git-gui: Use progress bar while resetting/aborting files

Resetting a large number of files on a slow filesystem can take
considerable time, just as switching branches in such a case can
take more than two seconds.  We now take advantage of the progress
meter output by read-tree and show it in the main window status
bar, just like we do during checkout (branch switch).

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

diff --git a/lib/merge.tcl b/lib/merge.tcl
index f6a2df3c064b3132d7607211656a7aee53638881..66d1bcd8263e4a346993d9cfa99cbde080959a7b 100644 (file)
--- a/lib/merge.tcl
+++ b/lib/merge.tcl
@@ -233,10 +233,10 @@ Continue with resetting the current changes?"
        }
 
        if {[ask_popup $op_question] eq {yes}} {
-               set fd [git_read read-tree --reset -u HEAD]
+               set fd [git_read --stderr read-tree --reset -u -v HEAD]
                fconfigure $fd -blocking 0 -translation binary
                fileevent $fd readable [namespace code [list _reset_wait $fd]]
-               ui_status {Aborting... please wait...}
+               $::main_status start {Aborting} {files reset}
        } else {
                unlock_index
        }
@@ -245,9 +245,12 @@ Continue with resetting the current changes?"
 proc _reset_wait {fd} {
        global ui_comm
 
-       read $fd
+       $::main_status update_meter [read $fd]
+
+       fconfigure $fd -blocking 1
        if {[eof $fd]} {
-               close $fd
+               set fail [catch {close $fd} err]
+               $::main_status stop
                unlock_index
 
                $ui_comm delete 0.0 end
@@ -259,7 +262,12 @@ proc _reset_wait {fd} {
                catch {file delete [gitdir MERGE_MSG]}
                catch {file delete [gitdir GITGUI_MSG]}
 
+               if {$fail} {
+                       warn_popup "Abort failed.\n\n$err"
+               }
                rescan {ui_status {Abort completed.  Ready.}}
+       } else {
+               fconfigure $fd -blocking 0
        }
 }