tools/ccanlint: extract examples in separate test.

[ccan] / tools / ccanlint / tests / has_examples.c

diff --git a/tools/ccanlint/tests/has_examples.c b/tools/ccanlint/tests/has_examples.c
new file mode 100644 (file)
index 0000000..12035e6
--- /dev/null
+++ b/tools/ccanlint/tests/has_examples.c
@@ -0,0 +1,141 @@
+#include <tools/ccanlint/ccanlint.h>
+#include <tools/tools.h>
+#include <ccan/talloc/talloc.h>
+#include <ccan/str/str.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <limits.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <err.h>
+#include <string.h>
+#include <ctype.h>
+
+/* Creates and adds an example file. */
+static char *add_example(struct manifest *m, struct ccan_file *source,
+                        bool keep,
+                        struct doc_section *example)
+{
+       char *name;
+       unsigned int i;
+       int fd;
+       struct ccan_file *f;
+
+       name = maybe_temp_file(m, ".c", keep, 
+                              talloc_asprintf(m, "example-%s-%s",
+                                              source->name,
+                                              example->function));
+       f = new_ccan_file(m, talloc_dirname(m, name), talloc_basename(m, name));
+       talloc_steal(f, name);
+       list_add(&m->examples, &f->list);
+
+       fd = open(f->fullname, O_WRONLY | O_CREAT | O_EXCL, 0600);
+       if (fd < 0)
+               return talloc_asprintf(m, "Creating temporary file %s: %s",
+                                      f->fullname, strerror(errno));
+
+       for (i = 0; i < example->num_lines; i++) {
+               if (write(fd, example->lines[i], strlen(example->lines[i]))
+                   != strlen(example->lines[i])
+                   || write(fd, "\n", 1) != 1) {
+                       close(fd);
+                       return "Failure writing to temporary file";
+               }
+       }
+       close(fd);
+       return NULL;
+}
+
+/* FIXME: We should have one example per function in header. */
+struct score {
+       bool info_example, header_example;
+       char *error;
+};
+
+static void *extract_examples(struct manifest *m,
+                             bool keep,
+                             unsigned int *timeleft)
+{
+       struct ccan_file *f;
+       struct doc_section *d;
+       struct score *score = talloc(m, struct score);
+
+       score->info_example = score->header_example = false;
+       score->error = NULL;
+
+       list_for_each(get_ccan_file_docs(m->info_file), d, list) {
+               if (streq(d->type, "example")) {
+                       score->error = add_example(m, m->info_file, keep, d);;
+                       if (score->error)
+                               return score;
+                       score->info_example = true;
+               }
+       }
+
+       /* Check main header. */
+       list_for_each(&m->h_files, f, list) {
+               if (!strstarts(f->name, m->basename)
+                   || strlen(f->name) != strlen(m->basename) + 2)
+                       continue;
+
+               list_for_each(get_ccan_file_docs(f), d, list) {
+                       if (streq(d->type, "example")) {
+                               score->error = add_example(m, f, keep, d);
+                               if (score->error)
+                                       return score;
+                               score->header_example = true;
+                       }
+               }
+       }
+       return score;
+}
+
+static unsigned int score_examples(struct manifest *m, void *check_result)
+{
+       struct score *score = check_result;
+       int total = 0;
+
+       if (score->error)
+               return 0;
+       total += score->info_example;
+       total += score->header_example;
+       return total;
+}
+
+static const char *describe_examples(struct manifest *m,
+                                    void *check_result)
+{
+       struct score *score = check_result;
+       char *descrip = NULL;
+
+       if (score->error)
+               return score->error;
+
+       if (!score->info_example)
+               descrip = talloc_asprintf(score,
+               "Your _info file has no module example.\n\n"
+               "There should be an Example: section of the _info documentation\n"
+               "which provides a concise toy program which uses your module\n");
+
+       if (!score->header_example)
+               descrip = talloc_asprintf(score,
+                "%sMain header file file has no examples\n\n"
+                "There should be an Example: section for each public function\n"
+                 "demonstrating its use\n", descrip ? descrip : "");
+
+       return descrip;
+}
+
+struct ccanlint has_examples = {
+       .key = "has-examples",
+       .name = "_info and header files have examples",
+       .score = score_examples,
+       .check = extract_examples,
+       .describe = describe_examples,
+       .total_score = 2,
+};
+
+REGISTER_TEST(has_examples, &has_info, NULL);