses our tempdir
-- so we have to first check for each new file whether it already exists.
-- Epspdf does all the real work from the temp directory.
function mktemp(ext)
local froot, fname, f, g
for i=0,99 do
froot = string.format('%02d.', i)
fname = froot..ext
if ext~='tex' then
if not lfs.isfile(fname) then
f = io.open(fname, 'wb')
if not f then
errror('Cannot create temporary file '..fname)
end
f:close()
table.insert(tempfiles, fname)
return froot..ext -- no need to record pdf name
end
else
-- tex; we also need a pdf
if not lfs.isfile(fname) and not lfs.isfile(froot..'pdf') then
local f = io.open(fname, 'wb')
if not f then
errror('Cannot create temporary file '..fname)
end
f:close()
table.insert(tempfiles, fname)
fname = froot..'pdf'
g = io.open(fname, 'wb')
if not g then
errror('Cannot create temporary file '..fname)
end
g:close()
table.insert(tempfiles, fname)
table.insert(tempfiles, froot..'log')
return froot..ext -- no need to record pdf name
end
end -- if
end -- for
errror('Cannot create temporary file in '..tempdir)
end
function waitasec()
-- stupid windows file locking; assume vista or later
if os.type=='windows' then
os.execute('timeout /t 1 /nobreak >nul')
-- else do nothing
end
-- error checking pointless
end
function cleantemp()
lfs.chdir(tempdir)
if os.type=='windows' then waitasec() end
for _,f in ipairs(tempfiles) do
if lfs.isfile(f) then
local success, mess = os.remove(f)
if not success then write_log(mess) end
end
end
local empty = true
for f in lfs.dir('.') do
if f ~= '.' and f ~= '..' then
empty = false
write_log('Temp dir '..tempdir..' contains '..f..' therefore not removed')
break
end
end
if os.type=='windows' then waitasec() end
lfs.chdir('..')
if empty then
local res, mess
res, mess = lfs.rmdir(tempdir)
if not res then
write_log('Failed to remove empty '..tempdir..'\n'..mess)
end
end
end
-- gs_epsdevice -----------------------
function gs_epsdevice()
local gh = io.popen(gs_prog..' -help')
local s = gh:read("*a")
gh:close()
if string.find(s,'eps2write') then
return 'eps2write'
elseif string.find(s,'epswrite') then
return 'epswrite'
else
return false
end
end
-- settings -----------------------
function write_settings (file)
local f
if file then
f = io.open(file, 'wb')
if not f then
return
end
else -- stdout to be captured by epspdftk
f = io.output()
end
for k, v in pairs(settings) do
if descriptions[k] and file then
f:write(eol, '# ', descriptions[k], eol)
end
f:write(k, ' = ', tostring(v), eol)
end
if file then
f:close()
end
end
function read_settings(file)
-- read and interpret rcfile
-- we shall ignore illegal entries.
local contents
local f
if file then
f = io.open(rcfile, 'rb')
if not f then
return
end
else
f = io.input()
end
contents = f:read(10000)
if file then
f:close()
end
if not contents or contents=='' then
return
end
-- remove initial \r and \n characters
contents = string.gsub(contents, '^[\r\n]*', '');
-- gmatch chops contents into series of non-line-ending characters
-- possibly followed by line-ending characters i.e. in lines
local k, v, vl, vnum
for l in string.gmatch(contents, '[^\r\n]+[\r\n]*') do
l = string.match(l,'[^\r\n]*')
if not string.match(l, '^#') then
k, v = string.match(l, '^%s*([^%s]+)%s*=%s*(.*)$')
if v then v = string.gsub(v,'%s*$', '') end
-- now handle k and v
if k == 'pdf_target' then
-- ignore unless valid option
if in_list(v, pdf_targets) then
settings[k] = v
end
elseif k == 'pdf_version' then
-- ignore unless valid option
if in_list(v, pdf_versions) then
settings[k] = v
end
elseif k == 'ignore_pdftops' then
vl = string.lower(string.sub(v,1,1))
if v == 0 or vl == 'n' or vl == 'f' then
settings.use_pdftops = true
elseif v == 1 or vl == 'y' or vl == 't' then
settings.use_pdftops = false
end
elseif k == 'use_pdftops' then
vl = string.lower(string.sub(v,1,1))
if v == '0' or vl == 'n' or vl == 'f' then
settings.use_pdftops = false
elseif v == '1' or vl == 'y' or vl == 't' then
settings.use_pdftops = true
end
-- final three settings not used by epspdf itself but
-- passed along to epspdftk
elseif k == 'ps_viewer' then
settings.ps_viewer = v
elseif k == 'pdf_viewer' then
settings.pdf_viewer = v
elseif k == 'default_dir' then
settings.default_dir = v
end -- test for k
end -- not matching ^#
end -- for
end -- read settings
function version_added()
for _, v in pairs(pdf_options) do
if string.find(v, '-dCompatibilityLevel') then
return true
end
end
return false
end
function maybe_add_version_parameter()
if options.type=='pdf' and not options.bbox and settings.pdf_version and
settings.pdf_version~='default' and not version_added() then
table.insert(pdf_options, '-dCompatibilityLevel#'..settings.pdf_version)
end
end
-- gui: reading and writing settings -----------
function gui(action)
-- use stdin for reading settings from gui, and stdout for writing
if action=='config_w' then
-- called at start of epspdftk
write_settings() -- to pipe epspdf => epspdftk
os.exit()
elseif action=='config_r' then
read_settings() -- from 'pipe' epspdftk => epspdf
write_settings(rcfile)
os.exit()
else
from_gui = true
end
end
-- boundingboxes ---------------------------------------------------
-- [HR]Bb.coords names same as those of epdf PDFRectangle
-- but the new pdfe simply uses an array
Bb = {}
Bb.coords = {'x1', 'y1', 'x2', 'y2'}
function Bb:from_rect(r)
-- also handle the case that r is a 4-element array:
if not r.x1 then r.x1 = r[1] end
if not r.y1 then r.y1 = r[2] end
if not r.x2 then r.x2 = r[3] end
if not r.y2 then r.y2 = r[4] end
for _,k in ipairs(self.coords) do
if not r[k] or type(r[k])~='number' then
errror('from_rect called with illegal parameters')
end
-- sanity check on size
-- FIXME: this limit is far too high
if r[k]+.5==r[k] or r[k]-.5==r[k] then
errror('Bb:from_rect: ' .. r[k] ..' greater than maxint')
end
local b = {}
local eps = 0.000001
b.x1, b.x2 = math.floor(math.min(r.x1, r.x2) + eps),
math.ceil(math.max(r.x1, r.x2) - eps)
b.y1, b.y2 = math.floor(math.min(r.y1, r.y2) + eps),
math.ceil(math.max(r.y1, r.y2) - eps)
if b.x1==b.x2 or b.y1==b.y2 then
errror('from_rect: width or height is zero')
end
setmetatable(b, {__index=self})
return b
end
end
Bb.bb_pat = '^%s*%%%%BoundingBox:'
Bb.bb_end = '^%s*%%%%BoundingBox:%s*%(%s*atend%s*%)'
function Bb:from_comment(s)
local p = self.bb_pat..'%s*([-+%d]+)'..string.rep('%s+([-+%d]+)',3)
local b = {}
b.x1, b.y1, b.x2, b.y2 = string.match(s, p)
if not b.y2 then
errror('Bb.from_comment: illegal boundingbox string ' .. s)
end
for _,k in ipairs(self.coords) do
b[k] = tonumber(b[k])
end
return Bb:from_rect(b)
end
function Bb:nonnegative ()
return self.x1>=0 and self.y1>=0
end
function Bb:comment()
-- if options.debug then print(debug.traceback()) end
return string.format('%%%%BoundingBox: %d %d %d %d',
self.x1, self.y1, self.x2, self.y2)
end
-- hires boundingboxes ---------------------------------------------
HRBb = {}
setmetatable(HRBb, {__index=Bb})
function HRBb:from_rect(r)
-- also handle the case that r is a 4-element array:
if not r.x1 then r.x1 = r[1] end
if not r.y1 then r.y1 = r[2] end
if not r.x2 then r.x2 = r[3] end
if not r.y2 then r.y2 = r[4] end
for _,k in ipairs(self.coords) do
if not r[k] or type(r[k])~='number' then
