term: replace go-libvterm with tcell-term
Replace go-libvterm package with tcell-term. go-libvterm provides the embedded terminal for aerc. It uses a statically linked C library, requiring CGO. tcell-term is written in pure go and is written to be portable with tcell applications by implementing the tcell Widget interface. This allows the terminal to take a view (which aerc already supplies) and draw directly to it, as well as issue tcell Events to a Watcher. Enable setting cursor shapes in embedded terminals. Signed-off-by: Tim Culverhouse <tim@timculverhouse.com> Signed-off-by: Robin Jarry <robin@jarry.cc>
This commit is contained in:
Tim Culverhouse
Robin Jarry
parent
17c4781911
commit
518f3e962c
5 changed files with 84 additions and 383 deletions
widgets
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@ -758,6 +758,10 @@ func (pv *PartViewer) copyFilterOutToPager() {
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logging.Warnf("failed to wait for the filter process: %v", err)
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}
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pv.pagerin.Close()
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// If the pager command doesn't keep the terminal running, we
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// risk not drawing the screen until user input unless we
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// invalidate after writing
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pv.Invalidate()
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}()
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}
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@ -1,113 +1,27 @@
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package widgets
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import (
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"os"
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"os/exec"
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"sync"
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"syscall"
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"git.sr.ht/~rjarry/aerc/lib/ui"
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"git.sr.ht/~rjarry/aerc/logging"
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tcellterm "git.sr.ht/~rockorager/tcell-term"
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"github.com/creack/pty"
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vterm "github.com/ddevault/go-libvterm"
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"github.com/gdamore/tcell/v2"
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"github.com/gdamore/tcell/v2/views"
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)
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type vtermKey struct {
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Key vterm.Key
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Rune rune
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Mod vterm.Modifier
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}
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var keyMap map[tcell.Key]vtermKey
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func directKey(key vterm.Key) vtermKey {
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return vtermKey{key, 0, vterm.ModNone}
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}
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func runeMod(r rune, mod vterm.Modifier) vtermKey {
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return vtermKey{vterm.KeyNone, r, mod}
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}
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func keyMod(key vterm.Key, mod vterm.Modifier) vtermKey {
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return vtermKey{key, 0, mod}
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}
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func init() {
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keyMap = make(map[tcell.Key]vtermKey)
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keyMap[tcell.KeyCtrlSpace] = runeMod(' ', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlA] = runeMod('a', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlB] = runeMod('b', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlC] = runeMod('c', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlD] = runeMod('d', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlE] = runeMod('e', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlF] = runeMod('f', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlG] = runeMod('g', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlH] = runeMod('h', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlI] = runeMod('i', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlJ] = runeMod('j', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlK] = runeMod('k', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlL] = runeMod('l', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlM] = runeMod('m', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlN] = runeMod('n', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlO] = runeMod('o', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlP] = runeMod('p', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlQ] = runeMod('q', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlR] = runeMod('r', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlS] = runeMod('s', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlT] = runeMod('t', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlU] = runeMod('u', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlV] = runeMod('v', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlW] = runeMod('w', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlX] = runeMod('x', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlY] = runeMod('y', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlZ] = runeMod('z', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlBackslash] = runeMod('\\', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlCarat] = runeMod('^', vterm.ModCtrl)
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keyMap[tcell.KeyCtrlUnderscore] = runeMod('_', vterm.ModCtrl)
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keyMap[tcell.KeyEnter] = directKey(vterm.KeyEnter)
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keyMap[tcell.KeyTab] = directKey(vterm.KeyTab)
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keyMap[tcell.KeyBacktab] = keyMod(vterm.KeyTab, vterm.ModShift)
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keyMap[tcell.KeyBackspace] = directKey(vterm.KeyBackspace)
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keyMap[tcell.KeyEscape] = directKey(vterm.KeyEscape)
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keyMap[tcell.KeyUp] = directKey(vterm.KeyUp)
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keyMap[tcell.KeyDown] = directKey(vterm.KeyDown)
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keyMap[tcell.KeyLeft] = directKey(vterm.KeyLeft)
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keyMap[tcell.KeyRight] = directKey(vterm.KeyRight)
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keyMap[tcell.KeyInsert] = directKey(vterm.KeyIns)
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keyMap[tcell.KeyDelete] = directKey(vterm.KeyDel)
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keyMap[tcell.KeyHome] = directKey(vterm.KeyHome)
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keyMap[tcell.KeyEnd] = directKey(vterm.KeyEnd)
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keyMap[tcell.KeyPgUp] = directKey(vterm.KeyPageUp)
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keyMap[tcell.KeyPgDn] = directKey(vterm.KeyPageDown)
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for i := 0; i < 64; i++ {
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keyMap[tcell.Key(int(tcell.KeyF1)+i)] = directKey(vterm.Key(int(vterm.KeyFunction0) + i + 1))
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}
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keyMap[tcell.KeyTAB] = directKey(vterm.KeyTab)
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keyMap[tcell.KeyESC] = directKey(vterm.KeyEscape)
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keyMap[tcell.KeyDEL] = directKey(vterm.KeyBackspace)
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}
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type Terminal struct {
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ui.Invalidatable
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closed bool
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cmd *exec.Cmd
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ctx *ui.Context
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cursorPos vterm.Pos
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cursorShown bool
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destroyed bool
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err error
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focus bool
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pty *os.File
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start chan interface{}
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vterm *vterm.VTerm
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damage []vterm.Rect // protected by damageMutex
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damageMutex sync.Mutex
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writeMutex sync.Mutex
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readMutex sync.Mutex
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closeMutex sync.Mutex
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vterm *tcellterm.Terminal
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running bool
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OnClose func(err error)
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OnEvent func(event tcell.Event) bool
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@ -120,115 +34,56 @@ func NewTerminal(cmd *exec.Cmd) (*Terminal, error) {
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cursorShown: true,
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}
