Merge git://repo.or.cz/git-gui

* git://repo.or.cz/git-gui:
  git-gui: Implement "Stage/Unstage Line"
  git-gui: Don't select the wrong file if the last listed file is staged.
  git-gui: Fix accidental staged state toggle when clicking top pixel row
  git-gui: Move on to the next filename after staging/unstaging a change

git-gui/git-gui.sh

@@ -1774,6 +1774,11 @@ proc do_commit {} {
 	commit_tree
 }
 
+proc next_diff {} {
+	global next_diff_p next_diff_w next_diff_i
+	show_diff $next_diff_p $next_diff_w $next_diff_i
+}
+
 proc toggle_or_diff {w x y} {
 	global file_states file_lists current_diff_path ui_index ui_workdir
 	global last_clicked selected_paths
@@ -1792,12 +1797,34 @@ proc toggle_or_diff {w x y} {
 	$ui_index tag remove in_sel 0.0 end
 	$ui_workdir tag remove in_sel 0.0 end
 
-	if {$col == 0} {
-		if {$current_diff_path eq $path} {
+	if {$col == 0 && $y > 1} {
+		set i [expr {$lno-1}]
+		set ll [expr {[llength $file_lists($w)]-1}]
+
+		if {$i == $ll && $i == 0} {
 			set after {reshow_diff;}
 		} else {
-			set after {}
+			global next_diff_p next_diff_w next_diff_i
+
+			set next_diff_w $w
+
+			if {$i < $ll} {
+				set i [expr {$i + 1}]
+				set next_diff_i $i
+			} else {
+				set next_diff_i $i
+				set i [expr {$i - 1}]
+			}
+
+			set next_diff_p [lindex $file_lists($w) $i]
+
+			if {$next_diff_p ne {} && $current_diff_path ne {}} {
+				set after {next_diff;}
+			} else {
+				set after {}
+			}
 		}
+
 		if {$w eq $ui_index} {
 			update_indexinfo \
 				"Unstaging [short_path $path] from commit" \
@@ -2639,6 +2666,11 @@ $ctxm add command \
 	-command {apply_hunk $cursorX $cursorY}
 set ui_diff_applyhunk [$ctxm index last]
 lappend diff_actions [list $ctxm entryconf $ui_diff_applyhunk -state]
+$ctxm add command \
+	-label [mc "Apply/Reverse Line"] \
+	-command {apply_line $cursorX $cursorY; do_rescan}
+set ui_diff_applyline [$ctxm index last]
+lappend diff_actions [list $ctxm entryconf $ui_diff_applyline -state]
 $ctxm add separator
 $ctxm add command \
 	-label [mc "Show Less Context"] \
@@ -2687,8 +2719,10 @@ proc popup_diff_menu {ctxm x y X Y} {
 	set ::cursorY $y
 	if {$::ui_index eq $::current_diff_side} {
 		set l [mc "Unstage Hunk From Commit"]
+		set t [mc "Unstage Line From Commit"]
 	} else {
 		set l [mc "Stage Hunk For Commit"]
+		set t [mc "Stage Line For Commit"]
 	}
 	if {$::is_3way_diff
 		|| $current_diff_path eq {}
@@ -2699,6 +2733,7 @@ proc popup_diff_menu {ctxm x y X Y} {
 		set s normal
 	}
 	$ctxm entryconf $::ui_diff_applyhunk -state $s -label $l
+	$ctxm entryconf $::ui_diff_applyline -state $s -label $t
 	tk_popup $ctxm $X $Y
 }
 bind_button3 $ui_diff [list popup_diff_menu $ctxm %x %y %X %Y]

git-gui/lib/diff.tcl

@@ -362,3 +362,90 @@ proc apply_hunk {x y} {
 		set current_diff_path $current_diff_path
 	}
 }
+
+proc apply_line {x y} {
+	global current_diff_path current_diff_header current_diff_side
+	global ui_diff ui_index file_states
+
+	if {$current_diff_path eq {} || $current_diff_header eq {}} return
+	if {![lock_index apply_hunk]} return
+
+	set apply_cmd {apply --cached --whitespace=nowarn}
+	set mi [lindex $file_states($current_diff_path) 0]
+	if {$current_diff_side eq $ui_index} {
+		set failed_msg [mc "Failed to unstage selected line."]
+		set to_context {+}
+		lappend apply_cmd --reverse
+		if {[string index $mi 0] ne {M}} {
+			unlock_index
+			return
+		}
+	} else {
+		set failed_msg [mc "Failed to stage selected line."]
+		set to_context {-}
+		if {[string index $mi 1] ne {M}} {
+			unlock_index
+			return
+		}
+	}
+
+	set the_l [$ui_diff index @$x,$y]
+
+	# operate only on change lines
+	set c1 [$ui_diff get "$the_l linestart"]
+	if {$c1 ne {+} && $c1 ne {-}} {
+		unlock_index
+		return
+	}
+	set sign $c1
+
+	set i_l [$ui_diff search -backwards -regexp ^@@ $the_l 0.0]
+	if {$i_l eq {}} {
+		unlock_index
+		return
+	}
+	# $i_l is now at the beginning of a line
+
+	# pick start line number from hunk header
+	set hh [$ui_diff get $i_l "$i_l + 1 lines"]
+	set hh [lindex [split $hh ,] 0]
+	set hln [lindex [split $hh -] 1]
+
+	set n 0
+	set i_l [$ui_diff index "$i_l + 1 lines"]
+	set patch {}
+	while {[$ui_diff compare $i_l < "end - 1 chars"] &&
+	       [$ui_diff get $i_l "$i_l + 2 chars"] ne {@@}} {
+		set next_l [$ui_diff index "$i_l + 1 lines"]
+		set c1 [$ui_diff get $i_l]
+		if {[$ui_diff compare $i_l <= $the_l] &&
+		    [$ui_diff compare $the_l < $next_l]} {
+			# the line to stage/unstage
+			set ln [$ui_diff get $i_l $next_l]
+			set patch "$patch$ln"
+		} elseif {$c1 ne {-} && $c1 ne {+}} {
+			# context line
+			set ln [$ui_diff get $i_l $next_l]
+			set patch "$patch$ln"
+			set n [expr $n+1]
+		} elseif {$c1 eq $to_context} {
+			# turn change line into context line
+			set ln [$ui_diff get "$i_l + 1 chars" $next_l]
+			set patch "$patch $ln"
+			set n [expr $n+1]
+		}
+		set i_l $next_l
+	}
+	set patch "@@ -$hln,$n +$hln,[eval expr $n $sign 1] @@\n$patch"
+
+	if {[catch {
+		set p [eval git_write $apply_cmd]
+		fconfigure $p -translation binary -encoding binary
+		puts -nonewline $p $current_diff_header
+		puts -nonewline $p $patch
+		close $p} err]} {
+		error_popup [append $failed_msg "\n\n$err"]
+	}
+
+	unlock_index
+}