update `.bashrc`

bashrc

@@ -1,39 +1,18 @@
-# check interactive
-case $- in
-*i*) ;;
-*) return ;;
-esac
+# ~/.bashrc
+
+# if not running interactively, don't do anything
+[ -z "$PS1" ] && return
+
+# check the window size after each command and, if necessary,
+# update the values of LINES and COLUMNS.
+shopt -s checkwinsize
 
 # history
 shopt -s histappend
-HISTCONTROL=ignoreboth
-HISTSIZE=1000
-HISTFILESIZE=2000
+PROMPT_COMMAND="history -a"
 
-# prompt
-r="\[\e[00m\]"
-b="\[\e[01m\]"
-c4="\[\e[34m\]"
-c7="\[\e[37m\]"
-
-PS1="${b}\u@\h:$c4\w$c7\$$r "
-
-unset e r b c4 c5 c7
-
-# title
-PS1="\[\e]0;\u@\h: \w\a\]$PS1"
-
-# functions
-# stat
-st() {
-	find "${1-.}" -maxdepth 1 -printf '%m %u %g %y %P\n' |
-		sort -V -k 4,5 | column -t -N 'i,u,g,t,n' -l 5 -R 'i,u' -d
-}
-
-# color
-case "$TERM" in
-	foot) export TERMCOLOR=truecolor;;
-esac
+# set the title to user@host:dir
+PS1="\[\e]0;\u@\h:\w\a\]$PS1"
 
 # aliases
 # exit
@@ -48,9 +27,9 @@ alias ls="ls --color"
 alias ll="ls -AFv1 --group-directories-first"
 
 # nvim
-alias :e="$EDITOR"
+alias :e="nvim"
 
-# bash completion
+# enable bash completion in interactive shells
 if ! shopt -oq posix; then
 	if [ -f /usr/share/bash-completion/bash_completion ]; then
 		. /usr/share/bash-completion/bash_completion
@@ -58,20 +37,3 @@ if ! shopt -oq posix; then
 		. /etc/bash_completion
 	fi
 fi
-
-# osc 7
-osc7_cwd() {
-	local strlen=${#PWD}
-	local encoded=""
-	local pos c o
-	for ((pos = 0; pos < strlen; pos++)); do
-		c=${PWD:$pos:1}
-		case "$c" in
-		[-/:_.!\'\(\)~[:alnum:]]) o="${c}" ;;
-		*) printf -v o '%%%02X' "'${c}" ;;
-		esac
-		encoded+="${o}"
-	done
-	printf '\e]7;file://%s%s\e\\' "${HOSTNAME}" "${encoded}"
-}
-PROMPT_COMMAND=${PROMPT_COMMAND:+$PROMPT_COMMAND; }osc7_cwd