git-mergetool--lib.sh

   1 #!/bin/sh
   2 # git-mergetool--lib is a library for common merge tool functions
   3
   4 : ${MERGE_TOOLS_DIR=$(git --exec-path)/mergetools}
   5
   6 mode_ok () {
   7         if diff_mode
   8         then
   9                 can_diff
  10         elif merge_mode
  11         then
  12                 can_merge
  13         else
  14                 false
  15         fi
  16 }
  17
  18 is_available () {
  19         merge_tool_path=$(translate_merge_tool_path "$1") &&
  20         type "$merge_tool_path" >/dev/null 2>&1
  21 }
  22
  23 list_config_tools () {
  24         section=$1
  25         line_prefix=${2:-}
  26
  27         git config --get-regexp $section'\..*\.cmd' |
  28         while read -r key value
  29         do
  30                 toolname=${key#$section.}
  31                 toolname=${toolname%.cmd}
  32
  33                 printf "%s%s\n" "$line_prefix" "$toolname"
  34         done
  35 }
  36
  37 show_tool_names () {
  38         condition=${1:-true} per_line_prefix=${2:-} preamble=${3:-}
  39         not_found_msg=${4:-}
  40         extra_content=${5:-}
  41
  42         shown_any=
  43         ( cd "$MERGE_TOOLS_DIR" && ls ) | {
  44                 while read toolname
  45                 do
  46                         if setup_tool "$toolname" 2>/dev/null &&
  47                                 (eval "$condition" "$toolname")
  48                         then
  49                                 if test -n "$preamble"
  50                                 then
  51                                         printf "%s\n" "$preamble"
  52                                         preamble=
  53                                 fi
  54                                 shown_any=yes
  55                                 printf "%s%s\n" "$per_line_prefix" "$toolname"
  56                         fi
  57                 done
  58
  59                 if test -n "$extra_content"
  60                 then
  61                         if test -n "$preamble"
  62                         then
  63                                 # Note: no '\n' here since we don't want a
  64                                 # blank line if there is no initial content.
  65                                 printf "%s" "$preamble"
  66                                 preamble=
  67                         fi
  68                         shown_any=yes
  69                         printf "\n%s\n" "$extra_content"
  70                 fi
  71
  72                 if test -n "$preamble" && test -n "$not_found_msg"
  73                 then
  74                         printf "%s\n" "$not_found_msg"
  75                 fi
  76
  77                 test -n "$shown_any"
  78         }
  79 }
  80
  81 diff_mode() {
  82         test "$TOOL_MODE" = diff
  83 }
  84
  85 merge_mode() {
  86         test "$TOOL_MODE" = merge
  87 }
  88
  89 translate_merge_tool_path () {
  90         echo "$1"
  91 }
  92
  93 check_unchanged () {
  94         if test "$MERGED" -nt "$BACKUP"
  95         then
  96                 status=0
  97         else
  98                 while true
  99                 do
 100                         echo "$MERGED seems unchanged."
 101                         printf "Was the merge successful? [y/n] "
 102                         read answer || return 1
 103                         case "$answer" in
 104                         y*|Y*) status=0; break ;;
 105                         n*|N*) status=1; break ;;
 106                         esac
 107                 done
 108         fi
 109 }
 110
 111 valid_tool () {
 112         setup_tool "$1" && return 0
 113         cmd=$(get_merge_tool_cmd "$1")
 114         test -n "$cmd"
 115 }
 116
 117 setup_user_tool () {
 118         merge_tool_cmd=$(get_merge_tool_cmd "$tool")
 119         test -n "$merge_tool_cmd" || return 1
 120
 121         diff_cmd () {
 122                 ( eval $merge_tool_cmd )
 123                 status=$?
 124                 return $status
 125         }
 126
 127         merge_cmd () {
 128                 trust_exit_code=$(git config --bool \
 129                         "mergetool.$1.trustExitCode" || echo false)
 130                 if test "$trust_exit_code" = "false"
 131                 then
 132                         touch "$BACKUP"
 133                         ( eval $merge_tool_cmd )
 134                         status=$?