errror('from_rect called with illegal parameters')
end
-- sanity check on size
if r[k]+.5==r[k] or r[k]-.5==r[k] then
errror('HRBb:from_rect: ' .. b[k] ..' greater than maxint')
end
local b = {}
b.x1, b.x2 = math.min(r.x1, r.x2), math.max(r.x1, r.x2)
b.y1, b.y2 = math.min(r.y1, r.y2), math.max(r.y1, r.y2)
if b.x1==b.x2 or b.y1==b.y2 then
errror('from_rect: width or height is zero')
end
setmetatable(b, {__index=self})
return b
end
end
HRBb.bb_pat = '^%s*%%%%HiResBoundingBox:'
HRBb.bb_end = '^%s*%%%%HiResBoundingBox:%s*%(%s*atend%s*%)%s*$'
function HRBb:from_comment(s)
local p = self.bb_pat..'%s*([-+.%deE]+)'..string.rep('%s+([-+.%deE]+)',3)
local b = {}
b.x1, b.y1, b.x2, b.y2 = string.match(s, p)
if not b.y2 then
errror('HRBb.from_comment: illegal boundingbox string ' .. s)
end
for _,k in ipairs(self.coords) do
b[k] = tonumber(b[k])
end
return HRBb:from_rect(b)
end
function HRBb:nonnegative ()
return self.x1>=0 and self.y1>=0
end
function HRBb:comment()
return string.format('%%%%HiResBoundingBox: %f %f %f %f',
self.x1, self.y1, self.x2, self.y2)
end
--[[
-- no longer used: gs handles this
-- call this one also via pcall
function HRBb:wrapper()
-- local fn = mktemp('ps')
-- local f = io.open(fn, 'wb')
-- f.write(string.format('<< /PageSize [%f %f] >> setpagedevice\n',
-- self.x2 - self.x1, self.y2 - self.y1))
-- f.write(string.format('gsave\n%f %f translate\n', -self.x1, -self.y1))
-- f:close()
-- return fn
return string.format(
'<< /PageSize [%f %f] >> setpagedevice gsave %f %f translate',
self.x2 - self.x1, self.y2 - self.y1, -self.x1, -self.y1)
end
--]]
-- manipulating eps/ps/pdf files -----------------------------------
function identify()
local f = io.open(infile, 'rb')
if not f then
errror('Failure to open '..infile..' for identification')
end
local filestart= f:read(23)
f:close()
if not filestart or filestart=='' then
return false
elseif string.match(filestart,'^\197\208\211\198') then -- c5 d0 d3 c6
return 'epsPreview'
elseif string.match(filestart,'^%%!PS%-Adobe%-%d%.%d EPSF%-%d%.%d') then
return 'eps'
elseif string.match(filestart,'^%%!PS%-Adobe%-%d%.%d') then
for _, p in ipairs({'.eps', '.epi', '.epsi', '.epsf'}) do
if string.sub(string.lower(infile), -1-string.len(p),-1) == p then
return 'eps'
else
return 'ps'
end
end
return 'ps'
elseif string.match(filestart, '^%%PDF') then
return 'pdf'
else
return false
end
end -- identify
function pdf_props(path)
local pdfdoc, pgs, maver, miver
if pdfe then
pdfdoc = pdfe.open(path)
if pdfdoc then
pgs = pdfe.getnofpages(pdfdoc)
maver, miver = pdfe.getversion(pdfdoc)
end
if not (pdfdoc and pgs and maver and miver) then
errror('pdfe failed to get information about '..path)
end
pdfe.close(pdfdoc)
else
local cat
pdfdoc = epdf.open(path)
if pdfdoc then
cat = pdfdoc:getCatalog()
if cat then
pgs = cat:getNumPages()
end
maver = pdfdoc:getPDFMajorVersion()
miver = pdfdoc:getPDFMinorVersion()
end
if not (pdfdoc and pgs and maver and miver) then
errror('epdf failed to get information about '..path)
end
-- epdf.close(pdfdoc)
end
-- if os.type=='windows' then waitasec() end
if maver > 1 then
print(path..' has pdf major version \n'..tostring(maver)..
' which is unsupported;\n'..
'Continuing with fingers crossed...')
end
return pgs, miver, maver
end -- pdf_props
function info()
local intype = identify()
if not intype then
print(infile..' has an unsupported filetype.')
elseif intype~='pdf' then
print(infile..' has type '..intype..'.')
else
local pgs, miver, maver = pdf_props(infile)
print(infile..' has type pdf, version '..tostring(maver)..
'.'..tostring(miver)..' and has '..tostring(pgs)..' pages.')
end
os.exit()
end
-- PsPdf object -------------------------------------------------
PsPdf = {}
-- creators
function PsPdf:new(ext)
local psp = {}
setmetatable(psp, {__index = self})
-- assign temp file
psp.path = mktemp(string.lower(ext))
if string.lower(ext)=='pdf' then
psp.type = 'pdf'
elseif string.lower(ext)=='eps' then
psp.type = 'eps'
elseif string.lower(ext)=='ps' then
psp.type = 'ps'
else
psp.type = false
end
if psp.type=='eps' then
psp.pages = 1
end
psp.bb = false
psp.hrbb = false
return psp
end -- PsPdf:new
function PsPdf:from_path(path)
local psp = {}
setmetatable(psp, {__index = self})
psp.path = path
if lfs.isfile(path) then
-- turn existing file into PsPdf object.
psp.type = identify(psp.path)
if psp.type=='pdf' then
psp.pages, psp.miver, psp.maver = pdf_props(psp.path)
end
else
errror('PsPdf:from_path called with non-existant file '..path)
end
if psp.type=='eps' then
psp.pages = 1
end
psp.bb = false
psp.hrbb = false
-- only calculate when needed
return psp
end -- PsPdf:from_path
-- do we need to downgrade the pdf to a lower version?
-- consider [e]ps lower than any pdf version
function PsPdf:to_downgrade()
if self.type~='pdf' then
return false
elseif options.type~='pdf' then
return true
elseif settings.pdf_version=='default' then
return false
elseif settings.pdf_version~='default' and
self.maver+0.1*self.miver-0.001 > tonumber(settings.pdf_version) then
-- -0.001: exact binary representation of pdf_version not guaranteed
return true
else
return false
end
end
--[[ getting boundingbox property from file itself --------------
get_bb_simple: use only for eps PsPdf objects we generated
ourselves, so we can assume that the bbox comments are in the header
and the hires bb lies within the lores bb.
Of course the file itself is not rewritten.
--]]
function PsPdf:get_bb_simple()
if self.type~='eps' then
errror('get_bb_simple called with non-eps file '..self.path)
end
self.bb = false
self.hrbb = false
local slurp = false
local f = io.open(self.path, 'rb')
if f then
slurp = f:read(bufsize)
f:close()
end
lines = {}
for l in string.gmatch(slurp, '[^\n\r]+') do
if string.match(l, Bb.bb_pat) then
self.bb = Bb:from_comment(l)
elseif string.match(l, HRBb.bb_pat) then
self.hrbb = HRBb:from_comment(l)
elseif self.bb then
break -- stop looking; we expect hrbb next to bb
end
if self.bb and self.hrbb then break end
end
if not self.bb then
errror('No valid boundingbox for generated file' .. self.path)
end
return self -- no real need for a return value
end
function PsPdf:bb_from_gs()
if self.type=='ps' then
errror('bb_from_gs called with ps file '..self.path)
-- not needed for generic PostScript,
-- page selection only works with pdf files, so we save ourselves
-- the trouble of picking the right bbox from a list
end
if self.type=='eps' and not self.bb:nonnegative() then
errror('bb_from_gs called on ' .. self.path ..
' which has some negative boundingbox coordinates')
-- any_to_any should guard against such an invocation
end
-- Since Ghostscript writes the boundingbox comments to stderr,
-- we need a shell to intercept this output:
local bb_file = mktemp('dsc')
-- a somewhat low resolution parameter may help gs
-- deal with eps files with large coordinates
-- but this may impact the accuracy of the HRBb
local cmdline
if self.type=='eps' and (self.bb.x2 > 850 or self.bb.y2 > 850) then
cmdline = gs_prog .. ' -r300 ' .. table.concat(gs_options,' ')
else
cmdline = gs_prog .. ' ' .. table.concat(gs_options,' ')
end
if self.type=='pdf' then
pg = options.page or 1
cmdline = cmdline .. ' -dFirstPage#' .. tostring(pg) ..
