oh-my-fish_theme-bobthefish/functions/fish_prompt.fish

# name: bobthefish
#
# bobthefish is a Powerline-style, Git-aware fish theme optimized for awesome.
#
# You will need a Powerline-patched font for this to work:
#
#     https://powerline.readthedocs.org/en/master/installation.html#patched-fonts
#
# I recommend picking one of these:
#
#     https://github.com/Lokaltog/powerline-fonts
#
# For more advanced awesome, install a nerd fonts patched font (and be sure to
# enable nerd fonts support with `set -g theme_nerd_fonts yes`):
#
#     https://github.com/ryanoasis/nerd-fonts
#
# See README.md for setup and configuration options.
#
# ==============================
# Helper methods
# ==============================

function __bobthefish_basename -d 'basically basename, but faster'
    string replace -r '^.*/' '' -- $argv
end

function __bobthefish_dirname -d 'basically dirname, but faster'
    string replace -r '/[^/]+/?$' '' -- $argv
end

function __bobthefish_pwd -d 'Get a normalized $PWD'
    # The pwd builtin accepts `-P` on at least Fish 3.x, but fall back to $PWD if that doesn't work
    builtin pwd -P 2>/dev/null
    or echo $PWD
end

# Note that for fish < 3.0 this falls back to unescaped, rather than trying to do something clever /shrug
# After we drop support for older fishies, we can inline this without the fallback.
function __bobthefish_escape_regex -a str -d 'A backwards-compatible `string escape --style=regex` implementation'
    string escape --style=regex "$str" 2>/dev/null
    or echo "$str"
end

function __bobthefish_version_at_least -S -a required -a actual -d 'Compare dotted numeric versions'
    set -l required_parts (string split . -- "$required")
    set -l actual_parts (string split . -- "$actual")

    for i in 1 2 3
        set -l required_part $required_parts[$i]
        set -l actual_part $actual_parts[$i]

        [ -n "$required_part" ]
        or set required_part 0
        [ -n "$actual_part" ]
        or set actual_part 0

        if [ $actual_part -gt $required_part ]
            return 0
        else if [ $actual_part -lt $required_part ]
            return 1
        end
    end

    return 0
end

__bobthefish_git_async_init

function __bobthefish_fossil_branch -S -d 'Get the current fossil branch'
    set -l branch (command fossil branch 2>/dev/null | string trim --left --chars=' *')
    echo "$branch_glyph $branch"
end

function __bobthefish_hg_branch -S -d 'Get the current hg branch'
    set -l branch (command hg branch 2>/dev/null)
    set -l book (command hg book 2>/dev/null | string replace --filter -r '^\s*\*\s+(\S+).*' '$1')
    echo "$branch_glyph $branch @ $book"
end

function __bobthefish_pretty_parent -S -a child_dir -d 'Print a parent directory, shortened to fit the prompt'
    set -q fish_prompt_pwd_dir_length
    or set -l fish_prompt_pwd_dir_length 1

    # Replace $HOME with ~
    set -l real_home ~
    set -l parent_dir (string replace -r '^'(__bobthefish_escape_regex "$real_home")'($|/)' '~$1' (__bobthefish_dirname $child_dir))

    # Must check whether `$parent_dir = /` if using native dirname
    if [ -z "$parent_dir" ]
        echo -n /
        return
    end

    if [ $fish_prompt_pwd_dir_length -eq 0 ]
        echo -n "$parent_dir/"
        return
    end

    string replace -ar '(\.?[^/]{'"$fish_prompt_pwd_dir_length"'})[^/]*/' '$1/' "$parent_dir/"
end

function __bobthefish_ignore_vcs_dir -a real_pwd -d 'Check whether the current directory should be ignored as a VCS segment'
    for p in $theme_vcs_ignore_paths
        set ignore_path (realpath $p 2>/dev/null)
        switch $real_pwd/
            case $ignore_path/\*
                echo 1
                return
        end
    end
end

function __bobthefish_git_project_dir -S -a real_pwd -d 'Print the current git project base directory'
    [ "$theme_display_git" = no ]
    and return

    command -q git
    or return

    set -q theme_vcs_ignore_paths
    and [ (__bobthefish_ignore_vcs_dir $real_pwd) ]
    and return

    if [ "$theme_git_worktree_support" != yes ]
        set -l git_toplevel (command git rev-parse --show-toplevel 2>/dev/null)

        [ -z "$git_toplevel" ]
        and return

        ## Support Git under WSL (see #336)
        # command -q wslpath
        # and set git_toplevel (command wslpath $git_toplevel)

