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#!/usr/bin/env python
# Creates a man page from a C file.
# Comments beginning with `/**` are treated as Groff man, except that
# 'this' is converted to \fIthis\fR, and ''this'' to \fBthis\fR.
# Non-blank lines immediately following a man page comment are treated
# as function signatures or examples and parsed into .Ft, .Fo, .Fa, .Fc. The
# immediately preceding man documentation chunk is printed after the example
# as a comment on it.
# That's about it!
import sys, re, os
from datetime import date
comment_start_re = re.compile('^\/\*\* ?')
comment_delim_re = re.compile('^[/ ]\** ?')
comment_end_re = re.compile('^ \**\/')
function_re = re.compile('^ *(?:CMARK_EXPORT\s+)?(?P<type>(?:const\s+)?\w+(?:\s*[*])?)\s*(?P<name>\w+)\s*\((?P<args>[^)]*)\)')
blank_re = re.compile('^\s*$')
macro_re = re.compile('CMARK_EXPORT *')
typedef_start_re = re.compile('typedef.*{$')
typedef_end_re = re.compile('}')
single_quote_re = re.compile("(?<!\w)'([^']+)'(?!\w)")
double_quote_re = re.compile("(?<!\w)''([^']+)''(?!\w)")
def handle_quotes(s):
return re.sub(double_quote_re, '\\\\fB\g<1>\\\\fR', re.sub(single_quote_re, '\\\\fI\g<1>\\\\fR', s))
typedef = False
mdlines = []
chunk = []
sig = []
if len(sys.argv) > 1:
sourcefile = sys.argv[1]
else:
print("Usage: make_man_page.py sourcefile")
exit(1)
with open(sourcefile, 'r') as cmarkh:
state = 'default'
for line in cmarkh:
# state transition
oldstate = state
if comment_start_re.match(line):
state = 'man'
elif comment_end_re.match(line) and state == 'man':
continue
elif comment_delim_re.match(line) and state == 'man':
state = 'man'
elif not typedef and blank_re.match(line):
state = 'default'
elif typedef and typedef_end_re.match(line):
typedef = False
elif state == 'man':
state = 'signature'
typedef = typedef_start_re.match(line)
# handle line
if state == 'man':
chunk.append(handle_quotes(re.sub(comment_delim_re, '', line)))
elif state == 'signature':
ln = re.sub(macro_re, '', line)
if typedef or not re.match(blank_re, ln):
sig.append(ln)
elif oldstate == 'signature' and state != 'signature':
if len(mdlines) > 0 and mdlines[-1] != '\n':
mdlines.append('\n')
rawsig = ''.join(sig)
m = function_re.match(rawsig)
if m:
mdlines.append('\\fI' + m.group('type') + '\\fR' + ' ')
mdlines.append('\\fB' + m.group('name') + '\\fR' + '(')
first = True
for argument in re.split(',', m.group('args')):
if not first:
mdlines.append(', ')
first = False
mdlines.append('\\fI' + argument.strip() + '\\fR')
mdlines.append(')\n')
else:
mdlines.append('.nf\n\\f[C]\n.RS 0n\n')
mdlines += sig
mdlines.append('.RE\n\\f[]\n.fi\n')
if len(mdlines) > 0 and mdlines[-1] != '\n':
mdlines.append('\n')
mdlines.append('.PP\n')
mdlines += chunk
chunk = []
sig = []
elif oldstate == 'man' and state != 'signature':
if len(mdlines) > 0 and mdlines[-1] != '\n':
mdlines.append('\n')
mdlines += chunk # add man chunk
chunk = []
mdlines.append('\n')
sys.stdout.write('.TH ' + os.path.basename(sourcefile).replace('.h','') + ' 3 "' + date.today().strftime('%B %d, %Y') + '" "LOCAL" "Library Functions Manual"\n')
sys.stdout.write(''.join(mdlines))
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