Add scripts/rip.c

...to extract pull-request and issue reference from NEWS.md and output
them as GH URLs.

diff --git a/scripts/rip.c b/scripts/rip.c
new file mode 100644 (file)
index 0000000..d7600b9
--- /dev/null
+++ b/scripts/rip.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Helper to extract references from NEWS.md and print them as github URLs
+ * Usage: gcc -o rip scripts/rip.c && ./rip < NEWS.md
+ *
+ * Copyright (C) Johan Malm 2025
+ */
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static int *refs;
+static int nr_refs, alloc_refs;
+
+static void
+add_ref(int num)
+{
+       if (nr_refs == alloc_refs) {
+               alloc_refs = (alloc_refs + 16) * 2;
+               refs = realloc(refs, alloc_refs * sizeof(int));
+       }
+       int *ref = refs + nr_refs;
+       nr_refs++;
+       *ref = num;
+}
+
+static bool
+is_unique(int num)
+{
+       for (int i = 0; i < nr_refs; ++i) {
+               if (refs[i] == num) {
+                       return false;
+               }
+       }
+       return true;
+}
+
+void process_line(const char *line)
+{
+       const char *p = line;
+       while ((p = strchr(p, '['))) {
+               int n, num = 0;
+               n = sscanf(p, "[#%d]", &num);
+               if (n && is_unique(num)) {
+                       add_ref(num);
+               }
+               ++p;
+       }
+}
+
+static int
+compare_ints(const void *a, const void *b)
+{
+       return *(const int *)a - *(const int *)b;
+}
+
+int main(int argc, char **argv)
+{
+       char *line = NULL; size_t len = 0;
+       while (getline(&line, &len, stdin) != -1) {
+               char *p = strrchr(line, '\n');
+               if (p) {
+                       *p = '\0';
+               }
+               /* Do not process the references at the bottom of NEWS.md */
+               if (!strncmp(line, "[0.1.0]", 7)) {
+                       break;
+               }
+               process_line(line);
+       }
+       free(line);
+       qsort(refs, nr_refs, sizeof(int), compare_ints);
+       for (int i = 0; i < nr_refs; ++i) {
+               int r = refs[i];
+               /* GH groks the .../pull/%d format for both issues and PRs */
+               printf("[#%d]: https://github.com/labwc/labwc/pull/%d\n", r, r);
+       }
+       free(refs);
+}