Adding some Go bits, correcting some warts

plus getting to the bottom of shell startup slowness, which appears to
be almost entirely due to rbenv.

bash_aliases

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 alias .bp="source $HOME/.bash_profile"
 alias .sa="source $HOME/.ssh/agent.out"
 alias be='bundle exec'
@@ -15,12 +17,13 @@ alias sS='TERM=xterm screen -Rd -S '
 alias scr='TERM=xterm screen -Rd'
 alias sl="screen -ls"
 
-if [[ "$(uname)" -eq "Linux" ]]
-then
-    alias l='ls -F --color=auto'
-else
-    # for darwin in particular
+case "$(uname | tr '[:upper:]' '[:lower:]')" in
+    darwin)
         alias l='ls -GF'
-fi
+        ;;
+    *)
+        alias l='ls -F --color=auto'
+        ;;
+esac
 
 # vim:filetype=sh

bash_profile

@@ -5,7 +5,7 @@ _debug(){
 }
 
 
-_get_hostname(){
+_get_hostname() {
     local hn="$(hostname -a 2>/dev/null || hostname)"
     local ha=""
     for host in $hn ; do
@@ -21,7 +21,7 @@ _get_hostname(){
 }
 
 
-_source_host_specific_rcfile(){
+_source_host_specific_rcfile() {
     local _host_alias="`_get_hostname`"
     if [[ ! -n "$_host_alias" ]] ; then
         _host_alias="`hostname`"
@@ -35,9 +35,20 @@ _source_host_specific_rcfile(){
 }
 
 
-_source_bash_extras()
-{
-    local _BASH_EXTRAS="
+_source_if_exists() {
+    if [ -e "$1" ] ; then
+        _debug "sourcing $1"
+        if [ -n "$DEBUG" ] ; then
+            time source "$1"
+        else
+            source "$1"
+        fi
+    fi
+}
+
+
+_source_bash_extras() {
+    local _bash_extras="
         $HOME/.bashrc_local
         $HOME/.bash_aliases
         $HOME/.bash_functions
@@ -45,25 +56,31 @@ _source_bash_extras()
         $HOME/.bash_completion
         $HOME/.autoenv/activate.sh
     "
-    for ext in $_BASH_EXTRAS ; do
-        if [ -e "$ext" ] ; then
-            _debug "sourcing $ext"
-            source $ext
-        fi
+    for ext in $_bash_extras ; do
+        _source_if_exists "$ext"
     done
 }
 
 
-_bash_profile_main()
-{
+_bash_profile_main() {
     source "$HOME/.bash_vars_common"
     _source_host_specific_rcfile
     _source_bash_extras
+
     get_ssh_agent
     get_gpg_agent
 
+    if [ -n "$DEBUG" ] ; then
+        export RBENV_DEBUG=1
+        time eval "$(rbenv init -)"
+        unset RBENV_DEBUG
+    else
         eval "$(rbenv init -)"
-    test -f "$HOME/.gvm/scripts/gvm" && source "$HOME/.gvm/scripts/gvm"
+    fi
+
+    _source_if_exists "$HOME/.gvm/scripts/gvm"
+    _source_if_exists "$HOME/.gvmrc"
+    _source_if_exists "$HOME/src/gocode/src/.env"
 
     unset _get_hostname
     unset _source_host_specific_rcfile