' -dLastPage#' .. tostring(pg)
end
cmdline = cmdline .. ' -sDEVICE#bbox ' .. self.path .. ' 2>'..bb_file
-- execute shell command
local r, cmd
write_log('os.execute: '..cmdline)
r = os.execute(cmdline)
if not r then
errror('Cannot get fixed boundingbox for '..self.path)
end
-- read new bbox from ghostscript output
-- can we really count on the plain bb coming first?
-- OTOH, I would rather not introduce unnecessary complexity
-- still, it may be better to match each line with [HR]Bb_pat
local bb = false
local hrbb = false
local fin = io.open(bb_file, 'r')
if fin then
for i=1,10 do -- actually, 2 should suffice
local l = fin:read("*line")
if not l then break end
if string.match(l, Bb.bb_pat) then
bb = Bb:from_comment(l)
end
if string.match(l, HRBb.bb_pat) then
hrbb = HRBb:from_comment(l)
end
end
fin:close()
end
if not bb or not hrbb then
errror('Cannot get fixed boundingbox for '..self.path)
end
return bb, hrbb
end
-- eps_clean: remove some problem features from eps (new file & object)
function PsPdf:eps_clean()
-- return a PsPdf object referring to a new file
-- without a preview header and with boundingbox(es) in the header.
-- return a new file even if no changes were needed.
local function bytes2num (s, i)
-- convert substring s[i..i+3] to a number.
-- by working byte for byte we avoid endian issues
local n = string.byte(s, i+3)
for j=2,0,-1 do n = 256*n + string.byte(s, i+j) end
return n
-- somehow the explicit expression below didn't work
-- return ((256 * (256 * (256 * string.byte(s,i+3)) + string.byte(s,i+2))
-- + string.byte(s,i+1)) + string.byte(s,i))
end
if self.type~='eps' and self.type~='epsPreview' then
errror('epsclean called with non-eps file ' .. self.path)
end
local offset, ps_length = false, false
local fin, fout
if self.type=='eps' then
offset = 0
ps_length = lfs.attributes(self.path, 'size')
else
-- read TOC; see Adobe EPS specification
-- interpret byte for byte, in case the platform is not little-endian
fin = io.open(self.path, 'rb')
if fin then
local toc = fin:read(12)
fin:close()
if toc and string.len(toc)==12 then
offset = bytes2num(toc, 5)
ps_length = bytes2num(toc, 9)
end
end
if not offset then
errror('Could not read preview header of ' .. self.path)
end
end
-- create the PsPdf object which is to be returned
local psp
psp = PsPdf:new('eps')
-- read an initial and if necessary a final chunk of the file
-- to find boundingbox comments.
local atend = false
local hr_atend = false
local slurp -- the read buffer
local l -- contains current scanned line; split off from slurp
-- pre_lines: scanned header lines; alternately lines and eols
local pre_lines = {}
-- new_offset: offset plus combined length of scanned header lines
local new_offset = offset
-- post_lines: scanned trailer lines
local post_lines = {}
-- middle_length: ps_length minus scanned header- and and maybe trailer parts
-- this is the length of file that will be copied wholesale.
local middle_length
local i, i_bb, i_hrbb
local j, j_bb, j_hrbb, j_end
-- j_end: index of final scanned trailer line
-- no i_end necessary: for header lines we can use #pre_lines.
fin = io.open(self.path, 'rb')
if not fin then errror('Cannot read '..self.path) end
fin:seek('set', offset)
-- remaining, unscanned length of input buffer slurp
local unscanned = math.min(ps_length,bufsize)
slurp = fin:read(unscanned)
-- unnecessary:
psp.bb = nil
psp.hrbb = nil
i, i_bb, i_hrbb = 0, false, false
while unscanned>0 do
i = i+1
if string.find(slurp,'[\n\r]')==1 then
l,slurp = string.match(slurp, '^([\n\r]+)(.*)$')
else
l,slurp = string.match(slurp, '^([^\n\r]+)(.*)$')
if string.match(l, Bb.bb_end) then
atend = true
i_bb = i
elseif string.match(l, Bb.bb_pat) then
psp.bb = Bb:from_comment(l)
-- from_comment errors out on failure; no need to check return value
i_bb = i
elseif string.match(l, HRBb.bb_end) then
hr_atend = true
i_hrbb = i
elseif string.match(l, HRBb.bb_pat) then
psp.hrbb = HRBb:from_comment(l)
i_hrbb = i
end -- bbox line
end -- eol/non-eol
pre_lines[i] = l
unscanned = unscanned - string.len(l)
if (i_bb and (i_hrbb or (i_bb<(i-1)))) or unscanned<=0 then
-- condition i_bb<i-1:
-- We do not want to find the hrbb of an included eps.
-- Therefore we stop looking for hrbb if it is not next to bb
-- (with an intervening eol)
-- Note that the header comments are not necessarily terminated
-- with a %%EndComments line; see Adobe DSC spec 5001
break
end -- deciding whether to stop
end -- while
new_offset = offset + string.len(table.concat(pre_lines))
middle_length = ps_length - string.len(table.concat(pre_lines))
if atend or hr_atend then
-- find boundingbox comments, starting from end of postscript
if ps_length>bufsize then
fin:seek('set',offset+ps_length-bufsize)
unscanned = bufsize
slurp = fin:read(unscanned)
else
-- use what is left from old slurp
unscanned = string.len(slurp)
end
j = 1 -- count down from 0
j_bb, j_hrbb, j_end = false, false, false
while unscanned>0 do
j = j - 1
if string.find(slurp,'[\n\r]', string.len(slurp)) then
slurp,l = string.match(slurp, '^(.-)([\n\r]+)$')
-- '-': non-greedy matching
else
slurp,l = string.match(slurp, '^(.-)([^\n\r]+)$')
if string.match(l, Bb.bb_pat) then
psp.bb = Bb:from_comment(l)
j_bb = j
elseif string.match(l, HRBb.bb_pat) then
psp.hrbb = HRBb:from_comment(l)
j_hrbb = j
end -- bbox line
end -- eol/non-eol
post_lines[j] = l
unscanned = unscanned - string.len(l)
if (psp.bb and
(psp.hrbb or not hr_atend or j_bb>(j+1))) or unscanned<=0 then
-- stop looking
j_end = j
break
end -- deciding whether to stop
end -- while
middle_length = middle_length -
string.len(table.concat(post_lines, '', j_end, 0))
end --if atend
fin:close()
-- fix boundingbox lines
if atend and j_bb then
-- pre_lines[i_bb] = post_lines[j_bb]
pre_lines[i_bb] = psp.bb:comment() -- WHY DOESNT THIS WORK ????
post_lines[j_bb] = ''
post_lines[j_bb+1] = ''
end
if hr_atend and j_hrbb then
-- pre_lines[i_hrbb] = post_lines[j_hrbb]
pre_lines[i_hrbb] = psp.hrbb:comment()
post_lines[j_hrbb] = ''
post_lines[j_hrbb+1] = ''
end
-- create cleaned eps file
fout = io.open(psp.path, 'wb')
if not fout then errror('Cannot create new file '..psp.path) end
fout:write(table.concat(pre_lines))
fout:close()
slice_file(self.path, psp.path, middle_length, new_offset, 'ab')
fout = io.open(psp.path, 'ab')
fout:write(table.concat(post_lines, '', j_end, 0))
fout:close()
return psp
end -- eps_clean
-- tight boundingbox (new file & object)
function PsPdf:eps_crop()
-- conversion is not done by an external program, although
-- we invoke Ghostscript with a bbox device for a tight boundingbox.
-- We use both the regular and the hires boundingbox from gs.
-- The eps should already have been cleaned up by eps_clean,
-- and the current boundingbox should not contain negative coordinates,
-- otherwise the bbox output device may give incorrect results.
-- Only the boundingbox in the eps is rewritten.
