Improve bash history handling

https://sanctum.geek.nz/arabesque/better-bash-history/

shell/bash/bashrc

@@ -58,6 +58,9 @@ source "$DOTFILES_PATH/shell/bash/prompt"
 # instead places them in the readline for editing
 shopt -s histverify
 
+# always _append_ to bash history
+shopt -s histappend
+
 # prevents some Java GUI apps from not working or rendering properly due to
 # using wacky window managers
 export _JAVA_AWT_WM_NONREPARENTING=1
@@ -81,8 +84,18 @@ export TERMINAL="urxvtc"
 
 export BROWSER="firefox-developer-edition"
 
-# unlimited history
+# "unlimited" history
-export HISTSIZE=""
+export HISTFILESIZE="10000000"
+export HISTSIZE="10000000"
+
+# ignore duplicates and commands starting with space (" ")
+export HISTCONTROL=ignoreboth
+
+# ignore certain commands
+HISTIGNORE='ls:ll:la'
+
+# ensure command history is comprised of single lines
+shopt -s cmdhist
 
 # load a per-device config last so anything can be overridden
 if [ -a "$HOME/.env_bashrc" ]; then

shell/bash/prompt

@@ -27,6 +27,8 @@ export -f "preprocess_pwd"
 
 prompt_command_func()
 {
+	# commit history to prevent data loss from edge cases
+	history -a
 	RET=$?
 	# set the color of the user and host based on the result of the previous
 	# command