From ec221c0bc403b3501ff046b146573cdfd6640465 Mon Sep 17 00:00:00 2001
From: Nitish Sakhawalkar <nitsakh@icloud.com>
Date: Mon, 2 Oct 2017 19:01:01 -0700
Subject: [PATCH] Implementation of Paragraph Feature

Changes to support moving cursor to next and previous paragraph
and updates to corresponding documentation
---
 cmd/micro/actions.go        | 49 +++++++++++++++++++++++++++++++++++++
 cmd/micro/bindings.go       |  4 +++
 runtime/help/defaultkeys.md |  2 ++
 runtime/help/keybindings.md |  4 +++
 4 files changed, 59 insertions(+)

diff --git a/cmd/micro/actions.go b/cmd/micro/actions.go
index d5d52065..54873e82 100644
--- a/cmd/micro/actions.go
+++ b/cmd/micro/actions.go
@@ -493,6 +493,55 @@ func (v *View) SelectToEndOfLine(usePlugin bool) bool {
 	return true
 }
 
+// ParagraphPrevious moves the cursor to the previous empty line, or beginning of the buffer if there's none
+func (v *View) ParagraphPrevious(usePlugin bool) bool {
+	if usePlugin && !PreActionCall("ParagraphPrevious", v) {
+		return false
+	}
+	var line int
+	for line = v.Cursor.Y; line > 0; line-- {
+		if len(v.Buf.lines[line].data) == 0 && line != v.Cursor.Y {
+			v.Cursor.X = 0
+			v.Cursor.Y = line
+			break
+		}
+	}
+	// If no empty line found. move cursor to end of buffer
+	if line == 0 {
+		v.Cursor.Loc = v.Buf.Start()
+	}
+
+	if usePlugin {
+		return PostActionCall("ParagraphPrevious", v)
+	}
+	return true
+}
+
+// ParagraphNext moves the cursor to the next empty line, or end of the buffer if there's none
+func (v *View) ParagraphNext(usePlugin bool) bool {
+	if usePlugin && !PreActionCall("ParagraphNext", v) {
+		return false
+	}
+
+	var line int
+	for line = v.Cursor.Y; line < len(v.Buf.lines); line++ {
+		if len(v.Buf.lines[line].data) == 0 && line != v.Cursor.Y {
+			v.Cursor.X = 0
+			v.Cursor.Y = line
+			break
+		}
+	}
+	// If no empty line found. move cursor to end of buffer
+	if line == len(v.Buf.lines) {
+		v.Cursor.Loc = v.Buf.End()
+	}
+
+	if usePlugin {
+		return PostActionCall("ParagraphNext", v)
+	}
+	return true
+}
+
 // CursorStart moves the cursor to the start of the buffer
 func (v *View) CursorStart(usePlugin bool) bool {
 	if usePlugin && !PreActionCall("CursorStart", v) {
diff --git a/cmd/micro/bindings.go b/cmd/micro/bindings.go
index b62be8b3..8ce46ae4 100644
--- a/cmd/micro/bindings.go
+++ b/cmd/micro/bindings.go
@@ -41,6 +41,8 @@ var bindingActions = map[string]func(*View, bool) bool{
 	"DeleteWordLeft":        (*View).DeleteWordLeft,
 	"SelectToStartOfLine":   (*View).SelectToStartOfLine,
 	"SelectToEndOfLine":     (*View).SelectToEndOfLine,
+	"ParagraphPrevious":     (*View).ParagraphPrevious,
+	"ParagraphNext":         (*View).ParagraphNext,
 	"InsertNewline":         (*View).InsertNewline,
 	"InsertSpace":           (*View).InsertSpace,
 	"Backspace":             (*View).Backspace,
@@ -458,6 +460,8 @@ func DefaultBindings() map[string]string {
 		"CtrlDown":       "CursorEnd",
 		"CtrlShiftUp":    "SelectToStart",
 		"CtrlShiftDown":  "SelectToEnd",
+		"Alt-{":          "ParagraphPrevious",
+		"Alt-}":          "ParagraphNext",
 		"Enter":          "InsertNewline",
 		"CtrlH":          "Backspace",
 		"Backspace":      "Backspace",
diff --git a/runtime/help/defaultkeys.md b/runtime/help/defaultkeys.md
index 177ea025..ffba008a 100644
--- a/runtime/help/defaultkeys.md
+++ b/runtime/help/defaultkeys.md
@@ -25,6 +25,8 @@ If you don't like it, you can change it!
 | End or CtrlRightArrow     | Move to the end of the current line                                                       |
 | AltLeftArrow              | Move cursor one word left                                                                 |
 | AltRightArrow             | Move cursor one word right                                                                |
+| Alt+{                     | Move cursor to previous empty line, or beginning of document                              |
+| Alt+}                     | Move cursor to next empty line, or end of document                                        |
 | PageUp                    | Move cursor up one page                                                                   |
 | PageDown                  | Move cursor down one page                                                                 |
 | CtrlHome or CtrlUpArrow   | Move cursor to start of document                                                          |
diff --git a/runtime/help/keybindings.md b/runtime/help/keybindings.md
index ddc81de9..652fcc69 100644
--- a/runtime/help/keybindings.md
+++ b/runtime/help/keybindings.md
@@ -113,6 +113,8 @@ HalfPageUp
 HalfPageDown
 StartOfLine
 EndOfLine
+ParagraphPrevious
+ParagraphNext
 ToggleHelp
 ToggleRuler
 JumpLine
@@ -315,6 +317,8 @@ MouseWheelRight
     "CtrlDown":       "CursorEnd",
     "CtrlShiftUp":    "SelectToStart",
     "CtrlShiftDown":  "SelectToEnd",
+    "Alt-{":          "ParagraphPrevious",
+    "Alt-}":          "ParagraphNext",
     "Enter":          "InsertNewline",
     "CtrlH":          "Backspace",
     "Backspace":      "Backspace",