dotfiles/config/shell/zshrc

#!/usr/bin/env zsh

#
# ZSH aliases and customizations
#

# TODO Learn `setopt extendedglob`
# TODO Add asdf (oh-my-zsh plugin is air, git clone is the way (aur package outdated))

# Approximate RGB colors by terminal colors
[[ "$COLORTERM" == (24bit|truecolor) || "${terminfo[colors]}" -eq '16777216' ]] || zmodload zsh/nearcolor

# Plugins
ADOTDIR=~/.cache/antigen
mkdir -p $ADOTDIR
typeset -a ANTIGEN_CHECK_FILES=(~/.config/shell/zshrc)

[ -f ~/.local/share/zsh/antigen.zsh ] || (mkdir -p ~/.local/share/zsh/ && curl -L git.io/antigen > ~/.local/share/zsh/antigen.zsh)
# TODO If the downloaded file is wrong then we're doomed
source ~/.local/share/zsh/antigen.zsh

# This is better to have them installed as system since we can use them as root
# pacman -S zsh-autosuggestions zsh-history-substring-search zsh-syntax-highlighting zsh-completions --needed
function plugin() {
    if [ -d "/usr/share/licenses/$2" ]
    then
        trysource "/usr/share/zsh/plugins/$2/$2.zsh"
        # It's ok if it fails
    else
        antigen bundle "$1/$2"
    fi
}
plugin zsh-users zsh-completions
plugin zsh-users zsh-syntax-highlighting
plugin zsh-users zsh-autosuggestions
plugin zsh-users zsh-history-substring-search
antigen apply

# Prompt customization
zmodload zsh/datetime

function preexec() {
    __TIMER=$EPOCHREALTIME
}

function powerline_precmd() {
    local __ERRCODE=$?
    local __DURATION=0

    if [ -n $__TIMER ]; then
        local __ERT=$EPOCHREALTIME
        __DURATION="$(($__ERT - ${__TIMER:-__ERT}))"
    fi

    echo -en "\033]; ${USER}@${HOST} $PWD\007"
    # echo -en "… $\r"
    eval "$(powerline-go -shell zsh -eval -duration $__DURATION -error $__ERRCODE "${POWERLINE_GO_DEFAULT_OPTS[@]}")"
    unset __TIMER
}

function install_powerline_precmd() {
    for s in "${precmd_functions[@]}"; do
        if [ "$s" = "powerline_precmd" ]; then
            return
        fi
    done
    precmd_functions+=(powerline_precmd)
}

install_powerline_precmd

# Cursor based on mode
if [ $TERM = "linux" ]; then
    _LINE_CURSOR="\e[?0c"
    _BLOCK_CURSOR="\e[?8c"
else
    _LINE_CURSOR="\e[6 q"
    _BLOCK_CURSOR="\e[2 q"
fi
function zle-keymap-select zle-line-init
{
    case $KEYMAP in
        vicmd)      print -n -- "$_BLOCK_CURSOR";;
        viins|main) print -n -- "$_LINE_CURSOR";;
    esac

    # zle reset-prompt
    # zle -R
}

function zle-line-finish
{
    print -n -- "$_BLOCK_CURSOR"
}

zle -N zle-line-init
zle -N zle-line-finish
zle -N zle-keymap-select

# Should I really put a comment to explain what this does?
bindkey 'jk' vi-cmd-mode

# Edit command line
autoload edit-command-line
zle -N edit-command-line
bindkey -M vicmd v edit-command-line

# History search
# bind UP and DOWN arrow keys
zmodload zsh/terminfo
bindkey "$terminfo[kcuu1]" history-substring-search-up
bindkey "$terminfo[kcud1]" history-substring-search-down

# bind UP and DOWN arrow keys (compatibility fallback
# for Ubuntu 12.04, Fedora 21, and MacOSX 10.9 users)
bindkey '^[[A' history-substring-search-up
bindkey '^[[B' history-substring-search-down

# bind P and N for EMACS mode
bindkey -M emacs '^P' history-substring-search-up
bindkey -M emacs '^N' history-substring-search-down

