git/git-mergetool--lib.sh
Fernando Ramos 7b5cf8be18 vimdiff: add tool documentation
Running 'git {merge,diff}tool --tool-help' now also prints usage
information about the vimdiff tool (and its variants) instead of just
its name.

Two new functions ('diff_cmd_help()' and 'merge_cmd_help()') have been
added to the set of functions that each merge tool (ie. scripts found
inside "mergetools/") can overwrite to provided tool specific
information.

Right now, only 'mergetools/vimdiff' implements these functions, but
other tools are encouraged to do so in the future, specially if they
take configuration options not explained anywhere else (as it is the
case with the 'vimdiff' tool and the new 'layout' option)

Note that the function 'show_tool_names', used in the implementation of
'git mergetool --tool-help', is also used in Documentation/Makefile to
generate the list of allowed values for the configuration variables
'{diff,merge}.{gui,}tool'. Adjust the rule so its output is an Asciidoc
"description list" instead of a plain list, with the tool name as the
item and the newly added tool description as the description.

In addition, a section has been added to
"Documentation/git-mergetool.txt" to explain the new "layout"
configuration option with examples.

Helped-by: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Fernando Ramos <greenfoo@u92.eu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-04-03 15:09:52 -07:00

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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 "$TOOL_MODE" = merge
}
gui_mode () {
test "$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 $merge_tool_cmd )
}
list_tool_variants () {
echo "$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)
# 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"
}