[PATCH v3 6/6] line-range-highlight: copy URL to clipboard on click

[john at keeping.me.uk (John Keeping)]

On Sun, Jun 24, 2018 at 10:44:54AM +0800, Andy Green wrote:
> Since the only reason to click on the line number links
> is to get the corresponding #URL to share, this patch
> makes that process more convenient by copying the
> highlit area, be it a single line or a range, to the
> clipboard on each click of the line number links.

As a user, I'd find this surprising and probably quite annoying.

I strongly prefer that software not overwrite the clipboard contents
without an explicit request to do so.  A quick survey suggests none of
GitHub, Gitlab or repo.or.cz (GitWeb) behave in this way.

> Signed-off-by: Andy Green <andy at warmcat.com>
> ---
>  cgit.js |   36 ++++++++++++++++++++++++++++++++----
>  1 file changed, 32 insertions(+), 4 deletions(-)
> 
> diff --git a/cgit.js b/cgit.js
> index 2cfad29..e2c3799 100644
> --- a/cgit.js
> +++ b/cgit.js
> @@ -89,8 +89,29 @@ function cgit_line_range_highlight()
>  		e.scrollIntoView(true);
>  }
>  
> +function cgit_copy_clipboard(value)
> +{
> +	var inp = document.createElement("textarea");
> +	var e = document.getElementById("linenumber_td");
> +
> +	inp.type = "text";
> +	inp.value = value;
> +	/* hidden style stops it working for clipboard */
> +	inp.setAttribute('readonly', '');
> +	inp.style.position = "absolute";
> +	inp.style.left = "-1000px";
> +
> +	e.appendChild(inp);
> +
> +	inp.select();
> +
> +	document.execCommand("copy");
> +
> +	inp.remove();
> +}
> +
>  function cgit_line_range_click(e) {
> -	var t = e.target.id;
> +	var t = e.target.id, cp;
>  
>  	cgit_line_range_override = null;
>  
> @@ -101,13 +122,13 @@ function cgit_line_range_click(e) {
>  	 * is called, and override it there.
>  	 */
>  
> -	if (window.location.hash && window.location.hash.indexOf("-") < 0)
> +	if (window.location.hash && window.location.hash.indexOf("-") < 0) {
>  		if (parseInt(window.location.hash.substring(2)) <
>  		    parseInt(t.substring(1))) /* forwards */
> -			cgit_line_range_override =
> +			cp = cgit_line_range_override =
>  				window.location + '-' + t.substring(1);
>  		else /* backwards */
> -			cgit_line_range_override =
> +			cp = cgit_line_range_override =
>  				window.location.href.substring(0,
>  					window.location.href.length -
>  					window.location.hash.length) +
> @@ -115,6 +136,13 @@ function cgit_line_range_click(e) {
>  					window.location.href.substring(
>  						window.location.href.length -
>  						window.location.hash.length + 2);
> +	} else
> +		cp = window.location.href.substring(0,
> +                                        window.location.href.length -
> +                                        window.location.hash.length) +
> +			'#n' + t.substring(1);
> +
> +	cgit_copy_clipboard(cp);
>  }
>  
>  /* line range highlight */
> 
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