#!/usr/bin/env python
"""This script is for use as a source-filter or repo.source-filter for cgit.

The following environment variables can be used to retrieve the configuration of
the repository for which this script is called:

CGIT_REPO_URL       ( = repo.url       setting )
CGIT_REPO_NAME      ( = repo.name      setting )
CGIT_REPO_PATH      ( = repo.path      setting )
CGIT_REPO_OWNER     ( = repo.owner     setting )
CGIT_REPO_DEFBRANCH ( = repo.defbranch setting )
CGIT_REPO_SECTION   ( = section        setting )
CGIT_REPO_CLONE_URL ( = repo.clone-url setting )

"""
import sys

from pygments import highlight
from pygments.formatters import HtmlFormatter
from pygments.lexers import (
    CommonLispLexer,
    SchemeLexer,
    TextLexer,
    get_lexer_by_name,
    guess_lexer,
    guess_lexer_for_filename,
)
from pygments.lexers.shell import BashLexer
from pygments.util import ClassNotFound, shebang_matches

CommonLispLexer.filenames.append("*.asd")
CommonLispLexer.filenames.append(".stumpwmrc")

BashLexer.filenames.append("PKGBUILD")
BashLexer.filenames.append("*.install")
BashLexer.filenames.append(".zshrc")
BashLexer.filenames.append(".zprofile")

data = sys.stdin.read()
filename = sys.argv[1]
formatter = HtmlFormatter(encoding="utf-8", style="autumn")

try:
    if filename == "CMakeLists.txt":
        lexer = get_lexer_by_name("cmake")
    elif shebang_matches(data, r"guile"):
        lexer = SchemeLexer
    else:
        lexer = guess_lexer_for_filename(filename, data, encoding="utf-8")
except ClassNotFound:
    # Check if there is any shebang
    if data[0:2] == "#!":
        lexer = guess_lexer(data, encoding="utf-8")
    else:
        lexer = TextLexer(encoding="utf-8")
except TypeError:
    lexer = TextLexer(encoding="utf-8")

# print out pygments' css definitions as well
sys.stdout.write("<style>")
sys.stdout.write(formatter.get_style_defs(".highlight"))
sys.stdout.write("</style>")
sys.stdout.write(highlight(data, lexer, formatter).decode("utf-8"))