Add search functionality

Fixes #21

README.md

@@ -59,6 +59,16 @@ Getting started
                 "C-8":         "backspace",
                 "<delete>":    "delete",
                 "<space>":     "space"
+            },
+            "search": {
+                "<left>":      "cursor-left",
+                "<right>":     "cursor-right",
+                "<escape>":    "clear-input",
+                "<enter>":     "clear-input",
+                "<backspace>": "backspace",
+                "C-8":         "backspace",
+                "<delete>":    "delete",
+                "<space>":     "space"
             }
         }
     }
@@ -79,6 +89,7 @@ Default Key Mapping
 | mode    | key       | action                     |
 |---------|-----------|----------------------------|
 | command | `i`       | insert mode                |
+| command | `/`       | search mode                |
 | command | `k`       | move channel cursor up     |
 | command | `j`       | move channel cursor down   |
 | command | `g`       | move channel cursor top    |
@@ -95,3 +106,5 @@ Default Key Mapping
 | insert  | `right`   | move input cursor right    |
 | insert  | `enter`   | send message               |
 | insert  | `esc`     | command mode               |
+| search  | `esc`     | command mode               |
+| search  | `enter`   | command mode               |

components/channels.go

@@ -195,6 +195,7 @@ func (c *Channels) MoveCursorBottom() {
 
 // ScrollUp enables us to scroll through the channel list when it overflows
 func (c *Channels) ScrollUp() {
+	// Is cursor at the top of the channel view?
 	if c.CursorPosition == c.List.InnerBounds().Min.Y {
 		if c.Offset > 0 {
 			c.Offset--
@@ -206,6 +207,7 @@ func (c *Channels) ScrollUp() {
 
 // ScrollDown enables us to scroll through the channel list when it overflows
 func (c *Channels) ScrollDown() {
+	// Is the cursor at the bottom of the channel view?
 	if c.CursorPosition == c.List.InnerBounds().Max.Y-1 {
 		if c.Offset < len(c.List.Items)-1 {
 			c.Offset++
@@ -215,6 +217,45 @@ func (c *Channels) ScrollDown() {
 	}
 }
 
+// Search will search through the channels to find a channel,
+// when a match has been found the selected channel will then
+// be the channel that has been found
+func (c *Channels) Search(term string) {
+	for i, item := range c.List.Items {
+		if strings.Contains(item, term) {
+
+			// The new position
+			newPos := i
+
+			// Is the new position in range of the current view?
+			minRange := c.Offset
+			maxRange := c.Offset + c.List.InnerBounds().Max.Y - 1
+
+			if newPos < minRange {
+				// newPos is above, we need to scroll up.
+				c.SetSelectedChannel(i)
+
+				// How much do we need to scroll to get it into range?
+				c.Offset = c.Offset - (minRange - newPos)
+			} else if newPos > maxRange {
+				// newPos is below, we need to scroll down
+				c.SetSelectedChannel(i)
+
+				// How much do we need to scroll to get it into range?
+				c.Offset = c.Offset + (newPos - maxRange) + 1
+			} else {
+				// newPos is inside range
+				c.SetSelectedChannel(i)
+			}
+
+			// Set cursor to correct position
+			c.CursorPosition = (newPos - minRange) + 1
+
+			break
+		}
+	}
+}
+
 // SetNotification will be called when a new message arrives and will
 // render an notification icon in front of the channel name
 func (c *Channels) SetNotification(svc *service.SlackService, channelID string) {

config/config.go

@@ -28,6 +28,7 @@ func NewConfig(filepath string) (*Config, error) {
 		KeyMap: map[string]keyMapping{
 			"command": {
 				"i":          "mode-insert",
+				"/":          "mode-search",
 				"k":          "channel-up",
 				"j":          "channel-down",
 				"g":          "channel-top",
@@ -51,6 +52,16 @@ func NewConfig(filepath string) (*Config, error) {
 				"<delete>":    "delete",
 				"<space>":     "space",
 			},
+			"search": {
+				"<left>":      "cursor-left",
+				"<right>":     "cursor-right",
+				"<escape>":    "clear-input",
+				"<enter>":     "clear-input",
+				"<backspace>": "backspace",
+				"C-8":         "backspace",
+				"<delete>":    "delete",
+				"<space>":     "space",
+			},
 		},
 	}
 

context/context.go

@@ -14,6 +14,7 @@ import (
 const (
 	CommandMode = "command"
 	InsertMode  = "insert"
+	SearchMode  = "search"
 )
 
 type AppContext struct {

handlers/event.go

@@ -28,6 +28,8 @@ var actionMap = map[string]func(*context.AppContext){
 	"quit":           actionQuit,
 	"mode-insert":    actionInsertMode,
 	"mode-command":   actionCommandMode,
+	"mode-search":    actionSearchMode,
+	"clear-input":    actionClearInput,
 	"channel-up":     actionMoveCursorUpChannels,
 	"channel-down":   actionMoveCursorDownChannels,
 	"channel-top":    actionMoveCursorTopChannels,
@@ -67,6 +69,8 @@ func anyKeyHandler(ctx *context.AppContext) {
 			} else {
 				if ctx.Mode == context.InsertMode && ev.Ch != 0 {
 					actionInput(ctx.View, ev.Ch)
+				} else if ctx.Mode == context.SearchMode && ev.Ch != 0 {
+					actionSearch(ctx, ev.Ch)
 				}
 			}
 		}
@@ -133,6 +137,15 @@ func actionInput(view *views.View, key rune) {
 	termui.Render(view.Input)
 }
 
+func actionClearInput(ctx *context.AppContext) {
+	// Clear input
+	ctx.View.Input.Clear()
+	ctx.View.Refresh()
+
+	// Set command mode
+	actionCommandMode(ctx)
+}
+
 func actionSpace(ctx *context.AppContext) {
 	actionInput(ctx.View, ' ')
 }
@@ -174,6 +187,23 @@ func actionSend(ctx *context.AppContext) {
 	}
 }
 
+func actionSearch(ctx *context.AppContext, key rune) {
+	go func() {
+		if timer != nil {
+			timer.Stop()
+		}
+
+		actionInput(ctx.View, key)
+
+		timer = time.NewTimer(time.Second / 4)
+		<-timer.C
+
+		term := ctx.View.Input.GetText()
+		ctx.View.Channels.Search(term)
+		actionChangeChannel(ctx)
+	}()
+}
+
 // actionQuit will exit the program by using os.Exit, this is
 // done because we are using a custom termui EvtStream. Which
 // we won't be able to call termui.StopLoop() on. See main.go
@@ -194,6 +224,12 @@ func actionCommandMode(ctx *context.AppContext) {
 	termui.Render(ctx.View.Mode)
 }
 
+func actionSearchMode(ctx *context.AppContext) {
+	ctx.Mode = context.SearchMode
+	ctx.View.Mode.Par.Text = "SEARCH"
+	termui.Render(ctx.View.Mode)
+}
+
 func actionGetMessages(ctx *context.AppContext) {
 	ctx.View.Chat.GetMessages(
 		ctx.Service,