ref: c88fc5b2f96911968c3e8841509612e184e1cc84
parent: bf2c903000f96f9eef290bba9457262d5b115b94
parent: cb265a497d05416572343b345a01ffa048aefda6
author: John Koleszar <jkoleszar@google.com>
date: Wed Mar 28 13:47:24 EDT 2012
Merge "FTFY: an automated style corrector"
--- /dev/null
+++ b/tools/ftfy.sh
@@ -1,0 +1,123 @@
+#!/bin/sh
+self="$0"
+
+usage() {+ cat <<EOF >&2
+Usage: $self [option]
+
+This script applies a whitespace transformation to the commit at HEAD. If no
+options are given, then the modified files are left in the working tree.
+
+Options:
+ -n, --dry-run Shows a diff of the changes to be made.
+ --amend Squashes the changes into the commit at HEAD
+ --commit Creates a new commit containing only the whitespace changes
+EOF
+ rm -f ${CLEAN_FILES}+ exit 1
+}
+
+
+log() {+ echo "${self##*/}: $@" >&2+}
+
+
+vpx_style() {+ astyle --style=bsd --min-conditional-indent=0 --break-blocks \
+ --pad-oper --pad-header --unpad-paren \
+ --align-pointer=name \
+ --indent-preprocessor --convert-tabs --indent-labels \
+ --suffix=none --quiet "$@"
+ sed -i 's/[[:space:]]\{1,\},/,/g' "$@"+}
+
+
+apply() {+ patch -p1 < "$1"
+}
+
+
+commit() {+ LAST_CHANGEID=$(git show | awk '/Change-Id:/{print $2}')+ if [ -z "$LAST_CHANGEID" ]; then
+ log "HEAD doesn't have a Change-Id, unable to generate a new commit"
+ exit 1
+ fi
+
+ # Build a deterministic Change-Id from the parent's
+ NEW_CHANGEID=${LAST_CHANGEID}-styled+ NEW_CHANGEID=I$(echo $NEW_CHANGEID | git hash-object --stdin)
+
+ # Commit, preserving authorship from the parent commit.
+ git commit -a -C HEAD > /dev/null
+ git commit --amend -F- << EOF
+Cosmetic: Fix whitespace in change ${LAST_CHANGEID:0:9}+
+Change-Id: ${NEW_CHANGEID}+EOF
+}
+
+
+amend() {+ git commit -a --amend -C HEAD
+}
+
+
+# Temporary files
+ORIG_DIFF=orig.diff.$$
+MODIFIED_DIFF=modified.diff.$$
+FINAL_DIFF=final.diff.$$
+CLEAN_FILES="${ORIG_DIFF} ${MODIFIED_DIFF} ${FINAL_DIFF}"+
+# Preconditions
+[ $# -lt 2 ] || usage
+
+if ! git diff --quiet HEAD; then
+ log "Working tree is dirty, commit your changes first"
+ exit 1
+fi
+
+# Need to be in the root
+cd "$(git rev-parse --show-toplevel)"
+
+# Collect the original diff
+git show > "${ORIG_DIFF}"+
+# Apply the style guide on the modified files and collect its diff
+for f in $(git diff HEAD^ --name-only | grep '\.[ch]$'); do
+ case "$f" in
+ third_party/*) continue;;
+ nestegg/*) continue;;
+ esac
+ vpx_style "$f"
+done
+git diff --no-color --no-ext-diff > "${MODIFIED_DIFF}"+
+# Intersect the two diffs
+$(dirname ${self})/intersect-diffs.py \+ "${ORIG_DIFF}" "${MODIFIED_DIFF}" > "${FINAL_DIFF}"+INTERSECT_RESULT=$?
+git reset --hard >/dev/null
+
+if [ $INTERSECT_RESULT -eq 0 ]; then
+ # Handle options
+ if [ -n "$1" ]; then
+ case "$1" in
+ -h|--help) usage;;
+ -n|--dry-run) cat "${FINAL_DIFF}";;+ --commit) apply "${FINAL_DIFF}"; commit;;+ --amend) apply "${FINAL_DIFF}"; amend;;+ *) usage;;
+ esac
+ else
+ apply "${FINAL_DIFF}"+ if ! git diff --quiet; then
+ log "Formatting changes applied, verify and commit."
+ log "See also: http://www.webmproject.org/code/contribute/conventions/"
+ git diff --stat
+ fi
+ fi
+fi
+
+rm -f ${CLEAN_FILES}--- /dev/null
+++ b/tools/intersect-diffs.py
@@ -1,0 +1,189 @@
+#!/usr/bin/env python
+## Copyright (c) 2012 The WebM project authors. All Rights Reserved.
+##
+## Use of this source code is governed by a BSD-style license
+## that can be found in the LICENSE file in the root of the source
+## tree. An additional intellectual property rights grant can be found
+## in the file PATENTS. All contributing project authors may
+## be found in the AUTHORS file in the root of the source tree.
+##
+"""Calculates the "intersection" of two unified diffs.
+
+Given two diffs, A and B, it finds all hunks in B that had non-context lines
+in A and prints them to stdout. This is useful to determine the hunks in B that
+are relevant to A. The resulting file can be applied with patch(1) on top of A.
