136 lines
4.2 KiB
Bash
136 lines
4.2 KiB
Bash
# ===== setopts and misc
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# only show RPROMPT on the current prompt
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setopt transient_rprompt # only show the rprompt on the current prompt
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# ===== set the prompt
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zshrc_prompt_precmd() {
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# regex to remove all zerospace elements. Used to calculate the width of
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# the top prompt.
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local zero='%([BSUBfksu]|([FB]|){*})'
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# linedrawing characters
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local top_left_corner="╭"
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local top_right_corner="╮"
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local bottom_left_corner="╰"
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local bottom_right_corner="╯"
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local dash="─"
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# check $TERM and use non unicode symbols if necessary
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if [[ $TERM == "linux" ]]; then
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top_left_corner="+"
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top_right_corner="+"
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bottom_left_corner="+"
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bottom_right_corner="+"
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dash="-"
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fi
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# commonly used design elements
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local bracket_open="%F{blue}${dash}(%f"
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local bracket_close="%F{blue}%)${dash}%f"
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local separator="%F{cyan}${dash}%f"
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# current directory, truncated if necessary (WIDTH is replaced later)
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local directory="%F{magenta}%WIDTH<..<%~%<<%f"
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# current time (HH:MM)
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local time="%F{yellow}%D{%H:%M}%f"
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# username, green for normal users, red for root
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local user="%(!.%F{red}.%F{green})%n%f"
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# hostname, underlined if running on a remote system through SSH
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local host="%F{green}%m%f"
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if [[ -n $SSH_CONNECTION ]]; then
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host="%U${host}%u"
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fi
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# exitcode in parentheses if not zero
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local exitcode="%(?..[%F{red}%?%f])"
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# prompt symbol, $ in cyan for normal users, # in red for root
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local symbol="%(!.%F{red}#%f.%F{cyan}>%f)"
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# battery percentage, if acpi is available
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local battery_pct=
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if [[ -d /sys/class/power_supply/BAT*(#qN) ]] && type acpi &> /dev/null; then
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battery_pct="$(acpi -b | cut -d, -f2 | sed -e 's/[^0-9]//g')"
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# colorize battery percentage or display status
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if [[ $battery_pct -le 20 ]]; then
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battery_pct="%F{red}${battery_pct}%%%f"
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elif [[ $battery_pct -le 65 ]]; then
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battery_pct="%F{yellow}${battery_pct}%%%f"
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else
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battery_pct="%F{green}${battery_pct}%%%f"
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fi
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if [[ $(acpi -a | cut -d':' -f2) == " on-line" ]]; then
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battery_pct="%F{yellow}⌁%f${battery_pct}%F{yellow}⌁%f"
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fi
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fi
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# prefix characters in first and second line
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local top_prefix="%F{cyan}${top_left_corner}%f"
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local bottom_prefix="%F{cyan}${bottom_left_corner}%f"
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# suffix characters in first and second line
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local top_suffix="%F{cyan}${top_right_corner}%f"
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local bottom_suffix="%F{cyan}${bottom_right_corner}%f"
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# use %{ .. %} for bottom_right_corner to remove useless space after RPROMPT
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# remove useless space after RPROMPT
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if [[ $TERM != "tmux-256color" ]]; then
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# use %{ .. %} for bottom_right_corner if not in tmux
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bottom_suffix="%{${bottom_suffix}%}"
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else
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ZLE_RPROMPT_INDENT=0
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fi
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# combine them to create the prompt
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local top_left=""
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local top_right="${bracket_open}${time}${bracket_close}"
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local bottom_left="${bracket_open}${user}%F{green}@%f${host}${bracket_close}${exitcode}${separator}${symbol}"
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local bottom_right=
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# if $battery_pct is empty, just add a vertical line
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if [[ -n $battery_pct ]]; then
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bottom_right="${separator}${bracket_open}${battery_pct}${bracket_close}"
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else
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bottom_right="%F{blue}${dash}%f"
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fi
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# calculate width of prompt components
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local width_top_prefix=${#${(S%%%)top_prefix//$~zero/}}
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local width_top_suffix=${#${(S%%%)top_suffix//$~zero/}}
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local width_top_left=${#${(S%%%)top_left//$~zero/}}
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local width_top_right=${#${(S%%%)top_right//$~zero/}}
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# calculate the maximum width of ${top_left}:
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# (-4 for brackets, -1 as spacing between top_left and top_right)
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local top_left_width_max=$((
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COLUMNS - $width_top_prefix
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- $width_top_left - 4
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- 1
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- $width_top_right
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- $width_top_suffix
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))
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# truncated directory if necessary
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top_left="${bracket_open}${directory/WIDTH/${top_left_width_max}}${bracket_close}${top_left}"
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width_top_left=${#${(S%%)top_left//$~zero/}}
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# calculate the width of the top prompt to fill the middle with separators
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local width=$((
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COLUMNS - width_top_prefix
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- width_top_left
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- width_top_right
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- width_top_suffix
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))
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local top_separator="%F{cyan}${(pl:${width}::$dash:)}%f"
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PROMPT="${top_prefix}${top_left}${top_separator}${top_right}${top_suffix}
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${bottom_prefix}${bottom_left} "
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RPROMPT="${bottom_right}${bottom_suffix}"
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}
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precmd_functions+=(zshrc_prompt_precmd)
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