starship_async_transient_prompt.fish

status is-interactive
or exit 0

if test -n "$XDG_RUNTIME_DIR"
    set -g __starship_async_tmpdir "$XDG_RUNTIME_DIR"/fish-async-prompt
else
    set -g __starship_async_tmpdir /tmp/fish-async-prompt
end
mkdir -p "$__starship_async_tmpdir"
set -g __starship_async_signal SIGUSR1

# Starship
set -g VIRTUAL_ENV_DISABLE_PROMPT 1
builtin functions -e fish_mode_prompt
set -gx STARSHIP_SHELL fish
set -gx STARSHIP_SESSION_KEY (random 10000000000000 9999999999999999)

# Transient prompt
function __starship_async_cancel_repaint --on-event fish_cancel
    commandline -f repaint
end
function __starship_async_maybe_execute
    commandline --is-valid
    if test $status != 2
        set -g TRANSIENT 1
        commandline -f repaint
    end
    commandline -f execute
end
function __starship_async_cancel_commandline
    if string length -q -- (commandline)
        set -g TRANSIENT 1
        commandline -f repaint
    end
    commandline -f cancel-commandline
end
function __starship_async_edit_command_buffer
    printf '\e[2F' # 2 lines up
    edit_command_buffer
end
bind \r  __starship_async_maybe_execute       # ENTER
bind \cc __starship_async_cancel_commandline  # CTRL+C
bind \ee __starship_async_edit_command_buffer # ALT+E
bind \ev __starship_async_edit_command_buffer # ALT+V

# Prompt
function fish_prompt
    printf '\e[0J' # Clear from cursor to end of screen
    if test $TRANSIENT -eq 1 &> /dev/null
        set -g TRANSIENT 0
        __starship_async_simple_prompt
    else if test -e "$__starship_async_tmpdir"/"$fish_pid"_fish_prompt
        cat "$__starship_async_tmpdir"/"$fish_pid"_fish_prompt
    else
        __starship_async_simple_prompt
    end
end

# Async task
function __starship_async_fire --on-event fish_prompt
    switch "$fish_key_bindings"
        case fish_hybrid_key_bindings fish_vi_key_bindings
            set STARSHIP_KEYMAP "$fish_bind_mode"
        case '*'
            set STARSHIP_KEYMAP insert
    end
    set STARSHIP_CMD_PIPESTATUS $pipestatus
    set STARSHIP_CMD_STATUS $status
    set STARSHIP_DURATION "$CMD_DURATION"
    set STARSHIP_JOBS (count (jobs -p))

    set -l tmpfile "$__starship_async_tmpdir"/"$fish_pid"_fish_prompt
    fish -c '
    starship prompt --terminal-width="'$COLUMNS'" --status='$STARSHIP_CMD_STATUS' --pipestatus="'$STARSHIP_CMD_PIPESTATUS'" --keymap='$STARSHIP_KEYMAP' --cmd-duration='$STARSHIP_DURATION' --jobs='$STARSHIP_JOBS' > '$tmpfile'
    kill -s "'$__starship_async_signal'" '$fish_pid &
    disown
end

function __starship_async_simple_prompt
    set_color brgreen
    echo -n '❯'
    set_color normal
    echo ' '
end

function __starship_async_repaint_prompt --on-signal "$__starship_async_signal"
    commandline -f repaint
end

function __starship_async_cleanup --on-event fish_exit
    rm -f "$__starship_async_tmpdir"/"$fish_pid"_fish_prompt
end

# https://github.com/acomagu/fish-async-prompt
# https://github.com/fish-shell/fish-shell/issues/8223

how would you add a right prompt to this? @duament

Thanks a lot for this snippet, this is amazing!

On macOS, this works flawlessly.
Unfortunately it doesn't work for me on Ubuntu though.
Whenever I execute a command, then the expected prompt is written to the next line, but not transiently.
But whenever I just press Enter, the default "❯" prompt is printed, without ever being replaced by the real prompt.

Does anybody have the same issue or an idea what the reason for this behaviour could be?
Thanks in advance!

@luca-rath You could try a different terminal emulator (Alacritty, Kitty etc.) and a different fish version (if you installed from apt, maybe you aren't on the most recent 3.6.1 -- try brew instead)

@JanPokorny Thanks for your reply. I've got fish 3.6.1 installed via nix-env, but I've been using the default ubuntu terminal. Using kitty has the same outcome, didn't try alacritty yet. Starship version is 1.16.0, which is the latest as well.

@luca-rath In that case no clue. I actually also stopped using this since it bugged in some places (like integrated IDE terminals)

I found the cause of the problem now ...
I had the starship_async_transient_prompt.fish file inside my .config/fish/conf.d/ directory, which is correct, but I also still had the starship init fish | source line in my .config/fish/config.fish, which I wasn't supposed to have, my bad.