-- create the PsPdf object which is to be returned
local psp = PsPdf:new('eps')
-- read new bbox from ghostscript output
psp.bb, psp.hrbb = self:bb_from_gs()
-- rewrite header with new boundingboxes
local slurp -- the read buffer
local l -- contains current scanned line; split off from slurp
-- pre_lines: scanned header lines; alternately lines and eols
local pre_lines = {}
-- offset: combined length of scanned header lines
local offset = 0
local ps_length = lfs.attributes(self.path, 'size')
local i, i_bb, i_hrbb
fin = io.open(self.path, 'rb')
if not fin then errror('Cannot read '..self.path) end
-- remaining, unscanned length of input buffer slurp
local unscanned = math.min(ps_length,bufsize)
slurp = fin:read(unscanned)
i, i_bb, i_hrbb = 0, false, false
while unscanned>0 do
i = i+1
if string.find(slurp,'[\n\r]')==1 then
l,slurp = string.match(slurp, '^([\n\r]+)(.*)$')
else
l,slurp = string.match(slurp, '^([^\n\r]+)(.*)$')
if string.match(l, Bb.bb_pat) then
i_bb = i
elseif string.match(l, HRBb.bb_pat) then
i_hrbb = i
end -- bbox line
end -- eol/non-eol
pre_lines[i] = l
unscanned = unscanned - string.len(l)
if (i_bb and (i_hrbb or (i_bb<(i-1)))) or unscanned<=0 then
break
end
end -- while
fin:close()
offset = string.len(table.concat(pre_lines))
if i_hrbb then
pre_lines[i_bb] = psp.bb:comment()
pre_lines[i_hrbb] = psp.hrbb:comment()
else
-- jam both bbox comments into one slot, with an intervening eol.
-- for the sake of conformity, we copy an existing eol.
pre_lines[i_bb] = psp.bb:comment() .. pre_lines[i_bb-1] ..
psp.hrbb:comment()
end
-- write a new eps file
fout = io.open(psp.path, 'wb')
if not fout then errror('Cannot write new file '.. psp.path) end
fout:write(table.concat(pre_lines))
fout:close()
slice_file(self.path, psp.path,
lfs.attributes(self.path,'size') - offset, offset, 'ab')
options.bbox = false
return psp
end -- eps_crop
--[[
most of these conversions involve a single invocation of gs, pdftops or texlua
Each conversion fullfills all options that it can: gray, bbox and
page. gray when converting to pdf, bbox when converting from eps or
from pdf to pdf and page when converting from pdf. It then sets the
fullfilled option(s) to false.
We make sure to do the tight boundingbox before a file format downgrade:
rasterization of the page or graphic frustrates boundingbox calculation.
We like to preserve fonts as fonts. gs does this when generating
pdf, but may fail for fonts such as cid and large truetype when
generating PostScript. In such cases, pdftops may succeed. However,
it seems that if the page contains an element that does not cleanly
convert, pdftops simply rasterizes the entire page, and that this
choice is made per page.
--]]
-- Converting from pdf to pdf using luatex; no grayscaling here
function PsPdf:getpgbox()
if options.page and options.page > self.pages then
errror('PsPdf:getpgbox called with non-existent page '.. options.page)
end
local pg = options.page or 1
local bb, hrbb, pgbox, pdfdoc, ppage
if pdfe then
pdfdoc = pdfe.open(self.path)
if pdfdoc then
ppage = pdfe.getpage(pdfdoc, pg)
if not ppage then errror('did not get page') end
if ppage then
pgbox = pdfe.getbox(ppage, 'MediaBox')
if not pgbox then
pgbox = pdfe.getbox(ppage, 'CropBox')
if not pgbox then
pgbox = pdfe.getbox(ppage, 'TrimBox')
if not pgbox then
errror('No box acquired')
end
end
end
end
end
pdfe.close(pdfdoc)
else
local cat
pdfdoc = epdf.open(self.path)
if pdfdoc then
cat = pdfdoc:getCatalog()
if cat then
ppage = cat:getPage(pg)
if ppage then
pgbox = ppage:getMediaBox()
if not pgbox then
pgbox = ppage:getCropBox()
if not pgbox then
pgbox = ppage:getTrimBox()
end
end
end
end
end
end
-- normalization and further checks, including for non-nil,
-- by HRBb:from_rect, which errors out on failures
if pgbox then
pgbox = HRBb:from_rect(pgbox)
-- this also converts numeric array indices to x1 ... y2 if necessary
else
errror('Cannot get page box from '..self.path..' page '..pg)
end
return pgbox
end -- PsPdf:getpgbox
function PsPdf:pdf_crop()
-- options to be fulfilled: page, boundingbox if possible
-- embeds the pdf with boundingbox parameters into a new (lua)tex document
if options.page and options.page > self.pages then
errror('PsPdf:pdf_crop called with non-existent page '.. options.page)
end
local bb, hrbb, pgbox
pgbox = self:getpgbox()
if options.bbox and pgbox:nonnegative() then
bb, hrbb = self:bb_from_gs()
options.bbox = false
else
hrbb = pgbox
end
-- luatex is on searchpath
local luatex_prog = 'luatex'
-- write TeX file which includes cropped pdf page
-- adapted from Heiko Oberdiek's pdfcrop utility.
-- the table `pieces' will contain the component strings for the tex source
-- first, for texlua <= 0.81
local pieces = {}
if status.luatex_version <= 80 then
pieces[1] = '\\pdfoutput=1\n'
else
pieces[1] = [[
\edef\pdfminorversion {\pdfvariable minorversion}
\edef\pdfcompresslevel {\pdfvariable compresslevel}
\edef\pdfobjcompresslevel {\pdfvariable objcompresslevel}
\edef\pdfdecimaldigits {\pdfvariable decimaldigits}
\edef\pdfhorigin {\pdfvariable horigin}
\edef\pdfvorigin {\pdfvariable vorigin}
\let\pdfpagewidth\pagewidth
\let\pdfpageheight\pageheight
\let\pdfximage\saveimageresource
\let\pdfrefximage\useimageresource
\let\pdflastximage\lastsavedimageresourceindex
\outputmode=1
]]
end
if self.maver > 1 then
pieces[2] = '\\pdfminorversion=9\n'
else
pieces[2] = '\\pdfminorversion=' .. self.miver .. '\n'
end
if self.maver > 1 or self.miver > 4 then
pieces[3] = [[
\pdfcompresslevel=9
\pdfobjcompresslevel=2
\pdfdecimaldigits=4
]]
else
pieces[3] = [[
\pdfcompresslevel=9
\pdfobjcompresslevel=0
\pdfdecimaldigits=4
]]
end
pieces[4] = [[
\def\page #1 [#2 #3 #4 #5]{%
\count0=#1\relax
\setbox0=\hbox{%
\pdfximage page #1 mediabox{]]
pieces[5] = self.path
pieces[6] = [[}%
\pdfrefximage\pdflastximage
}%
\pdfhorigin=#2bp\relax
\pdfvorigin=#3bp\relax
\pagewidth=#4bp\relax
\pageheight=#5bp\relax
\ht0=\pageheight
\shipout\box0\relax
}
]]
pieces[7] = string.format([[
\page %d [%f %f %f %f]
\csname @@end\endcsname
\end
]],
options.page or 1, -hrbb.x1, hrbb.y1, hrbb.x2-hrbb.x1, hrbb.y2-hrbb.y1)
local textemp = mktemp('tex') -- this also took care of pdf:
local pdftemp = string.gsub(textemp, 'tex$', 'pdf')
-- if os.type=='windows' then waitasec() end
local f = io.open(textemp, 'w')
-- if os.type=='windows' then waitasec() end
f:write(table.concat(pieces, ''))
f:close()
local cmd, res, psp
-- if os.type=='unix' then
cmd = {luatex_prog, '--safer', '--no-shell-escape', textemp}
log_cmd(cmd)
res = os.spawn(cmd)
-- else
-- cmd = luatex_prog..' --safer --no-shell-escape '..textemp
-- log_cmd({cmd})
-- -- os.execute('timeout /t 1 /nobreak >nul')
-- res = os.execute(cmd)
-- end
if res and res==0 and lfs.attributes(pdftemp, 'size')>0 then
psp = PsPdf:from_path(pdftemp)
options.bbox = false
options.page = false
return psp
else
errror('pdf_crop failed on '..self.path)
end
end
function PsPdf:eps_to_pdf()
-- option to be fulfilled: gray
-- set target and maybe pdf version if applicable
if self.type~='eps' then
errror('PsPdf:eps_to_pdf called for non-eps file '.. self.path)
end
local cmd
maybe_add_version_parameter()
cmd = tab_combine({{gs_prog}, gs_options, pdf_options})
if options.gray then
cmd = tab_combine({cmd, gray_options})
end
table.insert(cmd, '-dEPSCrop') -- uses existing hires bb
local psp = PsPdf:new('pdf')
table.insert(cmd, '-sOutputFile#'..psp.path)
cmd = tab_combine({cmd, pdf_tail_options})
table.insert(cmd, self.path)
log_cmd(cmd)
local res = os.spawn(cmd)
if res and res==0 and lfs.attributes(psp.path, 'size')>0 then
psp.pages, psp.miver, psp.maver = pdf_props(psp.path)
options.gray = false
return psp
else
errror('eps_to_pdf failed on '..self.path)
end
end -- eps_to_pdf
-- Converting from pdf to pdf with grayscaling and/or page selection
-- or just eliminating negative boundingbox
function PsPdf:pdf_to_pdf()
-- option to be fulfilled: gray, optionally page
-- side effect: makes bbox non-negative.
