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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> 2004-06-09 Angus Leeming <leeming@lyx.org>
* scripts/lyxpreview2bitmap.sh: removed. * 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 # Full author contact details are available in file CREDITS
# with much advice from members of the preview-latex project: # with much advice from members of the preview-latex project:
# David Kastrup, dak@gnu.org and # David Kastrup, dak@gnu.org and
# Jan-Åke Larsson, jalar@mai.liu.se. # Jan-Åke Larsson, jalar@mai.liu.se.
# and with much help testing the code under Windows from # 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 # This script takes a LaTeX file and generates a collection of
# ppm image files, one per previewed snippet. # 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: # 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. # TEXFILE: the name of the .tex file to be converted.
# SCALEFACTOR: a scale factor, used to ascertain the resolution of the # SCALEFACTOR: a scale factor, used to ascertain the resolution of the
# generated image which is then passed to gs. # generated image which is then passed to gs.
@ -48,6 +33,18 @@
# * a file BASE.metrics, containing info needed by LyX to position # * a file BASE.metrics, containing info needed by LyX to position
# the images correctly on the screen. # 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 glob, os, re, string, sys
import pipes, tempfile import pipes, tempfile
@ -65,11 +62,11 @@ if os.name == "nt":
import winerror import winerror
except: except:
sys.stderr.write("Consider installing the PyWin extension modules "\ 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 use_win32_modules = 0
# Pre-compiled regular expressions. # Pre-compiled regular expression.
latex_file_re = re.compile("\.tex$") latex_file_re = re.compile("\.tex$")
@ -78,6 +75,10 @@ def usage(prog_name):
% prog_name % prog_name
def warning(message):
sys.stderr.write(message + '\n')
def error(message): def error(message):
sys.stderr.write(message + '\n') sys.stderr.write(message + '\n')
sys.exit(1) sys.exit(1)
@ -151,7 +152,7 @@ def run_command_win32(cmd):
if error: if error:
return -2, "" 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. # For safety, check that the process ended, then pick up its exit code.
win32event.WaitForSingleObject(process, win32event.INFINITE) win32event.WaitForSingleObject(process, win32event.INFINITE)
if win32process.GetExitCodeProcess(process): if win32process.GetExitCodeProcess(process):
@ -173,11 +174,18 @@ def extract_metrics_info(log_file, metrics_file):
log_re = re.compile("Preview: [ST]") log_re = re.compile("Preview: [ST]")
success = 0 success = 0
for line in open(log_file, 'r').readlines(): try:
match = log_re.match(line) for line in open(log_file, 'r').readlines():
if match != None: match = log_re.match(line)
success = 1 if match != None:
metrics.write("%s\n" % line) 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 return success
@ -193,32 +201,39 @@ def extract_resolution(log_file, dpi):
# Default values # Default values
magnification = 1000.0 magnification = 1000.0
fontsize = 0.0 fontsize = 10.0
for line in open(log_file, 'r').readlines(): try:
if found_fontsize and found_magnification: for line in open(log_file, 'r').readlines():
break if found_fontsize and found_magnification:
break
if not found_fontsize: if not found_fontsize:
match = fontsize_re.match(line) match = fontsize_re.match(line)
if match != None: if match != None:
match = extract_decimal_re.search(line) match = extract_decimal_re.search(line)
if match == None: if match == None:
error("Unable to parse: %s" % line) error("Unable to parse: %s" % line)
fontsize = string.atof(match.group(1)) fontsize = string.atof(match.group(1))
found_fontsize = 1 found_fontsize = 1
continue continue
if not found_magnification: if not found_magnification:
match = magnification_re.match(line) match = magnification_re.match(line)
if match != None: if match != None:
match = extract_integer_re.search(line) match = extract_integer_re.search(line)
if match == None: if match == None:
error("Unable to parse: %s" % line) error("Unable to parse: %s" % line)
magnification = string.atof(match.group(1)) magnification = string.atof(match.group(1))
found_magnification = 1 found_magnification = 1
continue 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) return dpi * (10.0 / fontsize) * (1000.0 / magnification)
@ -292,8 +307,8 @@ def mkstemp():
def crop_files(pnmcrop, basename): def crop_files(pnmcrop, basename):
t = pipes.Template() t = pipes.Template()
t.append("%s -left" % pnmcrop, '--') t.append('%s -left' % pnmcrop, '--')
t.append("%s -right" % pnmcrop, '--') t.append('%s -right' % pnmcrop, '--')
for file in glob.glob("%s*.ppm" % basename): for file in glob.glob("%s*.ppm" % basename):
tmp = mkstemp() tmp = mkstemp()
@ -315,7 +330,7 @@ def main(argv):
dpi = string.atoi(argv[2]) dpi = string.atoi(argv[2])
output_format = argv[3] output_format = argv[3]
if output_format != "ppm": 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. # External programs used by the script.
path = string.split(os.getenv("PATH"), os.pathsep) path = string.split(os.getenv("PATH"), os.pathsep)
@ -325,7 +340,7 @@ def main(argv):
pnmcrop = find_exe(["pnmcrop"], path) pnmcrop = find_exe(["pnmcrop"], path)
# Compile the latex file. # 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) latex_status, latex_stdout = run_command(latex_call)
if latex_status != None: if latex_status != None:
@ -336,7 +351,7 @@ def main(argv):
dvi_file = latex_file_re.sub(".dvi", latex_file) dvi_file = latex_file_re.sub(".dvi", latex_file)
ps_file = latex_file_re.sub(".ps", 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) dvips_status, dvips_stdout = run_command(dvips_call)
if dvips_status != None: if dvips_status != None:
@ -353,10 +368,10 @@ def main(argv):
alpha = 2 alpha = 2
# Generate the bitmap images # Generate the bitmap images
gs_call = "%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pnmraw " \ gs_call = '%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pnmraw ' \
"-sOutputFile=%s%%d.ppm " \ '-sOutputFile=%s%%d.ppm ' \
"-dGraphicsAlphaBit=%d -dTextAlphaBits=%d " \ '-dGraphicsAlphaBit=%d -dTextAlphaBits=%d ' \
"-r%f %s" \ '-r%f %s' \
% (gs, latex_file_re.sub("", latex_file), \ % (gs, latex_file_re.sub("", latex_file), \
alpha, alpha, resolution, ps_file) alpha, alpha, resolution, ps_file)