git-gui: Move feature option selection before GIT_DIR init

By moving our feature option determination up before we look for GIT_DIR
we can make a decision about whether or not we need a working tree up
front, before we look for GIT_DIR.  A future change could then allow
us to start in a bare Git repository if we only need access to the ODB.

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

git-gui.sh

@@ -630,6 +630,43 @@ You are using [git-version]:
 	exit 1
 }
 
+######################################################################
+##
+## feature option selection
+
+if {[regexp {^git-(.+)$} [appname] _junk subcommand]} {
+	unset _junk
+} else {
+	set subcommand gui
+}
+if {$subcommand eq {gui.sh}} {
+	set subcommand gui
+}
+if {$subcommand eq {gui} && [llength $argv] > 0} {
+	set subcommand [lindex $argv 0]
+	set argv [lrange $argv 1 end]
+}
+
+enable_option multicommit
+enable_option branch
+enable_option transport
+
+switch -- $subcommand {
+browser -
+blame {
+	disable_option multicommit
+	disable_option branch
+	disable_option transport
+}
+citool {
+	enable_option singlecommit
+
+	disable_option multicommit
+	disable_option branch
+	disable_option transport
+}
+}
+
 ######################################################################
 ##
 ## repository setup
@@ -1596,43 +1633,6 @@ set font_descs {
 load_config 0
 apply_config
 
-######################################################################
-##
-## feature option selection
-
-if {[regexp {^git-(.+)$} [appname] _junk subcommand]} {
-	unset _junk
-} else {
-	set subcommand gui
-}
-if {$subcommand eq {gui.sh}} {
-	set subcommand gui
-}
-if {$subcommand eq {gui} && [llength $argv] > 0} {
-	set subcommand [lindex $argv 0]
-	set argv [lrange $argv 1 end]
-}
-
-enable_option multicommit
-enable_option branch
-enable_option transport
-
-switch -- $subcommand {
-browser -
-blame {
-	disable_option multicommit
-	disable_option branch
-	disable_option transport
-}
-citool {
-	enable_option singlecommit
-
-	disable_option multicommit
-	disable_option branch
-	disable_option transport
-}
-}
-
 ######################################################################
 ##
 ## ui construction