Add ability to source catmd.sh itself (providing catmd() also as function)

Outsourced line reading function to linefeeder

linefeeder/linefeeder.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+# define parseline() in the sourcing script
+
+linefeeder() {
+  for arg in "$@"; do
+    case "$1" in 
+      -)
+        # treat - as input stream
+        break;;
+      -*)
+        # Ignore options for now
+        shift;;
+    esac
+  done
+
+  local file= 
+  local line=
+  local args=("$@")
+
+  # Use standard input if no files are present
+  [ $# -eq 0 ] && args[0]="/dev/stdin"
+  
+  for file in "${args[@]}"; do
+    [ "$file" == "-" ] && file="/dev/stdin"
+    while IFS='' read -r line; do 
+      parseline "$line"
+    done <"${file}"
+    # If last line in a file has no newline, read ends but still populates $line
+    [[ $line ]] && parseline "$line"
+  done
+}