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model.go
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model.go
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package tui
import (
"bufio"
"context"
"fmt"
"io"
"strings"
"time"
"github.com/benchkram/bob/pkg/boblog"
"github.com/benchkram/bob/pkg/ctl"
"github.com/benchkram/bob/pkg/usererror"
"github.com/benchkram/errz"
"github.com/charmbracelet/bubbles/help"
"github.com/charmbracelet/bubbles/key"
"github.com/charmbracelet/bubbles/viewport"
tea "github.com/charmbracelet/bubbletea"
"github.com/charmbracelet/lipgloss"
"github.com/logrusorgru/aurora"
"github.com/pkg/errors"
"github.com/xlab/treeprint"
)
func init() {
treeprint.EdgeTypeLink = "│"
treeprint.EdgeTypeMid = "├"
treeprint.EdgeTypeEnd = "└"
treeprint.IndentSize = 2
}
type keyMap struct {
NextTab key.Binding
FollowOutput key.Binding
Restart key.Binding
Quit key.Binding
SelectScroll key.Binding
Up key.Binding
Down key.Binding
}
func (k keyMap) ShortHelp() []key.Binding {
return []key.Binding{k.Restart, k.NextTab, k.FollowOutput, k.SelectScroll, k.Quit}
}
func (k keyMap) FullHelp() [][]key.Binding {
return [][]key.Binding{
{k.Restart, k.NextTab, k.FollowOutput, k.SelectScroll, k.Quit},
}
}
var keys = keyMap{
NextTab: key.NewBinding(
key.WithKeys("tab"),
key.WithHelp("[TAB]", "next tab"),
),
FollowOutput: key.NewBinding(
key.WithKeys("esc"),
key.WithHelp("[ESC]", "follow output"),
),
Restart: key.NewBinding(
key.WithKeys("ctrl+r"),
key.WithHelp("[^R]", "restart task"),
),
Quit: key.NewBinding(
key.WithKeys("ctrl+c"),
key.WithHelp("[^C]", "quit"),
),
SelectScroll: key.NewBinding(
key.WithKeys("ctrl+s"),
key.WithHelp("[^S]", "select text"),
),
Up: key.NewBinding(
key.WithKeys("up", "pgup", "wheel up"),
),
Down: key.NewBinding(
key.WithKeys("down", "pgdown", "wheel down"),
),
}
type model struct {
keys keyMap
scroll bool
events chan interface{}
programEvents chan interface{}
cmder ctl.Commander
tabs []*tab
currentTab int
starting bool
restarting bool
stopping bool
width int
height int
content viewport.Model
header viewport.Model
footer help.Model
follow bool
scrollOffset int
ready bool
error error
}
type tab struct {
name string
output *LineBuffer
}
func newModel(cmder ctl.Commander, evts, programEvts chan interface{}, buffer *LineBuffer) *model {
tabs := []*tab{}
tabs = append(tabs, &tab{
name: "status",
output: buffer,
})
for i, cmd := range cmder.Subcommands() {
buf, err := multiScanner(i+1, evts, cmd.Stdout(), cmd.Stderr())
if err != nil {
errz.Log(err)
}
tabs = append(tabs, &tab{
name: cmd.Name(),
output: buf,
})
}
return &model{
cmder: cmder,
currentTab: 0,
scroll: true,
tabs: tabs,
events: evts,
programEvents: programEvts,
keys: keys,
follow: true,
footer: help.Model{
ShowAll: false,
ShortSeparator: " · ",
FullSeparator: "",
Ellipsis: "...",
Styles: help.Styles{
ShortKey: lipgloss.NewStyle().Foreground(lipgloss.Color("#bbb")),
ShortDesc: lipgloss.NewStyle().Foreground(lipgloss.Color("#999")),
},
},
}
}
func multiScanner(tabId int, events chan interface{}, rs ...io.Reader) (*LineBuffer, error) {
buf := NewLineBuffer(120) // use some default width
for _, r := range rs {
s := bufio.NewScanner(r)
s.Split(bufio.ScanLines)
go func() {
i := 0
for s.Scan() {
err := s.Err()
if err != nil {
return
}
_, _ = buf.Write(s.Bytes())
i++
events <- Update{tab: tabId}