        # If there are no symlinks, just use git toplevel
        switch $real_pwd/
            case $git_toplevel/\*
                echo $git_toplevel
                return
        end

        # Otherwise, we need to find the equivalent directory in the $PWD
        set -l d $real_pwd
        while not [ -z "$d" ]
            if [ (realpath "$d") = "$git_toplevel" ]
                echo $d
                return
            end

            [ "$d" = / ]
            and return

            set d (__bobthefish_dirname $d)
        end
        return
    end

    set -l git_dir (command git rev-parse --git-dir 2>/dev/null)
    or return

    pushd $git_dir
    set git_dir (__bobthefish_pwd)
    popd

    switch $real_pwd/
        case $git_dir/\*
            # Nothing works quite right if we're inside the git dir
            # TODO: fix the underlying issues then re-enable the stuff below

            # # if we're inside the git dir, sweet. just return that.
            # set -l toplevel (command git rev-parse --show-toplevel 2>/dev/null)
            # if [ "$toplevel" ]
            #   switch $git_dir/
            #     case $toplevel/\*
            #       echo $git_dir
            #   end
            # end
            return
    end

    set -l project_dir (__bobthefish_dirname $git_dir)

    switch $real_pwd/
        case $project_dir/\*
            echo $project_dir
            return
    end

    set project_dir (command git rev-parse --show-toplevel 2>/dev/null)
    switch $real_pwd/
        case $project_dir/\*
            echo $project_dir
    end
end

function __bobthefish_fossil_project_dir -S -a real_pwd -d 'Print the current fossil project base directory'
    [ "$theme_display_fossil" = yes ]
    and command -q fossil
    and set -f dir (command fossil json status 2>/dev/null | string replace --filter -r '^\s*"localRoot"\s*:\s*"([^"]*)".*' '$1' | string trim --chars=/)
    or return

    set -q theme_vcs_ignore_paths
    and [ (__bobthefish_ignore_vcs_dir $real_pwd) ]
    and return

    echo "/$dir"
end

function __bobthefish_hg_project_dir -S -a real_pwd -d 'Print the current hg project base directory'
    [ "$theme_display_hg" = yes ]
    and command -q hg
    or return

    set -q theme_vcs_ignore_paths
    and [ (__bobthefish_ignore_vcs_dir $real_pwd) ]
    and return

    set -l d $real_pwd
    while not [ -z "$d" ]
        if [ -e $d/.hg ]
            command hg root --cwd "$d" 2>/dev/null
            return
        end

        [ "$d" = / ]
        and return

        set d (__bobthefish_dirname $d)
    end
end

function __bobthefish_project_pwd -S -a project_root_dir -a real_pwd -d 'Print the working directory relative to project root'
    set -q theme_project_dir_length
    or set -l theme_project_dir_length 0

    set -l project_dir (string replace -r '^'(__bobthefish_escape_regex "$project_root_dir")'($|/)' '' $real_pwd)

    if [ $theme_project_dir_length -eq 0 ]
        echo -n $project_dir
        return
    end

    string replace -ar '(\.?[^/]{'"$theme_project_dir_length"'})[^/]*/' '$1/' $project_dir
end

# ==============================
# Segment functions
# ==============================

function __bobthefish_start_segment -S -d 'Start a prompt segment'
    set -l bg $argv[1]
    set -e argv[1]
    set -l fg $argv[1]
    set -e argv[1]

    set_color normal # clear out anything bold or underline...
    set_color -b $bg $fg $argv

    switch "$__bobthefish_current_bg"
        case ''
            # If there's no background, just start one
            echo -n ' '
        case "$bg"
            # If the background is already the same color, draw a separator
            echo -ns $right_arrow_glyph ' '
        case '*'
            # otherwise, draw the end of the previous segment and the start of the next
            set_color $__bobthefish_current_bg
            echo -ns $right_black_arrow_glyph ' '
            set_color $fg $argv
    end

    set __bobthefish_current_bg $bg
end

function __bobthefish_path_segment -S -a segment_dir -a path_type -d 'Display a shortened form of a directory'
    set -l segment_color $color_path
    set -l segment_basename_color $color_path_basename

    if not [ -w "$segment_dir" ]
        set segment_color $color_path_nowrite
        set segment_basename_color $color_path_nowrite_basename
    end

    __bobthefish_start_segment $segment_color

    set -l directory
    set -l parent

    switch "$segment_dir"
        case /
            set directory /
        case "$HOME"
            set directory '~'
        case '*'
            set parent (__bobthefish_pretty_parent "$segment_dir")
            set directory (__bobthefish_basename "$segment_dir")
    end

