Add scripts/rip.c

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

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);
+}