make stdout upside down

1 files changed, 49 insertions, 0 deletions

diff --git a/stdoutShow.go b/stdoutShow.go
index 94c7a1f..61f2246 100644
--- a/stdoutShow.go
+++ b/stdoutShow.go
@@ -6,6 +6,8 @@ package main
 import (
 	"errors"
 	"fmt"
+	"slices"
+	"strings"
 
 	"github.com/awesome-gocui/gocui"
 
@@ -126,3 +128,50 @@ func (tk *guiWidget) relocateStdout(w int, h int) {
 	me.baseGui.SetView("msg", w0, h0, w1, h1, 0)
 	// me.baseGui.SetViewOnBottom("msg")
 }
+
+// from the gocui devs:
+// Write appends a byte slice into the view's internal buffer. Because
+// View implements the io.Writer interface, it can be passed as parameter
+// of functions like fmt.Fprintf, fmt.Fprintln, io.Copy, etc. Clear must
+// be called to clear the view's buffer.
+
+func (w *guiWidget) Write(p []byte) (n int, err error) {
+	w.tainted = true
+	me.writeMutex.Lock()
+	defer me.writeMutex.Unlock()
+
+	tk := me.stdout.tk
+
+	if tk.v == nil {
+		// optionally write the output to /tmp
+		s := fmt.Sprint(string(p))
+		s = strings.TrimSuffix(s, "\n")
+		fmt.Fprintln(outf, s)
+		v, _ := me.baseGui.View("msg")
+		if v != nil {
+			// fmt.Fprintln(outf, "found msg")
+			tk.v = v
+		}
+	} else {
+		// display the output in the gocui window
+		lines := strings.Split(strings.TrimSpace(string(p)), "\n")
+		me.stdout.outputS = append(me.stdout.outputS, lines...)
+
+		var cur []string
+		// chop off the last lines in the buffer
+		chop := len(me.stdout.outputS) - (me.stdout.h - 1)
+		if chop < 0 {
+			chop = 0
+		}
+		if len(me.stdout.outputS) > chop {
+			cur = append(cur, me.stdout.outputS[chop:]...)
+		} else {
+			cur = append(cur, me.stdout.outputS...)
+		}
+		slices.Reverse(cur)
+		tk.v.Clear()
+		fmt.Fprintln(tk.v, strings.Join(cur, "\n"))
+	}
+
+	return len(p), nil
+}