    [ "$theme_show_project_parent" != no -o "$path_type" != project ]
    and echo -n $parent

    set_color -b $segment_basename_color
    echo -ns $directory ' '
end

function __bobthefish_finish_segments -S -d 'Close open prompt segments'
    if [ -n "$__bobthefish_current_bg" ]
        set_color normal
        set_color $__bobthefish_current_bg
        echo -ns $right_black_arrow_glyph ' '
    end

    if [ "$theme_newline_cursor" = yes ]
        echo -ens "\n"
        set_color $fish_color_autosuggestion

        if set -q theme_newline_prompt
            echo -ens "$theme_newline_prompt"
        else if [ "$theme_powerline_fonts" = no -a "$theme_nerd_fonts" != yes ]
            echo -ns '> '
        else
            echo -ns "$right_arrow_glyph "
        end
    else if [ "$theme_newline_cursor" = clean ]
        echo -ens "\n"
    end

    set_color normal
    set __bobthefish_current_bg
end

# ==============================
# Status segment
# ==============================

function __bobthefish_prompt_status -S -a last_status -d 'Display flags for a non-zero exit status, private mode, root user, and background jobs'
    set -l nonzero
    set -l superuser
    set -l bg_jobs

    # Last exit was nonzero
    [ $last_status -ne 0 ]
    and set nonzero 1

    # If superuser (uid == 0)
    #
    # Note that iff the current user is root and '/' is not writeable by root this
    # will be wrong. But I can't think of a single reason that would happen, and
    # it is literally 99.5% faster to check it this way, so that's a tradeoff I'm
    # willing to make.
    [ -w / -o -w /private/ ]
    and [ (id -u) -eq 0 ]
    and set superuser 1

    # Jobs display
    if set -q AUTOJUMP_SOURCED
        # Autojump special case: check if there are jobs besides the `autojump`
        # job, since that one is (briefly) backgrounded every time we `cd`
        set bg_jobs (count (jobs -c | string match -v --regex '(Command|autojump)'))
        [ "$bg_jobs" -eq 0 ]
        and set bg_jobs # clear it out so it doesn't show when `0`
    else
        if [ "$theme_display_jobs_verbose" = yes ]
            set bg_jobs (count (jobs -p))
            [ "$bg_jobs" -eq 0 ]
            and set bg_jobs # clear it out so it doesn't show when `0`
        else
            # `jobs -p` is faster if we redirect to /dev/null, because it exits
            # after the first match. We'll use that unless the user wants to
            # display the actual job count
            jobs -p >/dev/null
            and set bg_jobs 1
        end
    end

    if [ "$nonzero" -o "$fish_private_mode" -o "$superuser" -o "$bg_jobs" ]
        __bobthefish_start_segment $color_initial_segment_exit
        if [ "$nonzero" ]
            set_color normal
            set_color -b $color_initial_segment_exit
            if [ "$theme_show_exit_status" = yes ]
                echo -ns $last_status ' '
            else
                echo -n $nonzero_exit_glyph
            end
        end

        if [ "$fish_private_mode" ]
            set_color normal
            set_color -b $color_initial_segment_private
            echo -n $private_glyph
        end

        if [ "$superuser" ]
            set_color normal
            if [ -z "$FAKEROOTKEY" ]
                set_color -b $color_initial_segment_su
            else
                set_color -b $color_initial_segment_exit
            end

            echo -n $superuser_glyph
        end

        if [ "$bg_jobs" ]
            set_color normal
            set_color -b $color_initial_segment_jobs
            if [ "$theme_display_jobs_verbose" = yes ]
                echo -ns $bg_job_glyph $bg_jobs ' '
            else
                echo -n $bg_job_glyph
            end
        end
    end
end

# ==============================
# Container and VM segments
# ==============================

function __bobthefish_prompt_vagrant -S -d 'Display Vagrant status'
    [ "$theme_display_vagrant" = yes -a -f Vagrantfile ]
    or return

    # .vagrant/machines/$machine/$provider/id
    for file in .vagrant/machines/*/*/id
        read -l id <"$file"

        if [ -n "$id" ]
            switch "$file"
                case '*/virtualbox/id'
                    __bobthefish_prompt_vagrant_vbox $id
                case '*/vmware_fusion/id'
                    __bobthefish_prompt_vagrant_vmware $id
                case '*/parallels/id'
                    __bobthefish_prompt_vagrant_parallels $id
            end
        end
    end
end

function __bobthefish_prompt_vagrant_vbox -S -a id -d 'Display VirtualBox Vagrant status'
    set -l vagrant_status
    set -l vm_status (VBoxManage showvminfo --machinereadable $id 2>/dev/null | string replace --filter -r '^VMState="(.*)"$' '$1')

    switch "$vm_status"
        case running
            set vagrant_status "$vagrant_status$vagrant_running_glyph"
        case poweroff
            set vagrant_status "$vagrant_status$vagrant_poweroff_glyph"
        case aborted
            set vagrant_status "$vagrant_status$vagrant_aborted_glyph"
        case saved
            set vagrant_status "$vagrant_status$vagrant_saved_glyph"
        case stopping
            set vagrant_status "$vagrant_status$vagrant_stopping_glyph"
        case ''
            set vagrant_status "$vagrant_status$vagrant_unknown_glyph"
    end

