hgmerge
author Vadim Gelfer <vadim.gelfer@gmail.com>
Tue, 14 Mar 2006 23:01:11 -0800
changeset 1961 eff46e2c9d67
parent 1885 c4d577262d00
child 2051 6a03cff2b0f5
permissions -rwxr-xr-x
merge with crew.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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#!/bin/sh
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#
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# hgmerge - default merge helper for Mercurial
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#
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# This tries to find a way to do three-way merge on the current system.
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# The result ought to end up in $1.  Script is run in root directory of
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# repository.
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#
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# Environment variables set by Mercurial:
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# HG_FILE            name of file within repo
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# HG_MY_NODE         revision being merged
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# HG_OTHER_NODE      revision being merged
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set -e # bail out quickly on failure
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LOCAL="$1"
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BASE="$2"
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OTHER="$3"
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if [ -z "$EDITOR" ]; then
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    EDITOR="vi"
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fi
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# find decent versions of our utilities, insisting on the GNU versions where we
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# need to
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MERGE="merge"
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DIFF3="gdiff3"
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DIFF="gdiff"
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PATCH="gpatch"
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type "$MERGE" >/dev/null 2>&1 || MERGE=
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type "$DIFF3" >/dev/null 2>&1 || DIFF3="diff3"
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$DIFF3 --version >/dev/null 2>&1 || DIFF3=
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type "$DIFF"  >/dev/null 2>&1 || DIFF="diff"
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type "$DIFF"  >/dev/null 2>&1 || DIFF=
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type "$PATCH" >/dev/null 2>&1 || PATCH="patch"
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type "$PATCH" >/dev/null 2>&1 || PATCH=
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# find optional visual utilities
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FILEMERGE="/Developer/Applications/Utilities/FileMerge.app/Contents/MacOS/FileMerge"
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KDIFF3="kdiff3"
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TKDIFF="tkdiff"
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MELD="meld"
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type "$FILEMERGE" >/dev/null 2>&1 || FILEMERGE=
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type "$KDIFF3"    >/dev/null 2>&1 || KDIFF3=
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type "$TKDIFF"    >/dev/null 2>&1 || TKDIFF=
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type "$MELD"      >/dev/null 2>&1 || MELD=
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# random part of names
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RAND="$RANDOM$RANDOM"
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# temporary directory for diff+patch merge
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HGTMP="${TMPDIR-/tmp}/hgmerge.$RAND"
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# backup file
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BACKUP="$LOCAL.orig.$RAND"
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# file used to test for file change
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CHGTEST="$LOCAL.chg.$RAND"
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# put all your required cleanup here
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cleanup() {
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    rm -f "$BACKUP" "$CHGTEST"
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    rm -rf "$HGTMP"
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}
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# functions concerning program exit
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success() {
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    cleanup
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    exit 0
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}
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failure() {
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    echo "merge failed" 1>&2
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    mv "$BACKUP" "$LOCAL"
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    cleanup
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    exit 1
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}
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# Ask if the merge was successful
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ask_if_merged() {
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    while true; do
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        echo "$LOCAL seems unchanged."
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        echo "Was the merge successful? [y/n]"
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        read answer
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        case "$answer" in
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            y*|Y*) success;;
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            n*|N*) failure;;
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        esac
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    done
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}
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# Clean up when interrupted
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trap "failure" 1 2 3 6 15 # HUP INT QUIT ABRT TERM
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# Back up our file (and try hard to keep the mtime unchanged)
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mv "$LOCAL" "$BACKUP"
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cp "$BACKUP" "$LOCAL"
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# Attempt to do a non-interactive merge
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if [ -n "$MERGE" -o -n "$DIFF3" ]; then
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    if [ -n "$MERGE" ]; then
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        $MERGE "$LOCAL" "$BASE" "$OTHER" 2> /dev/null && success
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    elif [ -n "$DIFF3" ]; then
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        $DIFF3 -m "$BACKUP" "$BASE" "$OTHER" > "$LOCAL" && success
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    fi
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    if [ $? -gt 1 ]; then
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        echo "automatic merge failed! Exiting." 1>&2
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        failure
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    fi
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fi
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# on MacOS X try FileMerge.app, shipped with Apple's developer tools
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if [ -n "$FILEMERGE" ]; then
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    cp "$BACKUP" "$LOCAL"
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    cp "$BACKUP" "$CHGTEST"
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    # filemerge prefers the right by default
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    $FILEMERGE -left "$OTHER" -right "$LOCAL" -ancestor "$BASE" -merge "$LOCAL"
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    [ $? -ne 0 ] && echo "FileMerge failed to launch" && failure
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    test "$LOCAL" -nt "$CHGTEST" && success || ask_if_merged
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fi
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if [ -n "$DISPLAY" ]; then
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    # try using kdiff3, which is fairly nice
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    if [ -n "$KDIFF3" ]; then
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        $KDIFF3 --auto "$BASE" "$BACKUP" "$OTHER" -o "$LOCAL" || failure
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        success
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    fi
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    # try using tkdiff, which is a bit less sophisticated
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    if [ -n "$TKDIFF" ]; then
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        $TKDIFF "$BACKUP" "$OTHER" -a "$BASE" -o "$LOCAL" || failure
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        success
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    fi
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    if [ -n "$MELD" ]; then
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        cp "$BACKUP" "$CHGTEST"
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        # protect our feet - meld allows us to save to the left file
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        cp "$BACKUP" "$LOCAL.tmp.$RAND"
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        # Meld doesn't have automatic merging, so to reduce intervention
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        # use the file with conflicts
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        $MELD "$LOCAL.tmp.$RAND" "$LOCAL" "$OTHER" || failure
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        # Also it doesn't return good error code
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        test "$LOCAL" -nt "$CHGTEST" && success || ask_if_merged
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    fi
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fi
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# Attempt to do a merge with $EDITOR
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if [ -n "$MERGE" -o -n "$DIFF3" ]; then
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    echo "conflicts detected in $LOCAL"
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    cp "$BACKUP" "$CHGTEST"
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    $EDITOR "$LOCAL" || failure
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    # Some editors do not return meaningful error codes
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    # Do not take any chances
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    test "$LOCAL" -nt "$CHGTEST" && success || ask_if_merged
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fi
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# attempt to manually merge with diff and patch
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if [ -n "$DIFF" -a -n "$PATCH" ]; then
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    (umask 077 && mkdir "$HGTMP") || {
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        echo "Could not create temporary directory $HGTMP" 1>&2
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        failure
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    }
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    $DIFF -u "$BASE" "$OTHER" > "$HGTMP/diff" || :
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    if $PATCH "$LOCAL" < "$HGTMP/diff"; then
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        success
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    else
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        # If rejects are empty after using the editor, merge was ok
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        $EDITOR "$LOCAL" "$LOCAL.rej" || failure
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        test -s "$LOCAL.rej" || success
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    fi
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    failure
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fi
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echo
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echo "hgmerge: unable to find any merge utility!"
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echo "supported programs:"
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echo "merge, FileMerge, tkdiff, kdiff3, meld, diff+patch"
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echo
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failure