-- do not call this just for page selection because
-- pdf_crop can do this in a less invasive manner
if self.type~='pdf' then
errror('PsPdf:pdf_to_pdf called for non-pdf file '.. self.path)
end
local cmd
if options.page and options.page > self.pages then
errror('PsPdf:pdf_to_pdf called with non-existent page '.. options.page)
end
cmd = tab_combine({{gs_prog}, gs_options, pdf_options})
if options.gray then
cmd = tab_combine({cmd, gray_options})
end
if options.page then
table.insert(cmd, '-dFirstPage#'..tostring(options.page))
table.insert(cmd, '-dLastPage#'..tostring(options.page))
end
maybe_add_version_parameter()
local psp = PsPdf:new('pdf')
table.insert(cmd, '-sOutputFile#'..psp.path)
cmd = tab_combine({cmd, pdf_tail_options})
table.insert(cmd, self.path)
log_cmd(cmd)
local res = os.spawn(cmd)
if res and res==0 and lfs.attributes(psp.path, 'size')>0 then
psp.pages, psp.miver, psp.maver = pdf_props(psp.path)
options.gray = false
options.page = false
return psp
else
errror('pdf_to_pdf failed on '..self.path)
end
end -- pdf_to_pdf
function PsPdf:pdf_to_eps()
-- options to be fulfilled: page
local psp = PsPdf:new('eps')
local cmd, res
-- any_to_any already checked the validity and relevance of options.page
if pdftops then
if options.page then
cmd = tab_combine({{pdftops}, ps_options,
{'-f', options.page, '-l', options.page,
'-eps', self.path, psp.path}})
else
cmd = tab_combine({{pdftops}, ps_options,
{'-eps', self.path, psp.path}})
end
log_cmd(cmd)
if os.type=='windows' then
-- suppress console output of 'No display font for...' messages,
-- which are usually harmless and for which I know no easy fix
-- pdftops -q does not do the trick on Windows,
-- and redirection to logfile gives access denied under miktex
-- res = os.spawn({'cmd', '/c', table.concat(cmd, ' ')..' 2>>'..log_bsl})
res = os.execute(table.concat(cmd, ' ')..' 2>nul')
else
res = os.spawn(cmd)
end
if res and res==0 and lfs.attributes(psp.path, 'size')>0 then
psp.pages = 1
options.page = false
else
errror('pdf_to_eps failed on '..self.path)
end
-- fix for incorrect DSC header produced by some versions of pdftops:
-- if necessary, change line `% Produced by ...' into `%%Produced by ...'
-- this is usually the second line.
-- otherwise the DSC header would be terminated before the bbox comment.
-- this problem exists with pdftops from TL2011/w32.
local slurp -- input buffer
local fin = io.open(psp.path, 'rb')
if not fin then errror('Cannot read '..psp.path) end
-- remaining, unscanned length of input buffer slurp
local unscanned = math.min(lfs.attributes(psp.path, 'size'),bufsize)
slurp = fin:read(unscanned)
local i, i_bb = 0, false
local needs_fixing = false
local pre_lines = {}
local offset = 0
while unscanned>0 do
i = i+1
if string.find(slurp,'[\n\r]')==1 then
l,slurp = string.match(slurp, '^([\n\r]+)(.*)$')
else
l,slurp = string.match(slurp, '^([^\n\r]+)(.*)$')
if string.match(l, Bb.bb_pat) then
-- bbox line
i_bb = i
elseif string.match(l, '^%%%s') then -- `%' is escape char: doubled
-- %X with X printable would be ok
needs_fixing = true
-- fix rightaway
l = string.gsub(l, '^%%%s', '%%%%') -- same length
end
end -- eol/non-eol
pre_lines[i] = l
unscanned = unscanned - string.len(l)
offset = offset + string.len(l)
if i_bb then break end
end -- while
fin:close()
if needs_fixing then
-- write a new eps file
local newfile = mktemp('eps')
fout = io.open(newfile, 'wb')
if not fout then errror('Cannot write new file '.. newfile) end
fout:write(table.concat(pre_lines))
fout:close()
slice_file(psp.path, newfile,
lfs.attributes(psp.path,'size') - offset, offset, 'ab')
psp.path = newfile
end -- needs_fixing
else -- use ghostscript
local epsdev = gs_epsdevice()
if not epsdev then
errror('Conversion to eps not supported by this ghostscript')
end
cmd = tab_combine({{gs_prog}, gs_options,
{'-sDEVICE#'..epsdev, '-dHaveTrueTypes=true', '-dLanguageLevel#3'}})
if options.gray then
cmd = tab_combine({cmd, gray_options})
end
if options.page then
table.insert(cmd, '-dFirstPage='..options.page)
table.insert(cmd, '-dLastPage='..options.page)
end
table.insert(cmd, '-sOutputFile='..psp.path)
table.insert(cmd, self.path)
log_cmd(cmd)
res = os.spawn(cmd)
if res and res==0 and lfs.attributes(psp.path, 'size')>0 then
psp.pages = 1
options.page = false
options.gray = false
else
errror('pdf_to_eps failed on '..self.path)
end
end -- use ghostscript
psp:get_bb_simple()
return psp
end -- pdf_to_eps
function PsPdf:ps_to_pdf()
-- options to be fulfilled: gray
if self.type~='ps' then
errror('PsPdf:ps_to_pdf called for non-ps file '.. self.path)
end
local cmd
cmd = tab_combine({{gs_prog}, gs_options, pdf_options})
if options.gray then
cmd = tab_combine({cmd, gray_options})
end
local psp = PsPdf:new('pdf')
table.insert(cmd, '-sOutputFile#'..psp.path)
cmd = tab_combine({cmd, pdf_tail_options})
table.insert(cmd, self.path)
log_cmd(cmd)
local res = os.spawn(cmd)
if res and res==0 and lfs.attributes(psp.path, 'size')>0 then
psp.pages, psp.miver, psp.maver = pdf_props(psp.path)
options.gray = false
return psp
else
errror('ps_to_pdf failed on '..self.path)
end
end -- PsPdf:ps_to_pdf
function PsPdf:pdf_to_ps()
-- options to be fulfilled: page and, if not using pdftops, also gray
local psp = PsPdf:new('ps')
-- options.page checked by any_to_any
psp.pages = self.pages
local cmd, res
if pdftops then
cmd = tab_combine({{pdftops}, ps_options})
if options.page then
cmd = tab_combine({cmd, {'-f', options.page, '-l', options.page}})
end
cmd = tab_combine({cmd, {'-paper', 'match', self.path, psp.path}})
else -- use ghostscript
cmd = tab_combine({{gs_prog}, gs_options,
{'-sDEVICE#ps2write', '-dHaveTrueTypes=true', '-dLanguageLevel#3'}})
if options.gray then
cmd = tab_combine({cmd, gray_options})
end
if options.page then
cmd = tab_combine({cmd,
{'-dFirstPage#'..options.page, '-dLastPage#'..options.page}})
end
table.insert(cmd, '-sOutputFile#'..psp.path)
table.insert(cmd, self.path)
end
log_cmd(cmd)
if os.type=='windows' and pdftops then
-- suppress console output of 'No display font for...' messages,
-- which are usually harmless and for which I know no easy fix
-- pdftops -q does not do the trick on Windows,
-- and redirection to logfile gives access denied under miktex
-- res = os.spawn({'cmd', '/c', table.concat(cmd, ' ')..' 2>>'..log_bsl})
res = os.execute(table.concat(cmd, ' ')..' 2>nul')
else
res = os.spawn(cmd)
end
if res and res==0 and lfs.attributes(psp.path, 'size')>0 then
options.page = false
-- gs will have grayscaled if requested but pdftops will not
if not pdftops then options.gray = false end
return psp
else
errror('pdf_to_ps failed on '..self.path)
end
end -- PsPdf:pdf_to_ps
function PsPdf:ps_to_ps()
-- we do not accept a page option since we do not know
-- which pages are available.
