dotfiles/zsh/prompt.zsh

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#!/usr/bin/env zsh
# Escapes `%` in all arguments by replacing it with `%%`. Escaping is needed so
# that untrusted input (e.g. git branch names) doesn't affect prompt rendering.
prompt_escape() {
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print -n "${@//\%/%%}"
}
prompt_preexec_hook() {
# record command start time
# $EPOCHREALTIME returns a float representing system time in seconds (see
# docs for zsh/datetime module) and is much faster than `date +%s.%N` because
# it doesn't involve starting a process
typeset -gF _PROMPT_EXEC_START_TIME="$EPOCHREALTIME"
}
prompt_precmd_hook() {
if [[ -v _PROMPT_EXEC_START_TIME ]]; then
local -F duration="$((EPOCHREALTIME - _PROMPT_EXEC_START_TIME))"
unset _PROMPT_EXEC_START_TIME
if (( duration > 1 )); then
local -i t="$duration" d h m s
typeset -g _PROMPT_EXEC_TIME=""
d="$((t/60/60/24))"
h="$((t/60/60%24))"
m="$((t/60%60))"
s="$((t%60))"
(( d > 0 )) && _PROMPT_EXEC_TIME+="${d}d"
(( h > 0 )) && _PROMPT_EXEC_TIME+="${h}h"
(( m > 0 )) && _PROMPT_EXEC_TIME+="${m}m"
_PROMPT_EXEC_TIME+="${s}s"
else
unset _PROMPT_EXEC_TIME
fi
fi
}
prompt_vcs_info() {
if [[ "$(command git rev-parse --is-inside-work-tree)" != true ]]; then
return
fi
local branch="(no branches)" line
git branch | while IFS= read -r line; do
# find a line which starts with `* `, it contains the current branch name
if [[ "$line" == "* "* ]]; then
# remove the `* ` prefix
branch="${line#\* }"
break
fi
done
print -n ' %F{blue}git:%F{magenta}'"$(prompt_escape "$branch")"'%F{blue}%f'
}
# configure prompt expansion
# nopromptbang
# `!` should not be treated specially, use `%!` instead.
# promptcr and promptsp
# print a character (`%` for normal users, `#` for root) and a newline in
# order to preserve output that may be covered by the prompt. See
# zshoptions(1) for more details.
# promptpercent
# enable normal prompt expansion sequences which begin with a `%`.
# promptsubst
# enable parameter/command/arithmetic expansion/substitution in the prompt.
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setopt no_prompt_bang prompt_cr prompt_sp prompt_percent prompt_subst
zmodload zsh/datetime
autoload -Uz add-zsh-hook
add-zsh-hook preexec prompt_preexec_hook
add-zsh-hook precmd prompt_precmd_hook
# Construct the prompt. See EXPANSION OF PROMPT SEQUENCES in zshmisc(1) for
# the list and descriptions of the expansion sequences.
# Start the prompt with gray (ANSI color 8 is "bright black" or "gray")
# box drawing characters, also enable bold font for the rest of it. This
# makes the prompt easily distinguishable from command output.
PROMPT='%F{8}┌─%f%B'
# username
PROMPT+='%F{%(!.red.yellow)}%n%f'
# hostname
PROMPT+=' at %F{'
if [[ -v SSH_CONNECTION ]]; then
PROMPT+='blue'
else
PROMPT+='green'
fi
PROMPT+='}%m%f'
# working directory
PROMPT+=' in %F{cyan}%~%f'
# VCS info
PROMPT+='$(prompt_vcs_info 2>/dev/null)'
PROMPT+=' '
# command execution time
PROMPT+='${_PROMPT_EXEC_TIME:+" %F{yellow}$(prompt_escape "$_PROMPT_EXEC_TIME")%f"}'
# exit code of the previous command
PROMPT+='%(?.. %F{red}EXIT:%?%f)'
# number of currently running background jobs
PROMPT+='%1(j. %F{blue}JOBS:%j%f.)'
# A while ago I decided to start using a multiline prompt because:
# a) all commands I type are visually aligned
# b) I can type pretty long commands without text wrapping in small terminal
# windows (e.g. in Termux on my phone)
PROMPT+=$'\n'
# see prompt beginning
PROMPT+='%b%F{8}└─%f'
# the last character
PROMPT+='%F{%(?.green.red)}%(!.#.\$)%f '
# PROMPT2 is used when you type an unfinished command. Spaces are needed for
# alignment with normal PROMPT.
PROMPT2=' %_> '