Re: [PATCH v2 3/4] git-gui: Add the ability to revert selected lines

[Bert Wesarg <bert.wesarg@googlemail.com>]

On Fri, Aug 23, 2019 at 12:01 AM Pratyush Yadav <me@yadavpratyush.com> wrote:
>
> Just like the user can select lines to stage or unstage, add the
> ability to revert selected lines.
>
> Signed-off-by: Pratyush Yadav <me@yadavpratyush.com>
> ---
>  git-gui.sh   | 25 ++++++++++++++++++++++++-
>  lib/diff.tcl | 31 ++++++++++++++++++++++++++-----
>  2 files changed, 50 insertions(+), 6 deletions(-)
>
> diff --git a/git-gui.sh b/git-gui.sh
> index b7811d8..9d84ba9 100755
> --- a/git-gui.sh
> +++ b/git-gui.sh
> @@ -3588,9 +3588,15 @@ set ui_diff_applyhunk [$ctxm index last]
>  lappend diff_actions [list $ctxm entryconf $ui_diff_applyhunk -state]
>  $ctxm add command \
>         -label [mc "Apply/Reverse Line"] \
> -       -command {apply_range_or_line $cursorX $cursorY; do_rescan}
> +       -command {apply_or_revert_range_or_line $cursorX $cursorY 0; do_rescan}
>  set ui_diff_applyline [$ctxm index last]
>  lappend diff_actions [list $ctxm entryconf $ui_diff_applyline -state]
> +$ctxm add command \
> +       -label [mc "Revert Line"] \
> +       -command {apply_or_revert_range_or_line $cursorX $cursorY 1; do_rescan}
> +set ui_diff_revertline [$ctxm index last]
> +lappend diff_actions [list $ctxm entryconf $ui_diff_revertline -state]
> +set ui_diff_revertline [$ctxm index last]
>  $ctxm add separator
>  $ctxm add command \
>         -label [mc "Show Less Context"] \
> @@ -3688,15 +3694,19 @@ proc popup_diff_menu {ctxm ctxmmg ctxmsm x y X Y} {
>                         set l [mc "Unstage Hunk From Commit"]
>                         if {$has_range} {
>                                 set t [mc "Unstage Lines From Commit"]
> +                               set r [mc "Revert Lines"]
>                         } else {
>                                 set t [mc "Unstage Line From Commit"]
> +                               set r [mc "Revert Line"]
>                         }
>                 } else {
>                         set l [mc "Stage Hunk For Commit"]
>                         if {$has_range} {
>                                 set t [mc "Stage Lines For Commit"]
> +                               set r [mc "Revert Lines"]
>                         } else {
>                                 set t [mc "Stage Line For Commit"]
> +                               set r [mc "Revert Line"]
>                         }
>                 }
>                 if {$::is_3way_diff
> @@ -3707,11 +3717,24 @@ proc popup_diff_menu {ctxm ctxmmg ctxmsm x y X Y} {
>                         || [string match {T?} $state]
>                         || [has_textconv $current_diff_path]} {
>                         set s disabled
> +                       set revert_state disabled
>                 } else {
>                         set s normal
> +
> +                       # Only allow reverting changes in the working tree. If
> +                       # the user wants to revert changes in the index, they
> +                       # need to unstage those first.
> +                       if {$::ui_workdir eq $::current_diff_side} {
> +                               set revert_state normal
> +                       } else {
> +                               set revert_state disabled
> +                       }
>                 }
> +
>                 $ctxm entryconf $::ui_diff_applyhunk -state $s -label $l
>                 $ctxm entryconf $::ui_diff_applyline -state $s -label $t
> +               $ctxm entryconf $::ui_diff_revertline -state $revert_state \
> +                       -label $r

so you have the 'Revert Line(s)'  menu entry always in the context
menu, also when the context menu was opened for an staged file (than
the menu entry is only disabled)? I think this is a step backwards
from my original patch (which isn't mentioned/referenced at all in
this patch anyway).

My orignal patch also had this hunk in lib/diff.tcl:

@@ -614,6 +619,8 @@ proc apply_hunk {x y} {

     if {$current_diff_side eq $ui_index} {
         set mi ${o}M
+    } elseif {$revert} {
+        set mi "[string index $mi 0]$o"
     } elseif {[string index $mi 0] eq {_}} {
         set mi M$o
     } else {

which is missing here. I cannot remember why I added this here. But
maybe you can?

Best,
Bert

>                 tk_popup $ctxm $X $Y
>         }
>  }
> diff --git a/lib/diff.tcl b/lib/diff.tcl
> index 4cae10a..00b15f5 100644
> --- a/lib/diff.tcl
> +++ b/lib/diff.tcl
> @@ -640,7 +640,7 @@ proc apply_hunk {x y} {
>         }
>  }
>
> -proc apply_range_or_line {x y} {
> +proc apply_or_revert_range_or_line {x y revert} {
>         global current_diff_path current_diff_header current_diff_side
>         global ui_diff ui_index file_states
>
> @@ -660,25 +660,46 @@ proc apply_range_or_line {x y} {
>         if {$current_diff_path eq {} || $current_diff_header eq {}} return
>         if {![lock_index apply_hunk]} return
>
> -       set apply_cmd {apply --cached --whitespace=nowarn}
> +       set apply_cmd {apply --whitespace=nowarn}
>         set mi [lindex $file_states($current_diff_path) 0]
>         if {$current_diff_side eq $ui_index} {
>                 set failed_msg [mc "Failed to unstage selected line."]
>                 set to_context {+}
> -               lappend apply_cmd --reverse
> +               lappend apply_cmd --reverse --cached
>                 if {[string index $mi 0] ne {M}} {
>                         unlock_index
>                         return
>                 }
>         } else {
> -               set failed_msg [mc "Failed to stage selected line."]
> -               set to_context {-}
> +               if {$revert} {
> +                       set failed_msg [mc "Failed to revert selected line."]
> +                       set to_context {+}
> +                       lappend apply_cmd --reverse
> +               } else {
> +                       set failed_msg [mc "Failed to stage selected line."]
> +                       set to_context {-}
> +                       lappend apply_cmd --cached
> +               }
> +
>                 if {[string index $mi 1] ne {M}} {
>                         unlock_index
>                         return
>                 }
>         }
>
> +       if {$revert} {
> +               set query "[mc "Revert changes in file %s?" \
> +                       [short_path $current_diff_path]]
> +
> +[mc "The selected lines will be permanently lost by the revert."]"
> +
> +               set reply [revert_dialog $query]
> +               if {$reply ne 1} {
> +                       unlock_index
> +                       return
> +               }
> +       }
> +
>         set wholepatch {}
>
>         while {$first_l < $last_l} {
> --
> 2.21.0
>