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# 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 scriptname do setup_tool "$scriptname" 2>/dev/null # We need an actual line feed here variants="$variants $(list_tool_variants)" done variants="$(echo "$variants" | sort -u)" for toolname in $variants do if setup_tool "$toolname" 2>/dev/null && (eval "$condition" "$toolname") then if test -n "$preamble" then printf "%s\n" "$preamble" preamble= fi shown_any=yes printf "%s%-15s %s\n" "$per_line_prefix" "$toolname" $(diff_mode && diff_cmd_help "$toolname" || merge_cmd_help "$toolname") fi done if test -n "$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 "$TOOL_MODE" = merge } get_gui_default () { if diff_mode then GUI_DEFAULT_KEY="difftool.guiDefault" else GUI_DEFAULT_KEY="mergetool.guiDefault" fi GUI_DEFAULT_CONFIG_LCASE=$(git config --default false --get "$GUI_DEFAULT_KEY" | tr 'A-Z' 'a-z') if test "$GUI_DEFAULT_CONFIG_LCASE" = "auto" then if test -n "$DISPLAY" then GUI_DEFAULT=true else GUI_DEFAULT=false fi else GUI_DEFAULT=$(git config --default false --bool --get "$GUI_DEFAULT_KEY") subshell_exit_status=$? if test $subshell_exit_status -ne 0 then exit $subshell_exit_status fi fi echo $GUI_DEFAULT } gui_mode () { if test -z "$GIT_MERGETOOL_GUI" then GIT_MERGETOOL_GUI=$(get_gui_default) if test $? -ne 0 then exit 2 fi fi test "$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 $merge_tool_cmd ) } list_tool_variants () { echo "$tool" } } setup_tool () { tool="$1" # Fallback definitions, to be overridden by tools. can_merge () { return 0 } can_diff () { return 0 } diff_cmd () { return 1 } diff_cmd_help () { return 0 } merge_cmd () { return 1 } merge_cmd_help () { return 0 } hide_resolved_enabled () { return 0 } translate_merge_tool_path () { echo "$1" } list_tool_variants () { echo "$tool" } # 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 . "$MERGE_TOOLS_DIR/$tool" elif test -f "$MERGE_TOOLS_DIR/${tool%[0-9]}" then . "$MERGE_TOOLS_DIR/${tool%[0-9]}" else setup_user_tool return $? fi # Now let the user override the default command for the tool. If # they have not done so then this will return 1 which we ignore. setup_user_tool if ! list_tool_variants | grep -q "^$tool$" then return 1 fi if merge_mode && ! can_merge then echo "error: '$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 } initialize_merge_tool () { # Bring tool-specific functions into scope setup_tool "$1" || return 1 } # Entry point for running tools run_merge_tool () { # If GIT_PREFIX is empty then we cannot use it in tools # that expect to be able to chdir() to its value. GIT_PREFIX=${GIT_PREFIX:-.} export GIT_PREFIX merge_tool_path=$(get_merge_tool_path "$1") || exit base_present="$2" 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 *nvim*) tools="$tools nvimdiff vimdiff emerge" ;; *vim*) tools="$tools vimdiff nvimdiff emerge" ;; *) tools="$tools emerge vimdiff nvimdiff" ;; 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) subshell_exit_status=$? if test $subshell_exit_status -gt "1" then exit $subshell_exit_status fi # Try to guess an appropriate merge tool if no tool has been set. if test -z "$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" }