Add channel scroll top and bottom

Fixes #20

README.md

@@ -43,10 +43,12 @@ Usage
 -----
 
 | mode   | key       | action                     |
-|--------|-----------|--------------------------|
+|--------|-----------|----------------------------|
 | normal | `i`       | insert mode                |
 | normal | `k`       | move channel cursor up     |
 | normal | `j`       | move channel cursor down   |
+| normal | `gg`      | move channel cursor top    |
+| normal | `G`       | move channel cursor bottom |
 | normal | `pg-up`   | scroll chat pane up        |
 | normal | `ctrl-b`  | scroll chat pane up        |
 | normal | `ctrl-u`  | scroll chat pane up        |

src/components/channels.go

@@ -12,9 +12,9 @@ import (
 // Channels is the definition of a Channels component
 type Channels struct {
 	List            *termui.List
-	SelectedChannel int
-	Offset          int
-	CursorPosition  int
+	SelectedChannel int // index of which channel is selected from the List
+	Offset          int // from what offset are channels rendered
+	CursorPosition  int // the y position of the 'cursor'
 }
 
 // CreateChannels is the constructor for the Channels component
@@ -142,6 +142,28 @@ func (c *Channels) MoveCursorDown() {
 	}
 }
 
+// MoveCursorTop will move the cursor to the top of the channels
+func (c *Channels) MoveCursorTop() {
+	c.SetSelectedChannel(0)
+	c.CursorPosition = c.List.InnerBounds().Min.Y
+	c.Offset = 0
+}
+
+// MoveCursorBottom will move the cursor to the bottom of the channels
+func (c *Channels) MoveCursorBottom() {
+	c.SetSelectedChannel(len(c.List.Items) - 1)
+
+	offset := len(c.List.Items) - (c.List.InnerBounds().Max.Y - 1)
+
+	if offset < 0 {
+		c.Offset = 0
+		c.CursorPosition = c.SelectedChannel + 1
+	} else {
+		c.Offset = offset
+		c.CursorPosition = c.List.InnerBounds().Max.Y - 1
+	}
+}
+
 // ScrollUp enables us to scroll through the channel list when it overflows
 func (c *Channels) ScrollUp() {
 	if c.CursorPosition == c.List.InnerBounds().Min.Y {

src/handlers/event.go

@@ -43,6 +43,10 @@ func anyKeyHandler(ctx *context.AppContext) {
 							actionMoveCursorDownChannels(ctx)
 						case 'k':
 							actionMoveCursorUpChannels(ctx)
+						case 'g':
+							actionMoveCursorTopChannels(ctx)
+						case 'G':
+							actionMoveCursorBottomChannels(ctx)
 						case 'i':
 							actionInsertMode(ctx)
 						}
@@ -208,6 +212,16 @@ func actionMoveCursorDownChannels(ctx *context.AppContext) {
 	actionChangeChannel(ctx)
 }
 
+func actionMoveCursorTopChannels(ctx *context.AppContext) {
+	ctx.View.Channels.MoveCursorTop()
+	actionChangeChannel(ctx)
+}
+
+func actionMoveCursorBottomChannels(ctx *context.AppContext) {
+	ctx.View.Channels.MoveCursorBottom()
+	actionChangeChannel(ctx)
+}
+
 func actionChangeChannel(ctx *context.AppContext) {
 	// Clear messages from Chat pane
 	ctx.View.Chat.ClearMessages()