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![Jonathan Nieder](/assets/img/avatar_default.png)
In a shell snippet meant to be sourced by other shell scripts, an opening #! line does more harm than good. The harm: - When the shell library is sourced, the interpreter and options from the #! line are not used. Specifying a particular shell can confuse the reader into thinking it is safe for the shell library to rely on idiosyncrasies of that shell. - Using #! instead of a plain comment drops a helpful visual clue that this is a shell library and not a self-contained script. - Tools such as lintian can use a #! line to tell when an installation script has failed by forgetting to set a script executable. This check does not work if shell libraries also start with a #! line. The good: - Text editors notice the #! line and use it for syntax highlighting if you try to edit the installed scripts (without ".sh" suffix) in place. The use of the #! for file type detection is not needed because Git's shell libraries are meant to be edited in source form (with ".sh" suffix). Replace the opening #! lines with comments. This involves tweaking the test harness's valgrind support to find shell libraries by looking for "# " in the first line instead of "#!" (see v1.7.6-rc3~7, 2011-06-17). Suggested by Russ Allbery through lintian. Thanks to Jeff King and Clemens Buchacher for further analysis. Tested by searching for non-executable scripts with #! line: find . -name .git -prune -o -type f -not -executable | while read file do read line <"$file" case $line in '#!'*) echo "$file" ;; esac done The only remaining scripts found are templates for shell scripts (unimplemented.sh, wrap-for-bin.sh) and sample input used in tests (t/t4034/perl/{pre,post}). Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
380 lines
7.4 KiB
Bash
380 lines
7.4 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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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 toolname
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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" "$preamble"
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preamble=
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fi
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shown_any=yes
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printf "%s%s\n" "$per_line_prefix" "$toolname"
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fi
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done
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if test -n "$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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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 "$BACKUP"
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then
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status=0
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else
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while true
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do
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echo "$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*) status=0; break ;;
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n*|N*) status=1; break ;;
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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 $merge_tool_cmd )
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status=$?
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return $status
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}
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merge_cmd () {
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trust_exit_code=$(git config --bool \
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"mergetool.$1.trustExitCode" || echo false)
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if test "$trust_exit_code" = "false"
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then
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touch "$BACKUP"
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( eval $merge_tool_cmd )
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status=$?
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check_unchanged
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else
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( eval $merge_tool_cmd )
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status=$?
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fi
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return $status
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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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status=1
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return $status
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}
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merge_cmd () {
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status=1
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return $status
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}
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translate_merge_tool_path () {
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echo "$1"
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}
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if ! test -f "$MERGE_TOOLS_DIR/$tool"
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then
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setup_user_tool
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return $?
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fi
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# Load the redefined functions
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. "$MERGE_TOOLS_DIR/$tool"
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# Now let the user override the default command for the tool. If
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# they have not done so then this will return 1 which we ignore.
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setup_user_tool
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if merge_mode && ! can_merge
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then
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echo "error: '$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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# 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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status=0
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# Bring tool-specific functions into scope
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setup_tool "$1" || return 1
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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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return $status
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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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merge_cmd "$1"
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}
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list_merge_tool_candidates () {
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if merge_mode
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then
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tools="tortoisemerge"
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else
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tools="kompare"
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fi
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if test -n "$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="$tools p4merge araxis bc3 codecompare"
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fi
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case "${VISUAL:-$EDITOR}" in
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*vim*)
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tools="$tools vimdiff emerge"
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;;
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*)
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tools="$tools emerge vimdiff"
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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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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 ${TOOL_MODE} tool is available."
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return 1
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}
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get_configured_merge_tool () {
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# Diff mode first tries diff.tool and falls back to merge.tool.
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# Merge mode only checks merge.tool
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if diff_mode
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then
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merge_tool=$(git config diff.tool || git config merge.tool)
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else
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merge_tool=$(git config merge.tool)
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fi
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if test -n "$merge_tool" && ! valid_tool "$merge_tool"
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then
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echo >&2 "git config option $TOOL_MODE.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 "$merge_tool_path"
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}
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get_merge_tool () {
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# Check if a merge tool has been configured
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merge_tool=$(get_configured_merge_tool)
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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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fi
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echo "$merge_tool"
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}
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