Lay Pure out as a core with the parts selected around it

The app model, the tree store and the HTTP host lived in
prototypes/connections among the earlier document runtime, the store was
known only by its format's name, and Vega compiled six Pure sources by path.
Now, as the README's principle has it:

  core/   runtime, flow and the app model (module*.c), with what the core
          asks of storage (state.h, store.h)
  store/  the tree store (PURETRE3, PUREREC1)
  serve/  pure-serve: HTTP host, outbound delivery, JSON in place
  cli/    pure-run, pure-edit-module

A top-level make builds libpure.a (app model and store, for hosts to link)
and the hosts; make check runs the store's and the app model's tests. The
earlier runtime still builds from prototypes/connections against core/ and
store/ (check, check-tree and check-core pass). Design 009 records the rule:
parts by role behind libraries; git repositories split by coupling, so the
store stays here while its contract moves with the core, and Vega stays apart.

1 files changed, 36 insertions, 0 deletions

diff --git a/core/module-save.h b/core/module-save.h
new file mode 100644
index 0000000..bc7adcc
--- /dev/null
+++ b/core/module-save.h
@@ -0,0 +1,36 @@
+#ifndef PURE_MODULE_SAVE_H
+#define PURE_MODULE_SAVE_H
+#include "module.h"
+
+/* App states a data host keeps (docs/design/008-module-format.md), internal
+ * to the module executor. Each text state is a stored draft, each list state
+ * a stored draft its list mirrors, and numbers, cursors and indices are one
+ * stored value by name. A save publishes what changed, all or nothing. */
+
+bool pure_save_enabled(const PureApp *);
+/* A text state of m: its stored value, or its initial constant when none. */
+PureResult pure_save_open_text(PureApp *, const PureModule *m, uint32_t state, PureDraft **out, PureVersion *saved);
+/* A list state of m: its stored items, fields moved by name when the stored
+ * record differs from m's. */
+PureResult pure_save_open_list(PureApp *, const PureModule *m, uint32_t state, PureList **out, PureDraft **draft,
+                               PureVersion *saved);
+/* Open the stored numbers, cursors and indices, and put each stored one of the
+ * same name and kind that still fits into values, for the states of m that
+ * kept marks as new (-1); texts and lists are m's. */
+PureResult pure_save_open_values(PureApp *, const PureModule *m, double *values, const int *kept,
+                                 PureDraft *const *texts, PureList *const *lists);
+/* Store a list whose record changed in its draft, header and items anew. */
+PureResult pure_save_rewrite_list(const PureModule *m, uint32_t state, PureList *list, PureDraft *draft);
+/* The stored links of a starting app (module.h, PureApp); CONFLICT when an
+ * output with sends left is missing or has other fields. */
+PureResult pure_save_open_links(PureApp *, const PureModule *m);
+/* Publish the documents and every state changed since the last save
+ * (values are the states' numbers); revisions are the documents'. */
+PureResult pure_save_commit(PureApp *, const double *values, void *const *documents, size_t document_count,
+                            int64_t *revisions);
+
+/* A list with record's fields, taking from `from` each field of the same name
+ * and kind and giving the others their defaults (module.c). */
+PureResult pure_list_migrate(PureList **out, const PureList *from, const char *const *names,
+                             const uint8_t *text, unsigned count, const PureModule *m, uint32_t record);
+#endif