Re: [PATCH] gitk: add diff lines background colors

> Not using colored background for added and removed lines is a missed
> opportunity to make diff lines easier to grasp visually.
> 
> Use a subtle red/green background by default. Make the font slightly darker
> to improve contrast.

> 
> Signed-off-by: Stefan Dotterweich <stefandotterweich@gmx.de>
> ---
> The variable diffcolors seems like a fitting place for the two new colors.
> However, adding them to that list causes problems if diffcolors saved in
> .gitk then contains three instead of five colors. This could be solved by
> modifying the variable after loading .gitk. I'm not sure if that would be
> the preferred approach or where to implement a special case like that. To
> avoid the problem, I introduced a new variable diffbgcolors.
> 
>  gitk | 22 +++++++++++++++++++---
>  1 file changed, 19 insertions(+), 3 deletions(-)
> 
> diff --git a/gitk b/gitk
> index da84e22..66c237a 100755
> --- a/gitk
> +++ b/gitk
> @@ -2073,7 +2073,7 @@ proc makewindow {} {
>      global rowctxmenu fakerowmenu mergemax wrapcomment
>      global highlight_files gdttype
>      global searchstring sstring
> -    global bgcolor fgcolor bglist fglist diffcolors selectbgcolor
> +    global bgcolor fgcolor bglist fglist diffcolors diffbgcolors selectbgcolor
>      global uifgcolor uifgdisabledcolor
>      global filesepbgcolor filesepfgcolor
>      global mergecolors foundbgcolor currentsearchhitbgcolor
> @@ -2434,7 +2434,9 @@ proc makewindow {} {
>      $ctext tag conf filesep -font textfontbold -fore $filesepfgcolor -back $filesepbgcolor
>      $ctext tag conf hunksep -fore [lindex $diffcolors 2]
>      $ctext tag conf d0 -fore [lindex $diffcolors 0]
> +    $ctext tag conf d0 -back [lindex $diffbgcolors 0]
>      $ctext tag conf dresult -fore [lindex $diffcolors 1]
> +    $ctext tag conf dresult -back [lindex $diffbgcolors 1]
>      $ctext tag conf m0 -fore [lindex $mergecolors 0]
>      $ctext tag conf m1 -fore [lindex $mergecolors 1]
>      $ctext tag conf m2 -fore [lindex $mergecolors 2]
> @@ -11607,6 +11609,7 @@ proc prefspage_general {notebook} {
> 
>  proc prefspage_colors {notebook} {
>      global NS uicolor bgcolor fgcolor ctext diffcolors selectbgcolor markbgcolor
> +    global diffbgcolors
> 
>      set page [create_prefs_page $notebook.colors]
> 
> @@ -11629,11 +11632,23 @@ proc prefspage_colors {notebook} {
>  	-command [list choosecolor diffcolors 0 $page.diffold [mc "diff old lines"] \
>  		      [list $ctext tag conf d0 -foreground]]
>      grid x $page.diffoldbut $page.diffold -sticky w
> +    label $page.diffoldbg -padx 40 -relief sunk -background [lindex $diffbgcolors 0]
> +    ${NS}::button $page.diffoldbgbut -text [mc "Diff: old lines bg"] \
> +	-command [list choosecolor diffbgcolors 0 $page.diffoldbg \
> +		      [mc "diff old lines bg"] \
> +		      [list $ctext tag conf d0 -background]]
> +    grid x $page.diffoldbgbut $page.diffoldbg -sticky w
>      label $page.diffnew -padx 40 -relief sunk -background [lindex $diffcolors 1]
>      ${NS}::button $page.diffnewbut -text [mc "Diff: new lines"] \
>  	-command [list choosecolor diffcolors 1 $page.diffnew [mc "diff new lines"] \
>  		      [list $ctext tag conf dresult -foreground]]
>      grid x $page.diffnewbut $page.diffnew -sticky w
> +    label $page.diffnewbg -padx 40 -relief sunk -background [lindex $diffbgcolors 1]
> +    ${NS}::button $page.diffnewbgbut -text [mc "Diff: new lines bg"] \
> +	-command [list choosecolor diffbgcolors 1 $page.diffnewbg \
> +		      [mc "diff new lines bg"] \
> +		      [list $ctext tag conf dresult -background]]
> +    grid x $page.diffnewbgbut $page.diffnewbg -sticky w
>      label $page.hunksep -padx 40 -relief sunk -background [lindex $diffcolors 2]
>      ${NS}::button $page.hunksepbut -text [mc "Diff: hunk header"] \
>  	-command [list choosecolor diffcolors 2 $page.hunksep \
> @@ -12377,7 +12392,8 @@ if {[tk windowingsystem] eq "win32"} {
>  	set web_browser "xdg-open"
>      }
>  }
> -set diffcolors {red "#00a000" blue}
> +set diffcolors {"#c30000" "#009800" blue}
> +set diffbgcolors {"#fff3f3" "#f0fff0"}
>  set diffcontext 3
>  set mergecolors {red blue "#00ff00" purple brown "#009090" magenta "#808000" "#009000" "#ff0080" cyan "#b07070" "#70b0f0" "#70f0b0" "#f0b070" "#ff70b0"}
>  set ignorespace 0
> @@ -12448,7 +12464,7 @@ set config_variables {
>      remotebgcolor tagbgcolor tagfgcolor tagoutlinecolor reflinecolor
>      filesepbgcolor filesepfgcolor linehoverbgcolor linehoverfgcolor
>      linehoveroutlinecolor mainheadcirclecolor workingfilescirclecolor
> -    indexcirclecolor circlecolors linkfgcolor circleoutlinecolor
> +    indexcirclecolor circlecolors linkfgcolor circleoutlinecolor diffbgcolors
>      web_browser
>  }
>  foreach var $config_variables {
> --
> 2.24.1
> 
>