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mergetool: new config guiDefault supports auto-toggling gui by DISPLAY

When no merge.tool or diff.tool is configured or manually selected, the
selection of a default tool is sensitive to the DISPLAY variable; in a
GUI session a gui-specific tool will be proposed if found, and
otherwise a terminal-based one. This "GUI-optimizing" behavior is
important because a GUI can make a huge difference to a user's ability
to understand and correctly complete a non-trivial conflicting merge.

Some time ago the merge.guitool and diff.guitool config options were
introduced to enable users to configure both a GUI tool, and a non-GUI
tool (with fallback if no GUI tool configured), in the same environment.

Unfortunately, the --gui argument introduced to support the selection of
the guitool is still explicit. When using configured tools, there is no
equivalent of the no-tool-configured "propose a GUI tool if we are in a GUI
environment" behavior.

As proposed in <xmqqmtb8jsej.fsf@gitster.g>, introduce new configuration
options, difftool.guiDefault and mergetool.guiDefault, supporting a special
value "auto" which causes the corresponding tool or guitool to be selected
depending on the presence of a non-empty DISPLAY value. Also support "true"
to say "default to the guitool (unless --no-gui is passed on the
commandline)", and "false" as the previous default behavior when these new
configuration options are not specified.

Signed-off-by: Tao Klerks <tao@klerks.biz>
Acked-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Tao Klerks 2023-03-18 15:27:43 +00:00 committed by Junio C Hamano
parent ae73b2c8f1
commit 42943b950e
10 changed files with 179 additions and 14 deletions

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@ -34,3 +34,10 @@ See the `--trust-exit-code` option in linkgit:git-difftool[1] for more details.
difftool.prompt::
Prompt before each invocation of the diff tool.
difftool.guiDefault::
Set `true` to use the `diff.guitool` by default (equivalent to specifying
the `--gui` argument), or `auto` to select `diff.guitool` or `diff.tool`
depending on the presence of a `DISPLAY` environment variable value. The
default is `false`, where the `--gui` argument must be provided
explicitly for the `diff.guitool` to be used.

View File

@ -85,3 +85,10 @@ mergetool.writeToTemp::
mergetool.prompt::
Prompt before each invocation of the merge resolution program.
mergetool.guiDefault::
Set `true` to use the `merge.guitool` by default (equivalent to
specifying the `--gui` argument), or `auto` to select `merge.guitool`
or `merge.tool` depending on the presence of a `DISPLAY` environment
variable value. The default is `false`, where the `--gui` argument
must be provided explicitly for the `merge.guitool` to be used.

View File

@ -97,10 +97,12 @@ instead. `--no-symlinks` is the default on Windows.
--[no-]gui::
When 'git-difftool' is invoked with the `-g` or `--gui` option
the default diff tool will be read from the configured
`diff.guitool` variable instead of `diff.tool`. The `--no-gui`
option can be used to override this setting. If `diff.guitool`
is not set, we will fallback in the order of `merge.guitool`,
`diff.tool`, `merge.tool` until a tool is found.
`diff.guitool` variable instead of `diff.tool`. This may be
selected automatically using the configuration variable
`difftool.guiDefault`. The `--no-gui` option can be used to
override these settings. If `diff.guitool` is not set, we will
fallback in the order of `merge.guitool`, `diff.tool`,
`merge.tool` until a tool is found.
--[no-]trust-exit-code::
'git-difftool' invokes a diff tool individually on each file.

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@ -85,12 +85,13 @@ success of the resolution after the custom tool has exited.
the default merge tool will be read from the configured
`merge.guitool` variable instead of `merge.tool`. If
`merge.guitool` is not set, we will fallback to the tool
configured under `merge.tool`.
configured under `merge.tool`. This may be autoselected using
the configuration variable `mergetool.guiDefault`.
--no-gui::
This overrides a previous `-g` or `--gui` setting and reads the
default merge tool will be read from the configured `merge.tool`
variable.
This overrides a previous `-g` or `--gui` setting or
`mergetool.guiDefault` configuration and reads the default merge
tool from the configured `merge.tool` variable.
-O<orderfile>::
Process files in the order specified in the

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@ -685,7 +685,7 @@ static int run_file_diff(int prompt, const char *prefix,
int cmd_difftool(int argc, const char **argv, const char *prefix)
{
int use_gui_tool = 0, dir_diff = 0, prompt = -1, symlinks = 0,
int use_gui_tool = -1, dir_diff = 0, prompt = -1, symlinks = 0,
tool_help = 0, no_index = 0;
static char *difftool_cmd = NULL, *extcmd = NULL;
struct option builtin_difftool_options[] = {
@ -735,13 +735,21 @@ int cmd_difftool(int argc, const char **argv, const char *prefix)
} else if (dir_diff)
die(_("options '%s' and '%s' cannot be used together"), "--dir-diff", "--no-index");
die_for_incompatible_opt3(use_gui_tool, "--gui",
die_for_incompatible_opt3(use_gui_tool == 1, "--gui",
!!difftool_cmd, "--tool",
!!extcmd, "--extcmd");
if (use_gui_tool)
/*
* Explicitly specified GUI option is forwarded to git-mergetool--lib.sh;
* empty or unset means "use the difftool.guiDefault config or default to
* false".
*/
if (use_gui_tool == 1)
setenv("GIT_MERGETOOL_GUI", "true", 1);
else if (difftool_cmd) {
else if (use_gui_tool == 0)
setenv("GIT_MERGETOOL_GUI", "false", 1);
if (difftool_cmd) {
if (*difftool_cmd)
setenv("GIT_DIFF_TOOL", difftool_cmd, 1);
else

