feat: config.h GOSPEL_ONLY -- print all readings (default) or just the Gospel

Add a compile-time toggle in config.h: GOSPEL_ONLY=0 (default) prints every
reading; GOSPEL_ONLY=1 prints only the Gospel. The Gospel is matched by its
part label, so it works for both forms. Help and the compiled-settings line
report the mode. Also tidy print_day's header underline to match the width of
the "<form> for <date>" line instead of the reading count. No data change;
strict -Wsign-conversion clean in both modes.

Claude-Session: https://claude.ai/code/session_01S1CD1u3tgSS4xNu6WHfp5a

3 files changed, 20 insertions, 6 deletions

diff --git a/README.md b/README.md
index e6b494c..2852836 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,7 @@ Edit `config.h` (copied from `config.def.h` on first build), then `make`:
   * `FORM_OF` / `FORM_EF`         — Ordinary Form (1969) or Extraordinary Form (1962)
   * `SIGLA_ENGLISH` / `SIGLA_LATIN` — citation dialect (`Jer 14` vs `Ier 14`)
   * `COLOR`                       — colour the day name with its liturgical colour
+  * `GOSPEL_ONLY`                 — print every reading (0, default) or just the Gospel (1)
 
 One form per binary; for both, build twice. The interface is English only.
 
diff --git a/clectio.c b/clectio.c
index 6461e51..24cb4b6 100644
--- a/clectio.c
+++ b/clectio.c
@@ -67,18 +67,23 @@ static const char *citation(int r) {
 
 static void print_day(long off, const char *datestr) {
 	const Day *d = &days[cal[off]];
-	unsigned k, ri;
+	unsigned ri;
+	int n;
 	if (usecolor)
-		printf("%s%s\033[0m", colansi[d->colour], names[d->name]);
+		printf("%s%s\033[0m\n", colansi[d->colour], names[d->name]);
 	else
-		printf("%s \xc2\xb7 %s", names[d->name], colname[d->colour]);
-	printf("\n%s for %s\n", FORMNAME, datestr);
-	for (k = 0; k < d->rlen; k++)
+		printf("%s \xc2\xb7 %s\n", names[d->name], colname[d->colour]);
+	n = printf("%s for %s\n", FORMNAME, datestr) - 1; /* underline that line */
+	while (n-- > 0)
 		putchar('=');
 	putchar('\n');
 	for (ri = 0; ri < d->rlen; ri++) {
 		const Reading *r = &readings[rpool[d->roff + ri]];
 		unsigned v;
+#if GOSPEL_ONLY
+		if (strcmp(parts[r->part], "Gospel") != 0)
+			continue;
+#endif
 		printf("\n%s (%s)\n\n", parts[r->part], citation(rpool[d->roff + ri]));
 		for (v = 0; v < r->vlen; v++)
 			printf("%s\n", verse[vpool[r->voff + v]]);
@@ -95,7 +100,7 @@ int main(int argc, char **argv) {
 
 	if (argc > 1 && (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help"))) {
 		fprintf(stderr, "usage: clectio [YYYY-MM-DD]   (default: today)\n"
-		                "  compiled: %s, %s, %d-%d\n", FORMNAME, SIGLANAME, EPOCH_Y, EPOCH_Y + (NDAYS / 366));
+		                "  compiled: %s, %s, %s, %d-%d\n", FORMNAME, SIGLANAME, READMODE, EPOCH_Y, EPOCH_Y + (NDAYS / 366));
 		return 0;
 	}
 	if (argc > 1) {
diff --git a/config.def.h b/config.def.h
index 0447669..e22075f 100644
--- a/config.def.h
+++ b/config.def.h
@@ -12,7 +12,15 @@
 /* --- Colourize the day name with its liturgical colour on a terminal. ---- */
 #define COLOR 1
 
+/* --- Which readings to print. -------------------------------------------- */
+#define GOSPEL_ONLY 0  /* 0 = all readings; 1 = the Gospel only */
+
 /* ------------------------- derived (do not edit) ------------------------- */
+#if GOSPEL_ONLY
+#  define READMODE "Gospel only"
+#else
+#  define READMODE "all readings"
+#endif
 #ifdef FORM_EF
 #  define LITURGY  "gen/liturgy_ef.h"
 #  define FORMNAME "Extraordinary Form (1962)"