shell: add and source plugins

Currently only zoxide

.config/shell/plugins

@@ -0,0 +1,15 @@
+#!/bin/sh
+# shell plugins for POSIX
+
+# Enable zoxide if it exists
+if command zoxide > /dev/null 2>&1 || ${SKIP_ZOXIDE:-false}; then
+   # Check what shell we're using based on variables that get set by non-posix shells - https://stackoverflow.com/a/3327022
+   if [ -n "${ZSH_NAME+set}" ]; then # zsh
+      eval "$(zoxide init zsh)"
+   elif [ -n "${BASH+set}" ]; then # bash
+      eval "$(zoxide init bash)"
+   else
+      # assume posix
+      eval "$(zoxide init posix --hook prompt)"
+   fi
+fi

.config/shell/shrc

@@ -82,6 +82,10 @@ ${SKIP_FUNCTIONS:-false} || fnupdate
 ### Options >>>
 set -o vi
 
+# <<<
+### "Plugins" >>>
+${SKIP_SH_PLUGINS:-false} || careful_source "$SHELL_CONFIG_DIR/plugins"
+
 # <<<
 
 # <<<