Serve documents when a module keeps a collection, not by its inputs' names

pure-serve took a module with an input named show or edit for a
document app and refused it unless both were keyed messages: an app with
a plain message named edit compiled and then would not start (review
004, an earlier P2). Documents are what a module keeps in a keyed
collection; now the host serves them when the module declares one, and
inputs named show and edit are otherwise messages as any other.
check.py's server_plain_edit starts such an app and posts to edit.

1 files changed, 4 insertions, 2 deletions

diff --git a/serve/serve.c b/serve/serve.c
index 96e1b1d..e8b3ec3 100644
--- a/serve/serve.c
+++ b/serve/serve.c
@@ -2131,9 +2131,11 @@ static bool load_module(PureModule *m, const char *path, bool *documents, uint32
         fprintf(stderr, "Module: %s\n", error);
         return false;
     }
-    /* Documents are served when the module has show and edit, as keyed messages. */
+    /* Documents are served when the module keeps a keyed collection: its keyed
+     * messages show and edit read and write one by key. Without one, inputs
+     * named show and edit are messages as any other. */
     int show = pure_module_input(m, "show"), edit = pure_module_input(m, "edit");
-    *documents = show >= 0 || edit >= 0;
+    *documents = m->collections > 0;
     if (*documents && (show < 0 || edit < 0 || m->input[show].kind != PURE_KIND_MESSAGE || !m->input[show].keyed ||
                        m->input[edit].kind != PURE_KIND_MESSAGE || !m->input[edit].keyed)) {
         fputs("Module: documents need keyed messages named show and edit\n", stderr);