This enables git-gui to be started with the clone dialog opened right
away, possibly with the URL prefilled when it is passed as another
argument. git-gui can then be e.g. registered as the git:// protocol
handler.

This is just a simple implementation - we construct the front actions
page, then throw it away immediately; I wanted to avoid unnecessary
refactoring and complication of the code, though.

Signed-off-by: Petr Baudis <petr.baudis@novartis.com>

---
 Documentation/git-gui.txt         |    5 +++++
 git-gui/git-gui.sh                |   21 ++++++++++++++++++---
 git-gui/lib/choose_repository.tcl |   11 ++++++++++-
 3 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/Documentation/git-gui.txt b/Documentation/git-gui.txt
index 0e650f4..9ce63be 100644
--- a/Documentation/git-gui.txt
+++ b/Documentation/git-gui.txt
@@ -43,6 +43,11 @@ citool::
 	to only commit actions, slightly reducing the application's
 	startup time and simplifying the menubar.
 
+clone::
+	Start the 'git-gui' clone dialog, optionally taking
+	a source location as an extra argument to pre-fill
+	in the dialog.
+
 version::
 	Display the currently running version of 'git-gui'.
 
diff --git a/git-gui/git-gui.sh b/git-gui/git-gui.sh
index 4085e8f..86f0151 100755
--- a/git-gui/git-gui.sh
+++ b/git-gui/git-gui.sh
@@ -950,6 +950,8 @@ enable_option multicommit
 enable_option branch
 enable_option transport
 disable_option bare
+set init_action {}
+set clone_url {}
 
 switch -- $subcommand {
 browser -
@@ -960,6 +962,13 @@ blame {
 	disable_option branch
 	disable_option transport
 }
+clone {
+	set init_action "clone"
+	if {[llength $argv] > 0} {
+		set clone_url [lindex $argv 0]
+		set argv [lrange $argv 1 end]
+	}
+}
 citool {
 	enable_option singlecommit
 	enable_option retcode
@@ -995,7 +1004,12 @@ citool {
 ##
 ## repository setup
 
-if {[catch {
+if {$init_action != ""} {
+	load_config 1
+	apply_config
+	choose_repository::pick $init_action
+
+} elseif {[catch {
 		set _gitdir $env(GIT_DIR)
 		set _prefix {}
 		}]
@@ -1005,7 +1019,7 @@ if {[catch {
 	} err]} {
 	load_config 1
 	apply_config
-	choose_repository::pick
+	choose_repository::pick {}
 }
 if {![file isdirectory $_gitdir] && [is_Cygwin]} {
 	catch {set _gitdir [exec cygpath --windows $_gitdir]}
@@ -2622,6 +2636,7 @@ blame {
 	return
 }
 citool -
+clone -
 gui {
 	if {[llength $argv] != 0} {
 		puts -nonewline stderr "usage: $argv0"
@@ -2635,7 +2650,7 @@ gui {
 	# fall through to setup UI for commits
 }
 default {
-	puts stderr "usage: $argv0 \[{blame|browser|citool}\]"
+	puts stderr "usage: $argv0 \[{blame|browser|citool|clone}\]"
 	exit 1
 }
 }
diff --git a/git-gui/lib/choose_repository.tcl b/git-gui/lib/choose_repository.tcl
index 3180786..290fbc0 100644
--- a/git-gui/lib/choose_repository.tcl
+++ b/git-gui/lib/choose_repository.tcl
@@ -21,7 +21,7 @@ field clone_type hardlink ; # Type of clone to construct
 field readtree_err        ; # Error output from read-tree (if any)
 field sorted_recent       ; # recent repositories (sorted)
 
-constructor pick {} {
+constructor pick {action} {
 	global M1T M1B
 
 	make_toplevel top w
@@ -195,6 +195,11 @@ constructor pick {} {
 		bind $top <Visibility> {}
 	"
 	wm deiconify $top
+
+	if {$action != ""} {
+		_next $this $action
+	}
+
 	tkwait variable @done
 
 	if {$top eq {.}} {
@@ -447,6 +452,10 @@ proc _new_ok {p} {
 ## Clone Existing Repository
 
 method _do_clone {} {
+	if {$::clone_url != ""} {
+		set origin_url $::clone_url
+	}
+
 	$w_next conf \
 		-state disabled \
 		-command [cb _do_clone2] \
-- 
tg: (9800c0d..) t/git-gui/clonecmd (depends on: vanilla/master)
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