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Improve commentary and make the script more robust if it fails to open a

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log file.


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/branches/BRANCH_1_3_X@8838 a592a061-630c-0410-9148-cb99ea01b6c8
This commit is contained in:
Angus Leeming 2004-07-15 08:47:36 +00:00
parent 13d1259c7c
commit 561bf5d97f
2 changed files with 81 additions and 59 deletions
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7
lib/ChangeLog
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@ -1,3 +1,10 @@
2004-07-14 Angus Leeming <leeming@lyx.org>
* scripts/lyxpreview2ppm.py: improve the commentary, both in
comments in the file and in diagnostics output on error.
Use try-except blocks to catch exceptions raised by a failure
to open a file.
2004-06-09 Angus Leeming <leeming@lyx.org>
* scripts/lyxpreview2bitmap.sh: removed.

133
lib/scripts/lyxpreview2ppm.py
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@ -9,32 +9,17 @@
# Full author contact details are available in file CREDITS
# with much advice from members of the preview-latex project:
# David Kastrup, dak@gnu.org and
# Jan-Åke Larsson, jalar@mai.liu.se.
# David Kastrup, dak@gnu.org and
# Jan-Åke Larsson, jalar@mai.liu.se.
# and with much help testing the code under Windows from
# Paul A. Rubin, rubin@msu.edu.
# Paul A. Rubin, rubin@msu.edu.
# This script takes a LaTeX file and generates a collection of
# ppm image files, one per previewed snippet.
# Pre-requisites:
# * A latex executable;
# * preview.sty;
# * dvips;
# * gs;
# * pnmcrop (optional).
# preview.sty is 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 0lyxpreview.tex 128 ppm
# lyxpreview2ppm.py 0lyxpreview.tex 128 ppm
# This script takes three arguments:
# The script takes three arguments:
# TEXFILE: the name of the .tex file to be converted.
# SCALEFACTOR: a scale factor, used to ascertain the resolution of the
# generated image which is then passed to gs.
@ -48,6 +33,18 @@
# * a file BASE.metrics, containing info needed by LyX to position
# the images correctly on the screen.
# The script uses several external programs and files:
# * A latex executable;
# * preview.sty;
# * dvips;
# * gs;
# * pnmcrop (optional).
# preview.sty is part of the preview-latex project
# http://preview-latex.sourceforge.net/
# Alternatively, it can be obtained from
# CTAN/support/preview-latex/
import glob, os, re, string, sys
import pipes, tempfile
@ -65,11 +62,11 @@ if os.name == "nt":
import winerror
except:
sys.stderr.write("Consider installing the PyWin extension modules "\
"if you're irritated by the gs window being shown\n")
"if you're irritated by windows appearing briefly.\n")
use_win32_modules = 0
# Pre-compiled regular expressions.
# Pre-compiled regular expression.
latex_file_re = re.compile("\.tex$")
@ -78,6 +75,10 @@ def usage(prog_name):
% prog_name
def warning(message):
sys.stderr.write(message + '\n')
def error(message):
sys.stderr.write(message + '\n')
sys.exit(1)
@ -151,7 +152,7 @@ def run_command_win32(cmd):
if error:
return -2, ""
# Everything okay - called process has closed the pipe.
# Everything is okay --- the called process has closed the pipe.
# For safety, check that the process ended, then pick up its exit code.
win32event.WaitForSingleObject(process, win32event.INFINITE)
if win32process.GetExitCodeProcess(process):
@ -173,11 +174,18 @@ def extract_metrics_info(log_file, metrics_file):
log_re = re.compile("Preview: [ST]")
success = 0
for line in open(log_file, 'r').readlines():
match = log_re.match(line)
if match != None:
success = 1
metrics.write("%s\n" % line)