-- if no gray option then there is no point in invoking this function.
local psp = PsPdf:new('ps')
local cmd = tab_combine({{gs_prog}, gs_options,
{'-sDEVICE#ps2write', '-dHaveTrueTypes=true', '-dLanguageLevel#3'}})
if options.gray then
cmd = tab_combine({cmd, gray_options})
end
table.insert(cmd, '-sOutputFile#'..psp.path)
table.insert(cmd, self.path)
log_cmd(cmd)
local res = os.spawn(cmd)
if res and res==0 and lfs.attributes(psp.path, 'size')>0 then
options.gray = false
return psp
else
errror('ps_to_ps failed on '..self.path)
end
end -- PsPdf:ps_to_ps
function any_to_any()
local psp = PsPdf:from_path(infile)
-- sanitize some options
if options.type=='ps' then
options.bbox = false
end
if (options.bbox or options.type=='eps') and not options.page then
options.page = 1
end
if psp.type=='pdf' then
if options.page then
local pgs = pdf_props(infile)
if pgs<options.page then
errror(infile..' has only '..pgs..' page(s).')
elseif pgs==1 then
options.page = false
end
end
elseif psp.type=='eps' then
options.page = false
end
-- psp.type=='ps': pages not yet known but maybe not needed
local do_something = false
if psp.type=='eps' then
do_something = true -- do at least cleanup
elseif psp.type~=options.type then
do_something = true
elseif options.page then
do_something = true
elseif options.bbox then
do_something = true
elseif options.gray then
do_something = true
elseif options.type=='pdf' then
if psp:to_downgrade() then
do_something = true
elseif settings.pdf_target and settings.pdf_target~=default then
do_something = true
end
end
if not do_something then
if infile~=outfile then
slice_file(infile, outfile)
end
return true
end
-- `distiller' settings
-- these depend on whether final output is pdf
if options.type=='pdf' then
if settings.pdf_target and (settings.pdf_target~='default') then
table.insert(pdf_options, '-dPDFSETTINGS#/'..settings.pdf_target)
end
if settings.pdf_target~='screen' and settings.pdf_target~='ebook' then
pdf_tail_options = {
'-c', '<</NeverEmbed [ ] >> setdistillerparams', '-f'}
end
end
--[[ Actual conversions
each single-step conversion takes care of options it can handle
and sets those options to false.
Cropping a pdf is best be done before converting to postscript or
a low (<1.4) pdf version.
all invocations of external programs work on temporary files
in the then-current temporary directory, with a simple generated
filename. So no need to quote names of input- or output filenames.
--]]
local newfile
if psp.type=='eps' or psp.type=='epsPreview' then
-- As a side effect of eps_clean, the modified or unmodified source file
-- is copied to our temp subdirectory.
-- We always create a new file.
psp = psp:eps_clean()
if options.bbox and psp.bb:nonnegative() then
psp = psp:eps_crop()
end
if options.type=='eps' then
if options.gray or options.bbox then
-- bbox: eps_crop was apparently not applicable: pdf roundtrip
psp = psp:eps_to_pdf()
if options.bbox then
psp = psp:pdf_crop()
end
psp = psp:pdf_to_eps()
end
elseif options.type=='pdf' then
psp = psp:eps_to_pdf()
if options.bbox then
psp = psp:pdf_crop()
end
if psp:to_downgrade() then
maybe_add_version_parameter()
psp = psp:pdf_to_pdf()
end
elseif options.type=='ps' then
-- often, the eps file is fine as a postscript file.
-- however, it may lack a showpage operator, or have a weird
-- boundingbox. converting back-and-forth to pdf solves both problems.
-- eps_to_pdf will take care of grayscaling
-- a tight boundingbox option is not supported for ps output.
psp = psp:eps_to_pdf():pdf_to_ps()
end
slice_file(psp.path, outfile)
return true
elseif psp.type=='ps' then
-- preliminary:
-- copy infile to a file in the temp directory, needed for gs -dSAFER
newfile = mktemp(psp.type)
slice_file(psp.path, newfile)
psp.path = newfile
if options.type=='ps' and not options.page then
psp = psp:ps_to_ps()
slice_file(psp.path, outfile)
return true
end
-- remaining options require initial conversion to pdf
psp = psp:ps_to_pdf()
-- AFAIK, all high-level ps constructs are covered by any pdf version
-- so this option should not cause unnecessary loss of structure
maybe_add_version_parameter()
if options.page and options.page>1 then
-- could not check page option before
local pgs = pdf_props(psp.path)
if pgs<options.page then
errror(infile..' has only '..pgs..' page(s).')
elseif pgs==1 then
options.page = false
end
end
-- actual conversion
if options.type=='eps' then
if options.bbox then
psp = psp:pdf_crop()
end
psp = psp:pdf_to_eps()
elseif options.type=='pdf' then
if options.bbox or options.page then
psp = psp:pdf_crop()
-- else no action needed
end
elseif options.type=='ps' then
psp = psp:pdf_to_ps()
end -- pdf => ps
slice_file(psp.path, outfile)
return true
elseif psp.type=='pdf' then
if options.type=='pdf' and settings.pdf_target=='default' and
not options.gray and not options.bbox and not options.page and
not psp:to_downgrade() then
if infile~=outfile then
slice_file(infile, outfile)
end
return true
end
-- preliminary:
-- copy infile to a file in the temp directory, needed for gs -dSAFER
newfile = mktemp(psp.type)
slice_file(psp.path, newfile)
psp = PsPdf:from_path(newfile)
local pgbox
-- actual conversion
if options.type=='eps' then
if options.bbox then
pgbox = psp:getpgbox() -- page n. available from options table
if not pgbox:nonnegative() or options.gray then
-- fix in extra pdf-to-pdf step
psp = psp:pdf_to_pdf()
end
-- we want to calculate a tight boundingbox before conversion to eps,
-- because this conversion may cause rasterization and baffle
-- gs' boundingbox calculations
psp = psp:pdf_crop()
elseif options.gray and pdftops then
psp = psp:pdf_to_pdf()
end
psp = psp:pdf_to_eps()
elseif options.type=='pdf' then
-- pdf_crop can take care of bbox and page,
-- but not of gray and not of some pdf options
if options.bbox then
pgbox = psp:getpgbox()
if not pgbox:nonnegative() then
-- pdf_to_pdf fixes negative bbox parameters
-- and also takes care of page and gray
psp = psp:pdf_to_pdf()
end
psp = psp:pdf_crop()
end
need_gs = false
if psp:to_downgrade() then
need_gs = true
maybe_add_version_parameter()
end
if settings.pdf_target~='default' then
need_gs = true
end
if options.gray then
need_gs = true
end
if (not need_gs) and options.page then
psp = psp:pdf_crop()
-- less invasive that page selection by gs
end
if need_gs then
psp = psp:pdf_to_pdf() -- will handle page selection too
end
elseif options.type=='ps' then
if options.gray and pdftops then
psp = psp:pdf_to_pdf():pdf_to_ps()
else
psp = psp:pdf_to_ps()
end
end -- pdf => ps
slice_file(psp.path, outfile)
return true
end
end -- any_to_any
-- system-dependent initialization -----------------------------------
-- current directory, at program start
cwd = lfs.currentdir()
if os.type == 'windows' then cwd = string.gsub(cwd, '\\', '/') end
-- child searchpath initially set to parent searchpath
-- childpath = os.getenv('PATH')
-- prepend (lua)tex directory to searchpath, if not already there
maybe_add_path(os.selfdir, false)
-- Windows: miktex, TL or neither. is_miktex, is_tl_w32
-- no support yet for separate ghostscript
is_miktex = false
is_tl_w32 = false
if os.type == 'windows' then
if string.find (string.lower(kpse.version()), 'miktex') then
is_miktex = true
else
local rt = string.gsub(os.selfdir,'[\\/][^\\/]+[\\/][^\\/]+$', '')
if not rt then
errror('Unrecognized TeX directory structure', 0)
elseif lfs.isfile(rt..'/release-texlive.txt') then
--[[
-- TL version is easy to determine but is not needed
local fin = io:open(rt..'release-texlive.txt', 'r')
if fin then
local l = fin:read('*line')
tl_ver = string.match(l, 'version%s+(%d+)$')
if tl_ver then tl_ver = tonumber(tl_ver) end
end -- if fin
--]]
is_tl_w32 = true
else
errror('Not MikTeX and no file ' .. rt ..
