Change color of hostname in Fish shell prompt

Question

I'm migrating to a new Mac, and I'm having trouble setting up my shell to match the old one.

Old:

New:

Notice the host color is different? I copied the entire .config/fish folder over to the computer, but it's still not working. The only difference I can think of is the version - 2.1.2, vs. 2.5.0. Here's my fish_prompt.fish:

function fish_prompt --description 'Write out the prompt'

    set -l last_status $status

    # Just calculate these once, to save a few cycles when displaying the prompt
    if not set -q __fish_prompt_hostname
        set -g __fish_prompt_hostname (hostname|cut -d . -f 1)
    end

    if not set -q __fish_prompt_normal
        set -g __fish_prompt_normal (set_color normal)
    end

    if not set -q -g __fish_classic_git_functions_defined
        set -g __fish_classic_git_functions_defined

        function __fish_repaint_user --on-variable fish_color_user --description "Event handler, repaint when fish_color_user changes"
            if status --is-interactive
                set -e __fish_prompt_user
                commandline -f repaint ^/dev/null
            end
        end

        function __fish_repaint_host --on-variable fish_color_host --description "Event handler, repaint when fish_color_host changes"
            if status --is-interactive
                set -e __fish_prompt_host
                commandline -f repaint ^/dev/null
            end
        end

        function __fish_repaint_status --on-variable fish_color_status --description "Event handler; repaint when fish_color_status changes"
            if status --is-interactive
                set -e __fish_prompt_status
                commandline -f repaint ^/dev/null
            end
        end
    end

    set -l delim '>'

    switch $USER

    case root

        if not set -q __fish_prompt_cwd
            if set -q fish_color_cwd_root
                set -g __fish_prompt_cwd (set_color $fish_color_cwd_root)
            else
                set -g __fish_prompt_cwd (set_color $fish_color_cwd)
            end
        end

    case '*'

        if not set -q __fish_prompt_cwd
            set -g __fish_prompt_cwd (set_color $fish_color_cwd)
        end

    end

    set -l prompt_status
    if test $last_status -ne 0
        if not set -q __fish_prompt_status
            set -g __fish_prompt_status (set_color $fish_color_status)
        end
        set prompt_status "$__fish_prompt_status [$last_status]$__fish_prompt_normal"
    end

    if not set -q __fish_prompt_user
        set -g __fish_prompt_user (set_color $fish_color_user)
    end
    if not set -q __fish_prompt_host
        set -g __fish_prompt_host (set_color $fish_color_host)
    end

    echo -n -s "$__fish_prompt_user" "$USER" "$__fish_prompt_normal" @ "$__fish_prompt_host" "$__fish_prompt_hostname" "$__fish_prompt_normal" ' ' "$__fish_prompt_cwd" (prompt_pwd) (__fish_git_prompt) "$__fish_prompt_normal" "$prompt_status" "$delim" ' '
end

Answer 1

This is a consequence of fish color settings being stored as universal variables that are machine specific. If you look in your ~/.config/fish directory you'll see one or more files named fishd.* where the wildcard matches the mac address of the primary network interface of your computer. This is something many of us have argued should be changed. See this issue. The solution is to simply copy the fish_color_* entries from the fishd file for your old system to your new one.