util/maint/show_changes_by_file.py

#!/usr/bin/env python2.7
#
# Copyright (c) 2018 Advanced Micro Devices, Inc.
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#
# For use for simulation and test purposes only
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# this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
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# without specific prior written permission.
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# Author: Brandon Potter


import subprocess
from collections import OrderedDict, defaultdict

class OrderedDefaultDict(OrderedDict, defaultdict):
    def __init__(self, default_factory=None, *args, **kwargs):
        super(OrderedDefaultDict, self).__init__(*args, **kwargs)
        self.default_factory = default_factory

def diff_files(upstream, feature, paths=[]):
    """Given two git branches and an optional parameter 'path', determine
    which files differ between the two branches. Afterwards, organize the
    files with a printer-friendly data structure.

    Returns: Dictionary of directories with their corresponding files
    """

    raw =  subprocess.check_output(
        [ "git", "diff", "--name-status", "%s..%s" % (upstream, feature),
        "--" ] + paths
    )

    path = [line.split('\t')[1] for line in raw.splitlines()]

    odd = OrderedDefaultDict(list)
    for p in path:
        direc = subprocess.check_output(["dirname", p]).strip() + "/"
        filename = subprocess.check_output(["basename", p]).strip()
        odd[direc].append("%s" % filename)

    return odd

def cl_hash(upstream, feature, path):
    """Given two git branches and full path, record the identifier hash
    for changesets which diff between the upstream branch and feature branch.
    The changesets are ordered from oldest to youngest changesets in the
    list.

    Returns: List of identifier hashes
    """

    raw = subprocess.check_output(
        [ "git", "log", "--oneline", "%s..%s" % (upstream, feature),
        "--", path ]
    )

    return [l.split()[0] for l in raw.splitlines()]

def _main():
    import argparse
    parser = argparse.ArgumentParser(
        description="List all changes between an upstream branch and a " \
                    "feature branch by filename(s) and changeset hash(es).")

    parser.add_argument("--upstream", "-u", type=str, default="origin/master",
                        help="Upstream branch for comparison. " \
                        "Default: %(default)s")
    parser.add_argument("--feature", "-f", type=str, default="HEAD",
                        help="Feature branch for comparison. " \
                        "Default: %(default)s")
    parser.add_argument("paths", metavar="PATH", type=str, nargs="*",
                        help="Paths to list changes for")

    args = parser.parse_args()

    odd = diff_files(args.upstream, args.feature, paths=args.paths)

    for key, value in odd.iteritems():
        print key
        for entry in value:
            print "    %s" % entry
            path = key + entry
            sha = cl_hash(args.upstream, args.feature, path)
            for s in sha:
                print "\t%s" % s
        print

if __name__ == "__main__":
    _main()