544 lines
10 KiB
Bash
544 lines
10 KiB
Bash
# git-mergetool--lib is a shell library for common merge tool functions
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: ${MERGE_TOOLS_DIR=$(git --exec-path)/mergetools}
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IFS='
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'
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mode_ok () {
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if diff_mode
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then
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can_diff
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elif merge_mode
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then
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can_merge
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else
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false
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fi
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}
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is_available () {
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merge_tool_path=$(translate_merge_tool_path "$1") &&
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type "$merge_tool_path" >/dev/null 2>&1
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}
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list_config_tools () {
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section=$1
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line_prefix=${2:-}
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git config --get-regexp $section'\..*\.cmd' |
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while read -r key value
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do
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toolname=${key#$section.}
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toolname=${toolname%.cmd}
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printf "%s%s\n" "$line_prefix" "$toolname"
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done
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}
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show_tool_names () {
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condition=${1:-true} per_line_prefix=${2:-} preamble=${3:-}
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not_found_msg=${4:-}
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extra_content=${5:-}
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shown_any=
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( cd "$MERGE_TOOLS_DIR" && ls ) | {
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while read scriptname
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do
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setup_tool "$scriptname" 2>/dev/null
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# We need an actual line feed here
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variants="$variants
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$(list_tool_variants)"
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done
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variants="$(echo "$variants" | sort -u)"
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for toolname in $variants
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do
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if setup_tool "$toolname" 2>/dev/null &&
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(eval "$condition" "$toolname")
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then
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if test -n "$preamble"
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then
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printf "%s\n" "$preamble"
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preamble=
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fi
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shown_any=yes
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printf "%s%-15s %s\n" "$per_line_prefix" "$toolname" $(diff_mode && diff_cmd_help "$toolname" || merge_cmd_help "$toolname")
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fi
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done
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if test -n "$extra_content"
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then
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if test -n "$preamble"
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then
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# Note: no '\n' here since we don't want a
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# blank line if there is no initial content.
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printf "%s" "$preamble"
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preamble=
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fi
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shown_any=yes
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printf "\n%s\n" "$extra_content"
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fi
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if test -n "$preamble" && test -n "$not_found_msg"
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then
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printf "%s\n" "$not_found_msg"
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fi
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test -n "$shown_any"
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}
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}
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diff_mode () {
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test "$TOOL_MODE" = diff
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}
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merge_mode () {
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test "$TOOL_MODE" = merge
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}
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get_gui_default () {
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if diff_mode
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then
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GUI_DEFAULT_KEY="difftool.guiDefault"
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else
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GUI_DEFAULT_KEY="mergetool.guiDefault"
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fi
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GUI_DEFAULT_CONFIG_LCASE=$(git config --default false --get "$GUI_DEFAULT_KEY" | tr 'A-Z' 'a-z')
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if test "$GUI_DEFAULT_CONFIG_LCASE" = "auto"
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then
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if test -n "$DISPLAY"
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then
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GUI_DEFAULT=true
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else
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GUI_DEFAULT=false
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fi
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else
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GUI_DEFAULT=$(git config --default false --bool --get "$GUI_DEFAULT_KEY")
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subshell_exit_status=$?
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if test $subshell_exit_status -ne 0
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then
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exit $subshell_exit_status
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fi
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fi
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echo $GUI_DEFAULT
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}
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gui_mode () {
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if test -z "$GIT_MERGETOOL_GUI"
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then
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GIT_MERGETOOL_GUI=$(get_gui_default)
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if test $? -ne 0
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then
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exit 2
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fi
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fi
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test "$GIT_MERGETOOL_GUI" = true
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}
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translate_merge_tool_path () {
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echo "$1"
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}
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check_unchanged () {
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if test "$MERGED" -nt "$BACKUP"
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then
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return 0
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else
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while true
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do
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echo "$MERGED seems unchanged."
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printf "Was the merge successful [y/n]? "
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read answer || return 1
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case "$answer" in
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y*|Y*) return 0 ;;
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n*|N*) return 1 ;;
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esac
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done
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fi
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}
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valid_tool () {
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setup_tool "$1" && return 0
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cmd=$(get_merge_tool_cmd "$1")
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test -n "$cmd"
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}
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setup_user_tool () {
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merge_tool_cmd=$(get_merge_tool_cmd "$tool")
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test -n "$merge_tool_cmd" || return 1
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diff_cmd () {
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( eval $merge_tool_cmd )
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}
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merge_cmd () {
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( eval $merge_tool_cmd )
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}
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list_tool_variants () {
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echo "$tool"
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}
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}
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setup_tool () {
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tool="$1"
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# Fallback definitions, to be overridden by tools.
