diff options
Diffstat (limited to 'third_party/git/git-mergetool--lib.sh')
| -rw-r--r-- | third_party/git/git-mergetool--lib.sh | 463 |
1 files changed, 463 insertions, 0 deletions
diff --git a/third_party/git/git-mergetool--lib.sh b/third_party/git/git-mergetool--lib.sh new file mode 100644 index 0000000000..204a5acd66 --- /dev/null +++ b/third_party/git/git-mergetool--lib.sh @@ -0,0 +1,463 @@ +# git-mergetool--lib is a shell library for common merge tool functions + +: ${MERGE_TOOLS_DIR=$(git --exec-path)/mergetools} + +IFS=' +' + +mode_ok () { + if diff_mode + then + can_diff + elif merge_mode + then + can_merge + else + false + fi +} + +is_available () { + merge_tool_path=$(translate_merge_tool_path "$1") && + type "$merge_tool_path" >/dev/null 2>&1 +} + +list_config_tools () { + section=$1 + line_prefix=${2:-} + + git config --get-regexp $section'\..*\.cmd' | + while read -r key value + do + toolname=${key#$section.} + toolname=${toolname%.cmd} + + printf "%s%s\n" "$line_prefix" "$toolname" + done +} + +show_tool_names () { + condition=${1:-true} per_line_prefix=${2:-} preamble=${3:-} + not_found_msg=${4:-} + extra_content=${5:-} + + shown_any= + ( cd "$MERGE_TOOLS_DIR" && ls ) | { + while read toolname + do + if setup_tool "$toolname" 2>/dev/null && + (eval "$condition" "$toolname") + then + if test -n "$preamble" + then + printf "%s\n" "$preamble" + preamble= + fi + shown_any=yes + printf "%s%s\n" "$per_line_prefix" "$toolname" + fi + done + + if test -n "$extra_content" + then + if test -n "$preamble" + then + # Note: no '\n' here since we don't want a + # blank line if there is no initial content. + printf "%s" "$preamble" + preamble= + fi + shown_any=yes + printf "\n%s\n" "$extra_content" + fi + + if test -n "$preamble" && test -n "$not_found_msg" + then + printf "%s\n" "$not_found_msg" + fi + + test -n "$shown_any" + } +} + +diff_mode () { + test "$TOOL_MODE" = diff +} + +merge_mode () { + test "$TOOL_MODE" = merge +} + +gui_mode () { + test "$GIT_MERGETOOL_GUI" = true +} + +translate_merge_tool_path () { + echo "$1" +} + +check_unchanged () { + if test "$MERGED" -nt "$BACKUP" + then + return 0 + else + while true + do + echo "$MERGED seems unchanged." + printf "Was the merge successful [y/n]? " + read answer || return 1 + case "$answer" in + y*|Y*) return 0 ;; + n*|N*) return 1 ;; + esac + done + fi +} + +valid_tool () { + setup_tool "$1" && return 0 + cmd=$(get_merge_tool_cmd "$1") + test -n "$cmd" +} + +setup_user_tool () { + merge_tool_cmd=$(get_merge_tool_cmd "$tool") + test -n "$merge_tool_cmd" || return 1 + + diff_cmd () { + ( eval $merge_tool_cmd ) + } + + merge_cmd () { + ( eval $merge_tool_cmd ) + } +} + +setup_tool () { + tool="$1" + + # Fallback definitions, to be overridden by tools. + can_merge () { + return 0 + } + + can_diff () { + return 0 + } + + diff_cmd () { + return 1 + } + + merge_cmd () { + return 1 + } + + translate_merge_tool_path () { + echo "$1" + } + + # Most tools' exit codes cannot be trusted, so By default we ignore + # their exit code and check the merged file's modification time in + # check_unchanged() to determine whether or not the merge was + # successful. The return value from run_merge_cmd, by default, is + # determined by check_unchanged(). + # + # When a tool's exit code can be trusted then the return value from + # run_merge_cmd is simply the tool's exit code, and check_unchanged() + # is not called. + # + # The return value of exit_code_trustable() tells us whether or not we + # can trust the tool's exit code. + # + # User-defined and built-in tools default to false. + # Built-in tools advertise that their exit code is trustable by + # redefining exit_code_trustable() to true. + + exit_code_trustable () { + false + } + + + if ! test -f "$MERGE_TOOLS_DIR/$tool" + then + setup_user_tool + return $? + fi + + # Load the redefined functions + . "$MERGE_TOOLS_DIR/$tool" + # Now let the user override the default command for the tool. If + # they have not done so then this will return 1 which we ignore. + setup_user_tool + + if merge_mode && ! can_merge + then + echo "error: '$tool' can not be used to resolve merges" >&2 + return 1 + elif diff_mode && ! can_diff + then + echo "error: '$tool' can only be used to resolve merges" >&2 + return 1 + fi + return 0 +} + +get_merge_tool_cmd () { + merge_tool="$1" + if diff_mode + then + git config "difftool.$merge_tool.cmd" || + git config "mergetool.$merge_tool.cmd" + else + git config "mergetool.$merge_tool.cmd" + fi +} + +trust_exit_code () { + if git config --bool "mergetool.$1.trustExitCode" + then + :; # OK + elif exit_code_trustable + then + echo true + else + echo false + fi +} + + +# Entry point for running tools +run_merge_tool () { + # If GIT_PREFIX is empty then we cannot use it in tools + # that expect to be able to chdir() to its value. + GIT_PREFIX=${GIT_PREFIX:-.