merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'

1 files changed, 281 insertions, 0 deletions

diff --git a/third_party/git/git-gui/lib/merge.tcl b/third_party/git/git-gui/lib/merge.tcl
new file mode 100644
index 000000000000..9f253db5b37e
--- /dev/null
+++ b/third_party/git/git-gui/lib/merge.tcl
@@ -0,0 +1,281 @@
+# git-gui branch merge support
+# Copyright (C) 2006, 2007 Shawn Pearce
+
+class merge {
+
+field w         ; # top level window
+field w_rev     ; # mega-widget to pick the revision to merge
+
+method _can_merge {} {
+	global HEAD commit_type file_states
+
+	if {[string match amend* $commit_type]} {
+		info_popup [mc "Cannot merge while amending.
+
+You must finish amending this commit before starting any type of merge.
+"]
+		return 0
+	}
+
+	if {[committer_ident] eq {}} {return 0}
+	if {![lock_index merge]} {return 0}
+
+	# -- Our in memory state should match the repository.
+	#
+	repository_state curType curHEAD curMERGE_HEAD
+	if {$commit_type ne $curType || $HEAD ne $curHEAD} {
+		info_popup [mc "Last scanned state does not match repository state.
+
+Another Git program has modified this repository since the last scan.  A rescan must be performed before a merge can be performed.
+
+The rescan will be automatically started now.
+"]
+		unlock_index
+		rescan ui_ready
+		return 0
+	}
+
+	foreach path [array names file_states] {
+		switch -glob -- [lindex $file_states($path) 0] {
+		_O {
+			continue; # and pray it works!
+		}
+		_U -
+		U? {
+			error_popup [mc "You are in the middle of a conflicted merge.
+
+File %s has merge conflicts.
+
+You must resolve them, stage the file, and commit to complete the current merge.  Only then can you begin another merge.
+" [short_path $path]]
+			unlock_index
+			return 0
+		}
+		?? {
+			error_popup [mc "You are in the middle of a change.
+
+File %s is modified.
+
+You should complete the current commit before starting a merge.  Doing so will help you abort a failed merge, should the need arise.
+" [short_path $path]]
+			unlock_index
+			return 0
+		}
+		}
+	}
+
+	return 1
+}
+
+method _rev {} {
+	if {[catch {$w_rev commit_or_die}]} {
+		return {}
+	}
+	return [$w_rev get]
+}
+
+method _visualize {} {
+	set rev [_rev $this]
+	if {$rev ne {}} {
+		do_gitk [list $rev --not HEAD]
+	}
+}
+
+method _start {} {
+	global HEAD current_branch remote_url
+	global _last_merged_branch
+
+	set name [_rev $this]
+	if {$name eq {}} {
+		return
+	}
+
+	set spec [$w_rev get_tracking_branch]
+	set cmit [$w_rev get_commit]
+
+	set fh [open [gitdir FETCH_HEAD] w]
+	fconfigure $fh -translation lf
+	if {$spec eq {}} {
+		set remote .
+		set branch $name
+		set stitle $branch
+	} else {
+		set remote $remote_url([lindex $spec 1])
+		if {[regexp {^[^:@]*@[^:]*:/} $remote]} {
+			regsub {^[^:@]*@} $remote {} remote
+		}
+		set branch [lindex $spec 2]
+		set stitle [mc "%s of %s" $branch $remote]
+	}
+	regsub ^refs/heads/ $branch {} branch
+	puts $fh "$cmit\t\tbranch '$branch' of $remote"
+	close $fh
+	set _last_merged_branch $branch
+
+	if {[git-version >= "2.5.0"]} {
+		set cmd [list git merge --strategy=recursive FETCH_HEAD]
+	} else {
+		set cmd [list git]
+		lappend cmd merge
+		lappend cmd --strategy=recursive
+		lappend cmd [git fmt-merge-msg <[gitdir FETCH_HEAD]]
+		lappend cmd HEAD
+		lappend cmd $name
+	}
+
+	ui_status [mc "Merging %s and %s..." $current_branch $stitle]
+	set cons [console::new [mc "Merge"] "merge $stitle"]
+	console::exec $cons $cmd [cb _finish $cons]
+
+	wm protocol $w WM_DELETE_WINDOW {}
+	destroy $w
+}
+
+method _finish {cons ok} {
+	console::done $cons $ok
+	if {$ok} {
+		set msg [mc "Merge completed successfully."]
