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#!/usr/bin/python3
# This script takes a manpage written in github-flavored markdown and turns it
# into a html web page and a nroff man page. The input file must have the name
# of the program and the section in the format: NAME.NUM.md. The output files
# are written into the current directory named NAME.NUM.html and NAME.NUM. The
# input format has one extra extension: if a numbered list starts at 0, it is
# turned into a description list. The dl's dt tag is taken from the contents of
# the first tag inside the li, which is usually a p tag or a code tag. The
# cmarkgfm lib is used to transforms the input file into html. The html.parser
# is used as a state machine that both tweaks the html and outputs the nroff
# data based on the html tags.
#
# Copyright (C) 2020 Wayne Davison
#
# This program is freely redistributable.
import sys, os, re, argparse, time
from html.parser import HTMLParser
CONSUMES_TXT = set('h1 h2 p li pre'.split())
HTML_START = """\
<html><head>
<title>%s</title>
<link href="https://fonts.googleapis.com/css2?family=Roboto&display=swap" rel="stylesheet">
<style>
body {
max-width: 40em;
margin: auto;
font-size: 1.2em;
font-family: 'Roboto', sans-serif;
}
blockquote pre code {
background: #eee;
}
dd p:first-of-type {
margin-block-start: 0em;
}
</style>
</head><body>
"""
HTML_END = """\
<div style="float: right"><p><i>%s</i></p></div>
</body></html>
"""
MAN_START = r"""
.TH "%s" "%s" "%s" "" ""
""".lstrip()
MAN_END = """\
"""
NORM_FONT = ('\1', r"\fP")
BOLD_FONT = ('\2', r"\fB")
ULIN_FONT = ('\3', r"\fI")
env_subs = { }
def main():
mtime = None
fi = re.match(r'^(?P<fn>(?P<srcdir>.+/)?(?P<name>(?P<prog>[^/]+)\.(?P<sect>\d+))\.md)$', args.mdfile)
if not fi:
die('Failed to parse NAME.NUM.md out of input file:', args.mdfile)
fi = argparse.Namespace(**fi.groupdict())
if not fi.srcdir:
fi.srcdir = './'
chk_files = 'latest-year.h Makefile'.split()
for fn in chk_files:
try:
st = os.lstat(fi.srcdir + fn)
except:
die('Failed to find', fi.srcdir + fn)
if not mtime:
mtime = st.st_mtime
with open(fi.srcdir + 'Makefile', 'r', encoding='utf-8') as fh:
for line in fh:
m = re.match(r'^(\w+)=(.+)', line)
if not m:
continue
var, val = (m[1], m[2])
while re.search(r'\$\{', val):
val = re.sub(r'\$\{(\w+)\}', lambda m: env_subs[m[1]], val)
env_subs[var] = val
if var == 'VERSION':
break
MarkdownToManPage(fi, mtime)
class MarkdownToManPage(HTMLParser):
def __init__(self, fi, mtime):
HTMLParser.__init__(self, convert_charrefs=True)
self.man_fh = self.html_fh = None
self.state = argparse.Namespace(
list_state = [ ],
p_macro = ".P\n",
first_li_tag = False,
first_dd_tag = False,
dt_from = None,
in_pre = False,
txt = '',
)
self.date = time.strftime('%d %b %Y', time.localtime(mtime))
with open(fi.fn, 'r', encoding='utf-8') as fh:
txt = re.sub(r'@VERSION@', env_subs['VERSION'], fh.read())
txt = re.sub(r'@LIBDIR@', env_subs['libdir'], txt)
html = cmarkgfm.github_flavored_markdown_to_html(txt)
txt = None
if args.test:
self.html_fh = open(os.devnull, 'w', encoding='utf-8')
self.man_fh = self.html_fh
else:
self.html_fn = fi.name + '.html'
self.html_fh = open(self.html_fn, 'w', encoding='utf-8')
self.html_fh.write(HTML_START % fi.prog + '(' + fi.sect + ') man page')
self.man_fn = fi.name
self.man_fh = open(self.man_fn, 'w', encoding='utf-8')
self.man_fh.write(MAN_START % (fi.prog, fi.sect, self.date))
self.feed(html)
def __del__(self):
if args.test:
print("The test was successful.")