+"""
+
+__author__ = "jkoleszar@google.com"
+
+import re
+import sys
+
+
+class DiffLines(object):
+ """A container for one half of a diff."""
+
+ def __init__(self, filename, offset, length):
+ self.filename = filename
+ self.offset = offset
+ self.length = length
+ self.lines = []
+ self.delta_line_nums = []
+
+ def Append(self, line):
+ l = len(self.lines)
+ if line[0] != " ":
+ self.delta_line_nums.append(self.offset + l)
+ self.lines.append(line[1:])
+ assert l+1 <= self.length
+
+ def Complete(self):
+ return len(self.lines) == self.length
+
+ def __contains__(self, item):
+ return item >= self.offset and item <= self.offset + self.length - 1
+
+
+class DiffHunk(object):
+ """A container for one diff hunk, consisting of two DiffLines."""
+
+ def __init__(self, header, file_a, file_b, start_a, len_a, start_b, len_b):
+ self.header = header
+ self.left = DiffLines(file_a, start_a, len_a)
+ self.right = DiffLines(file_b, start_b, len_b)
+ self.lines = []
+
+ def Append(self, line):
+ """Adds a line to the DiffHunk and its DiffLines children."""
+ if line[0] == "-":
+ self.left.Append(line)
+ elif line[0] == "+":
+ self.right.Append(line)
+ elif line[0] == " ":
+ self.left.Append(line)
+ self.right.Append(line)
+ else:
+ assert False, ("Unrecognized character at start of diff line "+ "%r" % line[0])
+ self.lines.append(line)
+
+ def Complete(self):
+ return self.left.Complete() and self.right.Complete()
+
+ def __repr__(self):
+ return "DiffHunk(%s, %s, len %d)" % (
+ self.left.filename, self.right.filename,
+ max(self.left.length, self.right.length))
+
+
+def ParseDiffHunks(stream):
+ """Walk a file-like object, yielding DiffHunks as they're parsed."""
+
+ file_regex = re.compile(r"(\+\+\+|---) (\S+)")
+ range_regex = re.compile(r"@@ -(\d+)(,(\d+))? \+(\d+)(,(\d+))?")
+ hunk = None
+ while True:
+ line = stream.readline()
+ if not line:
+ break
+
+ if hunk is None:
+ # Parse file names
+ diff_file = file_regex.match(line)
+ if diff_file:
+ if line.startswith("---"):+ a_line = line
+ a = diff_file.group(2)
+ continue
+ if line.startswith("+++"):+ b_line = line
+ b = diff_file.group(2)
+ continue
+
+ # Parse offset/lengths
+ diffrange = range_regex.match(line)
+ if diffrange:
+ if diffrange.group(2):
+ start_a = int(diffrange.group(1))
+ len_a = int(diffrange.group(3))
+ else:
+ start_a = 1
+ len_a = int(diffrange.group(1))
+
+ if diffrange.group(5):
+ start_b = int(diffrange.group(4))
+ len_b = int(diffrange.group(6))
+ else:
+ start_b = 1
+ len_b = int(diffrange.group(4))
+
+ header = [a_line, b_line, line]
+ hunk = DiffHunk(header, a, b, start_a, len_a, start_b, len_b)
+ else:
+ # Add the current line to the hunk
+ hunk.Append(line)
+
+ # See if the whole hunk has been parsed. If so, yield it and prepare
+ # for the next hunk.
+ if hunk.Complete():
+ yield hunk
+ hunk = None
+
+ # Partial hunks are a parse error
+ assert hunk is None
+
+
+def FormatDiffHunks(hunks):
+ """Re-serialize a list of DiffHunks."""
+ r = []
+ last_header = None
+ for hunk in hunks:
+ this_header = hunk.header[0:2]
+ if last_header != this_header:
+ r.extend(hunk.header)
+ last_header = this_header
+ else:
+ r.extend(hunk.header[2])
+ r.extend(hunk.lines)
+ r.append("\n")+ return "".join(r)
+
+
+def ZipHunks(rhs_hunks, lhs_hunks):
+ """Join two hunk lists on filename."""
+ for rhs_hunk in rhs_hunks:
+ rhs_file = rhs_hunk.right.filename.split("/")[1:]+
+ for lhs_hunk in lhs_hunks:
+ lhs_file = lhs_hunk.left.filename.split("/")[1:]+ if lhs_file != rhs_file:
+ continue
+ yield (rhs_hunk, lhs_hunk)
+
+
+def main():
+ old_hunks = [x for x in ParseDiffHunks(open(sys.argv[1], "r"))]
+ new_hunks = [x for x in ParseDiffHunks(open(sys.argv[2], "r"))]
+ out_hunks = []
+
+ # Join the right hand side of the older diff with the left hand side of the
+ # newer diff.
+ for old_hunk, new_hunk in ZipHunks(old_hunks, new_hunks):
+ if new_hunk in out_hunks:
+ continue
+ old_lines = old_hunk.right
+ new_lines = new_hunk.left
+
+ # Determine if this hunk overlaps any non-context line from the other
+ for i in old_lines.delta_line_nums:
+ if i in new_lines:
+ out_hunks.append(new_hunk)
+ break
+
+ if out_hunks:
+ print FormatDiffHunks(out_hunks)
+ else:
+ sys.exit(1)
+
+if __name__ == "__main__":
+ main()