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can_merge () {
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return 0
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}
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can_diff () {
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return 0
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}
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diff_cmd () {
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return 1
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}
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diff_cmd_help () {
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return 0
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}
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merge_cmd () {
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return 1
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}
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merge_cmd_help () {
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return 0
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}
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hide_resolved_enabled () {
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return 0
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}
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translate_merge_tool_path () {
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echo "$1"
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}
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list_tool_variants () {
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echo "$tool"
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}
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# Most tools' exit codes cannot be trusted, so By default we ignore
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# their exit code and check the merged file's modification time in
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# check_unchanged() to determine whether or not the merge was
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# successful. The return value from run_merge_cmd, by default, is
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# determined by check_unchanged().
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#
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# When a tool's exit code can be trusted then the return value from
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# run_merge_cmd is simply the tool's exit code, and check_unchanged()
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# is not called.
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#
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# The return value of exit_code_trustable() tells us whether or not we
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# can trust the tool's exit code.
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#
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# User-defined and built-in tools default to false.
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# Built-in tools advertise that their exit code is trustable by
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# redefining exit_code_trustable() to true.
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exit_code_trustable () {
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false
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}
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if test -f "$MERGE_TOOLS_DIR/$tool"
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then
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. "$MERGE_TOOLS_DIR/$tool"
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elif test -f "$MERGE_TOOLS_DIR/${tool%[0-9]}"
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then
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. "$MERGE_TOOLS_DIR/${tool%[0-9]}"
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else
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setup_user_tool
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return $?
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fi
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# Now let the user override the default command for the tool. If
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# they have not done so then this will return 1 which we ignore.
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setup_user_tool
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if ! list_tool_variants | grep -q "^$tool$"
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then
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return 1
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fi
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if merge_mode && ! can_merge
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then
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echo "error: '$tool' can not be used to resolve merges" >&2
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return 1
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elif diff_mode && ! can_diff
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then
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echo "error: '$tool' can only be used to resolve merges" >&2
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return 1
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fi
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return 0
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}
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get_merge_tool_cmd () {
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merge_tool="$1"
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if diff_mode
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then
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git config "difftool.$merge_tool.cmd" ||
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git config "mergetool.$merge_tool.cmd"
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else
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git config "mergetool.$merge_tool.cmd"
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fi
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}
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trust_exit_code () {
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if git config --bool "mergetool.$1.trustExitCode"
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then
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:; # OK
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elif exit_code_trustable
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then
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echo true
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else
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echo false
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fi
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}
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initialize_merge_tool () {
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# Bring tool-specific functions into scope
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setup_tool "$1" || return 1
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}
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# Entry point for running tools
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run_merge_tool () {
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# If GIT_PREFIX is empty then we cannot use it in tools
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# that expect to be able to chdir() to its value.
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GIT_PREFIX=${GIT_PREFIX:-.}
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export GIT_PREFIX
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merge_tool_path=$(get_merge_tool_path "$1") || exit
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base_present="$2"
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if merge_mode
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then
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run_merge_cmd "$1"
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else
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run_diff_cmd "$1"
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fi
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}
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# Run a either a configured or built-in diff tool
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run_diff_cmd () {
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diff_cmd "$1"
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}
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# Run a either a configured or built-in merge tool
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run_merge_cmd () {
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mergetool_trust_exit_code=$(trust_exit_code "$1")
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if test "$mergetool_trust_exit_code" = "true"
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then
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merge_cmd "$1"
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else
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touch "$BACKUP"
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merge_cmd "$1"
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check_unchanged
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fi
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}
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list_merge_tool_candidates () {
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if merge_mode
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then
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tools="tortoisemerge"
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else
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tools="kompare"
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fi
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if test -n "$DISPLAY"
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then
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if test -n "$GNOME_DESKTOP_SESSION_ID"
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then
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tools="meld opendiff kdiff3 tkdiff xxdiff $tools"
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else
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tools="opendiff kdiff3 tkdiff xxdiff meld $tools"
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fi
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tools="$tools gvimdiff diffuse diffmerge ecmerge"
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tools="$tools p4merge araxis bc codecompare"
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tools="$tools smerge"
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fi
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case "${VISUAL:-$EDITOR}" in
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*nvim*)
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tools="$tools nvimdiff vimdiff emerge"
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;;
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*vim*)
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tools="$tools vimdiff nvimdiff emerge"
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;;
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*)
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tools="$tools emerge vimdiff nvimdiff"
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;;
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esac
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}
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show_tool_help () {
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tool_opt="'git ${TOOL_MODE}tool --tool=<tool>'"
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tab=' '
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LF='
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'
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any_shown=no
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cmd_name=${TOOL_MODE}tool
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config_tools=$({
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diff_mode && list_config_tools difftool "$tab$tab"
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list_config_tools mergetool "$tab$tab"
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} | sort)
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extra_content=
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if test -n "$config_tools"
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then
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extra_content="${tab}user-defined:${LF}$config_tools"
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fi
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show_tool_names 'mode_ok && is_available' "$tab$tab" \
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"$tool_opt may be set to one of the following:" \
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"No suitable tool for 'git $cmd_name --tool=<tool>' found." \
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"$extra_content" &&
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any_shown=yes
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show_tool_names 'mode_ok && ! is_available' "$tab$tab" \
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"${LF}The following tools are valid, but not currently available:" &&
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any_shown=yes
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if test "$any_shown" = yes
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then
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echo
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echo "Some of the tools listed above only work in a windowed"
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echo "environment. If run in a terminal-only session, they will fail."
