1 #!/bin/sh 2 self="$0" 3 dirname_self=$(dirname "$self") 4 5 usage() { 6 cat <<EOF >&2 7 Usage: $self [option] 8 9 This script applies a whitespace transformation to the commit at HEAD. If no 10 options are given, then the modified files are left in the working tree. 11 12 Options: 13 -h, --help Shows this message 14 -n, --dry-run Shows a diff of the changes to be made. 15 --amend Squashes the changes into the commit at HEAD 16 This option will also reformat the commit message. 17 --commit Creates a new commit containing only the whitespace changes 18 --msg-only Reformat the commit message only, ignore the patch itself. 19 20 EOF 21 rm -f ${CLEAN_FILES} 22 exit 1 23 } 24 25 26 log() { 27 echo "${self##*/}: $@" >&2 28 } 29 30 31 vpx_style() { 32 for f; do 33 case "$f" in 34 *.h|*.c|*.cc) 35 clang-format -i --style=file "$f" 36 ;; 37 esac 38 done 39 } 40 41 42 apply() { 43 [ $INTERSECT_RESULT -ne 0 ] && patch -p1 < "$1" 44 } 45 46 47 commit() { 48 LAST_CHANGEID=$(git show | awk '/Change-Id:/{print $2}') 49 if [ -z "$LAST_CHANGEID" ]; then 50 log "HEAD doesn't have a Change-Id, unable to generate a new commit" 51 exit 1 52 fi 53 54 # Build a deterministic Change-Id from the parent's 55 NEW_CHANGEID=${LAST_CHANGEID}-styled 56 NEW_CHANGEID=I$(echo $NEW_CHANGEID | git hash-object --stdin) 57 58 # Commit, preserving authorship from the parent commit. 59 git commit -a -C HEAD > /dev/null 60 git commit --amend -F- << EOF 61 Cosmetic: Fix whitespace in change ${LAST_CHANGEID:0:9} 62 63 Change-Id: ${NEW_CHANGEID} 64 EOF 65 } 66 67 68 show_commit_msg_diff() { 69 if [ $DIFF_MSG_RESULT -ne 0 ]; then 70 log "Modified commit message:" 71 diff -u "$ORIG_COMMIT_MSG" "$NEW_COMMIT_MSG" | tail -n +3 72 fi 73 } 74 75 76 amend() { 77 show_commit_msg_diff 78 if [ $DIFF_MSG_RESULT -ne 0 ] || [ $INTERSECT_RESULT -ne 0 ]; then 79 git commit -a --amend -F "$NEW_COMMIT_MSG" 80 fi 81 } 82 83 84 diff_msg() { 85 git log -1 --format=%B > "$ORIG_COMMIT_MSG" 86 "${dirname_self}"/wrap-commit-msg.py \ 87 < "$ORIG_COMMIT_MSG" > "$NEW_COMMIT_MSG" 88 cmp -s "$ORIG_COMMIT_MSG" "$NEW_COMMIT_MSG" 89 DIFF_MSG_RESULT=$? 90 } 91 92 93 # Temporary files 94 ORIG_DIFF=orig.diff.$$ 95 MODIFIED_DIFF=modified.diff.$$ 96 FINAL_DIFF=final.diff.$$ 97 ORIG_COMMIT_MSG=orig.commit-msg.$$ 98 NEW_COMMIT_MSG=new.commit-msg.$$ 99 CLEAN_FILES="${ORIG_DIFF} ${MODIFIED_DIFF} ${FINAL_DIFF}" 100 CLEAN_FILES="${CLEAN_FILES} ${ORIG_COMMIT_MSG} ${NEW_COMMIT_MSG}" 101 102 # Preconditions 103 [ $# -lt 2 ] || usage 104 105 if ! clang-format -version >/dev/null 2>&1; then 106 log "clang-format not found" 107 exit 1 108 fi 109 110 if ! git diff --quiet HEAD; then 111 log "Working tree is dirty, commit your changes first" 112 exit 1 113 fi 114 115 # Need to be in the root 116 cd "$(git rev-parse --show-toplevel)" 117 118 # Collect the original diff 119 git show > "${ORIG_DIFF}" 120 121 # Apply the style guide on new and modified files and collect its diff 122 for f in $(git diff HEAD^ --name-only -M90 --diff-filter=AM); do 123 case "$f" in 124 third_party/*) continue;; 125 esac 126 vpx_style "$f" 127 done 128 git diff --no-color --no-ext-diff > "${MODIFIED_DIFF}" 129 130 # Intersect the two diffs 131 "${dirname_self}"/intersect-diffs.py \ 132 "${ORIG_DIFF}" "${MODIFIED_DIFF}" > "${FINAL_DIFF}" 133 INTERSECT_RESULT=$? 134 git reset --hard >/dev/null 135 136 # Fixup the commit message 137 diff_msg 138 139 # Handle options 140 if [ -n "$1" ]; then 141 case "$1" in 142 -h|--help) usage;; 143 -n|--dry-run) cat "${FINAL_DIFF}"; show_commit_msg_diff;; 144 --commit) apply "${FINAL_DIFF}"; commit;; 145 --amend) apply "${FINAL_DIFF}"; amend;; 146 --msg-only) amend;; 147 *) usage;; 148 esac 149 else 150 apply "${FINAL_DIFF}" 151 if ! git diff --quiet; then 152 log "Formatting changes applied, verify and commit." 153 log "See also: http://www.webmproject.org/code/contribute/conventions/" 154 git diff --stat 155 fi 156 fi 157 158 rm -f ${CLEAN_FILES} 159
