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channels.go
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channels.go
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package components
import (
"fmt"
"strings"
"github.com/gizak/termui"
"github.com/erroneousboat/slack-term/service"
)
// Channels is the definition of a Channels component
type Channels struct {
List *termui.List
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
func CreateChannels(svc *service.SlackService, inputHeight int) *Channels {
channels := &Channels{
List: termui.NewList(),
}
channels.List.BorderLabel = "Channels"
channels.List.Height = termui.TermHeight() - inputHeight
channels.SelectedChannel = 0
channels.Offset = 0
channels.CursorPosition = channels.List.InnerBounds().Min.Y
channels.GetChannels(svc)
return channels
}
// Buffer implements interface termui.Bufferer
func (c *Channels) Buffer() termui.Buffer {
buf := c.List.Buffer()
for i, item := range c.List.Items[c.Offset:] {
y := c.List.InnerBounds().Min.Y + i
if y > c.List.InnerBounds().Max.Y-1 {
break
}
var cells []termui.Cell
if y == c.CursorPosition {
cells = termui.DefaultTxBuilder.Build(
item, c.List.ItemBgColor, c.List.ItemFgColor)
} else {
cells = termui.DefaultTxBuilder.Build(
item, c.List.ItemFgColor, c.List.ItemBgColor)
}
cells = termui.DTrimTxCls(cells, c.List.InnerWidth())
x := 0
for _, cell := range cells {
width := cell.Width()
buf.Set(c.List.InnerBounds().Min.X+x, y, cell)
x += width
}
// When not at the end of the pane fill it up empty characters
for x < c.List.InnerBounds().Max.X-1 {
if y == c.CursorPosition {
buf.Set(x+1, y,
termui.Cell{
Ch: ' ',
Fg: c.List.ItemBgColor,
Bg: c.List.ItemFgColor,
},
)
} else {
buf.Set(
x+1, y,
termui.Cell{
Ch: ' ',
Fg: c.List.ItemFgColor,
Bg: c.List.ItemBgColor,
},
)
}
x++
}
}
return buf
}
// GetHeight implements interface termui.GridBufferer
func (c *Channels) GetHeight() int {
return c.List.Block.GetHeight()
}
// SetWidth implements interface termui.GridBufferer
func (c *Channels) SetWidth(w int) {
c.List.SetWidth(w)
}
// SetX implements interface termui.GridBufferer
func (c *Channels) SetX(x int) {
c.List.SetX(x)
}
// SetY implements interface termui.GridBufferer
func (c *Channels) SetY(y int) {
c.List.SetY(y)
}
// GetChannels will get all available channels from the SlackService
func (c *Channels) GetChannels(svc *service.SlackService) {
for _, slackChan := range svc.GetChannels() {
c.List.Items = append(c.List.Items, fmt.Sprintf(" %s", slackChan.Name))
}
}
// SetSelectedChannel sets the SelectedChannel given the index
func (c *Channels) SetSelectedChannel(index int) {
c.SelectedChannel = index
}
// MoveCursorUp will decrease the SelectedChannel by 1
func (c *Channels) MoveCursorUp() {
if c.SelectedChannel > 0 {
c.SetSelectedChannel(c.SelectedChannel - 1)
c.ScrollUp()
c.ClearNewMessageIndicator()
}
}
// MoveCursorDown will increase the SelectedChannel by 1
func (c *Channels) MoveCursorDown() {
if c.SelectedChannel < len(c.List.Items)-1 {
c.SetSelectedChannel(c.SelectedChannel + 1)
c.ScrollDown()
c.ClearNewMessageIndicator()
}
}
// 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 {
if c.Offset > 0 {
c.Offset--
}
} else {
c.CursorPosition--
}
}
// ScrollDown enables us to scroll through the channel list when it overflows
func (c *Channels) ScrollDown() {
if c.CursorPosition == c.List.InnerBounds().Max.Y-1 {
if c.Offset < len(c.List.Items)-1 {
c.Offset++
}
} else {
c.CursorPosition++
}
}
// NewMessage will be called when a new message arrives and will
// render an asterisk in front of the channel name
func (c *Channels) NewMessage(svc *service.SlackService, channelID string) {
var index int
// Get the correct Channel from svc.Channels
for i, channel := range svc.Channels {
if channelID == channel.ID {
index = i
break
}
}
if !strings.Contains(c.List.Items[index], "*") {
// The order of svc.Channels relates to the order of
// List.Items, index will be the index of the channel
c.List.Items[index] = fmt.Sprintf("* %s", strings.TrimSpace(c.List.Items[index]))
}
// Play terminal bell sound
fmt.Print("\a")
}
// ClearNewMessageIndicator will remove the asterisk in front of a channel that
// received a new message. This will happen as one will move up or down the
// cursor for Channels
func (c *Channels) ClearNewMessageIndicator() {
channelName := strings.Split(c.List.Items[c.SelectedChannel], "* ")
if len(channelName) > 1 {
c.List.Items[c.SelectedChannel] = fmt.Sprintf(" %s", channelName[1])
} else {
c.List.Items[c.SelectedChannel] = channelName[0]
}
}
func (c *Channels) SetReadMark(svc *service.SlackService) {
svc.SetChannelReadMark(svc.SlackChannels[c.SelectedChannel])
}