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#!/usr/bin/env python
# Creates a man page from a C file.
# Comments beginning with `/**` are treated as Groff man.
# 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('}')
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(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('.Ft ' + m.group('type') + '\n')
mdlines.append('.Fo ' + m.group('name') + '\n')
for argument in re.split('/s*,/s*', m.group('args')):
mdlines.append('.Fa ' + argument + '\n')
mdlines.append('.Fc\n')
else:
mdlines.append('.Bd -literal\n')
mdlines += sig
mdlines.append('.Ed\n')
if len(mdlines) > 0 and mdlines[-1] != '\n':
mdlines.append('\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('.Dd ' + date.today().isoformat() + '\n')
sys.stdout.write('.Dt ' + os.path.basename(sourcefile).replace('.h','') + ' 3\n')
sys.stdout.write(''.join(mdlines))
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