Gutter message support

cmd/micro/buffer/buffer.go

@@ -104,6 +104,8 @@ type Buffer struct {
 
 	// Type of the buffer (e.g. help, raw, scratch etc..)
 	Type BufType
+
+	Messages []*Message
 }
 
 // NewBufferFromFile opens a new buffer using the given path

cmd/micro/buffer/message.go

@@ -0,0 +1,80 @@
+package buffer
+
+import (
+	"log"
+
+	"github.com/zyedidia/micro/cmd/micro/config"
+	"github.com/zyedidia/tcell"
+)
+
+type MsgType int
+
+const (
+	MTInfo = iota
+	MTWarning
+	MTError
+)
+
+type Message struct {
+	Msg        string
+	Start, End Loc
+	Kind       MsgType
+	Owner      int
+}
+
+func NewMessage(owner int, msg string, start, end Loc, kind MsgType) *Message {
+	return &Message{
+		Msg:   msg,
+		Start: start,
+		End:   end,
+		Kind:  kind,
+		Owner: owner,
+	}
+}
+
+func NewMessageAtLine(owner int, msg string, line int, kind MsgType) *Message {
+	start := Loc{-1, line}
+	end := start
+	return NewMessage(owner, msg, start, end, kind)
+}
+
+func (m *Message) Style() tcell.Style {
+	switch m.Kind {
+	case MTInfo:
+		if style, ok := config.Colorscheme["gutter-info"]; ok {
+			return style
+		}
+	case MTWarning:
+		if style, ok := config.Colorscheme["gutter-warning"]; ok {
+			return style
+		}
+	case MTError:
+		if style, ok := config.Colorscheme["gutter-error"]; ok {
+			log.Println("Return error")
+			return style
+		}
+	}
+	return config.DefStyle
+}
+
+func (b *Buffer) AddMessage(m *Message) {
+	b.Messages = append(b.Messages, m)
+}
+
+func (b *Buffer) removeMsg(i int) {
+	copy(b.Messages[i:], b.Messages[i+1:])
+	b.Messages[len(b.Messages)-1] = nil
+	b.Messages = b.Messages[:len(b.Messages)-1]
+}
+
+func (b *Buffer) ClearMessages(owner int) {
+	for i := len(b.Messages) - 1; i >= 0; i-- {
+		if b.Messages[i].Owner == owner {
+			b.removeMsg(i)
+		}
+	}
+}
+
+func (b *Buffer) ClearAllMessages() {
+	b.Messages = make([]*Message, 0)
+}