} + export GIT_PREFIX + + merge_tool_path=$(get_merge_tool_path "$1") || exit + base_present="$2" + + # Bring tool-specific functions into scope + setup_tool "$1" || return 1 + + if merge_mode + then + run_merge_cmd "$1" + else + run_diff_cmd "$1" + fi +} + +# Run a either a configured or built-in diff tool +run_diff_cmd () { + diff_cmd "$1" +} + +# Run a either a configured or built-in merge tool +run_merge_cmd () { + mergetool_trust_exit_code=$(trust_exit_code "$1") + if test "$mergetool_trust_exit_code" = "true" + then + merge_cmd "$1" + else + touch "$BACKUP" + merge_cmd "$1" + check_unchanged + fi +} + +list_merge_tool_candidates () { + if merge_mode + then + tools="tortoisemerge" + else + tools="kompare" + fi + if test -n "$DISPLAY" + then + if test -n "$GNOME_DESKTOP_SESSION_ID" + then + tools="meld opendiff kdiff3 tkdiff xxdiff $tools" + else + tools="opendiff kdiff3 tkdiff xxdiff meld $tools" + fi + tools="$tools gvimdiff diffuse diffmerge ecmerge" + tools="$tools p4merge araxis bc codecompare" + tools="$tools smerge" + fi + case "${VISUAL:-$EDITOR}" in + *vim*) + tools="$tools vimdiff emerge" + ;; + *) + tools="$tools emerge vimdiff" + ;; + esac +} + +show_tool_help () { + tool_opt="'git ${TOOL_MODE}tool --tool=<tool>'" + + tab=' ' + LF=' +' + any_shown=no + + cmd_name=${TOOL_MODE}tool + config_tools=$({ + diff_mode && list_config_tools difftool "$tab$tab" + list_config_tools mergetool "$tab$tab" + } | sort) + extra_content= + if test -n "$config_tools" + then + extra_content="${tab}user-defined:${LF}$config_tools" + fi + + show_tool_names 'mode_ok && is_available' "$tab$tab" \ + "$tool_opt may be set to one of the following:" \ + "No suitable tool for 'git $cmd_name --tool=<tool>' found." \ + "$extra_content" && + any_shown=yes + + show_tool_names 'mode_ok && ! is_available' "$tab$tab" \ + "${LF}The following tools are valid, but not currently available:" && + any_shown=yes + + if test "$any_shown" = yes + then + echo + echo "Some of the tools listed above only work in a windowed" + echo "environment. If run in a terminal-only session, they will fail." + fi + exit 0 +} + +guess_merge_tool () { + list_merge_tool_candidates + cat >&2 <<-EOF + + This message is displayed because '$TOOL_MODE.tool' is not configured. + See 'git ${TOOL_MODE}tool --tool-help' or 'git help config' for more details. + 'git ${TOOL_MODE}tool' will now attempt to use one of the following tools: + $tools + EOF + + # Loop over each candidate and stop when a valid merge tool is found. + IFS=' ' + for tool in $tools + do + is_available "$tool" && echo "$tool" && return 0 + done + + echo >&2 "No known ${TOOL_MODE} tool is available." + return 1 +} + +get_configured_merge_tool () { + keys= + if diff_mode + then + if gui_mode + then + keys="diff.guitool merge.guitool diff.tool merge.tool" + else + keys="diff.tool merge.tool" + fi + else + if gui_mode + then + keys="merge.guitool merge.tool" + else + keys="merge.tool" + fi + fi + + merge_tool=$( + IFS=' ' + for key in $keys + do + selected=$(git config $key) + if test -n "$selected" + then + echo "$selected" + return + fi + done) + + if test -n "$merge_tool" && ! valid_tool "$merge_tool" + then + echo >&2 "git config option $TOOL_MODE.${gui_prefix}tool set to unknown tool: $merge_tool" + echo >&2 "Resetting to default..." + return 1 + fi + echo "$merge_tool" +} + +get_merge_tool_path () { + # A merge tool has been set, so verify that it's valid. + merge_tool="$1" + if ! valid_tool "$merge_tool" + then + echo >&2 "Unknown merge tool $merge_tool" + exit 1 + fi + if diff_mode + then + merge_tool_path=$(git config difftool."$merge_tool".path || + git config mergetool."$merge_tool".path) + else + merge_tool_path=$(git config mergetool."$merge_tool".path) + fi + if test -z "$merge_tool_path" + then + merge_tool_path=$(translate_merge_tool_path "$merge_tool") + fi + if test -z "$(get_merge_tool_cmd "$merge_tool")" && + ! type "$merge_tool_path" >/dev/null 2>&1 + then + echo >&2 "The $TOOL_MODE tool $merge_tool is not available as"\ + "'$merge_tool_path'" + exit 1 + fi + echo "$merge_tool_path" +} + +get_merge_tool () { + is_guessed=false + # Check if a merge tool has been configured + merge_tool=$(get_configured_merge_tool) + # Try to guess an appropriate merge tool if no tool has been set. + if test -z "$merge_tool" + then + merge_tool=$(guess_merge_tool) || exit + is_guessed=true + fi + echo "$merge_tool" + test "$is_guessed" = false +} + +mergetool_find_win32_cmd () { + executable=$1 + sub_directory=$2 + + # Use $executable if it exists in $PATH + if type -p "$executable" >/dev/null 2>&1 + then + printf '%s' "$executable" + return + fi + + # Look for executable in the typical locations + for directory in $(env | grep -Ei '^PROGRAM(FILES(\(X86\))?|W6432)=' | + cut -d '=' -f 2- | sort -u) + do + if test -n "$directory" && test -x "$directory/$sub_directory/$executable" + then + printf '%s' "$directory/$sub_directory/$executable" + return + fi + done + + printf '%s' "$executable" +} |