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josch revised this gist
Jul 11, 2011 . 1 changed file with 8 additions and 7 deletions.There are no files selected for viewing
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -12,6 +12,10 @@ import hashlib import blogofile_bf as bf html_escape_table = {"&": "&",'"': ""","'": "'",">": ">","<": "<"} html_escape = lambda text: "".join(html_escape_table.get(c,c) for c in text) tex_template = r""" \documentclass[12pt]{article} \usepackage{ucs} @@ -27,10 +31,6 @@ latex_block_re = re.compile(r"\s\$\$latex\s(.*?)\s\$", re.DOTALL) def render_tex_to_png(latex_block, png_location): """Render a TeX formatted string to an image file @@ -100,13 +100,14 @@ def render_latex_blocks(src, cache_dir="_tmp", site_images_dir="images"): if(not os.path.isfile(png_cached)): bf.util.mkdir(cache_dir) bf.filter.logger.info("Rendering LaTeX: "+tex_expr) render_tex_to_png(tex_expr,png_cached) #copy the rendered image to the site dir bf.util.mkdir(site_png_dir) shutil.copyfile(png_cached,site_png) #record the $$latex block and it's replacement <img> tag img_substitutions[m.group()] = "<img alt=\"%s\" src=\"%s%s\">" % \ (html_escape(tex_expr), bf.config.site.url, bf.util.site_path_helper(site_images_dir,fn)) #Make the <img> tag replacements in a single pass p = re.compile('|'.join(map(re.escape, img_substitutions))) return p.sub(lambda x: img_substitutions[x.group(0)], src) -
Jun 5, 2011 . 1 changed file with 2 additions and 2 deletions.There are no files selected for viewing
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -105,8 +105,8 @@ def render_latex_blocks(src, cache_dir="_tmp", site_images_dir="images"): bf.util.mkdir(site_png_dir) shutil.copyfile(png_cached,site_png) #record the $$latex block and it's replacement <img> tag img_substitutions[m.group()] = "<img src=\"%s%s\">" % \ (bf.config.site.url,bf.util.site_path_helper(site_images_dir,fn)) #Make the <img> tag replacements in a single pass p = re.compile('|'.join(map(re.escape, img_substitutions))) return p.sub(lambda x: img_substitutions[x.group(0)], src) -
Jun 4, 2011 . 1 changed file with 24 additions and 17 deletions.There are no files selected for viewing
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -13,26 +13,23 @@ import blogofile_bf as bf tex_template = r""" \documentclass[12pt]{article} \usepackage{ucs} \usepackage[utf8x]{inputenc} \usepackage{amsmath} \usepackage{amsthm} \usepackage{amssymb} \pagestyle{empty} \begin{document} $%s$ \end{document} """ latex_block_re = re.compile(r"\s\$\$latex\s(.*?)\s\$", re.DOTALL) def render_tex_math_expr_to_png(math_block, png_location): """Wrap a mathematical TeX expression in $ symbols and render""" render_tex_to_png(math_block, png_location) def render_tex_to_png(latex_block, png_location): """Render a TeX formatted string to an image file @@ -56,15 +53,25 @@ def render_tex_to_png(latex_block, png_location): stdout=subprocess.PIPE) p.wait() #Generate the .ps try: p = subprocess.Popen(shlex.split( 'dvipng -bg Transparent -gamma 1.5 -D 120 -T tight' ' --strict source.dvi -o rendered.png'), stdout=subprocess.PIPE, stderr=subprocess.PIPE) p.wait() except: p = subprocess.Popen(shlex.split('dvips source.dvi'), stdout=subprocess.PIPE, stderr=subprocess.PIPE) p.wait() #Generate the .png p = subprocess.Popen(shlex.split( 'convert -density 120 -trim -transparent' ' "#FFFFFF" source.ps rendered.png'),stdout=subprocess.PIPE) p.wait() #Copy the .png to the png_location os.chdir(previous_dir) shutil.copyfile(os.path.join(tmp_dir,"rendered.png"),png_location) -
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -1,5 +1,7 @@ """ Render TeX blocks to png This is a Blogofile filter. Place it in your _filters directory. """ import tempfile import subprocess -