}
}()
}
return buf, nil
}
func (m *model) Init() tea.Cmd {
return tea.Batch(
start(m),
nextEvent(m.events),
tick(),
)
}
func (m *model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
var cmds []tea.Cmd
updateHeader := false
switch msg := msg.(type) {
case tea.KeyMsg:
// for _, r := range msg.Runes {
// print(fmt.Sprintf("%s\n", strconv.QuoteRuneToASCII(r)))
// }
switch {
// case string(msg.Runes[0]) == "[":
// errz.Log(fmt.Errorf("%#v", msg.Runes[0]))
case key.Matches(msg, m.keys.NextTab):
m.currentTab = (m.currentTab + 1) % len(m.tabs)
m.setOffset(m.tabs[m.currentTab].output.Len())
m.updateContent()
updateHeader = true
case key.Matches(msg, m.keys.FollowOutput):
m.follow = true
m.setOffset(m.tabs[m.currentTab].output.Len())
m.updateContent()
case key.Matches(msg, m.keys.Restart):
status := fmt.Sprintf("\n%-*s\n", 10, "restarting")
status = aurora.Colorize(status, aurora.CyanFg|aurora.BoldFm).String()
for i, t := range m.tabs {
_, err := t.output.Write([]byte(status))
errz.Log(err)
m.events <- Update{tab: i}
}
m.follow = true
m.setOffset(m.tabs[m.currentTab].output.Len())
m.updateContent()
updateHeader = true
cmds = append(cmds, restart(m))
case key.Matches(msg, m.keys.Quit):
status := fmt.Sprintf("\n%-*s\n", 10, "stopping")
status = aurora.Colorize(status, aurora.RedFg|aurora.BoldFm).String()
for i, t := range m.tabs {
_, err := t.output.Write([]byte(status))
errz.Log(err)
m.events <- Update{tab: i}
}
m.follow = true
m.setOffset(m.tabs[m.currentTab].output.Len())
m.updateContent()
updateHeader = true
cmds = append(cmds, stop(m))
case key.Matches(msg, m.keys.SelectScroll):
scroll := !m.scroll
if scroll {
m.programEvents <- EnableScroll{}
m.keys.SelectScroll.SetHelp("[^S]", "select text")
} else {
m.programEvents <- DisableScroll{}
m.keys.SelectScroll.SetHelp("[^S]", "scroll text")
}
m.scroll = scroll
case key.Matches(msg, m.keys.Up):
m.follow = false
m.updateOffset(-1)
m.updateContent()
case key.Matches(msg, m.keys.Down):
m.updateOffset(1)
m.updateContent()
}
case tea.MouseMsg:
switch {
case msg.Type == tea.MouseWheelUp:
m.follow = false
m.updateOffset(-1)
m.updateContent()
case msg.Type == tea.MouseWheelDown:
m.updateOffset(1)
m.updateContent()
}
case time.Time:
cmds = append(cmds, tick())
case tea.WindowSizeMsg:
if !m.ready {
// initialize viewports
m.header.SetContent("\n")
m.updateOffset(0)
if m.follow {
m.updateOffset(m.tabs[m.currentTab].output.Len())
}
m.updateContent()
updateHeader = true
m.ready = true
}
m.width = msg.Width
m.height = msg.Height
m.header.Width = m.width
m.header.Height = 2
m.content.Width = m.width
m.content.Height = m.height - 4
m.footer.Width = m.width
for _, t := range m.tabs {
// update all lines in the buffers so that soft wrapping works nicely
t.output.SetWidth(m.width)
}
if m.follow {
m.updateOffset(m.tabs[m.currentTab].output.Len())
}
// re-render content after resize
m.updateContent()
case Quit:
cmds = append(cmds, tea.Quit)
case Started:
m.starting = false
updateHeader = true
case Restarted:
m.restarting = false
updateHeader = true
case Update:
// ignore updates for tabs that are not currently in view
if msg.tab == m.currentTab {
// scroll to end for the current tab if following output
if m.follow {
m.updateOffset(m.tabs[m.currentTab].output.Len())
}
// always re-render content if a new message is received
m.updateContent()
}
// listen for the next update event
cmds = append(cmds, nextEvent(m.events))
}
// only re-render the header if necessary
if updateHeader {
// calculate header status
var status string
if m.starting {
status = fmt.Sprintf("%-*s", 10, "starting")
status = aurora.Colorize(status, aurora.BlueFg|aurora.BoldFm).String()
} else if m.restarting {
status = fmt.Sprintf("%-*s", 10, "restarting")
status = aurora.Colorize(status, aurora.CyanFg|aurora.BoldFm).String()
} else if m.stopping {
status = fmt.Sprintf("%-*s", 10, "stopping")
status = aurora.Colorize(status, aurora.RedFg|aurora.BoldFm).String()
} else {
status = fmt.Sprintf("%-*s", 10, "running")
status = aurora.Colorize(status, aurora.GreenFg|aurora.BoldFm).String()
}
// create tabs
tabs := make([]string, len(m.tabs))
for i, tab := range m.tabs {
var name string
if i == m.currentTab {
name = aurora.Colorize(tab.name, aurora.BoldFm).String()
} else {
name = aurora.Colorize(tab.name, aurora.WhiteFg).String()
}
tabs[i] = fmt.Sprintf("[%s]", name)
}
tabsView := strings.Join(tabs, " ")
m.header.SetContent(fmt.Sprintf("%s %s", status, tabsView))
m.header, _ = m.header.Update(msg)
}
var updateCmd tea.Cmd
m.content, updateCmd = m.content.Update(msg)
cmds = append(cmds, updateCmd)
// if m.error != nil {
// //cmds = append(cmds, stop(m))
// }
return m, tea.Batch(cmds...)
}
func (m *model) updateContent() {
buf := m.tabs[m.currentTab].output
viewportHeight := m.height - 4
bufLen := buf.Len()
offset := m.scrollOffset
maxOffset := bufLen
from := min(offset, maxOffset)
to := max(offset+viewportHeight, 0)
lines := buf.Lines(from, to)
m.content.SetContent(strings.Join(lines, "\n"))
}
func max(a, b int) int {
if a > b {
return a
}
return b
}
func min(a, b int) int {
if a < b {
return a
}
return b
}
func (m *model) View() string {
var view strings.Builder
view.WriteString(m.header.View())
view.WriteString("\n")
view.WriteString(m.content.View())
view.WriteString("\n\n")
view.WriteString(m.footer.View(m.keys))
return view.String()
}
func (m *model) updateOffset(delta int) {
m.setOffset(m.scrollOffset + delta*3)
}
func (m *model) setOffset(offset int) {
viewportHeight := m.height - 4
buf := m.tabs[m.currentTab].output
bufLen := buf.Len()
maxOffset := bufLen
if maxOffset > viewportHeight {
maxOffset -= viewportHeight
if offset == bufLen-viewportHeight {
m.follow = true
}
} else {
maxOffset = 0 // do not allow scrolling if there is nothing else to see
m.follow = true
}
offset = max(min(offset, maxOffset), 0)
m.scrollOffset = offset
}
func tick() tea.Cmd {
return tea.Tick(
1000*time.Millisecond, func(t time.Time) tea.Msg {
return t
},
)
}
func start(m *model) tea.Cmd {
m.starting = true
return func() tea.Msg {
err := m.cmder.Start()
if errors.As(err, &usererror.Err) {
boblog.Log.UserError(err)
} else if err != nil && err != context.Canceled {
boblog.Log.Error(err, "Error during commander execution")
}
m.error = err
return Started{}
}
}
func restart(m *model) tea.Cmd {
m.restarting = true
return func() tea.Msg {
err := m.cmder.Restart()
errz.Log(err)
return Restarted{}
}
}
func stop(m *model) tea.Cmd {
m.stopping = true
m.programEvents <- DisableScroll{}
return func() tea.Msg {
err := m.cmder.Stop()
errz.Log(err)
return Quit{}
}
}
func nextEvent(evts chan interface{}) tea.Cmd {
return func() tea.Msg {
return <-evts
}
}