git gui: add directly calling merge tool from gitconfig

git gui can open a merge tool when conflicts are detected (Right click
in the diff of the file with conflicts).
The merge tools that are allowed to use are hard coded into git gui.

If one wants to add a new merge tool it has to be added to git gui
through a source code change.
This is not convenient in comparison to how it works in git (without gui).

git itself has configuration options for a merge tools path and command
in the git config.
New merge tools can be set up there without a source code change.

Those options are used only by pure git in contrast to git gui. git calls
the configured merge tools directly from the config while git Gui doesn't.

With this change git gui can call merge tools configured in the gitconfig
directly without a change in git gui source code.
It needs a configured merge.tool and a configured mergetool.cmd config
entry.

gitconfig example:
[merge]
	tool = vscode
[mergetool "vscode"]
	path = the/path/to/Code.exe
	cmd = \"Code.exe\" --wait --merge \"$LOCAL\" \"$REMOTE\" \"$BASE\" \"$MERGED\"

Without the mergetool.cmd configuration and an unsupported merge.tool
entry, git gui behaves mainly as before this change and informs the user
about an unsupported merge tool. In addtition it also shows a hint to add
a config entry to use the tool as an unsupported tool with degraded
support.

If a wrong mergetool.cmd is configured by accident, it gets handled
by git gui already. In this case git gui informs the user that the merge
tool couldn't be opened. This behavior is preserved by this change and
should not change.

"Beyond Compare 3" and "Visual Studio Code" were tested as manually
configured merge tools.

Signed-off-by: Tobias Boesch <[email protected]>

git-gui/lib/mergetool.tcl

@@ -272,8 +272,24 @@ proc merge_resolve_tool2 {} {
 		}
 	}
 	default {
-		error_popup [mc "Unsupported merge tool '%s'" $tool]
-		return
+		set tool_cmd [get_config mergetool.$tool.cmd]
+		if {$tool_cmd ne {}} {
+			foreach command_part $tool_cmd {
+				if {([string first {[} $tool_cmd] != -1) || ([string first {]} $tool_cmd] != -1)} {
+					error_popup [mc "Unable to process square brackets in mergetool.cmd configuration option.\
+									 Please remove the square brackets."]
+					return
+				} else {
+					lappend cmdline [subst -nobackslashes -nocommands $command_part]
+				}
+			}
+		} else {
+			error_popup [mc "Unsupported merge tool '%s'.\n
+							Currently unsupported tools can be added and used as unsupported tools with degraded support\
+							by adding the command of the tool to the \"mergetool.cmd\" option in the config.
+							See the configuration documentation for more details." $tool]
+			return
+		}
 	}
 	}