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term.cmd = cmd
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term.vterm = vterm.New(24, 80)
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term.vterm.SetUTF8(true)
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term.start = make(chan interface{})
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screen := term.vterm.ObtainScreen()
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go func() {
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defer logging.PanicHandler()
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<-term.start
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buf := make([]byte, 4096)
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for {
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n, err := term.pty.Read(buf)
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if err != nil || term.closed {
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// These are generally benine errors when the process exits
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term.Close(nil)
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return
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}
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term.writeMutex.Lock()
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_, err = term.vterm.Write(buf[:n])
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term.writeMutex.Unlock()
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if err != nil {
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term.Close(err)
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return
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}
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screen.Flush()
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term.flushTerminal()
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term.invalidate()
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}
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}()
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screen.OnDamage = term.onDamage
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screen.OnMoveCursor = term.onMoveCursor
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screen.OnSetTermProp = term.onSetTermProp
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screen.EnableAltScreen(true)
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screen.Reset(true)
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term.vterm = tcellterm.New()
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return term, nil
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}
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func (term *Terminal) flushTerminal() {
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buf := make([]byte, 4096)
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for {
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term.readMutex.Lock()
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n, err := term.vterm.Read(buf)
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term.readMutex.Unlock()
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if err != nil {
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term.Close(err)
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return
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}
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if n == 0 {
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break
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}
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_, err = term.pty.Write(buf[:n])
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if err != nil {
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term.Close(err)
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return
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}
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}
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}
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func (term *Terminal) Close(err error) {
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term.closeMutex.Lock()
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defer term.closeMutex.Unlock()
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if term.closed {
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return
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}
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term.err = err
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if term.pty != nil {
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term.pty.Close()
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term.pty = nil
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}
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// Stop receiving events
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term.vterm.Unwatch(term)
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if term.cmd != nil && term.cmd.Process != nil {
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err := term.cmd.Process.Kill()
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if err != nil {
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logging.Warnf("failed to kill process: %v", err)
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}
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err = term.cmd.Wait()
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// Race condition here, check if cmd exists. If process exits
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// fast, this could by nil and panic
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if term.cmd != nil {
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err = term.cmd.Wait()
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}
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if err != nil {
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logging.Warnf("failed for wait for process to terminate: %v", err)
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}
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term.cmd = nil
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}
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if term.vterm != nil {
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term.vterm.Close()
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}
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if !term.closed && term.OnClose != nil {
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term.OnClose(err)
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}
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term.closed = true
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term.ctx.HideCursor()
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term.closed = true
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}
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func (term *Terminal) Destroy() {
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if term.destroyed {
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return
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}
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if term.vterm != nil {
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term.vterm.Close()
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term.vterm = nil
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}
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if term.ctx != nil {
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term.ctx.HideCursor()
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}
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// If we destroy, we don't want to call the OnClose callback
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term.OnClose = nil
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term.Close(nil)
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term.vterm = nil
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term.destroyed = true
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}
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func (term *Terminal) Invalidate() {
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if term.vterm != nil {
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width, height := term.vterm.Size()
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rect := vterm.NewRect(0, width, 0, height)
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term.damageMutex.Lock()
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term.damage = append(term.damage, *rect)
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term.damageMutex.Unlock()
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}
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term.invalidate()
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}
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@ -240,104 +95,44 @@ func (term *Terminal) Draw(ctx *ui.Context) {
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if term.destroyed {
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return
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}
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term.ctx = ctx // gross
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if !term.closed {
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winsize := pty.Winsize{
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Cols: uint16(ctx.Width()),
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Rows: uint16(ctx.Height()),
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}
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if winsize.Cols == 0 || winsize.Rows == 0 || term.cmd == nil {
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return
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}
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if term.pty == nil {
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term.vterm.SetSize(ctx.Height(), ctx.Width())
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term.closeMutex.Lock()
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if term.cmd == nil {
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term.closeMutex.Unlock()
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return