    [ -z "$vagrant_status" ]
    and return

    __bobthefish_start_segment $color_vagrant
    echo -ns $vagrant_status ' '
end

function __bobthefish_prompt_vagrant_vmware -S -a id -d 'Display VMWare Vagrant status'
    set -l vagrant_status
    if [ (pgrep -f "$id") ]
        set vagrant_status "$vagrant_status$vagrant_running_glyph"
    else
        set vagrant_status "$vagrant_status$vagrant_poweroff_glyph"
    end

    [ -z "$vagrant_status" ]
    and return

    __bobthefish_start_segment $color_vagrant
    echo -ns $vagrant_status ' '
end

function __bobthefish_prompt_vagrant_parallels -S -d 'Display Parallels Vagrant status'
    set -l vagrant_status
    set -l vm_status (prlctl list $id -o status 2>/dev/null)
    set vm_status $vm_status[-1]

    switch "$vm_status"
        case running
            set vagrant_status "$vagrant_status$vagrant_running_glyph"
        case stopped
            set vagrant_status "$vagrant_status$vagrant_poweroff_glyph"
        case paused
            set vagrant_status "$vagrant_status$vagrant_saved_glyph"
        case suspended
            set vagrant_status "$vagrant_status$vagrant_saved_glyph"
        case stopping
            set vagrant_status "$vagrant_status$vagrant_stopping_glyph"
        case ''
            set vagrant_status "$vagrant_status$vagrant_unknown_glyph"
    end

    [ -z "$vagrant_status" ]
    and return

    __bobthefish_start_segment $color_vagrant
    echo -ns $vagrant_status ' '
end

function __bobthefish_prompt_docker -S -d 'Display Docker machine name'
    [ "$theme_display_docker_machine" = no -o -z "$DOCKER_MACHINE_NAME" ]
    and return

    __bobthefish_start_segment $color_vagrant
    echo -ns $DOCKER_MACHINE_NAME ' '
end

function __bobthefish_k8s_context -S -d 'Get the current k8s context'
    set -l config_paths "$HOME/.kube/config"
    [ -n "$KUBECONFIG" ]
    and set config_paths (string split ':' "$KUBECONFIG") $config_paths

    for file in $config_paths
        [ -f "$file" ]
        or continue

        while read -l key val
            if [ "$key" = 'current-context:' ]
                set -l context (string trim -c '"\' ' -- $val)
                [ -z "$context" ]
                and return 1

                echo $context
                return
            end
        end <$file
    end

    return 1
end

function __bobthefish_k8s_namespace -S -d 'Get the current k8s namespace'
    kubectl config view --minify --output "jsonpath={..namespace}"
end

function __bobthefish_prompt_k8s_context -S -d 'Show current Kubernetes context'
    [ "$theme_display_k8s_context" = yes ]
    or return

    set -l context (__bobthefish_k8s_context)
    or return

    [ "$theme_display_k8s_namespace" = yes ]
    and set -l namespace (__bobthefish_k8s_namespace)

    [ -z "$context" -o "$context" = default ]
    and [ -z "$namespace" -o "$namespace" = default ]
    and return

    set -l segment $k8s_glyph ' '
    [ "$context" != default ]
    and set segment $segment $context
    [ "$namespace" != default ]
    and set segment $segment ':' $namespace

    __bobthefish_start_segment $color_k8s
    echo -ns $segment ' '
end

# ==============================
# Cloud Tools
# ==============================

function __bobthefish_prompt_aws_vault_profile -S -d 'Show AWS Vault profile'
    [ "$theme_display_aws_vault_profile" = yes ]
    or return

    [ -n "$AWS_VAULT" -a -n "$AWS_CREDENTIAL_EXPIRATION" ]
    or return

    set -l profile $AWS_VAULT

    set -l now (date --utc +%s)
    set -l expiry (date -d "$AWS_CREDENTIAL_EXPIRATION" +%s)
    set -l diff_mins (math "floor(( $expiry - $now ) / 60)")

    set -l diff_time $diff_mins"m"
    [ $diff_mins -le 0 ]
    and set -l diff_time 0m
    [ $diff_mins -ge 60 ]
    and set -l diff_time (math "floor($diff_mins / 60)")"h"(math "$diff_mins % 60")"m"

    set -l segment $profile ' (' $diff_time ')'
    set -l status_color $color_aws_vault
    [ $diff_mins -le 0 ]
    and set -l status_color $color_aws_vault_expired

