wip(commands): re-implement core commands as bash functions

Re-implement all libexec executables as bash functions, with the goal of
being able build a single standalone execuable bash script for
tmuxifier.

lib/commands/alias.sh

@@ -0,0 +1,56 @@
+# Resolve a tmuxifier command alias to its full command name.
+#
+# Usage:
+#   tmuxifier-alias <alias>
+#
+# Arguments:
+#   $1 - Alias to resolve
+#
+# Output:
+#   The full command name if alias is recognized, empty otherwise.
+#
+# Returns:
+#   0 - Alias was recognized
+#   1 - Alias was not recognized
+tmuxifier-alias() {
+  # Provide tmuxifier help
+  if calling-help "$@"; then
+    echo "usage: tmuxifier alias <alias>
+
+Resolve a command alias to it's full name."
+    return
+  fi
+
+  case "$1" in
+    "session" | "ses" | "s")
+      echo "load-session"
+      ;;
+    "window" | "win" | "w")
+      echo "load-window"
+      ;;
+    "new-ses" | "nses" | "ns")
+      echo "new-session"
+      ;;
+    "new-win" | "nwin" | "nw")
+      echo "new-window"
+      ;;
+    "edit-ses" | "eses" | "es")
+      echo "edit-session"
+      ;;
+    "edit-win" | "ewin" | "ew")
+      echo "edit-window"
+      ;;
+    "l")
+      echo "list"
+      ;;
+    "list-ses" | "lses" | "ls")
+      echo "list-sessions"
+      ;;
+    "list-win" | "lwin" | "lw")
+      echo "list-windows"
+      ;;
+    *)
+      return 1
+      ;;
+  esac
+}