tools.py
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from os import path
import subprocess
import logging
import yaml
# import markdown
import mistune
from pygments import highlight
from pygments.lexers import get_lexer_by_name
from pygments.formatters import html
# setup logger for this module
logger = logging.getLogger(__name__)
# ---------------------------------------------------------------------------
class HighlightRenderer(mistune.Renderer):
def block_code(self, code, lang=None):
if lang is None:
return f'\n<pre><code>{mistune.escape(code)}</code></pre>\n'
else:
lexer = get_lexer_by_name(lang, stripall=True)
formatter = html.HtmlFormatter()
return highlight(code, lexer, formatter)
def image(self, src, title, text):
src = 'FIXME' # FIXME
return super().image(src, title, text)
renderer = HighlightRenderer(hard_wrap=True)
markdown = mistune.Markdown(renderer=renderer)
# ---------------------------------------------------------------------------
# load data from yaml file
# ---------------------------------------------------------------------------
def load_yaml(filename, default=None):
try:
f = open(path.expanduser(filename), 'r', encoding='utf-8')
except IOError:
logger.error(f'Can\'t open file "{filename}"')
return default
else:
with f:
try:
return yaml.load(f)
except yaml.YAMLError as e:
mark = e.problem_mark
logger.error('In YAML file "{0}" near line {1}, column {2}.'.format(filename, mark.line, mark.column+1))
return default
# ---------------------------------------------------------------------------
# Runs a script and returns its stdout parsed as yaml, or None on error.
# ---------------------------------------------------------------------------
def run_script(script, stdin='', timeout=5):
script = path.expanduser(script)
try:
p = subprocess.run([script],
input=stdin,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
universal_newlines=True,
timeout=timeout,
)
except FileNotFoundError:
logger.error(f'Script "{script}" not found.')
except PermissionError:
logger.error(f'Script "{script}" not executable. Wrong permissions?')
except subprocess.TimeoutExpired:
logger.error(f'Timeout {timeout}s exceeded while running "{script}".')
else:
if p.returncode != 0:
logger.error(f'Script "{script}" returned error code {p.returncode}.')
else:
try:
output = yaml.load(p.stdout)
except:
logger.error('Error parsing yaml output of "{script}"')
else:
return output
# ---------------------------------------------------------------------------
def md_to_html(text, q=None):
return markdown(text)