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}
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tty, err := pty.StartWithAttrs(term.cmd, &winsize, &syscall.SysProcAttr{Setsid: true, Setctty: true, Ctty: 1})
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term.closeMutex.Unlock()
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term.pty = tty
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if err != nil {
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term.vterm.SetView(ctx.View())
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if !term.running && !term.closed && term.cmd != nil {
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go func() {
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defer logging.PanicHandler()
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term.vterm.Watch(term)
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attr := &syscall.SysProcAttr{Setsid: true, Setctty: true, Ctty: 1}
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if err := term.vterm.RunWithAttrs(term.cmd, attr); err != nil {
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logging.Errorf("error running terminal: %w", err)
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term.Close(err)
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term.running = false
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return
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}
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term.start <- nil
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if term.OnStart != nil {
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term.OnStart()
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term.running = false
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term.Close(nil)
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}()
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for {
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if term.cmd.Process != nil {
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term.running = true
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break
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}
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}
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ws, err := pty.GetsizeFull(term.pty)
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if err != nil {
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return
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}
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rows := int(ws.Rows)
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cols := int(ws.Cols)
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if ctx.Width() != cols || ctx.Height() != rows {
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term.writeMutex.Lock()
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err := pty.Setsize(term.pty, &winsize)
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if err != nil {
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logging.Warnf("failed to set terminal size: %v", err)
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}
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term.vterm.SetSize(ctx.Height(), ctx.Width())
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term.writeMutex.Unlock()
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rect := vterm.NewRect(0, ctx.Width(), 0, ctx.Height())
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term.damageMutex.Lock()
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term.damage = append(term.damage, *rect)
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term.damageMutex.Unlock()
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return
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if term.OnStart != nil {
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term.OnStart()
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}
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}
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term.draw()
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}
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screen := term.vterm.ObtainScreen()
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type coords struct {
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x int
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y int
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}
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// naive optimization
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visited := make(map[coords]interface{})
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term.damageMutex.Lock()
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for _, rect := range term.damage {
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for x := rect.StartCol(); x < rect.EndCol() && x < ctx.Width(); x += 1 {
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for y := rect.StartRow(); y < rect.EndRow() && y < ctx.Height(); y += 1 {
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coords := coords{x, y}
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if _, ok := visited[coords]; ok {
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continue
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}
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visited[coords] = nil
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cell, err := screen.GetCellAt(y, x)
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if err != nil {
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continue
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}
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style := term.styleFromCell(cell)
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ctx.Printf(x, y, style, "%s", string(cell.Chars()))
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}
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}
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}
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term.damage = nil
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term.damageMutex.Unlock()
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func (term *Terminal) draw() {
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term.vterm.Draw()
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if term.focus && !term.closed {
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if !term.cursorShown {
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ctx.HideCursor()
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term.ctx.HideCursor()
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} else {
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state := term.vterm.ObtainState()
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row, col := state.GetCursorPos()
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ctx.SetCursor(col, row)
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_, x, y, style := term.vterm.GetCursor()
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term.ctx.SetCursor(x, y)
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term.ctx.SetCursorStyle(style)
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}
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}
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}
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@ -364,29 +159,38 @@ func (term *Terminal) Focus(focus bool) {
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if !term.focus {
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term.ctx.HideCursor()
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} else {
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state := term.vterm.ObtainState()
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row, col := state.GetCursorPos()
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term.ctx.SetCursor(col, row)
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term.Invalidate()
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_, x, y, style := term.vterm.GetCursor()
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term.ctx.SetCursor(x, y)
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term.ctx.SetCursorStyle(style)
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term.invalidate()
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}
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}
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}
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func convertMods(mods tcell.ModMask) vterm.Modifier {
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var (
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ret uint = 0
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mask uint = uint(mods)
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)
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if mask&uint(tcell.ModShift) > 0 {
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ret |= uint(vterm.ModShift)
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// HandleEvent is used to watch the underlying terminal events
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func (term *Terminal) HandleEvent(ev tcell.Event) bool {
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if term.closed || term.destroyed {
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return false
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}
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if mask&uint(tcell.ModCtrl) > 0 {
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ret |= uint(vterm.ModCtrl)
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switch ev := ev.(type) {
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case *views.EventWidgetContent:
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// Draw here for performance improvement. We call draw again in
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// the main Draw, but tcell-term only draws dirty cells, so it
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// won't be too much extra CPU there. Drawing there is needed
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// for certain msgviews, particularly if the pager command
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// exits.