    __bobthefish_start_segment $status_color
    echo -ns $segment ' '
end

# ==============================
# User / hostname info segments
# ==============================

# Polyfill for fish < 2.5.0
if not type -q prompt_hostname
    if not set -q __bobthefish_prompt_hostname
        set -g __bobthefish_prompt_hostname (uname -n | string replace -r '\..*' '')
    end

    function prompt_hostname
        echo $__bobthefish_prompt_hostname
    end
end

function __bobthefish_prompt_user -S -d 'Display current user and hostname'
    [ "$theme_display_user" = yes -o \( "$theme_display_user" != no -a -n "$SSH_CLIENT" \) -o \( -n "$default_user" -a "$USER" != "$default_user" \) ]
    and set -l display_user

    [ "$theme_display_sudo_user" = yes -a -n "$SUDO_USER" ]
    and set -l display_sudo_user

    [ "$theme_display_hostname" = yes -o \( "$theme_display_hostname" != no -a -n "$SSH_CLIENT" \) ]
    and set -l display_hostname

    if set -q display_user
        __bobthefish_start_segment $color_username
        [ -n "$USER" ]
        and echo -ns $USER
        or echo -ns (whoami)
    end

    if set -q display_sudo_user
        if set -q display_user
            echo -ns ' '
        else
            __bobthefish_start_segment $color_username
        end
        echo -ns "($SUDO_USER)"
    end

    if set -q display_hostname
        if set -q display_user
            or set -q display_sudo_user
            # reset colors without starting a new segment...
            # (so we can have a bold username and non-bold hostname)
            set_color normal
            set_color -b $color_hostname[1] $color_hostname[2..-1]
            echo -ns '@' (prompt_hostname)
        else
            __bobthefish_start_segment $color_hostname
            echo -ns (prompt_hostname)
        end
    end

    set -q display_user
    or set -q display_sudo_user
    or set -q display_hostname
    and echo -ns ' '
end

# ==============================
# Virtual environment segments
# ==============================

function __bobthefish_rvm_parse_ruby -S -a ruby_string -a scope -d 'Parse RVM Ruby string'
    # Function arguments:
    # - 'ruby-2.2.3@rails', 'jruby-1.7.19'...
    # - 'default' or 'current'
    set -l ruby_parts (string split @ -- "$ruby_string")
    set __rvm_{$scope}_ruby_gemset $ruby_parts[2]

    set -l ruby_version_parts (string split - -- $ruby_parts[1])
    set __rvm_{$scope}_ruby_interpreter $ruby_version_parts[1]
    set __rvm_{$scope}_ruby_version $ruby_version_parts[2]
end

function __bobthefish_rvm_info -S -d 'Current Ruby information from RVM'
    # look for rvm install path
    set -q rvm_path
    or set -l rvm_path ~/.rvm /usr/local/rvm

    set -l __rvm_default_ruby
    for env_file in $rvm_path/environments/default
        [ -e "$env_file" ]
        or continue

        set -l gem_home (string replace --filter -r "^.*GEM_HOME='?([^']*)'?.*" '$1' <"$env_file")
        [ "$gem_home" ]
        and set __rvm_default_ruby (__bobthefish_basename "$gem_home")
        and break
    end

    set -l __rvm_current_ruby (rvm-prompt i v g)

    [ "$__rvm_default_ruby" = "$__rvm_current_ruby" ]
    and return

    set -l __rvm_default_ruby_gemset
    set -l __rvm_default_ruby_interpreter
    set -l __rvm_default_ruby_version
    set -l __rvm_current_ruby_gemset
    set -l __rvm_current_ruby_interpreter
    set -l __rvm_current_ruby_version

    # Parse default and current Rubies to global variables
    __bobthefish_rvm_parse_ruby $__rvm_default_ruby default
    __bobthefish_rvm_parse_ruby $__rvm_current_ruby current
    # Show unobtrusive RVM prompt