'/release-texlive.txt; TeX installation not supported.', 0)
end -- if isfile
end -- if not miktex
end -- if windows
-- without Ghostscript we are dead in the water.
gs_prog = false
do
local rt=''
if os.type == 'unix' then
if find_on_path('gs') then
gs_prog = 'gs'
else
error('No ghostscript on searchpath!', 0)
end
elseif is_miktex then
gs_prog = 'mgs.exe'
-- neither MiKTeX's nor TL's ghostscript need GS_LIB to be set
elseif is_tl_w32 then
-- windows/TeX Live
-- grandparent of texlua.exe directory .. ...
-- rt = string.gsub(os.selfdir,'[\\/][^\\/]+[\\/][^\\/]+$', '')
-- ..'/tlpkg/tlgs'
-- maybe_add_path(rt..'/bin', false)
-- -- gs_prog = 'gswin32c.exe'
-- ---[[ problems with (at least) grayscaling
gs_prog = 'rungs.exe'
--]]
else
errror('Only TeX Live and MikTeX supported!', 0)
end
end -- do
-- directory for configuration and log
epsdir = ''
if os.type == 'windows' then
epsdir = fw(os.getenv('APPDATA')) .. '/epspdf'
else
epsdir = os.getenv('HOME')..'/.epspdf'
end
rcfile = epsdir .. '/config'
logfile = epsdir .. '/epspdf.log'
-- create epsdir if necessary
if lfs.isfile(epsdir) then
error('Cannot continue; epspdf directory ' .. epsdir .. ' is a file')
elseif not lfs.isdir(epsdir) then
if not lfs.mkdir(epsdir) then
error('Failed to create epspdf directory ' .. epsdir)
end
end
-- start logging ---------------------------------
-- log rotate if logfile too big
if lfs.attributes(logfile) and lfs.attributes(logfile).size > 100000 then
local oldlog = logfile .. '.old'
if lfs.attributes(oldlog) then
if os.remove(oldlog) then os.rename(logfile,oldlog) end
elseif lfs.attributes(logfile) then do
-- separate epsdir runs with empty lines
print_log('\n\nNew run')
end end -- do elseif
end -- if lfs...logfile
write_log('epspdf '..table.concat(arg, ' '))
--[[
settings, initial values
priority, from low to high:
- built-in defaults
- settings read from and written to the configuration file
- command-line options, defined in the opts table
The options- and settings tables are initialized from built-in
defaults. We go for false rather than undefined, because this
results in an actual settings- or options entry.
Command-line options are copied to either options or settings.
We ignore illegal settings in the config file.
--]]
pdf_targets = {'screen', 'ebook', 'printer', 'prepress', 'default'}
pdf_versions = {'1.2', '1.3', '1.4', '1.5', '1.6', '1.7', 'default'}
-- ghostscript will substitute higher versions with
-- the highest-supported version
settings = {}
descriptions = {}
settings.pdf_target = 'default'
descriptions.pdf_target = 'One of ' .. join(pdf_targets, ', ', ' or ')
settings.pdf_version = 'default'
descriptions.pdf_version = 'One of ' .. join(pdf_versions, ', ', ' or ')
settings.use_pdftops = true
descriptions.use_pdftops = 'Use pdftops if available'
-- epspdf stores ps- and pdf viewer settings on behalf of the gui interface
-- but does not use them itself.
-- They will not be used at all under macos or windows.
settings.ps_viewer = false
descriptions.ps_viewer =
'Epspdftk: viewer for PostScript files; not used on Windows or Mac OS'
settings.pdf_viewer = false
descriptions.pdf_viewer =
'Epspdftk: viewer for pdf files; not used on Windows or Mac OS'
-- default_dir, which is used on all platforms, is only for the gui.
if os.type == 'windows' then
settings.default_dir =
string.gsub(os.getenv('USERPROFILE'), '\\', '/')
else
settings.default_dir = os.getenv('HOME')
end
descriptions.default_dir =
'Epspdftk: initial directory; ignored by epspdf itself'
-- options -------------------------------------
-- besides settings, which can be saved, we also use options which are not.
-- these are mostly conversion options.
options = {}
options.page = false
options.gray = false
options.bbox = false
options.debug = false
options.type = false -- implied via output filename on command line
-- command-line fragments for conversions --------------------
-- We could make these `class attributes' for PsPdf but to what purpose?
-- For Windows shell commands, we need to substitute `#' for `='
-- when invoking Ghostscript. For simplicity, we do this across the board.
-- -P- : do not look first in current directory
gs_options = {'-q', '-dNOPAUSE', '-dBATCH', '-P-', '-dSAFER'}
-- may add custom options later
pdf_options = {'-sDEVICE#pdfwrite'} -- '-dUseCIEColor' causes serious slowdown
-- options for final conversion to pdf;
-- will be completed after reading settings and options
-- -f ensures that the input filename is not added to a -c string
pdf_tail_options = {'-f'}
gray_options = {'-dProcessColorModel#/DeviceGray',
'-sColorConversionStrategy#Gray'}
pdftops = false
-- gets a value only if we are going to use pdftops
ps_options = {'-level3'}
-- `main program' inside scope-creating block ----------------------
do -- main program
local in_dir = false -- directory of infile
local out_dir = false -- directory of outfile
do -- Handle settings and command-line inside nested scope --------------
read_settings(rcfile)
local opts = {}
opts.page = {
type = 'string', val = nil,
forms = {'-p', '--page', '--pagenumber'},
placeholder = 'PNUM',
negforms = nil,
help = 'Page number; must be a positive integer'
}
opts.gray = {
type = 'boolean', val = nil,
forms = {'-g', '--grey', '--gray', '-G', '--GREY', '--GRAY'},
negforms = nil,
help = 'Convert to grayscale'
}
opts.bbox = {
type = 'boolean', val = nil,
forms = {'-b', '--bbox', '--BoundingBox'},
negforms = nil,
help = 'Compute tight boundingbox'
}
---[[ ignored; included for backward compatibility
opts.use_hires_bb = {
type = 'boolean', val = nil,
forms = {'-r', '--hires'},
negforms = {'-n', '--no-hires'},
}
opts.custom = {
type = 'string', val = nil,
forms = {'-C', '--custom', '-P', '--psoptions'},
negforms = nil
}
--]]
opts.pdf_target = {
type = 'string', val = nil,
forms = {'-T', '--target'},
placeholder = 'TARGET',
negforms = nil,
help = descriptions.pdf_target
}
opts.pdf_version = {
type = 'string', val = nil,
forms = {'-N', '--pdfversion'},
placeholder = 'VERSION',
negforms = nil,
help = descriptions.pdf_version
}
opts.use_pdftops = {
type = 'boolean', val = nil,
forms = {'-U'},
negforms = {'-I'},
help = descriptions.use_pdftops
}
opts.info = {
type = 'boolean', val = nil,
forms = {'-i', '--info'},
negforms = nil,
help = 'Info: display detected filetype and exit'
}
opts.help = {
type = 'boolean', val = nil,
forms = {'-h', '--help'},
negforms = nil,
help = 'Display this help message and exit'
}
opts.version = {
type = 'boolean', val = nil,
forms = {'-v', '--version'},
negforms = nil,
help = 'Display version info and exit'
}
opts.save = {
type = 'boolean', val = nil,
forms = {'-s', '--save'},
negforms = nil,
help = 'Save some settings to configuration file'
}
opts.debug = {
type = 'boolean', val = nil,
forms = {'-d'},
negforms = nil,
help = 'Debug: do not remove temp files'
}
opts.gui = {
type = 'string', val = nil,
forms = {'--gui'},
negforms = nil,
help = nil -- reserved for use by epspdftk
}
-- a couple of functions only available during command-line parsing
local function show_version ()
print('Epspdf version 0.6.4\nCopyright (c) 2006-2019 Siep Kroonenberg')
end
local function help (mess) -- requires opts array
if mess then
print(mess..eol)
end
show_version()
-- below, string.gsub unindents its long-string parameter.
