#!/usr/bin/env python3
# A little wrapper around pycco, to add Rust support.
import pycco, pycco_resources
from pygments import lexers, formatters
import sys, re

# helper functions
def patch_html(source, marker, new_text):
    '''Find the [marker] in [source], and insert [new_text] after it.'''
    assert source.count(marker) == 1
    return source.replace(marker, marker + new_text, 1)

# now, monkey-patch pycco for Rust support
pycco.main.supported_languages[".rs"] = { "name": "rust", "comment_symbol": "//"}
for ext, l in pycco.main.supported_languages.items():
    # Does the line begin with a comment?
    l["comment_matcher"] = re.compile(r"^\s*" + l["comment_symbol"] + "\s?")
    # The dividing token we feed into Pygments, to delimit the boundaries between
    # sections.
    l["divider_text"] = "\n" + l["comment_symbol"] + "DIVIDER\n"
    # The mirror of `divider_text` that we expect Pygments to return. We can split
    # on this to recover the original sections.
    l["divider_html"] = re.compile(r'\n*<span class="c[1]?">' + l["comment_symbol"] + 'DIVIDER</span>\n*')
    # Get the Pygments Lexer for this language.
    l["lexer"] = lexers.get_lexer_by_name(l["name"])

# and monkey-patch the function generating the output to do some post-processing
generate_documentation_orig = pycco.main.generate_documentation
generate_documentation_called = False
def generate_documentation(*args, **kwargs):
    global generate_documentation_called
    generate_documentation_called = True
    result = generate_documentation_orig(*args, **kwargs)
    # now patch it
    result = patch_html(result, b'<link rel="stylesheet" href="pycco.css">',
                        b'<link rel="stylesheet" href="pycco_custom.css"><meta name="viewport" content="width=device-width">')
    result = patch_html(result, b'<title>', b'Rust-101: ')
    ## remove empty code blocks
    result = re.sub(b'''<div class='code'>
 *<div class="highlight"><pre>(<span></span>)?</pre></div>
 *</div>''', b'<!-- empty code block -->', result)
    # done
    return result
pycco.main.generate_documentation = generate_documentation

# call pycco
assert len(sys.argv) == 2
pycco.main.main()
assert generate_documentation_called