try:
for line in open(log_file, 'r').readlines():
match = log_re.match(line)
if match != None:
success = 1
metrics.write("%s\n" % line)
except:
# Unable to open the file, but do nothing here because
# the calling function will act on the value of 'success'.
warning('Warning in extract_metrics_info! Unable to open "%s"' % log_file)
warning(`sys.exc_type` + ',' + `sys.exc_value`)
return success
@ -193,32 +201,39 @@ def extract_resolution(log_file, dpi):
# Default values
magnification = 1000.0
fontsize = 0.0
fontsize = 10.0
for line in open(log_file, 'r').readlines():
if found_fontsize and found_magnification:
break
try:
for line in open(log_file, 'r').readlines():
if found_fontsize and found_magnification:
break
if not found_fontsize:
match = fontsize_re.match(line)
if match != None:
match = extract_decimal_re.search(line)
if match == None:
error("Unable to parse: %s" % line)
fontsize = string.atof(match.group(1))
found_fontsize = 1
continue
if not found_fontsize:
match = fontsize_re.match(line)
if match != None:
match = extract_decimal_re.search(line)
if match == None:
error("Unable to parse: %s" % line)
fontsize = string.atof(match.group(1))
found_fontsize = 1
continue
if not found_magnification:
match = magnification_re.match(line)
if match != None:
match = extract_integer_re.search(line)
if match == None:
error("Unable to parse: %s" % line)
magnification = string.atof(match.group(1))
found_magnification = 1
continue
if not found_magnification:
match = magnification_re.match(line)
if match != None:
match = extract_integer_re.search(line)
if match == None:
error("Unable to parse: %s" % line)
magnification = string.atof(match.group(1))
found_magnification = 1
continue
except:
warning('Warning in extract_resolution! Unable to open "%s"' % log_file)
warning(`sys.exc_type` + ',' + `sys.exc_value`)
# This is safe because both fontsize and magnification have
# non-zero default values.
return dpi * (10.0 / fontsize) * (1000.0 / magnification)
@ -292,8 +307,8 @@ def mkstemp():
def crop_files(pnmcrop, basename):
t = pipes.Template()
t.append("%s -left" % pnmcrop, '--')
t.append("%s -right" % pnmcrop, '--')
t.append('%s -left' % pnmcrop, '--')
t.append('%s -right' % pnmcrop, '--')
for file in glob.glob("%s*.ppm" % basename):
tmp = mkstemp()
@ -315,7 +330,7 @@ def main(argv):
dpi = string.atoi(argv[2])
output_format = argv[3]
if output_format != "ppm":
error("This script can generate ppm format images only.")
error("This script will generate ppm format images only.")
# External programs used by the script.
path = string.split(os.getenv("PATH"), os.pathsep)
@ -325,7 +340,7 @@ def main(argv):
pnmcrop = find_exe(["pnmcrop"], path)
# Compile the latex file.
latex_call = "%s %s" % (latex, latex_file)
latex_call = '%s %s' % (latex, latex_file)
latex_status, latex_stdout = run_command(latex_call)
if latex_status != None:
@ -336,7 +351,7 @@ def main(argv):
dvi_file = latex_file_re.sub(".dvi", latex_file)
ps_file = latex_file_re.sub(".ps", latex_file)
dvips_call = "%s -o %s %s" % (dvips, ps_file, dvi_file)
dvips_call = '%s -o %s %s' % (dvips, ps_file, dvi_file)
dvips_status, dvips_stdout = run_command(dvips_call)
if dvips_status != None:
@ -353,10 +368,10 @@ def main(argv):
alpha = 2
# Generate the bitmap images
gs_call = "%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pnmraw " \
"-sOutputFile=%s%%d.ppm " \
"-dGraphicsAlphaBit=%d -dTextAlphaBits=%d " \
"-r%f %s" \
gs_call = '%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pnmraw ' \
'-sOutputFile=%s%%d.ppm ' \
'-dGraphicsAlphaBit=%d -dTextAlphaBits=%d ' \
'-r%f %s' \
% (gs, latex_file_re.sub("", latex_file), \
alpha, alpha, resolution, ps_file)