cleanup unused functions

rc.d/210-source.sh

@@ -0,0 +1,16 @@
+# Helper to source global definition files.
+
+# Source a system file.  If no filename is given, list the available names.
+s() {
+    local sourcedir="$SYSTEM_DIR/source"
+    if [ $# -eq 0 ]; then
+        ls -1 "$sourcedir"
+        return
+    fi
+
+    local file
+    for file in "$@"; do
+        # shellcheck disable=SC1090
+        . "$sourcedir/$file"
+    done
+}

rc.d/300-completion.sh

@@ -1,7 +1,7 @@
 # Autocompletion configuration
 
-
-if is_interactive; then
+# only load completion for interactive shells
+if [[ $- == *i* ]]; then
     source_if_exists /etc/bash_completion
 
     _bcomp_s() {