git-gui: Don't nice git blame on MSYS as nice is not supported

spearce · spearce · commit fffaaba3588b · 2007-06-27T00:27:13.000-04:00
Johannes Sixt reported that MinGW/MSYS does not have a nice.exe to
drop the priority of a child process when it gets spawned.  So we
have to avoid trying to start `git blame` through nice when we are
on Windows and do not have Cygwin available to us.

Signed-off-by: Shawn O. Pearce &lt;spearce@spearce.org&gt;
diff --git a/lib/blame.tcl b/lib/blame.tcl
@@ -487,7 +487,11 @@ method _read_file {fd jump} {
 } ifdeleted { catch {close $fd} }
 
 method _exec_blame {cur_w cur_d options cur_s} {
-	set cmd [list nice git blame]
+	set cmd [list]
+	if {![is_Windows] || [is_Cygwin]} {
+		lappend cmd nice
+	}
+	lappend cmd git blame
 	set cmd [concat $cmd $options]
 	lappend cmd --incremental
 	if {$commit eq {}} {
