fish-shell/share/tools/web_config/sample_prompts/scales.fish

# name: Scales
# author: Leonard Hecker <leonard@hecker.io>

# Sources:
# - General theme setup: https://github.com/sorin-ionescu/prezto/blob/d275f316ffdd0bbd075afbff677c3e00791fba16/modules/prompt/functions/prompt_sorin_setup
# - Extraction of git info: https://github.com/sorin-ionescu/prezto/blob/d275f316ffdd0bbd075afbff677c3e00791fba16/modules/git/functions/git-info#L180-L441

function fish_prompt
    if test -n "$SSH_TTY"
        echo -n (set_color brred)"$USER"(set_color white)'@'(set_color yellow)(prompt_hostname)' '
    end

    echo -n (set_color blue)(prompt_pwd)' '

    set_color -o
    if fish_is_root_user
        echo -n (set_color red)'# '
    end
    echo -n (set_color red)'❯'(set_color yellow)'❯'(set_color green)'❯ '
    set_color normal

    # And now define the right prompt so that it's brought along
    function fish_right_prompt
        set -l cmd_status $status
        if test $cmd_status -ne 0
            echo -n (set_color red)"✘ $cmd_status"
        end

        if not command -sq git
            set_color normal
            return
        end

        # Get the git directory for later use.
        # Return if not inside a Git repository work tree.
        if not set -l git_dir (command git rev-parse --git-dir 2>/dev/null)
            set_color normal
            return
        end

        # Get the current action ("merge", "rebase", etc.)
        # and if there's one get the current commit hash too.
        set -l commit ''
        if set -l action (fish_print_git_action "$git_dir")
            set commit (command git rev-parse HEAD 2> /dev/null | string sub -l 7)
        end

        # Get either the branch name or a branch descriptor.
        set -l branch_detached 0
        if not set -l branch (command git symbolic-ref --short HEAD 2>/dev/null)
            set branch_detached 1
            set branch (command git describe --contains --all HEAD 2>/dev/null)
        end

        # Get the commit difference counts between local and remote.
        command git rev-list --count --left-right 'HEAD...@{upstream}' 2>/dev/null \
            | read -d \t -l status_ahead status_behind
        if test $status -ne 0
            set status_ahead 0
            set status_behind 0
        end

        # Get the stash status.
        # (git stash list) is very slow. => Avoid using it.
        set -l status_stashed 0
        if test -f "$git_dir/refs/stash"
            set status_stashed 1
        else if test -r "$git_dir/commondir"
            read -l commondir <"$git_dir/commondir"
            if test -f "$commondir/refs/stash"
                set status_stashed 1
            end
        end

        # git-status' porcelain v1 format starts with 2 letters on each line:
        #   The first letter (X) denotes the index state.
        #   The second letter (Y) denotes the working directory state.
        #
        # The following table presents the possible combinations:
        # * The underscore character denotes whitespace.
        # * The cell values stand for the following file states:
        #   a: added
        #   d: deleted
        #   m: modified
        #   r: renamed
        #   u: unmerged
        #   t: untracked
        # * Cells with more than one letter signify that both states
        #   are simultaneously the case. This is possible since the git index
        #   and working directory operate independently of each other.
        # * Cells which are empty are unhandled by this code.
        # * T (= type change) is undocumented.
        #   See Git v1.7.8.2 release notes for more information.
        #
        #   \ Y→
        #  X \
        #  ↓  | A  | C  | D  | M  | R  | T  | U  | X  | B  | ?  | _
        # ----+----+----+----+----+----+----+----+----+----+----+----
        #  A  | u  |    | ad | am | r  | am | u  |    |    |    | a
        #  C  |    |    | ad | am | r  | am | u  |    |    |    | a
        #  D  |    |    | u  | am | r  | am | u  |    |    |    | a
        #  M  |    |    | ad | am | r  | am | u  |    |    |    | a
        #  R  | r  | r  | rd | rm | r  | rm | ur | r  | r  | r  | r
        #  T  |    |    | ad | am | r  | am | u  |    |    |    | a
        #  U  | u  | u  | u  | um | ur | um | u  | u  | u  | u  | u
        #  X  |    |    |    | m  | r  | m  | u  |    |    |    |
        #  B  |    |    |    | m  | r  | m  | u  |    |    |    |
        #  ?  |    |    |    | m  | r  | m  | u  |    |    | t  |
        #  _  |    |    | d  | m  | r  | m  | u  |    |    |    |
        set -l porcelain_status (command git status --porcelain | string sub -l2)

        set -l status_added 0
        if string match -qr '[ACDMT][ MT]|[ACMT]D' $porcelain_status
            set status_added 1
        end
        set -l status_deleted 0
        if string match -qr '[ ACMRT]D' $porcelain_status
            set status_deleted 1
        end
        set -l status_modified 0
        if string match -qr '[MT]$' $porcelain_status
            set status_modified 1
        end
        set -l status_renamed 0
        if string match -qe R $porcelain_status
            set status_renamed 1
        end
        set -l status_unmerged 0
        if string match -qr 'AA|DD|U' $porcelain_status
            set status_unmerged 1
        end
        set -l status_untracked 0
        if string match -qe '\?\?' $porcelain_status
            set status_untracked 1
        end

        set_color -o

        if test -n "$branch"
            if test $branch_detached -ne 0
                set_color brmagenta
            else
                set_color green
            end
            echo -n " $branch"
        end
        if test -n "$commit"
            echo -n ' '(set_color yellow)"$commit"
        end
        if test -n "$action"
            set_color normal
            echo -n (set_color white)':'(set_color -o brred)"$action"
        end
        if test $status_ahead -ne 0
            echo -n ' '(set_color brmagenta)'⬆'
        end
        if test $status_behind -ne 0
            echo -n ' '(set_color brmagenta)'⬇'
        end
        if test $status_stashed -ne 0
            echo -n ' '(set_color cyan)'✭'
        end
        if test $status_added -ne 0
            echo -n ' '(set_color green)'✚'
        end
        if test $status_deleted -ne 0
            echo -n ' '(set_color red)'✖'
        end
        if test $status_modified -ne 0
            echo -n ' '(set_color blue)'✱'
        end
        if test $status_renamed -ne 0
            echo -n ' '(set_color magenta)'➜'
        end
        if test $status_unmerged -ne 0
            echo -n ' '(set_color yellow)'═'
        end
        if test $status_untracked -ne 0
            echo -n ' '(set_color white)'◼'
        end

        set_color normal
    end
end