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@ -75,6 +75,11 @@ then
merge_tool="$GIT_DIFF_TOOL"
else
merge_tool="$(get_merge_tool)"
subshell_exit_status=$?
if test $subshell_exit_status -gt 1
then
exit $subshell_exit_status
fi
fi
fi

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@ -97,7 +97,42 @@ 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
}
@ -467,6 +502,11 @@ 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

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@ -451,7 +451,7 @@ print_noop_and_exit () {
main () {
prompt=$(git config --bool mergetool.prompt)
GIT_MERGETOOL_GUI=false
GIT_MERGETOOL_GUI=
guessed_merge_tool=false
orderfile=
@ -511,9 +511,14 @@ main () {
if test -z "$merge_tool"
then
if ! merge_tool=$(get_merge_tool)
merge_tool=$(get_merge_tool)
subshell_exit_status=$?
if test $subshell_exit_status = 1
then
guessed_merge_tool=true
elif test $subshell_exit_status -gt 1
then
exit $subshell_exit_status
fi
fi
merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"

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@ -860,4 +860,42 @@ test_expect_success 'mergetool hideResolved' '
git commit -m "test resolved with mergetool"
'
test_expect_success 'mergetool with guiDefault' '
test_config merge.guitool myguitool &&
test_config mergetool.myguitool.cmd "(printf \"gui \" && cat \"\$REMOTE\") >\"\$MERGED\"" &&
test_config mergetool.myguitool.trustExitCode true &&
test_when_finished "git reset --hard" &&
git checkout -b test$test_count branch1 &&
git submodule update -N &&
test_must_fail git merge main &&
test_config mergetool.guiDefault auto &&
DISPLAY=SOMETHING && export DISPLAY &&
yes "" | git mergetool both &&
yes "" | git mergetool file1 file1 &&
DISPLAY= && export DISPLAY &&
yes "" | git mergetool file2 "spaced name" &&
test_config mergetool.guiDefault true &&
yes "" | git mergetool subdir/file3 &&
yes "d" | git mergetool file11 &&
yes "d" | git mergetool file12 &&
yes "l" | git mergetool submod &&
echo "gui main updated" >expect &&
test_cmp expect file1 &&
echo "main new" >expect &&
test_cmp expect file2 &&
echo "gui main new sub" >expect &&
test_cmp expect subdir/file3 &&
echo "branch1 submodule" >expect &&
test_cmp expect submod/bar &&
git commit -m "branch1 resolved with mergetool"
'
test_done

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@ -155,6 +155,58 @@ test_expect_success 'difftool honors --gui' '
test_cmp expect actual
'
test_expect_success 'difftool with guiDefault auto selects gui tool when there is DISPLAY' '
difftool_test_setup &&
test_config merge.tool bogus-tool &&
test_config diff.tool bogus-tool &&
test_config diff.guitool test-tool &&
test_config difftool.guiDefault auto &&
DISPLAY=SOMETHING && export DISPLAY &&
echo branch >expect &&
git difftool --no-prompt branch >actual &&
test_cmp expect actual
'
test_expect_success 'difftool with guiDefault auto selects regular tool when no DISPLAY' '
difftool_test_setup &&
test_config diff.guitool bogus-tool &&
test_config diff.tool test-tool &&
test_config difftool.guiDefault Auto &&
DISPLAY= && export DISPLAY &&
echo branch >expect &&
git difftool --no-prompt branch >actual &&
test_cmp expect actual
'
test_expect_success 'difftool with guiDefault true selects gui tool' '
difftool_test_setup &&
test_config diff.tool bogus-tool &&
test_config diff.guitool test-tool &&
test_config difftool.guiDefault true &&
DISPLAY= && export DISPLAY &&
echo branch >expect &&
git difftool --no-prompt branch >actual &&
test_cmp expect actual &&
DISPLAY=Something && export DISPLAY &&
echo branch >expect &&
git difftool --no-prompt branch >actual &&
test_cmp expect actual
'
test_expect_success 'difftool --no-gui trumps config guiDefault' '
difftool_test_setup &&
test_config diff.guitool bogus-tool &&
test_config diff.tool test-tool &&
test_config difftool.guiDefault true &&
echo branch >expect &&
git difftool --no-prompt --no-gui branch >actual &&
test_cmp expect actual
'
test_expect_success 'difftool --gui last setting wins' '
difftool_test_setup &&
: >expect &&