# bind k and j for VI mode
bindkey -M vicmd 'k' history-substring-search-up
bindkey -M vicmd 'j' history-substring-search-down

# Autocompletion
autoload -Uz promptinit
promptinit

# Color common prefix
zstyle -e ':completion:*:default' list-colors 'reply=("${PREFIX:+=(#bi)($PREFIX:t)(?)*==35=00}:${(s.:.)LS_COLORS}")'

setopt GLOBDOTS # Complete hidden files

setopt NO_BEEP # that annoying beep goes away
# setopt NO_LIST_BEEP # beeping is only turned off for ambiguous completions
setopt AUTO_LIST # when the completion is ambiguous you get a list without having to type ^D
# setopt BASH_AUTO_LIST # the list only happens the second time you hit tab on an ambiguous completion
# setopt LIST_AMBIGUOUS # this is modified so that nothing is listed if there is an unambiguous prefix or suffix to be inserted --- this can be combined with BASH_AUTO_LIST, so that where both are applicable you need to hit tab three times for a listing
unsetopt REC_EXACT # if the string on the command line exactly matches one of the possible completions, it is accepted, even if there is another completion (i.e. that string with something else added) that also matches
unsetopt MENU_COMPLETE # one completion is always inserted completely, then when you hit TAB it changes to the next, and so on until you get back to where you started
unsetopt AUTO_MENU # you only get the menu behaviour when you hit TAB again on the ambiguous completion.
unsetopt AUTO_REMOVE_SLASH

# Fuzzy matching all the way
# trysource /usr/share/fzf/completion.zsh
trysource /usr/share/fzf/key-bindings.zsh

# Help
# TODO Doesn't work (how ironic)
autoload -Uz run-help
unalias run-help
alias help=run-help
autoload -Uz run-help-git
autoload -Uz run-help-ip
autoload -Uz run-help-openssl
autoload -Uz run-help-p4
autoload -Uz run-help-sudo
autoload -Uz run-help-svk
autoload -Uz run-help-svn

# Dir stack
DIRSTACKFILE="$HOME/.cache/zsh/dirs"
if [[ -f $DIRSTACKFILE ]] && [[ $#dirstack -eq 0 ]]; then
  dirstack=( ${(f)"$(< $DIRSTACKFILE)"} )
  # [[ -d $dirstack[1] ]] && cd $dirstack[1]
fi
chpwd() {
  print -l $PWD ${(u)dirstack} >$DIRSTACKFILE
}

DIRSTACKSIZE=20

setopt AUTO_PUSHD PUSHD_SILENT PUSHD_TO_HOME
setopt PUSHD_IGNORE_DUPS # Remove duplicate entries
setopt PUSHD_MINUS # This reverts the +/- operators.


# Command not found
# (since we have syntax highlighting we are not forced to wait to see that we typed crap)
trysource /usr/share/doc/pkgfile/command-not-found.zsh

# History

# From https://unix.stackexchange.com/a/273863
SAVEHIST=$HISTSIZE
setopt BANG_HIST                 # Treat the '!' character specially during expansion.
unsetopt EXTENDED_HISTORY          # Write the history file in the ":start:elapsed;command" format.
setopt INC_APPEND_HISTORY        # Write to the history file immediately, not when the shell exits.
setopt SHARE_HISTORY             # Share history between all sessions.
setopt HIST_EXPIRE_DUPS_FIRST    # Expire duplicate entries first when trimming history.
setopt HIST_IGNORE_DUPS          # Don't record an entry that was just recorded again.
setopt HIST_IGNORE_ALL_DUPS      # Delete old recorded entry if new entry is a duplicate.
setopt HIST_FIND_NO_DUPS         # Do not display a line previously found.
setopt HIST_IGNORE_SPACE         # Don't record an entry starting with a space.
setopt HIST_SAVE_NO_DUPS         # Don't write duplicate entries in the history file.
setopt HIST_REDUCE_BLANKS        # Remove superfluous blanks before recording entry.
unsetopt HIST_VERIFY               # Don't execute immediately upon history expansion.
unsetopt HIST_BEEP                 # Beep when accessing nonexistent history.