dotfiles/zsh/rc

# vim: set ft=zsh nowrap:
# shellcheck disable=SC1090

_here="$(dirname -- "$(readlink -f -- "${HOME}/.zshrc")")"
_cache_dir="${XDG_CACHE_HOME:-"${HOME}/.cache"}/zsh"

if [[ ! -d ${_cache_dir} ]]; then
    mkdir -p "${_cache_dir}"
fi

###########
# Options #
###########
# Ref: https://zsh.sourceforge.io/Doc/Release/Options.html

setopt CORRECT
setopt INTERACTIVE_COMMENTS
unsetopt BEEP
unsetopt NOMATCH
unsetopt FLOW_CONTROL

# History
setopt BANG_HIST
setopt EXTENDED_HISTORY
setopt HIST_EXPIRE_DUPS_FIRST
setopt HIST_IGNORE_DUPS
setopt HIST_IGNORE_SPACE
setopt HIST_NO_STORE
setopt HIST_REDUCE_BLANKS
setopt HIST_VERIFY
setopt INC_APPEND_HISTORY_TIME

###########
# Vi mode #
###########

bindkey -v
export KEYTIMEOUT=1  # Reduce ESC delay to 10ms
bindkey -v '^?' backward-delete-char  # Make backspace work in vi insert mode
bindkey -v '^H' backward-delete-char  # Alternative backspace binding
bindkey -a '_' vi-first-non-blank

# Selection highlight
# shellcheck disable=SC2034
zle_highlight=(region:bg=#323641)

# Vi mode indicator in prompt
function zle-keymap-select {
    if [[ ${KEYMAP} == vicmd ]]; then
        VI_MODE_INDICATOR="%F{yellow}N%f"
    else
        VI_MODE_INDICATOR=""
    fi
    zle reset-prompt
}
zle -N zle-keymap-select

function zle-line-init {
    # shellcheck disable=SC2034
    VI_MODE_INDICATOR=""
    zle reset-prompt
}
zle -N zle-line-init

###################
# Shell Variables #
###################
# Ref: https://zsh.sourceforge.io/Doc/Release/Parameters.html

path=("${HOME}/.local/bin" "${HOME}/go/bin" "${HOME}/.cargo/bin" "${path[@]}")
export MAIL="/var/spool/mail/$USER"
export MAILCHECK=60
export HISTFILE="${HOME}/.zsh_history"
export HISTSIZE=100100
export SAVEHIST=100000
export LISTMAX=0

###################
# Other Variables #
###################

export VISUAL="nvim"
export EDITOR="nvim"
export DIFFPROG="nvim -d"
export NNN_TRASH=2
export NNN_PLUG=''
export MESA_WHICH_LLVM=1
export CC=gcc

#############
# LS_COLORS #
#############

_dircolors="${_here}/dircolors"
eval "$(dircolors -b "$_dircolors")"

unset _dircolors

##########
# Prompt #
##########

source "${_here}/prompt"

##############
# Completion #
##############

source "${_here}/completion"

###########
# Plugins #
###########

export ZSH_AUTOSUGGEST_STRATEGY=(history completion)
export ZSH_AUTOSUGGEST_MANUAL_REBIND=true

export ZSH_HIGHLIGHT_HIGHLIGHTERS=(main brackets)
typeset -A ZSH_HIGHLIGHT_STYLES
export ZSH_HIGHLIGHT_STYLES[path]='none'

_antidote="${_cache_dir}/antidote"
_plugins="${_here}/plugins"
_plugins_cache="${_cache_dir}/plugins"

if [[ ! -d $_antidote ]]; then
    git clone --depth=1 https://github.com/mattmc3/antidote.git "$_antidote"
fi

fpath=("${_antidote}/functions" "${fpath[@]}")
autoload -Uz antidote

if [[ ! ${_plugins_cache} -nt ${_plugins} ]]; then
    antidote bundle <"${_plugins}" >"${_plugins_cache}"
fi

source "${_plugins_cache}"

unset _antidote _plugins _plugins_cache

#############
# Functions #
#############
# Ref: https://zsh.sourceforge.io/Doc/Release/Functions.html#Functions

function set_terminal_title() {
    local title cwd host extra
    local -a parts

    extra="$1"

    parts=()
    if [ -n "$SSH_CONNECTION" ] && [ -z "$TMUX" ]; then
        local -a tmp
        tmp=("${=SSH_CONNECTION}")
        host=${tmp[3]}
        parts+=("$host")
    fi

    if [ "$PWD" = "$HOME" ]; then
        cwd="~"
    else
        cwd="${PWD##*/}"
    fi
    parts+=("$cwd")

    if [ -n "$extra" ]; then
        parts+=("$extra")
    fi

    # shellcheck disable=SC2296
    title="${(j|:|)parts}"

    echo -ne "\033]2;$title\033\\"
}

function preexec() {
    local cmd
    local -a parts

    parts=("${=1}")
    if [ "${parts[1]}" = "sudo" ]; then
        cmd="${parts[2]}"
    else
        cmd="${parts[1]}"
    fi

    set_terminal_title "$cmd"
}

function precmd() {
    set_terminal_title
}

function telnet_with_title() {
    local host port
    local skip_next="false"

    for arg in "$@"; do
        case "$arg" in
        --bind=*) ;&
        --escape=*) ;&
        --user=*) ;&
        --trace=*) ;&
        -[beln]?*)
            # Option with argument immediately after, like -blocalhost
            skip_next="false"
            ;;
        --bind) ;&
        --escape) ;&
        --user) ;&
        --trace) ;&
        -[beln])
            # Option with argument on next iteration
            skip_next="true"
            ;;
        -*)
            # Any other option, assumed not to take an argument
            skip_next="false"
            ;;
        *)
            if [ "$skip_next" = "true" ]; then
                skip_next="false"
            elif [ -z "$host" ]; then
                host="$arg"
            else
                port="$arg"
            fi
            ;;
        esac
    done

    echo -ne "\033]2;${host}:${port}\033\\"
    telnet "$@"
    set_terminal_title
}

function ssh_with_title() {
    local host=""
    local skip_next="false"

    for arg in "$@"; do
        case "$arg" in
        -[bcDeFIiLlmOopRSWw]?*)
            # Option with argument immediately after, like -p22
            skip_next="false"
            ;;
        -[bcDeFIiLlmOopRSWw])
            # Option with argument on next iteration
            skip_next="true"
            ;;
        -*)
            # Any other option, assumed not to take an argument
            skip_next="false"
            ;;
        *)
            if [ "$skip_next" = "true" ]; then
                skip_next="false"
            else
                host="${arg#*@}"
            fi
            ;;
        esac
    done

    echo -ne "\033]2;${host}\033\\"
    ssh "$@"
    set_terminal_title
}

###########
# Aliases #
###########

alias cp='cp -i'
alias ln='ln -fi'
alias ls='ls --color=auto --group-directories-first -vh'
alias grep='grep --color=auto'
alias mv='mv -i'
alias n='nnn -dHerU'
alias rm='rm -I'
alias ssh='ssh_with_title'
alias telnet='telnet_with_title'

###########
# Cleanup #
###########

unset _here _cache_dir