    # If interpreter differs form default interpreter, show everything:
    if [ "$__rvm_default_ruby_interpreter" != "$__rvm_current_ruby_interpreter" ]
        if [ "$__rvm_current_ruby_gemset" = global ]
            rvm-prompt i v
        else
            rvm-prompt i v g
        end
        # If version differs form default version
    else if [ "$__rvm_default_ruby_version" != "$__rvm_current_ruby_version" ]
        if [ "$__rvm_current_ruby_gemset" = global ]
            rvm-prompt v
        else
            rvm-prompt v g
        end
        # If gemset differs form default or 'global' gemset, just show it
    else if [ "$__rvm_default_ruby_gemset" != "$__rvm_current_ruby_gemset" ]
        rvm-prompt g
    end
end

function __bobthefish_prompt_rubies -S -d 'Display current Ruby information'
    [ "$theme_display_ruby" = no ]
    and return

    set -l ruby_version
    if command -q rvm-prompt
        set ruby_version (__bobthefish_rvm_info)
    else if command -q rbenv
        set ruby_version (rbenv version-name)
        # Don't show global ruby version...
        set -q RBENV_ROOT
        or set -l RBENV_ROOT $HOME/.rbenv

        [ -e "$RBENV_ROOT/version" ]
        and read -l global_ruby_version <"$RBENV_ROOT/version"

        [ "$global_ruby_version" ]
        or set -l global_ruby_version system

        [ "$ruby_version" = "$global_ruby_version" ]
        and return
    else if type -q chruby # chruby is implemented as a function, so using type -q is intentional
        set ruby_version $RUBY_VERSION
    else if command -q asdf
        set -l asdf_current_ruby (asdf current ruby 2>/dev/null)
        or return

        echo "$asdf_current_ruby" | read -l _asdf_plugin asdf_ruby_version asdf_provenance

        # If asdf changes their ruby version provenance format, update this to match
        [ (string trim -- "$asdf_provenance") = "$HOME/.tool-versions" ]
        and return

        set ruby_version $asdf_ruby_version
    end

    [ -z "$ruby_version" ]
    and return

    __bobthefish_start_segment $color_rvm
    echo -ns $ruby_glyph $ruby_version ' '
end

function __bobthefish_prompt_golang -S -a real_pwd -d 'Display current Go information'
    # setting is 'no', don't display the prompt
    [ "$theme_display_go" = no ]
    and return

    # find the closest go.mod
    set -l gomod_version 0
    set -l d $real_pwd
    while not [ -z "$d" ]
        if [ -e $d/go.mod ]
            string match -rq '^go\s(?<gomod_version>\S+)' <"$d/go.mod"
            break
        end

        [ "$d" = / ]
        and return

        set d (__bobthefish_dirname $d)
    end

    # no go.mod, not in a go project, don't display the prompt
    if [ "$gomod_version" = 0 ]
        return
    end

    # check if there's a Go executable
    set -l no_go_installed 0
    set -l actual_go_version 0
    set -l high_enough_version 0
    if command -q go
        set actual_go_version (go version | string replace --filter -r 'go version go(\\d+\\.\\d+(?:\\.\\d+)?).*' '$1')
        if __bobthefish_version_at_least "$gomod_version" "$actual_go_version"
            set high_enough_version 1
        end
    else
        set no_go_installed 1
    end

    if [ "$high_enough_version" = 1 ]
        __bobthefish_start_segment $color_virtualgo
    else
        __bobthefish_start_segment $color_rvm
    end

    echo -ns $go_glyph
    echo -ns "$gomod_version "

    # showing the prompt -- but plain ( for 'yes' ) or verbose?
    if [ "$theme_display_go" = verbose ]
        if [ "$actual_go_version" != 0 ]
            # show the prompt with the required version AND the currently available
            # version; same color rules as above
            echo -ns " ($actual_go_version)"
        end
    end
end

function __bobthefish_virtualenv_python_version -S -d 'Get current Python version'
    switch (python --version 2>&1 | string join ' ')
        case 'Python 2*PyPy*'
            echo $pypy_glyph
        case 'Python 3*PyPy*'
            echo -s $pypy_glyph $superscript_glyph[3]
        case 'Python 2*'
            echo $superscript_glyph[2]
        case 'Python 3*'
            echo $superscript_glyph[3]
    end
end

function __bobthefish_prompt_virtualfish -S -d "Display current Python virtual environment (only for virtualfish, virtualenv's activate.fish changes prompt by itself) or conda environment."
    command -q python
    or return

