Re: git gui diff widget (was Re: [msysGit] Re: [cheetah] Questions about NOTES)

> Here is a patch to gitk that allows to run an external diff viewer.
> I think it might be a suitable solution.
> It can be configured in Edit/Preferences/External diff tool.
>
> To see the diff between two files:
> - select revisions to diff
> - right click on a file in the patched files list view
> - choose "External diff"
>
> Any feedback is welcome.

> Subject: [PATCH] gitk : External diff viewer.
>
> Right click on patched file list view gives "External diff" popup  
> menu entry,
> launching selected external diff tool.
>
> Signed-off-by: Thomas Arcila <tarcila-s5SjKpinsOs@public.gmane.org>
> ---
>  gitk |  109 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 
> ++++++++--
>  1 files changed, 105 insertions(+), 4 deletions(-)
>
> diff --git a/gitk-git/gitk b/gitk-git/gitk
> index 5560e4d..0e2c902 100755
> --- a/gitk-git/gitk
> +++ b/gitk-git/gitk

> @@ -1747,6 +1762,78 @@ proc flist_hl {only} {
>      set gdttype [mc "touching paths:"]
>  }
>
> +proc external_diff {} {
> +  global gitktmpdir nullid nullid2
> +  global flist_menu_file
> +  global diffids
> +  global diffnum
> +  global gitdir extdifftool
> +
> +  set diffidto [lindex $diffids 0]
> +
> +  if {[llength $diffids] == 1} {
> +    # no reference commit given
> +    set diffidto [lindex $diffids 0]
> +    if {$diffidto eq $nullid || $diffidto eq $nullid2} {
> +      # diffing working copy with HEAD

> +      set diffidfrom "HEAD"
> +    } else {
> +      # use parent commit
> +      global allparents
> +      set diffidfrom $allparents($diffidto)
> +    }
> +  } else {
> +    set diffidfrom [lindex $diffids 0]
> +    set diffidto [lindex $diffids 1]
> +  }
> +
> +  if {! [info exists diffnum]} {
> +    set diffnum 0
> +  } else {
> +    set diffnum [expr $diffnum + 1]
> +  }
> +
> +
> +  set diffdir [file join $gitktmpdir "$diffnum"]
> +  set diffok "true"
> +
> +  file mkdir $diffdir
> +  if {$diffidto eq $nullid || $diffidto eq $nullid2} {
> +    set difftofile [file join $gitdir ".." $flist_menu_file]

> +  } {
> +    set difftofile [file join $diffdir "\[$diffidto\] [file tail  
> $flist_menu_file]"]
> +    if {[catch {exec git show $diffidto:$flist_menu_file >  
> $difftofile} err]} {
> +      error_popup "\"$flist_menu_file\" [mc "cannot be found in  
> revision"] $diffidto. [mc "File has probably been created, \
> +                  deleted or renamed, in a different commit."]"
> +      set diffok "false"
> +    }
> +  }
> +
> +  if {$diffidfrom == $nullid || $diffidfrom == $nullid2} {
> +    set difffromfile [file join $gitdir ".." $flist_menu_file]

> +  } else {
> +    set difffromfile [file join $diffdir "\[$diffidfrom\] [file  
> tail $flist_menu_file]"]
> +    if {[catch {exec git show $diffidfrom:$flist_menu_file >  
> $difffromfile} err]} {
> +      error_popup "\"$flist_menu_file\" [mc "cannot be found in  
> revision"] $diffidfrom. [mc "File has probably been created, \
> +                  deleted or renamed, in a different commit."]"
> +      set diffok "false"
> +    }
> +  }
> +
> +  if {$diffok} {
> +    # here we don't use shellquote because \ and everything must  
> be escaped and not enclosed between ''
> +    set quotedextdifftool \"[string map {\" \\\" \\ \\\\ \  \\\ }  
> $extdifftool]\"
> +    set cmd [concat | $quotedextdifftool [shellarglist [list  
> $difffromfile $difftofile]]]
> +    if {[catch {set fl [open $cmd]} err]} {
> +      file delete -force [ file join $gitktmpdir $diffnum ]
> +      error_popup [mc "$extdifftool command failed: $err"]
> +    } else {
> +      fconfigure $fl -blocking 0
> +      filerun $fl [list file delete -force [file join $gitktmpdir  
> $diffnum]]
> +    }
> +  }
> +}
> +
>

>  # Functions for adding and removing shell-type quoting
>
>  proc shellquote {str} {
> @@ -7802,9 +7889,13 @@ proc showtag {tag isnew} {
>
>  proc doquit {} {
>      global stopped
> +    global gitktmpdir
> +
>      set stopped 100
>      savestuff .
>      destroy .
> +
> +    catch {file delete -force $gitktmpdir}
>  }
>
>  proc mkfontdisp {font top which} {
> @@ -7933,7 +8024,7 @@ proc doprefs {} {
>      global maxwidth maxgraphpct
>      global oldprefs prefstop showneartags showlocalchanges
>      global bgcolor fgcolor ctext diffcolors selectbgcolor
> -    global tabstop limitdiffs
> +    global tabstop limitdiffs extdifftool
>
>      set top .gitkprefs
>      set prefstop $top
> @@ -7980,6 +8071,11 @@ proc doprefs {} {
>      pack $top.ldiff.b $top.ldiff.l -side left
>      grid x $top.ldiff -sticky w
>
> +    entry $top.extdifft -textvariable extdifftool
> +    button $top.extdiffb -text [mc "External diff tool" ] -font  
> optionfont -command {set extdifftool [tk_getOpenFile -title  
> "External diff tool" -multiple "false"]}