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,21 @@ --- categories: Category 1, Category 2 date: 2009/07/24 16:20:00 title: Sample LaTeX post filter: latex, markdown tags: test, blogofile, cool-stuff author: Ryan --- This is a sample post with TeX blocks. This is a TeX block: $$latex y = \int_0^\infty \gamma^2 \cos(x) dx $ this is after the block. This is an inline Tex block: $$latex \cos(x) $ and this is after. This is two seperate inline Tex blocks: $$latex \sin(x) $ and then $$latex \tan(x) $ and this is after. This is a mistyped TeX block because I didn't terminate it properly. $$latex \tan(x)$ and this text is rendered too because I didn't put a space before the dollar sign $ This is a broken TeX block because I didn't put a space before it$$latex \tan(x) $ -
Apr 17, 2011 .There are no files selected for viewing
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode charactersOriginal file line number Diff line number Diff line change @@ -0,0 +1,106 @@ """ Render TeX blocks to png """ import tempfile import subprocess import shutil import shlex import os import re import hashlib import blogofile_bf as bf tex_template = r""" \documentclass{article} \usepackage{amsmath} \usepackage{amsthm} \usepackage{amssymb} \usepackage{bm} \newcommand{\mx}[1]{\mathbf{\bm{#1}}} \newcommand{\vc}[1]{\mathbf{\bm{#1}}} \newcommand{\T}{\text{T}} \pagestyle{empty} \begin{document} %s \newpage \end{document} """ latex_block_re = re.compile(r"\s\$\$latex\s(.*?)\s\$", re.DOTALL) def render_tex_math_expr_to_png(math_block, png_location): """Wrap a mathematical TeX expression in $ symbols and render""" render_tex_to_png("$%s$" % math_block, png_location) def render_tex_to_png(latex_block, png_location): """Render a TeX formatted string to an image file Depends on 'latex' and 'dvipng' binaries on the system path """ #Create a temporary directory and go into it tmp_dir = tempfile.mkdtemp() previous_dir = os.getcwd() os.chdir(tmp_dir) tex_f = open(os.path.join(tmp_dir,"source.tex"),"w") tex_f.write((tex_template % latex_block)) tex_f.close() try: #Generate the .dvi p = subprocess.Popen(shlex.split( 'latex -interaction=nonstopmode source.tex'), stdout=subprocess.PIPE) p.wait() #Generate the .ps p = subprocess.Popen(shlex.split('dvips source.dvi'), stdout=subprocess.PIPE, stderr=subprocess.PIPE) p.wait() #Generate the .png p = subprocess.Popen(shlex.split( 'convert -density 120 -trim -transparent' ' "#FFFFFF" source.ps rendered.png'),stdout=subprocess.PIPE) p.wait() #Copy the .png to the png_location os.chdir(previous_dir) shutil.copyfile(os.path.join(tmp_dir,"rendered.png"),png_location) finally: #Go back to the original directory and clean up the temp files os.chdir(previous_dir) shutil.rmtree(tmp_dir) def render_latex_blocks(src, cache_dir="_tmp", site_images_dir="images"): """Render a document with LaTeX blocks 1) Extract all the $$latex blocks 2) Render each TeX block to an image to the cache 3) Copy the (pre)rendered image from the cache to the _site dir 4) Replace the $$latex blocks with <img> tags """ img_substitutions = {} for m in latex_block_re.finditer(src): tex_expr = m.groups()[0] fn = hashlib.md5(tex_expr).hexdigest()+".png" png_cached = os.path.join(cache_dir,fn) site_png_dir = bf.util.path_join("_site",bf.util.fs_site_path_helper( site_images_dir)) site_png = bf.util.path_join(site_png_dir,fn) #only render the image if the image is not already cached if(not os.path.isfile(png_cached)): bf.util.mkdir(cache_dir) bf.filter.logger.info("Rendering LaTeX: "+tex_expr) render_tex_math_expr_to_png(tex_expr,png_cached) #copy the rendered image to the site dir bf.util.mkdir(site_png_dir) shutil.copyfile(png_cached,site_png) #record the $$latex block and it's replacement <img> tag img_substitutions[m.group()] = "<img src=\"%s\">" % \ (bf.util.site_path_helper(site_images_dir,fn)) #Make the <img> tag replacements in a single pass p = re.compile('|'.join(map(re.escape, img_substitutions))) return p.sub(lambda x: img_substitutions[x.group(0)], src) def run(src): return render_latex_blocks(src)
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