Start terminal emulator

cmd/micro/shell/terminal.go

@@ -0,0 +1,127 @@
+package shell
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"os/exec"
+	"strconv"
+
+	"github.com/zyedidia/micro/cmd/micro/buffer"
+	"github.com/zyedidia/micro/cmd/micro/screen"
+	"github.com/zyedidia/terminal"
+)
+
+type TermType int
+
+const (
+	TTIdle    = iota // Waiting for a new command
+	TTRunning        // Currently running a command
+	TTDone           // Finished running a command
+)
+
+// A Terminal holds information for the terminal emulator
+type Terminal struct {
+	State     terminal.State
+	Term      *terminal.VT
+	title     string
+	Status    TermType
+	Selection [2]buffer.Loc
+	wait      bool
+	getOutput bool
+	output    *bytes.Buffer
+	callback  string
+}
+
+// HasSelection returns whether this terminal has a valid selection
+func (t *Terminal) HasSelection() bool {
+	return t.Selection[0] != t.Selection[1]
+}
+
+// GetSelection returns the selected text
+func (t *Terminal) GetSelection(width int) string {
+	start := t.Selection[0]
+	end := t.Selection[1]
+	if start.GreaterThan(end) {
+		start, end = end, start
+	}
+	var ret string
+	var l buffer.Loc
+	for y := start.Y; y <= end.Y; y++ {
+		for x := 0; x < width; x++ {
+			l.X, l.Y = x, y
+			if l.GreaterEqual(start) && l.LessThan(end) {
+				c, _, _ := t.State.Cell(x, y)
+				ret += string(c)
+			}
+		}
+	}
+	return ret
+}
+
+// Start begins a new command in this terminal with a given view
+func (t *Terminal) Start(execCmd []string, getOutput bool) error {
+	if len(execCmd) <= 0 {
+		return nil
+	}
+
+	cmd := exec.Command(execCmd[0], execCmd[1:]...)
+	t.output = nil
+	if getOutput {
+		t.output = bytes.NewBuffer([]byte{})
+	}
+	Term, _, err := terminal.Start(&t.State, cmd, t.output)
+	if err != nil {
+		return err
+	}
+	t.Term = Term
+	t.getOutput = getOutput
+	t.Status = TTRunning
+	t.title = execCmd[0] + ":" + strconv.Itoa(cmd.Process.Pid)
+
+	go func() {
+		for {
+			err := Term.Parse()
+			if err != nil {
+				fmt.Fprintln(os.Stderr, "[Press enter to close]")
+				break
+			}
+			screen.Redraw()
+		}
+		// TODO: close Term
+		// closeterm <- view.Num
+	}()
+
+	return nil
+}
+
+// Stop stops execution of the terminal and sets the Status
+// to TTDone
+func (t *Terminal) Stop() {
+	t.Term.File().Close()
+	t.Term.Close()
+	if t.wait {
+		t.Status = TTDone
+	} else {
+		t.Close()
+	}
+}
+
+// Close sets the Status to TTIdle indicating that the terminal
+// is ready for a new command to execute
+func (t *Terminal) Close() {
+	t.Status = TTIdle
+	// call the lua function that the user has given as a callback
+	if t.getOutput {
+		// TODO: plugin callback on Term emulator
+		// _, err := Call(t.callback, t.output.String())
+		// if err != nil && !strings.HasPrefix(err.Error(), "function does not exist") {
+		// 	TermMessage(err)
+		// }
+	}
+}
+
+// WriteString writes a given string to this terminal's pty
+func (t *Terminal) WriteString(str string) {
+	t.Term.File().WriteString(str)
+}