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term.draw()
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// Perform a tcell screen.Show() to show our updates
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// immediately
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term.ctx.Show()
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term.invalidate()
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return true
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case *tcellterm.EventTitle:
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if term.OnTitle != nil {
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term.OnTitle(ev.Title())
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}
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}
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if mask&uint(tcell.ModAlt) > 0 {
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ret |= uint(vterm.ModAlt)
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}
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return vterm.Modifier(ret)
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return false
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}
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func (term *Terminal) Event(event tcell.Event) bool {
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@ -398,107 +202,5 @@ func (term *Terminal) Event(event tcell.Event) bool {
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if term.closed {
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return false
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}
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if event, ok := event.(*tcell.EventKey); ok {
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if event.Key() == tcell.KeyRune {
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term.vterm.KeyboardUnichar(
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event.Rune(), convertMods(event.Modifiers()))
|
||||
} else if key, ok := keyMap[event.Key()]; ok {
|
||||
switch {
|
||||
case key.Key == vterm.KeyNone:
|
||||
term.vterm.KeyboardUnichar(
|
||||
key.Rune, key.Mod)
|
||||
case key.Mod == vterm.ModNone:
|
||||
term.vterm.KeyboardKey(key.Key,
|
||||
convertMods(event.Modifiers()))
|
||||
default:
|
||||
term.vterm.KeyboardKey(key.Key, key.Mod)
|
||||
}
|
||||
}
|
||||
term.flushTerminal()
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
func (term *Terminal) styleFromCell(cell *vterm.ScreenCell) tcell.Style {
|
||||
style := tcell.StyleDefault
|
||||
|
||||
background := cell.Bg()
|
||||
foreground := cell.Fg()
|
||||
|
||||
var (
|
||||
bg tcell.Color
|
||||
fg tcell.Color
|
||||
)
|
||||
switch {
|
||||
case background.IsDefaultBg():
|
||||
bg = tcell.ColorDefault
|
||||
case background.IsIndexed():
|
||||
bg = tcell.Color(tcell.PaletteColor(int(background.GetIndex())))
|
||||
case background.IsRgb():
|
||||
r, g, b := background.GetRGB()
|
||||
bg = tcell.NewRGBColor(int32(r), int32(g), int32(b))
|
||||
}
|
||||
switch {
|
||||
case foreground.IsDefaultFg():
|
||||
fg = tcell.ColorDefault
|
||||
case foreground.IsIndexed():
|
||||
fg = tcell.Color(tcell.PaletteColor(int(foreground.GetIndex())))
|
||||
case foreground.IsRgb():
|
||||
r, g, b := foreground.GetRGB()
|
||||
fg = tcell.NewRGBColor(int32(r), int32(g), int32(b))
|
||||
}
|
||||
|
||||
style = style.Background(bg).Foreground(fg)
|
||||
attrs := cell.Attrs()
|
||||
|
||||
if attrs.Bold != 0 {
|
||||
style = style.Bold(true)
|
||||
}
|
||||
if attrs.Italic != 0 {
|
||||
style = style.Italic(true)
|
||||
}
|
||||
if attrs.Underline != 0 {
|
||||
style = style.Underline(true)
|
||||
}
|
||||
if attrs.Blink != 0 {
|
||||
style = style.Blink(true)
|
||||
}
|
||||
if attrs.Reverse != 0 {
|
||||
style = style.Reverse(true)
|
||||
}
|
||||
return style
|
||||
}
|
||||
|
||||
func (term *Terminal) onDamage(rect *vterm.Rect) int {
|
||||
term.damageMutex.Lock()
|
||||
term.damage = append(term.damage, *rect)
|
||||
term.damageMutex.Unlock()
|
||||
term.invalidate()
|
||||
return 1
|
||||
}
|
||||
|
||||
func (term *Terminal) onMoveCursor(old *vterm.Pos,
|
||||
pos *vterm.Pos, visible bool,
|
||||
) int {
|
||||
rows, cols, _ := pty.Getsize(term.pty)
|
||||
if pos.Row() >= rows || pos.Col() >= cols {
|
||||
return 1
|
||||
}
|
||||
|
||||
term.cursorPos = *pos
|
||||
term.invalidate()
|
||||
return 1
|
||||
}
|
||||
|
||||
func (term *Terminal) onSetTermProp(prop int, val *vterm.VTermValue) int {
|
||||
switch prop {
|
||||
case vterm.VTERM_PROP_TITLE:
|
||||
if term.OnTitle != nil {
|
||||
term.OnTitle(val.String)
|
||||
}
|
||||
case vterm.VTERM_PROP_CURSORVISIBLE:
|
||||
term.cursorShown = val.Boolean
|
||||
term.invalidate()
|
||||
}
|
||||
return 1
|
||||
return term.vterm.HandleEvent(event)
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue