364 lines
9.2 KiB
Bash
Executable File
364 lines
9.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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# _____ _ _
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# | __|___ ___ ___ _| |___ _____| |_ ___ ___ ___
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# | __| _| -_| -_| . | . | | . | . | | -_|
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# |__| |_| |___|___|___|___|_|_|_|___|___|_|_|___|
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#
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# Freedom in the Cloud
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# Based on https://github.com/undu/bash-powerline
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__powerline() {
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# User config variables,
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# it's recommended to override those variables through .bashrc or similar
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#
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# Use powerline mode
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# readonly POWERLINE_FONT=''
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#
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# Always show user in the prompt
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# readonly SHOW_USER=''
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#
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# Never show a default user
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# readonly DEFAULT_USER='user'
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# Default background and foreground ANSI colours
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readonly DEFAULT_BG=0
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readonly DEFAULT_FG=7
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# Max length of full path
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readonly MAX_PATH_LENGTH=30
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# Unicode symbols
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if [ -z "${POWERLINE_FONT+x}" ]; then
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readonly GIT_BRANCH_SYMBOL=''
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else
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readonly GIT_BRANCH_SYMBOL=''
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fi
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readonly GIT_BRANCH_CHANGED_SYMBOL=''
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readonly GIT_NEED_PUSH_SYMBOL=''
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readonly GIT_NEED_PULL_SYMBOL=''
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# Powerline symbols
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readonly BLOCK_START=''
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# ANSI Colours
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readonly BLACK=0
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readonly RED=1
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readonly GREEN=2
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readonly YELLOW=3
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readonly BLUE=4
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readonly MAGENTA=5
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readonly CYAN=6
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readonly WHITE=7
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readonly BLACK_BRIGHT=8
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readonly RED_BRIGHT=9
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readonly GREEN_BRIGHT=10
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readonly YELLOW_BRIGHT=11
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readonly BLUE_BRIGHT=12
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readonly MAGENTA_BRIGHT=13
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readonly CYAN_BRIGHT=14
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readonly WHITE_BRIGHT=15
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# Font effects
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readonly DIM="\\[$(tput dim)\\]"
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readonly REVERSE="\\[$(tput rev)\\]"
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readonly RESET="\\[$(tput sgr0)\\]"
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readonly BOLD="\\[$(tput bold)\\]"
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# Generate terminal colour codes
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# $1 is an int (a colour) and $2 must be 'fg' or 'bg'
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__colour() {
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case "$2" in
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'fg'*)
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echo "\\[$(tput setaf "$1")\\]"
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;;
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'bg'*)
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echo "\\[$(tput setab "$1")\\]"
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;;
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*)
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echo "\\[$(tput setab "$1")\\]"
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;;
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esac
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}
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# Generate a single-coloured block for the prompt
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__prompt_block() {
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local bg; local fg
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if [ ! -z "${1+x}" ]; then
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bg=$1
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else
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if [ ! -z "$last_bg" ]; then
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bg=$last_bg
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else
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bg=$DEFAULT_BG
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fi
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fi
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if [ ! -z "${2+x}" ]; then
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fg=$2
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else
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fg=$DEFAULT_FG
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fi
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local block
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# Need to generate a separator if the background changes
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if [[ ! -z "$last_bg" && "$bg" != "$last_bg" && ! -z "${POWERLINE_FONT+x}" ]]; then
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block+="$(__colour "$bg" 'bg')"
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block+="$(__colour "$last_bg" 'fg')"
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block+="$BLOCK_START $RESET"
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block+="$(__colour "$bg" 'bg')"
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block+="$(__colour "$fg" 'fg')"
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else
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block+="$(__colour "$bg" 'bg')"
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block+="$(__colour "$fg" 'fg')"
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block+=" "
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fi
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if [ ! -z "${3+x}" ]; then
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block+="$3 $RESET"
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fi
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last_bg=$bg
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__block_text="$block"
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}
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function __end_block() {
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__block_text=''
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if [ ! -z "$last_bg" ]; then
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if [ ! -z "${POWERLINE_FONT+x}" ]; then
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__block_text+="$(__colour $DEFAULT_BG 'bg')"
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__block_text+="$(__colour "$last_bg" 'fg')"
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__block_text+="$BLOCK_START$RESET"
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__block_text+="$(__colour $DEFAULT_BG 'bg')"
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__block_text+="$(__colour "$DEFAULT_FG" 'fg')"
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else
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__block_text+="$(__colour $DEFAULT_BG 'bg')"
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__block_text+="$(__colour "$DEFAULT_FG" 'fg')"
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fi
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fi
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__block_text+=' '
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}
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### Prompt components
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__git_block() {
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if ! command -V git > /dev/null; then
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# git not found
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__block_text=''
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return
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fi
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# force git output in English to make our work easier
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local git_eng="env LANG=C git"
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# check if pwd is under git
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if ! git rev-parse --is-inside-git-dir > /dev/null 2> /dev/null; then
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# not in a git repo, bail out
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__block_text=''
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return
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fi
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# get current branch name or short SHA1 hash for detached head
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local branch; local ref_symbol
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branch="$($git_eng symbolic-ref --short HEAD 2>/dev/null)"
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# shellcheck disable=SC2181
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if [ $? != 0 ]; then
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branch="$($git_eng describe --tags --always 2>/dev/null)"
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ref_symbol=''
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else
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ref_symbol=$GIT_BRANCH_SYMBOL
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fi
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# In pcmode (and only pcmode) the contents of
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# $gitstring are subject to expansion by the shell.
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# Avoid putting the raw ref name in the prompt to
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# protect the user from arbitrary code execution via
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# specially crafted ref names (e.g., a ref named
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# '$(IFS=_;cmd=sudo_rm_-rf_/;$cmd)' would execute
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# 'sudo rm -rf /' when the prompt is drawn). Instead,
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# put the ref name in a new global variable (in the
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# __git_ps1_* namespace to avoid colliding with the
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# user's environment) and reference that variable from
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# PS1.
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# note that the $ is escaped -- the variable will be
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# expanded later (when it's time to draw the prompt)
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if shopt -q promptvars; then
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export __git_ps1_block="$branch"
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ref="$ref_symbol \${__git_ps1_block}"
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else
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ref="$ref_symbol $branch"
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fi
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local marks
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# check if HEAD is dirty
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if [ -n "$($git_eng status --porcelain 2>/dev/null)" ]; then
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dirty='y'
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marks+=" $GIT_BRANCH_CHANGED_SYMBOL"
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fi
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# how many commits local branch is ahead/behind of remote?
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local stat; local aheadN; local behindN
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stat="$($git_eng status --porcelain --branch 2>/dev/null | grep '^##' | grep -o '\[.\+\]$')"
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aheadN="$(echo "$stat" | grep -o 'ahead [[:digit:]]\+' | grep -o '[[:digit:]]\+')"
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behindN="$(echo "$stat" | grep -o 'behind [[:digit:]]\+' | grep -o '[[:digit:]]\+')"
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[ -n "$aheadN" ] && marks+=" $GIT_NEED_PUSH_SYMBOL$aheadN"
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[ -n "$behindN" ] && marks+=" $GIT_NEED_PULL_SYMBOL$behindN"
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local bg; local fg
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fg=$BLACK
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if [ -z "$dirty" ]; then
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bg=$GREEN
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else
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bg=$YELLOW
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fi
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__prompt_block $bg $fg "$ref$marks"
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}
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__virtualenv_block() {
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# Copied from Python virtualenv's activate.sh script.
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# https://github.com/pypa/virtualenv/blob/a9b4e673559a5beb24bac1a8fb81446dd84ec6ed/virtualenv_embedded/activate.sh#L62
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# License: MIT
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if [ -n "$VIRTUAL_ENV" ]; then
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local venv
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# In pcmode (and only pcmode) the contents of
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# $gitstring are subject to expansion by the shell.
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# Avoid putting the raw ref name in the prompt to
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# protect the user from arbitrary code execution via
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# specially crafted ref names (e.g., a ref named
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# '$(IFS=_;cmd=sudo_rm_-rf_/;$cmd)' would execute
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# 'sudo rm -rf /' when the prompt is drawn). Instead,
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# put the ref name in a new global variable (in the
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# __git_ps1_* namespace to avoid colliding with the
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# user's environment) and reference that variable from
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# PS1.
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# note that the $ is escaped -- the variable will be
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# expanded later (when it's time to draw the prompt)
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if shopt -q promptvars; then
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export __venv_ps1_block
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__venv_ps1_block=$(basename "$VIRTUAL_ENV")
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venv="$ref_symbol \${__venv_ps1_block}"
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else
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venv="$(basename "$VIRTUAL_ENV")"
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fi
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__prompt_block $WHITE $BLACK "$venv"
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else
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__block_text=''
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fi
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}
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__pwd_block() {
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# Use ~ to represent $HOME prefix
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local pwd; pwd=$(pwd | sed -e "s|^$HOME|~|")
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# shellcheck disable=SC1001,SC2088
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if [[ ( $pwd = ~\/*\/* || $pwd = \/*\/*/* ) && ${#pwd} -gt $MAX_PATH_LENGTH ]]; then
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local IFS='/'
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read -ra split <<< "$pwd"
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if [[ $pwd = ~* ]]; then
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pwd="~/${split[1]}/.../${split[*]:(-2):1}/${split[*]:(-1)}"
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else
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pwd="/${split[1]}/.../${split[*]:(-2):1}/${split[*]:(-1)}"
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fi
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fi
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__prompt_block $BLACK_BRIGHT $WHITE_BRIGHT "$pwd"
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}
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# superuser or not, here I go!
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__user_block() {
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# Colours to use
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local fg=$WHITE_BRIGHT
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local bg=$BLUE
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if [[ ! -z "$SSH_CLIENT" ]]; then
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local show_host="y"
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bg=$CYAN
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fi
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if [ -z "$(id -u "$USER")" ]; then
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bg=$RED
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fi
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# shellcheck disable=SC2153
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if [[ ! -z "${SHOW_USER+x}" || ( ! -z "${DEFAULT_USER+x}" && "$DEFAULT_USER" != "$(whoami)" ) ]]; then
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local show_user="y"
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fi
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local text
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if [ ! -z ${show_user+x} ]; then
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text+="$BOLD$(whoami)"
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fi
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if [ ! -z ${show_host+x} ]; then
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if [ ! -z "${text+x}" ]; then
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text+="@"
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fi
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text+="\\h"
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fi
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if [ ! -z ${text+x} ]; then
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__prompt_block $bg $fg $text
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fi
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}
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__status_block() {
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local text
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if [ "$exit_code" != 0 ]; then
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__prompt_block $BLACK $RED ''
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text+=$__block_text
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fi
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if [ "$(id -u "$USER")" == 0 ]; then
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__prompt_block $BLACK $YELLOW ''
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text+=$__block_text
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fi
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if [ "$(jobs -l | wc -l)" != 0 ]; then
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__prompt_block $BLACK $CYAN ''
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text+=$__block_text
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fi
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if [ ! -z "$text" ]; then
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__block_text=$text
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else
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__block_text=''
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fi
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}
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# Build the prompt
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prompt() {
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# I don't like bash; execute first to capture correct status code
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local exit_code=$?
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# shellcheck disable=SC2091
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$(history -a ; history -n)
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last_bg=''
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PS1=''
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__status_block
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PS1+=$__block_text
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__virtualenv_block
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PS1+=$__block_text
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__user_block
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PS1+=$__block_text
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__pwd_block
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PS1+=$__block_text
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__git_block
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PS1+=$__block_text
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__end_block
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PS1+=$__block_text
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}
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PROMPT_COMMAND=prompt
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}
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__powerline
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unset __powerline
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