annotate hgmerge @ 1434:696851b1bba9

Fix use of diff(1) triggered by set -e. Search harder for a decent diff/patch to use.
author levon@movementarian.org
date Mon, 24 Oct 2005 14:55:53 -0700
parents 9c918287d10b
children 64a1169c927d
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1 #!/bin/sh
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2 #
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3 # hgmerge - default merge helper for Mercurial
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4 #
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5 # This tries to find a way to do three-way merge on the current system.
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6 # The result ought to end up in $1.
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7
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8 set -e # bail out quickly on failure
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9
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10 LOCAL="$1"
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11 BASE="$2"
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12 OTHER="$3"
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13
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14 if [ -z "$EDITOR" ]; then
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15 EDITOR="vi"
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16 fi
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17
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18 # find decent versions of our utilities, insisting on the GNU versions where we
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19 # need to
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20 DIFF3=gdiff3
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21 DIFF=gdiff
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22 PATCH=gpatch
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23
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24 type $DIFF3 >/dev/null 2>&1 || DIFF3=diff3
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25 type $DIFF >/dev/null 2>&1 || DIFF=diff
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26 type $PATCH >/dev/null 2>&1 || PATCH=patch
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27 $DIFF3 --version >/dev/null 2>&1 || DIFF3=
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28
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29 # Back up our file
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30 cp "$LOCAL" "$LOCAL.orig"
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31
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32 # Attempt to do a non-interactive merge
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33 if type merge > /dev/null 2>&1; then
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34 merge "$LOCAL" "$BASE" "$OTHER" 2> /dev/null && exit 0
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35 cp "$LOCAL.orig" "$LOCAL"
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36 elif [ -n "$DIFF3" ]; then
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37 echo $DIFF3 -m "$LOCAL.orig" "$BASE" "$OTHER"
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38 $DIFF3 -m "$LOCAL.orig" "$BASE" "$OTHER" > "$LOCAL" && exit 0
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39 if [ $? -eq 2 ]; then
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40 echo "$DIFF3 failed! Exiting." 1>&2
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41 cp "$LOCAL.orig" "$LOCAL"
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42 exit 1
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43 fi
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44 cp "$LOCAL.orig" "$LOCAL"
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45 fi
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46
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47 if [ -n "$DISPLAY" ]; then
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48 # try using kdiff3, which is fairly nice
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49 if type kdiff3 > /dev/null 2>&1; then
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50 kdiff3 --auto "$BASE" "$LOCAL" "$OTHER" -o "$LOCAL" || exit 1
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51 exit 0
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52 fi
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53
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54 # try using tkdiff, which is a bit less sophisticated
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55 if type tkdiff > /dev/null 2>&1; then
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56 tkdiff "$LOCAL" "$OTHER" -a "$BASE" -o "$LOCAL" || exit 1
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57 exit 0
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58 fi
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59 fi
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60
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61 # Attempt to do a merge with $EDITOR
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62 if type merge > /dev/null 2>&1; then
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63 echo "conflicts detected in $LOCAL"
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64 merge "$LOCAL" "$BASE" "$OTHER" 2>/dev/null || $EDITOR "$LOCAL"
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65 exit 0
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66 fi
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67
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68 if [ -n "$DIFF3" ]; then
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69 echo "conflicts detected in $LOCAL"
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70 $DIFF3 -m "$LOCAL.orig" "$BASE" "$OTHER" > "$LOCAL" || {
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71 case $? in
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72 1)
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73 $EDITOR "$LOCAL" ;;
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74 2) echo "$DIFF3 failed! Exiting." 1>&2
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75 cp "$LOCAL.orig" "$LOCAL"
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76 exit 1 ;;
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77 esac
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78 exit 0
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79 }
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80 fi
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81
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82 HGTMP=""
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83 cleanup_exit() {
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84 rm -rf "$HGTMP"
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85 }
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86
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87 # attempt to manually merge with diff and patch
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88 if [ -n "$DIFF" -a -n "$PATCH" ]; then
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89 # Remove temporary files even if we get interrupted
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90 trap "cleanup_exit" 0 # normal exit
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91 trap "exit 1" 1 2 3 6 15 # HUP INT QUIT ABRT TERM
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92
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93 HGTMP="${TMPDIR-/tmp}/hgmerge.$RANDOM.$RANDOM.$RANDOM.$$"
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94 (umask 077 && mkdir "$HGTMP") || {
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95 echo "Could not create temporary directory! Exiting." 1>&2
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96 exit 1
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97 }
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98
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99 $DIFF -u "$BASE" "$OTHER" > "$HGTMP/diff" || :
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100 if $PATCH "$LOCAL" < "$HGTMP/diff"; then
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101 exit 0
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102 else
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103 # If rejects are empty after using the editor, merge was ok
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104 $EDITOR "$LOCAL" "$LOCAL.rej" && test -s "$LOCAL.rej" || exit 0
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105 fi
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106 exit 1
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107 fi
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108
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109 echo "hgmerge: unable to find merge, tkdiff, kdiff3, or diff+patch!"
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110 exit 1