 135                         check_unchanged
 136                 else
 137                         ( eval $merge_tool_cmd )
 138                         status=$?
 139                 fi
 140                 return $status
 141         }
 142 }
 143
 144 setup_tool () {
 145         tool="$1"
 146
 147         # Fallback definitions, to be overridden by tools.
 148         can_merge () {
 149                 return 0
 150         }
 151
 152         can_diff () {
 153                 return 0
 154         }
 155
 156         diff_cmd () {
 157                 status=1
 158                 return $status
 159         }
 160
 161         merge_cmd () {
 162                 status=1
 163                 return $status
 164         }
 165
 166         translate_merge_tool_path () {
 167                 echo "$1"
 168         }
 169
 170         if ! test -f "$MERGE_TOOLS_DIR/$tool"
 171         then
 172                 setup_user_tool
 173                 return $?
 174         fi
 175
 176         # Load the redefined functions
 177         . "$MERGE_TOOLS_DIR/$tool"
 178         # Now let the user override the default command for the tool.  If
 179         # they have not done so then this will return 1 which we ignore.
 180         setup_user_tool
 181
 182         if merge_mode && ! can_merge
 183         then
 184                 echo "error: '$tool' can not be used to resolve merges" >&2
 185                 return 1
 186         elif diff_mode && ! can_diff
 187         then
 188                 echo "error: '$tool' can only be used to resolve merges" >&2
 189                 return 1
 190         fi
 191         return 0
 192 }
 193
 194 get_merge_tool_cmd () {
 195         merge_tool="$1"
 196         if diff_mode
 197         then
 198                 git config "difftool.$merge_tool.cmd" ||
 199                 git config "mergetool.$merge_tool.cmd"
 200         else
 201                 git config "mergetool.$merge_tool.cmd"
 202         fi
 203 }
 204
 205 # Entry point for running tools
 206 run_merge_tool () {
 207         # If GIT_PREFIX is empty then we cannot use it in tools
 208         # that expect to be able to chdir() to its value.
 209         GIT_PREFIX=${GIT_PREFIX:-.}
 210         export GIT_PREFIX
 211
 212         merge_tool_path=$(get_merge_tool_path "$1") || exit
 213         base_present="$2"
 214         status=0
 215
 216         # Bring tool-specific functions into scope
 217         setup_tool "$1" || return 1
 218
 219         if merge_mode
 220         then
 221                 run_merge_cmd "$1"
 222         else
 223                 run_diff_cmd "$1"
 224         fi
 225         return $status
 226 }
 227
 228 # Run a either a configured or built-in diff tool
 229 run_diff_cmd () {
 230         diff_cmd "$1"
 231 }
 232
 233 # Run a either a configured or built-in merge tool
 234 run_merge_cmd () {
 235         merge_cmd "$1"
 236 }
 237
 238 list_merge_tool_candidates () {
 239         if merge_mode
 240         then
 241                 tools="tortoisemerge"
 242         else
 243                 tools="kompare"
 244         fi
 245         if test -n "$DISPLAY"
 246         then
 247                 if test -n "$GNOME_DESKTOP_SESSION_ID"
 248                 then
 249                         tools="meld opendiff kdiff3 tkdiff xxdiff $tools"
 250                 else
 251                         tools="opendiff kdiff3 tkdiff xxdiff meld $tools"
 252                 fi
 253                 tools="$tools gvimdiff diffuse ecmerge p4merge araxis bc3 codecompare"
 254         fi
 255         case "${VISUAL:-$EDITOR}" in
 256         *vim*)
 257                 tools="$tools vimdiff emerge"
 258                 ;;
 259         *)
 260                 tools="$tools emerge vimdiff"
 261                 ;;
 262         esac
 263 }
 264
 265 show_tool_help () {
 266         tool_opt="'git ${TOOL_MODE}tool --tool-<tool>'"
 267
 268         tab='   '
 269         LF='
 270 '
 271         any_shown=no
 272
 273         cmd_name=${TOOL_MODE}tool
 274         config_tools=$({
 275                 diff_mode && list_config_tools difftool "$tab$tab"
 276                 list_config_tools mergetool "$tab$tab"
 277         } | sort)
 278         extra_content=
 279         if test -n "$config_tools"
 280         then
 281                 extra_content="${tab}user-defined:${LF}$config_tools"
 282         fi
 283
 284         show_tool_names 'mode_ok && is_available' "$tab$tab" \
 285                 "$tool_opt may be set to one of the following:" \
 286                 "No suitable tool for 'git $cmd_name --tool=<tool>' found." \
 287                 "$extra_content" &&
 288                 any_shown=yes
 289
 290         show_tool_names 'mode_ok && ! is_available' "$tab$tab" \
 291                 "${LF}The following tools are valid, but not currently available:" &&
 292                 any_shown=yes
 293
 294         if test "$any_shown" = yes
 295         then
 296                 echo
 297                 echo "Some of the tools listed above only work in a windowed"
 298                 echo "environment. If run in a terminal-only session, they will fail."
