mirror of
https://git.lyx.org/repos/lyx.git
synced 2024-11-25 19:07:45 +00:00
c302740b9b
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@10468 a592a061-630c-0410-9148-cb99ea01b6c8
194 lines
6.0 KiB
Python
Executable File
194 lines
6.0 KiB
Python
Executable File
#! /usr/bin/env python
|
|
# -*- coding: iso-8859-1 -*-
|
|
|
|
# file lyxpreview2bitmap.py
|
|
# This file is part of LyX, the document processor.
|
|
# Licence details can be found in the file COPYING.
|
|
|
|
# author Angus Leeming
|
|
# with much advice from members of the preview-latex project:
|
|
# David Kastrup, dak@gnu.org and
|
|
# Jan-Åke Larsson, jalar@mai.liu.se.
|
|
|
|
# Full author contact details are available in file CREDITS
|
|
|
|
# This script takes a LaTeX file and generates a collection of
|
|
# png or ppm image files, one per previewed snippet.
|
|
|
|
# Pre-requisites:
|
|
# * A latex executable;
|
|
# * preview.sty;
|
|
# * dvipng;
|
|
# * pngtoppm (if outputing ppm format images).
|
|
|
|
# preview.sty and dvipng are part of the preview-latex project
|
|
# http://preview-latex.sourceforge.net/
|
|
|
|
# preview.sty can alternatively be obtained from
|
|
# CTAN/support/preview-latex/
|
|
|
|
# Example usage:
|
|
# lyxpreview2bitmap.py png 0lyxpreview.tex 128 000000 faf0e6
|
|
|
|
# This script takes five arguments:
|
|
# FORMAT: The desired output format. Either 'png' or 'ppm'.
|
|
# TEXFILE: the name of the .tex file to be converted.
|
|
# DPI: a scale factor, used to ascertain the resolution of the
|
|
# generated image which is then passed to gs.
|
|
# FG_COLOR: the foreground color as a hexadecimal string, eg '000000'.
|
|
# BG_COLOR: the background color as a hexadecimal string, eg 'faf0e6'.
|
|
|
|
# Decomposing TEXFILE's name as DIR/BASE.tex, this script will,
|
|
# if executed successfully, leave in DIR:
|
|
# * a (possibly large) number of image files with names
|
|
# like BASE[0-9]+.png
|
|
# * a file BASE.metrics, containing info needed by LyX to position
|
|
# the images correctly on the screen.
|
|
|
|
import glob, os, re, string, sys
|
|
|
|
from legacy_lyxpreview2ppm import legacy_conversion
|
|
|
|
from lyxpreview_tools import error, find_exe, \
|
|
find_exe_or_terminate, run_command
|
|
|
|
|
|
# Pre-compiled regular expressions.
|
|
hexcolor_re = re.compile("^[0-9a-fA-F]{6}$")
|
|
latex_file_re = re.compile("\.tex$")
|
|
|
|
|
|
def usage(prog_name):
|
|
return "Usage: %s <format> <latex file> <dpi> <fg color> <bg color>\n"\
|
|
"\twhere the colors are hexadecimal strings, eg 'faf0e6'"\
|
|
% prog_name
|
|
|
|
|
|
def make_texcolor(hexcolor):
|
|
# Test that the input string contains 6 hexadecimal chars.
|
|
if not hexcolor_re.match(hexcolor):
|
|
error("Cannot convert color '%s'" % hexcolor)
|
|
|
|
red = float(string.atoi(hexcolor[0:2], 16)) / 255.0
|
|
green = float(string.atoi(hexcolor[2:4], 16)) / 255.0
|
|
blue = float(string.atoi(hexcolor[4:6], 16)) / 255.0
|
|
|
|
return "rgb %f %f %f" % (red, green, blue)
|
|
|
|
|
|
def extract_metrics_info(dvipng_stdout, metrics_file):
|
|
metrics = open(metrics_file, 'w')
|
|
metrics_re = re.compile("\[([0-9]+) depth=(-?[0-9]+) height=(-?[0-9]+)")
|
|
|
|
success = 0
|
|
pos = 0
|
|
while 1:
|
|
match = metrics_re.search(dvipng_stdout, pos)
|
|
if match == None:
|
|
break
|
|
success = 1
|
|
|
|
# Calculate the 'ascent fraction'.
|
|
descent = string.atof(match.group(2))
|
|
ascent = string.atof(match.group(3))
|
|
|
|
frac = 0.5
|
|
if ascent > 0 and descent > 0:
|
|
if abs(ascent + descent) > 0.1:
|
|
frac = ascent / (ascent + descent)
|
|
|
|
# Sanity check
|
|
if frac < 0 or frac > 1:
|
|
frac = 0.5
|
|
|
|
metrics.write("Snippet %s %f\n" % (match.group(1), frac))
|
|
pos = match.end(3) + 2
|
|
|
|
return success
|
|
|
|
|
|
def convert_to_ppm_format(pngtopnm, basename):
|
|
png_file_re = re.compile("\.png$")
|
|
|
|
for png_file in glob.glob("%s*.png" % basename):
|
|
ppm_file = png_file_re.sub(".ppm", png_file)
|
|
|
|
p2p_cmd = '%s "%s"' % (pngtopnm, png_file)
|
|
p2p_status, p2p_stdout = run_command(p2p_cmd)
|
|
if p2p_status != None:
|
|
error("Unable to convert %s to ppm format" % png_file)
|
|
|
|
ppm = open(ppm_file, 'w')
|
|
ppm.write(p2p_stdout)
|
|
os.remove(png_file)
|
|
|
|
|
|
def main(argv):
|
|
# Parse and manipulate the command line arguments.
|
|
if len(argv) != 6:
|
|
error(usage(argv[0]))
|
|
|
|
output_format = string.lower(argv[1])
|
|
|
|
dir, latex_file = os.path.split(argv[2])
|
|
if len(dir) != 0:
|
|
os.chdir(dir)
|
|
|
|
dpi = string.atoi(argv[3])
|
|
fg_color = make_texcolor(argv[4])
|
|
bg_color = make_texcolor(argv[5])
|
|
|
|
# External programs used by the script.
|
|
path = string.split(os.environ["PATH"], os.pathsep)
|
|
latex = find_exe_or_terminate(["pplatex", "latex2e", "latex"], path)
|
|
|
|
# This can go once dvipng becomes widespread.
|
|
dvipng = find_exe(["dvipng"], path)
|
|
if dvipng == None:
|
|
if output_format == "ppm":
|
|
# The data is input to legacy_conversion in as similar
|
|
# as possible a manner to that input to the code used in
|
|
# LyX 1.3.x.
|
|
vec = [ argv[0], argv[2], argv[3], argv[1], argv[4], argv[5] ]
|
|
return legacy_conversion(vec)
|
|
else:
|
|
error("The old 'dvi->ps->ppm' conversion requires "
|
|
"ppm as the output format")
|
|
|
|
pngtopnm = ""
|
|
if output_format == "ppm":
|
|
pngtopnm = find_exe_or_terminate(["pngtopnm"], path)
|
|
|
|
# Compile the latex file.
|
|
latex_call = '%s "%s"' % (latex, latex_file)
|
|
|
|
latex_status, latex_stdout = run_command(latex_call)
|
|
if latex_status != None:
|
|
error("%s failed to compile %s" \
|
|
% (os.path.basename(latex), latex_file))
|
|
|
|
# Run the dvi file through dvipng.
|
|
dvi_file = latex_file_re.sub(".dvi", latex_file)
|
|
dvipng_call = '%s -Ttight -depth -height -D %d -fg "%s" -bg "%s" "%s"' \
|
|
% (dvipng, dpi, fg_color, bg_color, dvi_file)
|
|
|
|
dvipng_status, dvipng_stdout = run_command(dvipng_call)
|
|
if dvipng_status != None:
|
|
error("%s failed to generate images from %s" \
|
|
% (os.path.basename(dvipng), dvi_file))
|
|
|
|
# Extract metrics info from dvipng_stdout.
|
|
metrics_file = latex_file_re.sub(".metrics", latex_file)
|
|
if not extract_metrics_info(dvipng_stdout, metrics_file):
|
|
error("Failed to extract metrics info from dvipng")
|
|
|
|
# Convert images to ppm format if necessary.
|
|
if output_format == "ppm":
|
|
convert_to_ppm_format(pngtopnm, latex_file_re.sub("", latex_file))
|
|
|
|
return 0
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main(sys.argv)
|