add "eternal" bash history, fix ssh-agents auth sock which was completely broken

bashrc

@@ -104,7 +104,7 @@ fi
 ssh_auth_link="${auth_sock_dir}/ssh_auth_sock"
 pgrep ssh-agent &>/dev/null
 if [[ "$?" == "1" ]]; then
-  eval "$(ssh-agent &>"$auth_sock_log")"
+  . <(ssh-agent | sed 's/echo/#echo/' | tee "$auth_sock_log")
   if [[ -L "$ssh_auth_link" ]]; then
     rm "$ssh_auth_link"
   fi
@@ -114,6 +114,25 @@ if [[ "$?" == "1" ]]; then
   else
     ln -s "$SSH_AUTH_SOCK" "$ssh_auth_link"
   fi
-else
-   [[ -L "${ssh_auth_link}" ]] && [[ -e "${ssh_auth_link}" ]] && export SSH_AUTH_SOCK="$ssh_auth_link"
 fi
+[[ -L "${ssh_auth_link}" ]] && [[ -e "${ssh_auth_link}" ]] && export SSH_AUTH_SOCK="$ssh_auth_link"
+
+# Eternal bash history.
+# ---------------------
+# Undocumented feature which sets the size to "unlimited".
+# http://stackoverflow.com/questions/9457233/unlimited-bash-history
+export HISTFILESIZE=
+export HISTSIZE=
+export HISTCONTROL=ignoredups:erasedups
+export HISTTIMEFORMAT="[%F %T] "
+shopt -s histappend
+
+# export HISTTIMEFORMAT="[%F %T] $(/home/luke/bin/history_status) "
+# Change the file location because certain bash sessions truncate .bash_history file upon close.
+# http://superuser.com/questions/575479/bash-history-truncated-to-500-lines-on-each-login
+export HISTFILE=~/.bash_eternal_history
+# Force prompt to write history after every command.
+# http://superuser.com/questions/20900/bash-history-loss
+# PROMPT_COMMAND="history -a; $PROMPT_COMMAND"
+# PROMPT_COMMAND="history -a; history -c; history -r; $PROMPT_COMMAND"
+export PROMPT_COMMAND="${PROMPT_COMMAND:+$PROMPT_COMMAND$'\n'}history -a; history -c; history -r"