# Functions behind the Das OS bash prompt (see dprompt). Sourced by
# /etc/bash/bashrc.d/das-prompt.sh and by the prompt.sh files dprompt writes.
# shellcheck shell=bash

# Colors when the terminal has at least 8 of them
__das_has_color() {
	case $TERM in
	*color* | xterm* | rxvt* | screen* | tmux* | linux | alacritty | foot* | kitty*) return 0 ;;
	esac
	[[ $(tput colors 2>/dev/null) -ge 8 ]]
}

# Sets __das_git to the branch (or short commit) and "*" when there are changes
__das_git_info() {
	command -v git >/dev/null || return 1
	local branch
	branch=$(git symbolic-ref --short -q HEAD 2>/dev/null || git rev-parse --short -q HEAD 2>/dev/null) || return 1
	[[ -n $branch ]] || return 1
	if [[ -n $(git status --porcelain -uno 2>/dev/null | head -c1) ]]; then
		branch+="*"
	fi
	__das_git=$branch
}

# Sets __das_jobs to the number of background jobs; fails when there are none
__das_jobs_count() {
	local count='\j'
	__das_jobs=${count@P}
	((__das_jobs > 0))
}

# Runs first in PROMPT_COMMAND: keeps the exit status for the prompt and fills
# the variables of its conditional parts
__das_prompt_hook() {
	__das_rc=$?
	# Void's /etc/skel/.bashrc sets its own PS1 after /etc/bash/bashrc.d: put
	# the Das OS one back, once, unless the user has a PS1 of their own
	if [[ -n ${__das_ps1+set} ]]; then
		[[ $PS1 == '[\u@\h \W]\$ ' ]] && PS1=$__das_ps1
		unset __das_ps1
	fi
	declare -F __das_prompt_dynamic >/dev/null && __das_prompt_dynamic
	return "$__das_rc"
}

__das_prompt_install() {
	__das_ps1=$PS1
	local cmd
	for cmd in "${PROMPT_COMMAND[@]}"; do
		[[ $cmd == __das_prompt_hook ]] && return 0
	done
	PROMPT_COMMAND=(__das_prompt_hook "${PROMPT_COMMAND[@]}")
}