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fi
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exit 0
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}
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guess_merge_tool () {
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list_merge_tool_candidates
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cat >&2 <<-EOF
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This message is displayed because '$TOOL_MODE.tool' is not configured.
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See 'git ${TOOL_MODE}tool --tool-help' or 'git help config' for more details.
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'git ${TOOL_MODE}tool' will now attempt to use one of the following tools:
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$tools
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EOF
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# Loop over each candidate and stop when a valid merge tool is found.
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IFS=' '
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for tool in $tools
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do
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is_available "$tool" && echo "$tool" && return 0
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done
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echo >&2 "No known ${TOOL_MODE} tool is available."
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return 1
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}
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get_configured_merge_tool () {
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keys=
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if diff_mode
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then
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if gui_mode
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then
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keys="diff.guitool merge.guitool diff.tool merge.tool"
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else
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keys="diff.tool merge.tool"
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fi
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else
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if gui_mode
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then
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keys="merge.guitool merge.tool"
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else
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keys="merge.tool"
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fi
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fi
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merge_tool=$(
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IFS=' '
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for key in $keys
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do
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selected=$(git config $key)
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if test -n "$selected"
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then
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echo "$selected"
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return
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fi
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done)
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if test -n "$merge_tool" && ! valid_tool "$merge_tool"
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then
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echo >&2 "git config option $TOOL_MODE.${gui_prefix}tool set to unknown tool: $merge_tool"
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echo >&2 "Resetting to default..."
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return 1
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fi
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echo "$merge_tool"
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}
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get_merge_tool_path () {
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# A merge tool has been set, so verify that it's valid.
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merge_tool="$1"
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if ! valid_tool "$merge_tool"
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then
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echo >&2 "Unknown merge tool $merge_tool"
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exit 1
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fi
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if diff_mode
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then
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merge_tool_path=$(git config difftool."$merge_tool".path ||
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git config mergetool."$merge_tool".path)
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else
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merge_tool_path=$(git config mergetool."$merge_tool".path)
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fi
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if test -z "$merge_tool_path"
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then
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merge_tool_path=$(translate_merge_tool_path "$merge_tool")
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fi
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if test -z "$(get_merge_tool_cmd "$merge_tool")" &&
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! type "$merge_tool_path" >/dev/null 2>&1
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then
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echo >&2 "The $TOOL_MODE tool $merge_tool is not available as"\
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"'$merge_tool_path'"
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exit 1
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fi
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echo "$merge_tool_path"
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}
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get_merge_tool () {
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is_guessed=false
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# Check if a merge tool has been configured
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merge_tool=$(get_configured_merge_tool)
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subshell_exit_status=$?
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if test $subshell_exit_status -gt "1"
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then
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exit $subshell_exit_status
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fi
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# Try to guess an appropriate merge tool if no tool has been set.
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if test -z "$merge_tool"
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then
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merge_tool=$(guess_merge_tool) || exit
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is_guessed=true
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fi
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echo "$merge_tool"
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test "$is_guessed" = false
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}
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mergetool_find_win32_cmd () {
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executable=$1
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sub_directory=$2
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# Use $executable if it exists in $PATH
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if type -p "$executable" >/dev/null 2>&1
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then
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printf '%s' "$executable"
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return
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fi
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# Look for executable in the typical locations
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for directory in $(env | grep -Ei '^PROGRAM(FILES(\(X86\))?|W6432)=' |
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cut -d '=' -f 2- | sort -u)
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do
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if test -n "$directory" && test -x "$directory/$sub_directory/$executable"
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then
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printf '%s' "$directory/$sub_directory/$executable"
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return
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fi
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done
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printf '%s' "$executable"
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}
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