    [ "$theme_display_virtualenv" = no -o -z "$VIRTUAL_ENV" -a -z "$CONDA_DEFAULT_ENV" ]
    and return

    set -l version_glyph (__bobthefish_virtualenv_python_version)
    set -l prompt_style default

    if [ "$version_glyph" ]
        __bobthefish_start_segment $color_virtualfish
        if string match -q "Python 2*" (python --version 2>&1 | string trim)
            set prompt_style verbose
        else if [ "$theme_display_virtualenv" = verbose ]
            set prompt_style verbose
        end

        if [ "$prompt_style" = verbose ]
            echo -ns $virtualenv_glyph $version_glyph ' '
        else
            echo -ns $virtualenv_glyph
        end

    end

    if [ "$VIRTUAL_ENV" ]
        echo -ns (__bobthefish_basename "$VIRTUAL_ENV") ' '
    else if [ "$CONDA_DEFAULT_ENV" ]
        echo -ns (__bobthefish_basename "$CONDA_DEFAULT_ENV") ' '
    end
end

function __bobthefish_prompt_virtualgo -S -d 'Display current Go virtual environment'
    [ "$theme_display_virtualgo" = no -o -z "$VIRTUALGO" ]
    and return

    __bobthefish_start_segment $color_virtualgo
    echo -ns $go_glyph ' ' (__bobthefish_basename "$VIRTUALGO") ' '
    set_color normal
end

function __bobthefish_prompt_desk -S -d 'Display current desk environment'
    [ "$theme_display_desk" = no -o -z "$DESK_ENV" ]
    and return

    __bobthefish_start_segment $color_desk
    echo -ns $desk_glyph ' ' (string replace -r '\.fish$' '' (__bobthefish_basename "$DESK_ENV")) ' '
    set_color normal
end

function __bobthefish_prompt_find_file_up -S -d 'Find file(s), going up the parent directories'
    set -l dir "$argv[1]"
    set -l files $argv[2..-1]

    if test -z "$dir"
        or test -z "$files"
        return 1
    end

    while [ "$dir" ]
        for f in $files
            if [ -e "$dir/$f" ]
                return
            end
        end

        [ "$dir" = / ]
        and return 1

        set dir (__bobthefish_dirname "$dir")
    end
    return 1
end

function __bobthefish_prompt_node -S -d 'Display current node version'
    set -l should_show

    if [ "$theme_display_node" = always -o "$theme_display_nvm" = yes ]
        set should_show 1
    else if [ "$theme_display_node" = yes ]
        __bobthefish_prompt_find_file_up "$PWD" package.json .nvmrc .node-version
        and set should_show 1
    end

    [ -z "$should_show" ]
    and return

    set -l node_manager
    set -l node_manager_dir

    if type -q nvm
        set node_manager nvm
        set node_manager_dir $NVM_DIR
    else if command -q fnm
        set node_manager fnm
        set node_manager_dir $FNM_DIR
    end

    [ -n "$node_manager_dir" ]
    or return

    set -l node_version ("$node_manager" current 2> /dev/null)

    [ -z $node_version -o "$node_version" = none -o "$node_version" = system ]
    and return

    [ -n "$color_nvm" ]
    and set -x color_node $color_nvm

    __bobthefish_start_segment $color_node
    echo -ns $node_glyph $node_version ' '
    set_color normal
end

function __bobthefish_prompt_nix -S -d 'Display current nix environment'
    [ "$theme_display_nix" = no -o -z "$IN_NIX_SHELL" ]
    and return

    __bobthefish_start_segment $color_nix
    echo -ns $nix_glyph $IN_NIX_SHELL ' '

    set_color normal
end

# ==============================
# VCS segments
# ==============================

function __bobthefish_prompt_fossil -S -a fossil_root_dir -a real_pwd -d 'Display the actual fossil state'
    set -f fossil_statuses (command fossil changes --differ 2>/dev/null | string replace --filter -r '^(\S+).*' '$1')

    # Fossil doesn't really stage changes; untracked files are ignored, tracked files are committed by default
    # It also syncs by default when you commit, and monitors for conflicts (which will be reported here)
    for line in $fossil_statuses
        switch $line
            case ADDED UPDATED EDITED DELETED RENAMED
                # These can really just all be dirty, then
                set -f dirty $git_dirty_glyph
            case EXTRA
                set -f new $git_untracked_glyph
            case CONFLICT
                set -f conflict '!'
        end
    end

    set -f flags "$dirty$new$conflict"

    [ "$flags" ]
    and set flags " $flags"

    set -l flag_colors $color_repo
    if [ "$dirty" ]
        set flag_colors $color_repo_dirty
    end

