[PATCH v2] git-gui: simplify using nice(1)

[Mark Levedahl <mlevedahl@gmail.com>]

git-gui invokes some long running commands using "nice git $cmd" if nice
is found and works, otherwise just "git $cmd".  The current code is more
complex than needed; lets simplify it.

Signed-off-by: Mark Levedahl <mlevedahl@gmail.com>
---
updates from v1:
- _which does not return a list, _nice must be a list to handle path
  with spaces  (should have been in v1, was in another patch - oops)
- Address Kristoffer Haugsbakk's comments

 git-gui.sh | 30 +++++++-----------------------
 1 file changed, 7 insertions(+), 23 deletions(-)

diff --git a/git-gui.sh b/git-gui.sh
index 4528b22..be0b8d9 100755
--- a/git-gui.sh
+++ b/git-gui.sh
@@ -578,21 +578,6 @@ proc open_cmd_pipe {cmd path} {
 	return [open |$run r]
 }
 
-proc _lappend_nice {cmd_var} {
-	global _nice
-	upvar $cmd_var cmd
-
-	if {![info exists _nice]} {
-		set _nice [_which nice]
-		if {[catch {safe_exec [list $_nice git version]}]} {
-			set _nice {}
-		}
-	}
-	if {$_nice ne {}} {
-		lappend cmd $_nice
-	}
-}
-
 proc git {args} {
 	git_redir $args {}
 }
@@ -626,15 +611,14 @@ proc git_read {cmd {redir {}}} {
 	return [safe_open_command $cmdp $redir]
 }
 
-proc git_read_nice {cmd} {
-	global _git
-	set opt [list]
-
-	_lappend_nice opt
-
-	set cmdp [concat [list $_git] $cmd]
+set _nice [list [_which nice]]
+if {[catch {safe_exec [list {*}$_nice git version]}]} {
+	set _nice {}
+}
 
-	return [safe_open_command [concat $opt $cmdp]]
+proc git_read_nice {cmd} {
+	set cmdp [list {*}$::_nice $::_git {*}$cmd]
+	return [safe_open_command $cmdp]
 }
 
 proc git_write {cmd} {
-- 
2.51.0.99.15