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diff --git a/lib/oneliner.lisp b/lib/oneliner.lisp
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+++ b/lib/oneliner.lisp
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+;;;; oneliner.lisp -- holds a local representation of onelienrs.
+
+(in-package :oneliners.cli)
+
+(defstruct oneliner
+  id
+  name
+  oneliner
+  tags
+  brief
+  explanation
+  runstyle
+  createdat
+  editedat
+  createdby
+  isflagged
+  islocked)
+
+
+(defun collect-positional-arguments (ol)
+  "Collects the names of all positional arguments in the oneliner, prefix included."
+  (remove-duplicates 
+   (sort 
+    (ppcre:all-matches-as-strings "#[1-9][0-9]*" (oneliner-oneliner ol))
+    #'string<)
+   :test #'equal))
+
+(defun collect-named-arguments (ol)
+  "Collects the names of all named arguments in the oneliner, prefix included"
+  (remove-duplicates 
+   (ppcre:all-matches-as-strings "#[A-Za-z][A-Za-z0-9_]*" (oneliner-oneliner ol))
+   :test #'equal))
+
+(defun tags-from-oneliner (string)
+  "Splits a string using consequitive whitespace as a separator,
+returning a set of tags"
+  (remove-duplicates
+   (remove-if-not #'executable-on-system-p (ppcre:split " +" string))
+   :test #'equal))
+
+
+
+
+;;; VALIDATION OF ONELINER SLOT VALUES
+
+(defun valid-oneliner-string-p (string)
+  (and (not (find #\newline string))
+       (tags-from-oneliner string)))
+
+(defun valid-brief-description-p (string)
+  (<= (length string) 72))
+
+(defun valid-runstyle-p (string)
+  (member string '("auto" "manual") :test 'equalp))
+
+(defun valid-oneliner-name-p (string)
+  (or (equal string "")
+      (and (< 2 (length string)) 
+           (ppcre:scan "^[a-zA-Z][a-zA-Z0-9_\-]+$" string))))