+	} else {
+		set msg [mc "Merge failed.  Conflict resolution is required."]
+	}
+	unlock_index
+	rescan [list ui_status $msg]
+	delete_this
+}
+
+constructor dialog {} {
+	global current_branch
+	global M1B use_ttk NS
+
+	if {![_can_merge $this]} {
+		delete_this
+		return
+	}
+
+	make_dialog top w
+	wm title $top [mc "%s (%s): Merge" [appname] [reponame]]
+	if {$top ne {.}} {
+		wm geometry $top "+[winfo rootx .]+[winfo rooty .]"
+	}
+
+	set _start [cb _start]
+
+	${NS}::label $w.header \
+		-text [mc "Merge Into %s" $current_branch] \
+		-font font_uibold
+	pack $w.header -side top -fill x
+
+	${NS}::frame $w.buttons
+	${NS}::button $w.buttons.visualize \
+		-text [mc Visualize] \
+		-command [cb _visualize]
+	pack $w.buttons.visualize -side left
+	${NS}::button $w.buttons.merge \
+		-text [mc Merge] \
+		-command $_start
+	pack $w.buttons.merge -side right
+	${NS}::button $w.buttons.cancel \
+		-text [mc "Cancel"] \
+		-command [cb _cancel]
+	pack $w.buttons.cancel -side right -padx 5
+	pack $w.buttons -side bottom -fill x -pady 10 -padx 10
+
+	set w_rev [::choose_rev::new_unmerged $w.rev [mc "Revision To Merge"]]
+	pack $w.rev -anchor nw -fill both -expand 1 -pady 5 -padx 5
+
+	bind $w <$M1B-Key-Return> $_start
+	bind $w <Key-Return> $_start
+	bind $w <Key-Escape> [cb _cancel]
+	wm protocol $w WM_DELETE_WINDOW [cb _cancel]
+
+	bind $w.buttons.merge <Visibility> [cb _visible]
+	tkwait window $w
+}
+
+method _visible {} {
+	grab $w
+	if {[is_config_true gui.matchtrackingbranch]} {
+		$w_rev pick_tracking_branch
+	}
+	$w_rev focus_filter
+}
+
+method _cancel {} {
+	wm protocol $w WM_DELETE_WINDOW {}
+	unlock_index
+	destroy $w
+	delete_this
+}
+
+}
+
+namespace eval merge {
+
+proc reset_hard {} {
+	global HEAD commit_type file_states
+
+	if {[string match amend* $commit_type]} {
+		info_popup [mc "Cannot abort while amending.
+
+You must finish amending this commit.
+"]
+		return
+	}
+
+	if {![lock_index abort]} return
+
+	if {[string match *merge* $commit_type]} {
+		set op_question [mc "Abort merge?
+
+Aborting the current merge will cause *ALL* uncommitted changes to be lost.
+
+Continue with aborting the current merge?"]
+	} else {
+		set op_question [mc "Reset changes?
+
+Resetting the changes will cause *ALL* uncommitted changes to be lost.
+
+Continue with resetting the current changes?"]
+	}
+
+	if {[ask_popup $op_question] eq {yes}} {
+		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]]
+		$::main_status start [mc "Aborting"] [mc "files reset"]
+	} else {
+		unlock_index
+	}
+}
+
+proc _reset_wait {fd} {
+	global ui_comm
+
+	$::main_status update_meter [read $fd]
+
+	fconfigure $fd -blocking 1
+	if {[eof $fd]} {
+		set fail [catch {close $fd} err]
+		$::main_status stop
+		unlock_index
+
+		$ui_comm delete 0.0 end
+		$ui_comm edit modified false
+
+		catch {file delete [gitdir MERGE_HEAD]}
+		catch {file delete [gitdir rr-cache MERGE_RR]}
+		catch {file delete [gitdir MERGE_RR]}
+		catch {file delete [gitdir SQUASH_MSG]}
+		catch {file delete [gitdir MERGE_MSG]}
+		catch {file delete [gitdir GITGUI_MSG]}
+
+		if {$fail} {
+			warn_popup "[mc "Abort failed."]\n\n$err"
+		}
+		rescan {ui_status [mc "Abort completed.  Ready."]}
+	} else {
+		fconfigure $fd -blocking 0
+	}
+}
+
+}