 299         fi
 300         exit 0
 301 }
 302
 303 guess_merge_tool () {
 304         list_merge_tool_candidates
 305         cat >&2 <<-EOF
 306
 307         This message is displayed because '$TOOL_MODE.tool' is not configured.
 308         See 'git ${TOOL_MODE}tool --tool-help' or 'git help config' for more details.
 309         'git ${TOOL_MODE}tool' will now attempt to use one of the following tools:
 310         $tools
 311         EOF
 312
 313         # Loop over each candidate and stop when a valid merge tool is found.
 314         for tool in $tools
 315         do
 316                 is_available "$tool" && echo "$tool" && return 0
 317         done
 318
 319         echo >&2 "No known ${TOOL_MODE} tool is available."
 320         return 1
 321 }
 322
 323 get_configured_merge_tool () {
 324         # Diff mode first tries diff.tool and falls back to merge.tool.
 325         # Merge mode only checks merge.tool
 326         if diff_mode
 327         then
 328                 merge_tool=$(git config diff.tool || git config merge.tool)
 329         else
 330                 merge_tool=$(git config merge.tool)
 331         fi
 332         if test -n "$merge_tool" && ! valid_tool "$merge_tool"
 333         then
 334                 echo >&2 "git config option $TOOL_MODE.tool set to unknown tool: $merge_tool"
 335                 echo >&2 "Resetting to default..."
 336                 return 1
 337         fi
 338         echo "$merge_tool"
 339 }
 340
 341 get_merge_tool_path () {
 342         # A merge tool has been set, so verify that it's valid.
 343         merge_tool="$1"
 344         if ! valid_tool "$merge_tool"
 345         then
 346                 echo >&2 "Unknown merge tool $merge_tool"
 347                 exit 1
 348         fi
 349         if diff_mode
 350         then
 351                 merge_tool_path=$(git config difftool."$merge_tool".path ||
 352                                   git config mergetool."$merge_tool".path)
 353         else
 354                 merge_tool_path=$(git config mergetool."$merge_tool".path)
 355         fi
 356         if test -z "$merge_tool_path"
 357         then
 358                 merge_tool_path=$(translate_merge_tool_path "$merge_tool")
 359         fi
 360         if test -z "$(get_merge_tool_cmd "$merge_tool")" &&
 361                 ! type "$merge_tool_path" >/dev/null 2>&1
 362         then
 363                 echo >&2 "The $TOOL_MODE tool $merge_tool is not available as"\
 364                          "'$merge_tool_path'"
 365                 exit 1
 366         fi
 367         echo "$merge_tool_path"
 368 }
 369
 370 get_merge_tool () {
 371         # Check if a merge tool has been configured
 372         merge_tool=$(get_configured_merge_tool)
 373         # Try to guess an appropriate merge tool if no tool has been set.
 374         if test -z "$merge_tool"
 375         then
 376                 merge_tool=$(guess_merge_tool) || exit
 377         fi
 378         echo "$merge_tool"
 379 }