git-wrapper: optionally skip cd $HOME when configured via resources

We recently added the ability to configure copies of the Git wrapper to
launch custom command-lines, configured via plain old Windows resources.
The main user is Git for Windows' `git-bash.exe`, of course. When the
user double-clicks the `git bash` icon, it makes sense to start the Bash
in the user's home directory.

Third-party software, such as TortoiseGit or GitHub for Windows, may
want to start the Git Bash in another directory, though.

Now, when third-party software wants to call Git, they already have to
construct a command-line, and can easily pass a command-line option
`--no-cd` (which this commit introduces), and since that option is not
available when the user double-clicks an icon on the Desktop or in the
Explorer, let's keep the default to switch to the home directory if the
`--no-cd` flag was not passed along.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

compat/win32/git-wrapper.c

@@ -163,7 +163,7 @@ static LPWSTR fixup_commandline(LPWSTR exepath, LPWSTR *exep, int *wait,
 
 static int configure_via_resource(LPWSTR basename, LPWSTR exepath, LPWSTR exep,
 	LPWSTR *prefix_args, int *prefix_args_len,
-	int *is_git_command, int *start_in_home)
+	int *is_git_command, int *start_in_home, int *skip_arguments)
 {
 	int id = 0, wargc;
 	LPWSTR *wargv;
@@ -255,7 +255,14 @@ static int configure_via_resource(LPWSTR basename, LPWSTR exepath, LPWSTR exep,
 	*prefix_args_len = wcslen(buf);
 
 	*is_git_command = 0;
-	*start_in_home = 1;
+	wargv = CommandLineToArgvW(GetCommandLine(), &wargc);
+	if (wargc < 2 || wcscmp(L"--no-cd", wargv[1]))
+		*start_in_home = 1;
+	else {
+		*start_in_home = 0;
+		*skip_arguments = 1;
+	}
+	LocalFree(wargv);
 
 	return 1;
 }
@@ -281,7 +288,7 @@ int main(void)
 	basename = exepath + wcslen(exepath) + 1;
 	if (configure_via_resource(basename, exepath, exep,
 			&prefix_args, &prefix_args_len,
-			&is_git_command, &start_in_home)) {
+			&is_git_command, &start_in_home, &skip_arguments)) {
 		/* do nothing */
 	}
 	else if (!wcsncmp(basename, L"git-", 4)) {