    __bobthefish_path_segment $fossil_root_dir project

    __bobthefish_start_segment $flag_colors
    echo -ns $fossil_glyph ' '

    echo -ns (__bobthefish_fossil_branch) $flags ' '
    set_color normal

    set -l project_pwd (__bobthefish_project_pwd $fossil_root_dir $real_pwd)
    if [ "$project_pwd" ]
        if [ -w "$real_pwd" ]
            __bobthefish_start_segment $color_path
        else
            __bobthefish_start_segment $color_path_nowrite
        end

        echo -ns $project_pwd ' '
    end
end

function __bobthefish_prompt_hg -S -a hg_root_dir -a real_pwd -d 'Display the actual hg state'
    set -l dirty (command hg stat; or echo -n '*')

    set -l flags "$dirty"
    [ "$flags" ]
    and set flags ''

    set -l flag_colors $color_repo
    if [ "$dirty" ]
        set flag_colors $color_repo_dirty
    end

    __bobthefish_path_segment $hg_root_dir project

    __bobthefish_start_segment $flag_colors
    echo -ns $hg_glyph ' '

    __bobthefish_start_segment $flag_colors
    echo -ns (__bobthefish_hg_branch) $flags ' '
    set_color normal

    set -l project_pwd (__bobthefish_project_pwd $hg_root_dir $real_pwd)
    if [ "$project_pwd" ]
        if [ -w "$real_pwd" ]
            __bobthefish_start_segment $color_path
        else
            __bobthefish_start_segment $color_path_nowrite
        end

        echo -ns $project_pwd ' '
    end
end

function __bobthefish_prompt_screen -S -d 'Display the screen name'
    [ "$theme_display_screen" = no -o -z "$STY" ]
    and return

    __bobthefish_start_segment $color_screen
    echo -ns (string split "." -- $STY)[2] ' '
    set_color normal
end

function __bobthefish_prompt_git -S -a git_root_dir -a real_pwd -a repaint -d 'Display the actual git state'
    if __bobthefish_git_async_enabled
        __bobthefish_prompt_git_async $git_root_dir $real_pwd $repaint
    else
        __bobthefish_prompt_git_sync $git_root_dir $real_pwd
    end
end

function __bobthefish_prompt_dir -S -a real_pwd -d 'Display a shortened form of the current directory'
    __bobthefish_path_segment "$real_pwd" pwd
end

# Polyfill for fish < 3.5.0
function __bobthefish_closest_parent -S
    if builtin -q path
        echo (path sort -r $argv)[1]
    else
        set -l closest
        for candidate in $argv
            [ -z "$candidate" ]
            and continue

            if [ -z "$closest" -o (string length -- "$candidate") -gt (string length -- "$closest") ]
                set closest $candidate
            end
        end
        echo $closest
    end
end

# ==============================
# Apply theme
# ==============================

function fish_prompt -d 'bobthefish, a fish theme optimized for awesome'
    # Save the last status for later (do this before anything else)
    set -l last_status $status
    set -l git_async_repaint
    set -e __bobthefish_git_async_repaint_pending
    and set git_async_repaint 1

    # Use a simple prompt on dumb terminals.
    if [ "$TERM" = dumb ]
        echo '> '
        return
    end

    __bobthefish_glyphs
    __bobthefish_colors $theme_color_scheme

    type -q bobthefish_colors
    and bobthefish_colors

    # Start each line with a blank slate
    set -l __bobthefish_current_bg

    set -l real_pwd (__bobthefish_pwd)

    # Status flags and input mode
    __bobthefish_prompt_status $last_status

    # User / hostname info
    __bobthefish_prompt_user

    # Screen
    __bobthefish_prompt_screen

    # Containers and VMs
    __bobthefish_prompt_vagrant
    __bobthefish_prompt_docker
    __bobthefish_prompt_k8s_context

    # Cloud Tools
    __bobthefish_prompt_aws_vault_profile

    # Virtual environments
    __bobthefish_prompt_nix
    __bobthefish_prompt_desk
    __bobthefish_prompt_rubies
    __bobthefish_prompt_golang $real_pwd
    __bobthefish_prompt_virtualfish
    __bobthefish_prompt_virtualgo
    __bobthefish_prompt_node

    # VCS
    set -l git_root_dir (__bobthefish_git_project_dir $real_pwd)
    set -l hg_root_dir (__bobthefish_hg_project_dir $real_pwd)
    set -l fossil_root_dir (__bobthefish_fossil_project_dir $real_pwd)

    # only show the closest parent
    switch (__bobthefish_closest_parent "$git_root_dir" "$hg_root_dir" "$fossil_root_dir")
        case ''
            __bobthefish_prompt_dir $real_pwd
        case "$git_root_dir"
            __bobthefish_prompt_git $git_root_dir $real_pwd $git_async_repaint
        case "$hg_root_dir"
            __bobthefish_prompt_hg $hg_root_dir $real_pwd
        case "$fossil_root_dir"
            __bobthefish_prompt_fossil $fossil_root_dir $real_pwd
    end

    __bobthefish_finish_segments
end