#!/usr/bin/env python3

"""Generate release notes from our commit log.

This uses the relnotes extension directives when they're available,

and falls back to our old pre-relnotes logic that used to live in the

release-tools repo.

"""

import argparse

import re

import subprocess

rules = {

    # keep

    r"\(issue": 100,

    r"\(BC\)": 100,

    r"\(API\)": 100,

    # core commands, bump up

    r"(commit|files|log|pull|push|patch|status|tag|summary)(|s|es):": 20,

    r"(annotate|alias|branch|bookmark|clone|graft|import|verify).*:": 20,

    # extensions, bump up

    r"(mq|shelve|rebase):": 20,

    # newsy

    r": deprecate": 20,

    r"( ability|command|feature|option|support)": 10,

    # experimental

    r"hg-experimental": 20,

    r"(from|graduate).*experimental": 15,

    r"(hide|mark).*experimental": -10,

    # bug-like?

    r"(fix|don't break|improve)": 7,

    r"(not|n't|avoid|fix|prevent).*crash": 10,

    # boring stuff, bump down

    r"^contrib": -5,

    r"debug": -5,

    r"help": -5,

    r"(doc|metavar|bundle2|obsolete|obsmarker|rpm|setup|debug\S+:)": -15,

    r"(check-code|check-commit|check-config|import-checker)": -20,

    r"(flake8|lintian|pyflakes|pylint)": -20,

    # cleanups and refactoring

    r"(cleanup|white ?space|spelling|quoting)": -20,

    r"(flatten|dedent|indent|nesting|unnest)": -20,

    r"(typo|hint|note|comment|TODO|FIXME)": -20,

    r"(style:|convention|one-?liner)": -20,

    r"_": -10,

    r"(argument|absolute_import|attribute|assignment|mutable)": -15,

    r"(scope|True|False)": -10,

    r"(unused|useless|unnecessary|superfluous|duplicate|deprecated)": -10,

    r"(redundant|pointless|confusing|uninitialized|meaningless|dead)": -10,

    r": (drop|remove|delete|rip out)": -10,

    r": (inherit|rename|simplify|naming|inline)": -10,

    r"(correct doc|docstring|document .* method)": -20,

    r"(abstract|factor|extract|prepare|split|replace| import)": -20,

    r": add.*(function|method|implementation|example)": -10,

    r": (move|extract) .* (to|into|from|out of)": -20,

    r": implement ": -5,

    r": use .* implementation": -20,

    r"\S\S\S+\.\S\S\S\S+": -5,

    r": use .* instead of": -20,

    r"__": -5,

    # dumb keywords

    r"\S+/\S+:": -10,

    r"\S+\.\S+:": -10,

    # python compatibility

    r"[Pp]y(|thon) ?[23]": -20,

    r"pycompat": -20,

    r"(coerce|convert|encode) .*to (byte|sys|)(s|str|string)": -20,

    # tests

    r"^test(|s|ing|runner|-\S+):": -20,

    r"^(f|hghave|run-tests):": -20,

    r"add.* tests?": -20,

    r"(buildbot|fuzz|mock|ratchet)": -10,

    # drop

    r"^i18n-": -50,

    r"^i18n:.*(hint|comment)": -50,

    r"perf:": -50,

    r"Added.*for changeset": -50,

    r"^_": -50,

}

cutoff = 10

commits = []

groupings = [

    (r"util|parsers|repo|ctx|context|revlog|filelog|alias|cmdutil", "core"),

    (r"revset|template|ui|dirstate|hook|i18n|transaction|wire|vfs", "core"),

    (r"dispatch|exchange|localrepo|streamclone|color|pager", "core"),

    (r"hgweb|paper|coal|gitweb|monoblue|spartan", "hgweb"),

    (r"pull|push|revert|resolve|annotate|bookmark|branch|clone", "commands"),

    (r"commands|commit|config|files|graft|import|log|merge|patch", "commands"),

    (r"phases|status|summary|amend|tag|help|verify", "commands"),

    (r"rebase|mq|convert|eol|histedit|largefiles", "extensions"),

    (r"shelve|unshelve", "extensions"),

]

def main():

    desc = "example: %(prog)s 4.7.2 --stoprev 4.8rc0"

    ap = argparse.ArgumentParser(description=desc)

    ap.add_argument(

        "startrev",

        metavar="REV",

        type=str,

        help=(

            "Starting revision for the release notes. This revision "

            "won't be included, but later revisions will."

        ),

    )

    ap.add_argument(

        "--stoprev",

        metavar="REV",

        type=str,

        default="@",

        help=(

            "Stop revision for release notes. This revision will be included,"

            " but no later revisions will. This revision needs to be "

            "a descendant of startrev."

        ),

    )

    args = ap.parse_args()

    fromext = subprocess.check_output(

        [

            "hg",

            "--config",

            "extensions.releasenotes=",

            "releasenotes",

            "-r",

            "only(%s, %s)" % (args.stoprev, args.startrev),

        ]

    ).decode("utf-8")

    # Find all release notes from un-relnotes-flagged commits.

    for entry in sorted(

        subprocess.check_output(

            [

                "hg",

                "log",

                "-r",

                "only(%s, %s) - merge()" % (args.stoprev, args.startrev),

                "-T",

                r"{desc|firstline}\n",

            ]

        )

        .decode("utf-8")

        .splitlines()

    ):

        desc = entry.replace("`", "'")

        score = 0

        for rule, val in rules.items():

            if re.search(rule, desc):

                score += val

        desc = desc.replace("(issue", "(Bts:issue")

        if score >= cutoff:

            commits.append(desc)

    # Group unflagged notes.

    groups = {}

    bcs = []

    apis = []

    for d in commits:

        if "(BC)" in d:

            bcs.append(d)

        if "(API)" in d:

            apis.append(d)

        for rule, g in groupings:

            if re.match(rule, d):

                groups.setdefault(g, []).append(d)

                break

        else:

            groups.setdefault("unsorted", []).append(d)

    print(fromext)

    # print legacy release notes sections

    for g in sorted(groups):

        print("\n=== %s ===" % g)

        for d in sorted(groups[g]):

            print(" * %s" % d)

    if bcs:

        print("\n=== Behavior Changes ===\n")

    for d in sorted(bcs):

        print(" * %s" % d)

    if apis:

        print("\n=== Internal API Changes ===\n")

    for d in sorted(apis):

        print(" * %s" % d)

if __name__ == "__main__":

    main()