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"""
Miscellaneous utilities.
These are mostly used in templates, for presentation purposes.
"""
try:
import pygments
from pygments import highlight
from pygments import lexers
from pygments.formatters import HtmlFormatter
except ImportError:
pygments = None
try:
import markdown
except ImportError:
markdown = None
def shorten(s, width = 60):
if len(s) < 60:
return s
return s[:57] + "..."
def can_colorize(s):
"""True if we can colorize the string, False otherwise."""
if pygments is None:
return False
# Pygments can take a huge amount of time with long files, or with very
# long lines; these are heuristics to try to avoid those situations.
if len(s) > (512 * 1024):
return False
# If any of the first 5 lines is over 300 characters long, don't colorize.
start = 0
for i in range(5):
pos = s.find('\n', start)
if pos == -1:
break
if pos - start > 300:
return False
start = pos + 1
return True
def can_markdown(fname):
"""True if we can process file through markdown, False otherwise."""
if markdown is None:
return False
return fname.endswith(".md")
def colorize_diff(s):
lexer = lexers.DiffLexer(encoding = 'utf-8')
formatter = HtmlFormatter(encoding = 'utf-8',
cssclass = 'source_code')
return highlight(s, lexer, formatter)
def colorize_blob(fname, s):
try:
lexer = lexers.guess_lexer_for_filename(fname, s, encoding = 'utf-8')
except lexers.ClassNotFound:
# Only try to guess lexers if the file starts with a shebang,
# otherwise it's likely a text file and guess_lexer() is prone to
# make mistakes with those.
lexer = lexers.TextLexer(encoding = 'utf-8')
if s.startswith('#!'):
try:
lexer = lexers.guess_lexer(s[:80], encoding = 'utf-8')
except lexers.ClassNotFound:
pass
formatter = HtmlFormatter(encoding = 'utf-8',
cssclass = 'source_code',
linenos = 'table')
return highlight(s, lexer, formatter)
def markdown_blob(s):
return markdown.markdown(s)
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