Re: [PATCH v3] launch_editor(): indicate that Git waits for user input

[Kaartic Sivaraam <kaartic.sivaraam@gmail.com>]

On Monday 27 November 2017 07:17 PM, lars.schneider@autodesk.com wrote:

> Show a message in the original terminal and get rid of it when the
> editor returns.
> 

"... except in the case when an error occurs." could  be included if needed.
> +		static const char *close_notice = NULL;
> +

IIRC, this variable is bound to be `static` for sake of future proofing. 
So, I guess you could use the following suggestion of Eric Sunshine in 
the below conditional.

     If you reverse this condition to say (!close_notice && isatty(2)),
     then you save an isatty() invocation each time if close_notice is
     already assigned.

> +		if (isatty(2) && !close_notice) {
> +			char *term = getenv("TERM");
> +
> +			if (term && strcmp(term, "dumb"))
> +				/*
> +				 * go back to the beginning and erase the
> +				 * entire line if the terminal is capable
> +				 * to do so, to avoid wasting the vertical
> +				 * space.
> +				 */
> +				close_notice = "\r\033[K";
> +			else if (term && strstr(term, "emacsclient"))
> +				/*
> +				 * `emacsclient` (or `emacsclientw` on Windows) already prints
> +				 * ("Waiting for Emacs...") if a file is opened for editing.
> +				 * Therefore, we don't need to print the editor launch info.
> +				 */
> +				;
> +			else
> +				/* otherwise, complete and waste the line */
> +				close_notice = _("done.\n");
> +		}
> +
> +		if (close_notice) {
> +			fprintf(stderr, _("Launched editor. Waiting for your input... "));
> +			fflush(stderr);
> +		}
> 
>   		p.argv = args;
>   		p.env = env;
> @@ -53,11 +82,14 @@ int launch_editor(const char *path, struct strbuf *buffer, const char *const *en
>   		sig = ret - 128;
>   		sigchain_pop(SIGINT);
>   		sigchain_pop(SIGQUIT);
> +
>   		if (sig == SIGINT || sig == SIGQUIT)
>   			raise(sig);
>   		if (ret)
>   			return error("There was a problem with the editor '%s'.",
>   					editor);
> +		if (close_notice)
> +			fputs(close_notice, stderr);
>   	}
> 
>   	if (!buffer)
> --
> 2.15.0
>