Bash window title

[jgournet]

Hi there,

It's really low priority, as it's cosmetic and highly dependent on configuration, but just wanted to mention: I'm using "Konsole", and by default, the bash window title is "folder : software_running"

When launching any application installed via binenv, I get: "folder : software_version" => is there a way to change binenv so it would reflect the software running ?

[leucos]

I think this is terminal+shell dependent and it is not actionable on the binenv side.

[leucos]

Ok I get it. We probably can get away by unsafe-changing argv[0], something like:

func SetProcessName(name string) error {
    argv0str := (*reflect.StringHeader)(unsafe.Pointer(&os.Args[0]))
    argv0 := (*[1 << 30]byte)(unsafe.Pointer(argv0str.Data))[:argv0str.Len]

    n := copy(argv0, name)
    if n < len(argv0) {
            argv0[n] = 0
    }

    return nil
}

Will check this.

[leucos]

After taking a third look at this, the above solution won't work, since it has to be made in the binary itself, something we of course do not control.

The only way I see is to change binaries layout, and instead of having binaries in the distribution name like this:

$ ls -la ~/.binenv/binaries/terraform/
-rwxr-x---   0.13.1*
-rwxr-x---   0.13.5*
...

we could use another directory level using version, and a properly name binary inside like so:

$ ls -la ~/.binenv/binaries/terraform/
drwxr-x---   0.13.1/
drwxr-x---   0.13.5/
$ ls -la ~/.binenv/binaries/terraform/0.13.1/
-rwxr-x---   terraform*
...

However it is not easy to transition the current installations to a new directory layout.

[lmorg]

There is an ANSI escape code for changing the terminal emulators window title:

package ansititle

import (
	"bytes"
	"errors"
	"os"

	"golang.org/x/crypto/ssh/terminal"
)

func Write(title []byte) error {
	fd := os.Stdout.Fd()
	if !terminal.IsTerminal(int(fd)) {
		return errors.New("not a TTY")
	}

	_, err := os.Stdout.Write(formatTitle(title))
	return err
}

func formatTitle(title []byte) []byte {
	if len(title) == 0 {
		return nil
	}
	title = sanatise(title)
	ansi := make([]byte, len(title)+5)

	copy(ansi[0:4], []byte{27, ']', '0', ';'})
	copy(ansi[4:len(title)+4], title)
	ansi[len(ansi)-1] = 7

	return ansi
}

func sanatise(b []byte) []byte {
	b = bytes.ReplaceAll(b, []byte{'\r'}, nil)
	// replace all control characters with space
	for i := range b {
		if b[i] < 32 || b[i] == 127 {
			b[i] = 32
		}
	}

	return b
}

(adapted from: https://github.com/lmorg/murex/tree/master/utils/ansititle)

The issue is while some terminal emulators seems to honour this, Konsole by default does not. That's up to the user to change in their tab settings (I've not found a way to force change that myself).

However you can query what the tab title format is with this command:

qdbus $KONSOLE_DBUS_SERVICE $KONSOLE_DBUS_SESSION org.kde.konsole.Session.tabTitleFormat $KONSOLE_DBUS_WINDOW