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 diffmerge ecmerge"
 254                 tools="$tools p4merge araxis bc3 codecompare"
 255         fi
 256         case "${VISUAL:-$EDITOR}" in
 257         *vim*)
 258                 tools="$tools vimdiff emerge"
 259                 ;;
 260         *)
 261                 tools="$tools emerge vimdiff"
 262                 ;;
 263         esac
 264 }
 265
 266 show_tool_help () {
 267         tool_opt="'git ${TOOL_MODE}tool --tool=<tool>'"
 268
 269         tab='   '
 270         LF='
 271 '
 272         any_shown=no
 273
 274         cmd_name=${TOOL_MODE}tool
 275         config_tools=$({
 276                 diff_mode && list_config_tools difftool "$tab$tab"
 277                 list_config_tools mergetool "$tab$tab"
 278         } | sort)
 279         extra_content=
 280         if test -n "$config_tools"
 281         then
 282                 extra_content="${tab}user-defined:${LF}$config_tools"
 283         fi
 284
 285         show_tool_names 'mode_ok && is_available' "$tab$tab" \
 286                 "$tool_opt may be set to one of the following:" \
 287                 "No suitable tool for 'git $cmd_name --tool=<tool>' found." \
 288                 "$extra_content" &&
 289                 any_shown=yes
 290
 291         show_tool_names 'mode_ok && ! is_available' "$tab$tab" \
 292                 "${LF}The following tools are valid, but not currently available:" &&
 293                 any_shown=yes
 294
 295         if test "$any_shown" = yes
 296         then
 297                 echo
 298                 echo "Some of the tools listed above only work in a windowed"
 299                 echo "environment. If run in a terminal-only session, they will fail."
 300         fi
 301         exit 0
 302 }
 303
 304 guess_merge_tool () {
 305         list_merge_tool_candidates
 306         cat >&2 <<-EOF
 307
 308         This message is displayed because '$TOOL_MODE.tool' is not configured.
 309         See 'git ${TOOL_MODE}tool --tool-help' or 'git help config' for more details.
 310         'git ${TOOL_MODE}tool' will now attempt to use one of the following tools:
 311         $tools
 312         EOF
 313
 314         # Loop over each candidate and stop when a valid merge tool is found.
 315         for tool in $tools
 316         do
 317                 is_available "$tool" && echo "$tool" && return 0
 318         done
 319
 320         echo >&2 "No known ${TOOL_MODE} tool is available."
 321         return 1
 322 }
 323
 324 get_configured_merge_tool () {
 325         # Diff mode first tries diff.tool and falls back to merge.tool.
 326         # Merge mode only checks merge.tool
 327         if diff_mode
 328         then
 329                 merge_tool=$(git config diff.tool || git config merge.tool)
 330         else
 331                 merge_tool=$(git config merge.tool)
 332         fi
 333         if test -n "$merge_tool" && ! valid_tool "$merge_tool"
 334         then
 335                 echo >&2 "git config option $TOOL_MODE.tool set to unknown tool: $merge_tool"
 336                 echo >&2 "Resetting to default..."
 337                 return 1
 338         fi
 339         echo "$merge_tool"
 340 }
 341
 342 get_merge_tool_path () {
 343         # A merge tool has been set, so verify that it's valid.
 344         merge_tool="$1"
 345         if ! valid_tool "$merge_tool"
 346         then
 347                 echo >&2 "Unknown merge tool $merge_tool"
 348                 exit 1
 349         fi
 350         if diff_mode
 351         then
 352                 merge_tool_path=$(git config difftool."$merge_tool".path ||
 353                                   git config mergetool."$merge_tool".path)
 354         else
 355                 merge_tool_path=$(git config mergetool."$merge_tool".path)
 356         fi
 357         if test -z "$merge_tool_path"
 358         then
 359                 merge_tool_path=$(translate_merge_tool_path "$merge_tool")
 360         fi
 361         if test -z "$(get_merge_tool_cmd "$merge_tool")" &&
 362                 ! type "$merge_tool_path" >/dev/null 2>&1
 363         then
 364                 echo >&2 "The $TOOL_MODE tool $merge_tool is not available as"\
 365                          "'$merge_tool_path'"
 366                 exit 1
 367         fi
 368         echo "$merge_tool_path"
 369 }
 370
 371 get_merge_tool () {
 372         # Check if a merge tool has been configured
 373         merge_tool=$(get_configured_merge_tool)
 374         # Try to guess an appropriate merge tool if no tool has been set.
 375         if test -z "$merge_tool"
 376         then
 377                 merge_tool=$(guess_merge_tool) || exit
 378         fi
 379         echo "$merge_tool"
 380 }