externalize awk scripts

src/awk/altertodo.awk

@@ -0,0 +1,41 @@
+# Increase/decrease priority, or toggle completed status
+#
+# If `delta` is specified using `-v`, then the priority value is increased by
+# `delta.` If `delta` is unspecified (or equal to 0), then the completeness
+# status is toggled.
+BEGIN { 
+  FS=":";
+  zulu = strftime("%Y%m%dT%H%M%SZ", systime(), 1);
+  delta = delta + 0; # cast as integer
+}
+/^END:VTODO/ && inside     { 
+  # Print sequence and last-modified, if not yet printed
+  if (!seq) print "SEQUENCE:1";
+  if (!lm) print "LAST-MODIFIED:" zulu;
+
+  # Print priority
+  prio = prio ? prio + delta : 0 + delta;
+  prio = prio < 0 ? 0 : prio;
+  prio = prio > 9 ? 9 : prio;
+  print "PRIORITY:" prio;
+
+  # Print status (toggle if needed)
+  bit_status = status == "COMPLETED" ? 1 : 0;
+  bit_toggle = delta ? 0 : 1;
+  percent = xor(bit_status, bit_toggle) ? 100 : 0;
+  status = xor(bit_status, bit_toggle) ? "COMPLETED" : "NEEDS-ACTION";
+  print "STATUS:" status
+  print "PERCENT-COMPLETE:" percent
+
+  # print rest
+  inside = ""; 
+  print $0;
+  next
+}
+/^BEGIN:VTODO/                { inside = 1;    print;                       next }
+/^SEQUENCE/ && inside         { seq = 1;       print "SEQUENCE:" $2+1;      next }
+/^LAST-MODIFIED/ && inside    { lm = 1;        print "LAST-MODIFIED:" zulu; next }
+/^PRIORITY:/ && inside        { prio = $2;                                  next }
+/^STATUS/ && inside           { status = $2;                                next }
+/^PERCENT-COMPLETE/ && inside {                                             next } # ignore, we take STATUS:COMPLETED as reference
+{ print }