From 586a66b3a47942c1148139b4baf0059d2f73bd68 Mon Sep 17 00:00:00 2001
From: Zachary Yedidia <zyedidia@gmail.com>
Date: Sun, 7 Aug 2016 19:45:35 -0400
Subject: [PATCH] Bindings for IndentSelection and OutdentSelection

Tab is now bound to both IndentSelection and InsertTab.

There is currently no binding for OutdentSelection (the user can
bind that to their liking). Hopefully in the future it can be bound
to shift-tab but tcell does currently support that.

Closes #203
---
 cmd/micro/actions.go  | 92 +++++++++++++++++++++++++++++++++++++------
 cmd/micro/bindings.go |  4 +-
 2 files changed, 83 insertions(+), 13 deletions(-)

diff --git a/cmd/micro/actions.go b/cmd/micro/actions.go
index 58040a55..e2da61be 100644
--- a/cmd/micro/actions.go
+++ b/cmd/micro/actions.go
@@ -305,23 +305,91 @@ func (v *View) Delete() bool {
 	return true
 }
 
-// InsertTab inserts a tab or spaces
-func (v *View) InsertTab() bool {
-	// Insert a tab
+// IndentSelection indents the current selection
+func (v *View) IndentSelection() bool {
 	if v.Cursor.HasSelection() {
-		if v.Cursor.CurSelection[0].Y != v.Cursor.CurSelection[1].Y {
-			for i := v.Cursor.CurSelection[0].Y; i <= v.Cursor.CurSelection[1].Y; i++ {
-				if settings["tabstospaces"].(bool) {
-					v.Buf.Insert(Loc{0, i}, Spaces(int(settings["tabsize"].(float64))))
-				} else {
-					v.Buf.Insert(Loc{0, i}, "\t")
+		start := v.Cursor.CurSelection[0].Y
+		end := v.Cursor.CurSelection[1].Move(-1, v.Buf).Y
+		endX := v.Cursor.CurSelection[1].Move(-1, v.Buf).X
+		for i := start; i <= end; i++ {
+			if settings["tabstospaces"].(bool) {
+				tabsize := int(settings["tabsize"].(float64))
+				v.Buf.Insert(Loc{0, i}, Spaces(tabsize))
+				if i == start {
+					if v.Cursor.CurSelection[0].X > 0 {
+						v.Cursor.CurSelection[0] = v.Cursor.CurSelection[0].Move(tabsize, v.Buf)
+					}
+				}
+				if i == end {
+					v.Cursor.CurSelection[1] = Loc{endX + tabsize + 1, end}
+				}
+			} else {
+				v.Buf.Insert(Loc{0, i}, "\t")
+				if i == start {
+					if v.Cursor.CurSelection[0].X > 0 {
+						v.Cursor.CurSelection[0] = v.Cursor.CurSelection[0].Move(1, v.Buf)
+					}
+				}
+				if i == end {
+					v.Cursor.CurSelection[1] = Loc{endX + 2, end}
 				}
 			}
-			return true
 		}
-		v.Cursor.DeleteSelection()
-		v.Cursor.ResetSelection()
+		v.Cursor.Relocate()
+		return true
 	}
+	return false
+}
+
+// OutdentSelection takes the current selection and moves it back one indent level
+func (v *View) OutdentSelection() bool {
+	if v.Cursor.HasSelection() {
+		start := v.Cursor.CurSelection[0].Y
+		end := v.Cursor.CurSelection[1].Move(-1, v.Buf).Y
+		endX := v.Cursor.CurSelection[1].Move(-1, v.Buf).X
+		for i := start; i <= end; i++ {
+			if len(GetLeadingWhitespace(v.Buf.Line(i))) > 0 {
+				if settings["tabstospaces"].(bool) {
+					tabsize := int(settings["tabsize"].(float64))
+					for j := 0; j < tabsize; j++ {
+						if len(GetLeadingWhitespace(v.Buf.Line(i))) == 0 {
+							break
+						}
+						v.Buf.Remove(Loc{0, i}, Loc{1, i})
+						if i == start {
+							if v.Cursor.CurSelection[0].X > 0 {
+								v.Cursor.CurSelection[0] = v.Cursor.CurSelection[0].Move(-1, v.Buf)
+							}
+						}
+						if i == end {
+							v.Cursor.CurSelection[1] = Loc{endX, end}
+						}
+					}
+				} else {
+					v.Buf.Remove(Loc{0, i}, Loc{1, i})
+					if i == start {
+						if v.Cursor.CurSelection[0].X > 0 {
+							v.Cursor.CurSelection[0] = v.Cursor.CurSelection[0].Move(-1, v.Buf)
+						}
+					}
+					if i == end {
+						v.Cursor.CurSelection[1] = Loc{endX, end}
+					}
+				}
+			}
+		}
+		v.Cursor.Relocate()
+		return true
+	}
+	return false
+}
+
+// InsertTab inserts a tab or spaces
+func (v *View) InsertTab() bool {
+	if v.Cursor.HasSelection() {
+		return false
+	}
+	// Insert a tab
 	if settings["tabstospaces"].(bool) {
 		tabSize := int(settings["tabsize"].(float64))
 		v.Buf.Insert(v.Cursor.Loc, Spaces(tabSize))
diff --git a/cmd/micro/bindings.go b/cmd/micro/bindings.go
index 85d5357b..0d7a034b 100644
--- a/cmd/micro/bindings.go
+++ b/cmd/micro/bindings.go
@@ -51,6 +51,8 @@ var bindingActions = map[string]func(*View) bool{
 	"CutLine":             (*View).CutLine,
 	"DuplicateLine":       (*View).DuplicateLine,
 	"DeleteLine":          (*View).DeleteLine,
+	"IndentSelection":     (*View).IndentSelection,
+	"OutdentSelection":    (*View).OutdentSelection,
 	"Paste":               (*View).Paste,
 	"SelectAll":           (*View).SelectAll,
 	"OpenFile":            (*View).OpenFile,
@@ -367,7 +369,7 @@ func DefaultBindings() map[string]string {
 		"Backspace2":     "Backspace",
 		"Alt-Backspace":  "DeleteWordLeft",
 		"Alt-Backspace2": "DeleteWordLeft",
-		"Tab":            "InsertTab",
+		"Tab":            "IndentSelection,InsertTab",
 		"CtrlO":          "OpenFile",
 		"CtrlS":          "Save",
 		"CtrlF":          "Find",