return
if self.html_fh:
self.html_fh.write(HTML_END % self.date)
self.html_fh.close()
print("Output HTML page: ", self.html_fn)
if self.man_fh:
self.man_fh.write(MAN_END)
self.man_fh.close()
print("Output man page: ", self.man_fn)
def handle_starttag(self, tag, attrs_list):
st = self.state
if args.debug:
print('START', tag, attrs_list, st)
if st.first_li_tag:
if st.list_state[-1] == 'dl':
st.dt_from = tag
if tag == 'p':
tag = 'dt'
else:
self.html_fh.write('<dt>')
st.first_li_tag = False
if tag == 'p':
if not st.first_dd_tag:
self.man_fh.write(st.p_macro)
elif tag == 'li':
st.first_li_tag = True
lstate = st.list_state[-1]
if lstate == 'dl':
return
if lstate == 'o':
self.man_fh.write(".IP o\n")
else:
self.man_fh.write(".IP " + str(lstate) + ".\n")
st.list_state[-1] += 1
elif tag == 'blockquote':
self.man_fh.write(".RS 4\n")
elif tag == 'pre':
st.in_pre = True
self.man_fh.write(st.p_macro + ".nf\n")
elif tag == 'code' and not st.in_pre:
st.txt += BOLD_FONT[0]
elif tag == 'strong' or tag == 'bold':
st.txt += BOLD_FONT[0]
elif tag == 'i' or tag == 'em':
st.txt += ULIN_FONT[0]
elif tag == 'ol':
start = 1
for var, val in attrs_list:
if var == 'start':
start = int(val) # We only support integers.
break
if st.list_state:
self.man_fh.write(".RS\n")
if start == 0:
tag = 'dl'
attrs_list = [ ]
st.list_state.append('dl')
else:
st.list_state.append(start)
self.man_fh.write(st.p_macro)
st.p_macro = ".IP\n"
elif tag == 'ul':
self.man_fh.write(st.p_macro)
if st.list_state:
self.man_fh.write(".RS\n")
st.p_macro = ".IP\n"
st.list_state.append('o')
outer_tag = '<' + tag
for var, val in attrs_list:
outer_tag += ' ' + var + '=' + safeText(val) + '"'
self.html_fh.write(outer_tag + '>')
st.first_dd_tag = False
def handle_endtag(self, tag):
st = self.state
if args.debug:
print(' END', tag, st)
if tag in CONSUMES_TXT or st.dt_from == tag:
txt = st.txt.strip()
st.txt = ''
else:
txt = None
add_to_txt = None
if tag == 'h1':
self.man_fh.write(st.p_macro + '.SH "' + manify(txt) + '"\n')
elif tag == 'p':
if st.dt_from == 'p':
tag = 'dt'
self.man_fh.write('.IP "' + manify(txt) + '"\n')
st.dt_from = None
else:
self.man_fh.write(manify(txt) + "\n")
elif tag == 'li':
if st.list_state[-1] == 'dl':
if st.first_li_tag:
die("Invalid 0. -> td translation")
tag = 'dd'
if txt != '':
self.man_fh.write(manify(txt) + "\n")
st.first_li_tag = False
elif tag == 'blockquote':
self.man_fh.write(".RE\n")
elif tag == 'pre':
st.in_pre = False
self.man_fh.write(manify(txt) + "\n.fi\n")
elif tag == 'code' and not st.in_pre:
add_to_txt = NORM_FONT[0]
elif tag == 'strong' or tag == 'bold':
add_to_txt = NORM_FONT[0]
elif tag == 'i' or tag == 'em':
add_to_txt = NORM_FONT[0]
elif tag == 'ol' or tag == 'ul':
if st.list_state.pop() == 'dl':
tag = 'dl'
if st.list_state:
self.man_fh.write(".RE\n")
else:
st.p_macro = ".P\n"
st.first_dd_tag = False
self.html_fh.write('</' + tag + '>')
if add_to_txt:
if txt is None:
st.txt += add_to_txt
else:
txt += add_to_txt
if st.dt_from == tag:
self.man_fh.write('.IP "' + manify(txt) + '"\n')
self.html_fh.write('</dt><dd>')
st.first_dd_tag = True
st.dt_from = None
elif tag == 'dt':
self.html_fh.write('<dd>')
st.first_dd_tag = True
def handle_data(self, data):
st = self.state
if args.debug:
print(' DATA', [data], st)
self.html_fh.write(safeText(data))
st.txt += data
def manify(txt):
return re.sub(r"^(['.])", r'\&\1', txt.replace('\\', '\\\\')
.replace(NORM_FONT[0], NORM_FONT[1])
.replace(BOLD_FONT[0], BOLD_FONT[1])
.replace(ULIN_FONT[0], ULIN_FONT[1]), flags=re.M)
def safeText(txt):
return txt.replace('&', '&').replace('<', '<').replace('>', '>').replace('"', '"')
def warn(*msg):
print(*msg, file=sys.stderr)
def die(*msg):
warn(*msg)
sys.exit(1)
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='Transform a NAME.NUM.md markdown file into a NAME.NUM.html web page & a NAME.NUM man page.', add_help=False)
parser.add_argument('--test', action='store_true', help='Test if we can parse the input w/o updating any files.')
parser.add_argument('--debug', '-D', action='count', default=0, help='Output copious info on the html parsing.')
parser.add_argument("--help", "-h", action="help", help="Output this help message and exit.")
parser.add_argument('mdfile', help="The NAME.NUM.md file to parse.")
args = parser.parse_args()
try:
import cmarkgfm
except:
die("The cmarkgfm library is not available for python3.")
main()
|
