First version of automatic ID and COUNT columns, to discuss (for now,

columns created when NUC_SEQ views are closed if the columns don't
already exist)

src/obiview.h

@@ -55,6 +55,8 @@
 #define COUNT_COLUMN "COUNT"				    /**< The name of the column containing the sequence counts
  	 	 	 	 	 	 	 	 	 	 	 	 *   in NUC_SEQS_VIEW views.
                                 	 	  	  	 */
+#define ID_PREFIX "seq"						    /**< The default prefix of sequence identifiers in automatic ID columns.
+                                	 	  	  	 */
 
 
 /**
@@ -409,6 +411,20 @@ int obi_view_delete_column(Obiview_p view, const char* column_name);
 OBIDMS_column_p obi_view_get_column(Obiview_p view, const char* column_name);
 
 
+/**
+ * @brief Checks if a column exists in a view.
+ *
+ * @param view A pointer on the view.
+ * @param column_name The name of the column in the view.
+ *
+ * @returns A boolean indicating whether or not the column exists in the view.
+ *
+ * @since July 2017
+ * @author Celine Mercier (celine.mercier@metabarcoding.org)
+ */
+bool obi_view_column_exists(Obiview_p view, const char* column_name);
+
+
 /**
  * @brief Gets the pointer on the pointer on a column from its name in a view.
  *
@@ -527,6 +543,25 @@ int obi_save_and_close_view(Obiview_p view);
 int obi_create_auto_count_column(Obiview_p view);
 
 
+/**
+ * @brief Creates an OBI_STR column with the line count of the view it belongs to, and sets all lines with automatic identifiers
+ *        with the form prefix_index.
+ *
+ * @warning The number of lines set corresponds to the line count of the view.
+ *
+ * @param view A pointer on the view.
+ * @param prefix The prefix of automatic ids. The ids have the form prefix_index. If NULL, the default ID_PREFIX is used.
+ *
+ * @returns A value indicating the success of the operation.
+ * @retval 0 if the operation was successfully completed.
+ * @retval -1 if an error occurred.
+ *
+ * @since July 2017
+ * @author Celine Mercier (celine.mercier@metabarcoding.org)
+ */
+int obi_create_auto_id_column(Obiview_p view, const char* prefix);
+
+
 /**
  * @brief Recovers an obiblob from an OBIDMS column containing indices referring to obiblobs,
  *        using the index of the element in the line, and the column pointer, in the context of a view.