-- string.format removes the second return value of string.gsub.
print( -- string.format('%s',
string.gsub([[
Convert between [e]ps and pdf formats
Usage: epspdf[.tlu] [options] infile [outfile]
Default for outfile is file.pdf if infile is file.eps or file.ps
Default for outfile is file.eps if infile is file.pdf
]], '([\r\n]+) ', '%1')) --)
-- need to enforce an ordering, otherwise we could have used pairs(opts)
-- omitted below: no-op options
-- one line where possible
local indent_n = 12
local intent_sp = string.rep(' ', indent_n)
local indent_fmt = '%-' .. tostring(indent_n) .. 's'
for _, o in ipairs({'page', 'gray', 'bbox', 'pdf_target', 'pdf_version',
'use_pdftops', 'save', 'info', 'debug', 'version', 'help'}) do
local v = opts[o]
if v and v.help then
local synt = join(v.forms, ', ')
if v.type ~= 'boolean' then synt = synt .. ' ' .. v.placeholder end
if string.len(synt)<indent_n then
print(string.format(indent_fmt, synt) .. v.help)
else
print(synt)
print(intent_sp .. v.help)
end
if v.negforms then
local neghelp = 'Reverses the above'
synt = join(v.negforms, ', ')
if string.len(synt)<indent_n then
print(string.format(indent_fmt, synt) .. neghelp)
else
print(synt)
print(intent_sp .. neghelp)
end
end
end
end -- for
if mess then os.exit(1) else os.exit() end
end -- help
if #arg < 1 then help('No parameters') end
-- command-line parsing
-- -r="tata tata" is parsed by [tex]lua as a single argument
-- lua/linux retains the quotes,
-- lua/windows strips them.
-- texlua strips them, both on unix and on windows.
local i=1
while i<=#arg and string.sub(arg[i],1,1)=='-' do
local parsed = false
local kk, vv = string.match(arg[i],'([^=]+)=(.*)$')
if kk==nil then
kk = arg[i] -- also vv==nil
else
vv = strip_outer_spaces(vv)
end
for p, o in pairs(opts) do
if in_list(kk, o.forms) or in_list(kk, o.negforms) then
parsed = true
if o.type == 'boolean' then
if vv then help(kk..' should not have a parameter.') end
if in_list(kk, o.forms) then
o.val = true
else
o.val = false
end
elseif vv then
o.val = vv
else
i = i + 1
if i>#arg then
help('Missing parameter to '..kk)
end
o.val = strip_outer_spaces(arg[i])
end -- testing for o.type or vv
break -- for
end -- if in_list
end -- for
if not parsed then help('illegal parameter '..kk) end
i = i + 1
end -- while
-- check and interpret opts.
-- Copy to either settings or to options table.
-- at syntax error, abort via help function.
-- page
if opts.page.val then
local pnum = tonumber(opts.page.val)
if pnum<=0 or math.floor(pnum) ~= pnum then
help(opts.page.val..' not a positive integer')
else
options.page = pnum
end
end
-- grayscaling
if opts.gray.val then
options.gray = true
else
options.gray = false
end
-- boundingbox
if opts.bbox.val then
options.bbox = true
else
options.bbox = false
end
--[[
-- using hires boundingbox
if opts.use_hires_bb.val~=nil then
settings.use_hires_bb = opts.use_hires_bb.val
end
--]]
-- using pdftops
if opts.use_pdftops.val~=nil then
settings.use_pdftops = opts.use_pdftops.val
end
-- pdf target use
if opts.pdf_target.val~=nil then
if in_list(opts.pdf_target.val, pdf_targets) then
settings.pdf_target = opts.pdf_target.val
else
help('Illegal value '..opts.pdf_target.val..' for pdf_target')
end
end
-- pdf version
if opts.pdf_version.val~=nil then
if in_list(opts.pdf_version.val, pdf_versions) then
settings.pdf_version = opts.pdf_version.val
else
help('Illegal value '..opts.pdf_version.val..' for pdf_version')
end
end
-- pdftops should be on the path
if settings.use_pdftops then
if os.type=='windows' then
pdftops = find_on_path('pdftops.exe')
else
pdftops = find_on_path('pdftops')
end
end
-- other options
if opts.save.val then
write_settings(rcfile)
end
if opts.debug.val then
options.debug = true
end
if opts.help.val then
help()
end
-- opts.info.val: do later; need to get infile first
if opts.version.val then
show_version()
os.exit()
end
if opts.gui.val then
gui(opts.gui.val)
end
-- now we need 1 or 2 filenames, unless the user really only
-- wanted to save options without further action.
if i>#arg then
if opts.save.val then os.exit() else help('No filenames') end
end
infile = arg[i]
outfile = false
if i<#arg then
outfile = arg[i+1]
end
if (#arg>i and opts.info.val) or (#arg>i+1) then
help('Surplus non-option parameters')
end
if not outfile and not opts.info.val then
-- derive outfile from infile: [e]ps => pdf, pdf => eps
if intype=='pdf' then
outfile = string.gsub(infile,'%.[^%.]*$','eps')
else
outfile = string.gsub(infile,'%.[^%.]*$','.pdf')
end
end
-- one final quick option
if opts.info.val then
info()
end
end -- do (decoding command-line)
--[[
Once it becomes clear that real work needs to be done,
we shall create a temp directory.
because of gs -dSAFER restrictions, infile must be in (a
subdirectory of) the directory of the output file, e.g. in the
temp directory. So we copy infile to the temp directory.
--]]
if not lfs.isfile(infile) or lfs.attributes(infile, 'size')==0 then
errror(infile..' does not exist or is empty.')
end
infile, in_dir = absolute_path(infile)
outfile, out_dir = absolute_path(outfile)
if not out_dir then
errror('Invalid output directory for '.. outfile)
end
-- directory for temporary files
-- previously, we used a subdirectory of the target directory.
-- however, since under windows cleanup may fail, we now try to use
-- a directory under a dedicated temp directory, which has a better chance
-- of getting cleaned up by the system.
lfs.chdir(system_tempdir() or out_dir)
-- no check for failure; we create a subdirectory in
-- whatever is the current directory
tempdir = os.tmpdir()
if not tempdir then
errror('Cannot create directory for temporary files')
end
lfs.chdir(tempdir)
-- determine filetype from first few bytes of file
intype = identify(infile)
-- remaining cases: want a real conversion
if not intype then
errror(infile..' has an unsupported filetype')
end
-- valid output filetype?
options.type = string.match(outfile, '.*%.([^%.]+)$')
if not options.type or (options.type~='ps' and
options.type~='eps' and options.type~='pdf') then
errror('Output file '..outfile..
' should have extension .eps, .ps or .pdf')
end
if outfile==infile then
slice_file(infile, infile..'.backup')
-- copy, not move, since outfile may be infile if there was nothing to do
end
result = any_to_any(infile, outfile)
if not lfs.isfile(outfile) or lfs.attributes(outfile, 'size')==0 then
errror('Failed to generate '..outfile)
end
if not options.debug then
cleantemp()
end
end