From 2468224d0aaacd8b0e7478af55142bcd831d2b77 Mon Sep 17 00:00:00 2001
From: Lukasz Kasprzak <lukas@labunix.xyz>
Date: Wed, 29 Jul 2026 09:55:22 +0200
Subject: feat: standalone calendar overrides (calendar.h) + document
 customization

Add a compile-time override table for MINOR local calendar changes, standalone
(no lectio, no toolchain): edit calendar.h (copied from calendar.def.h), add a
{ month, day, colour, "name" } row, make. It replaces a fixed date's name and
colour, every year, in both single-day and --month output. Limits (no engine):
fixed dates only; name/colour only, not readings or rank/precedence; an override
wins unconditionally.

README gains a "Customize the calendar" section documenting both tiers with
their limits: the standalone override above, and -- for readings, ranks and
movable feasts -- regenerating gen/ from a lectio calendar layer via
clectio-gen (-caldir/-use), then rebuilding with CORPUS= to repack any newly
cited verses, with a git-checkout revert note.

Both forms build clean under -Wall -Wextra; binary unchanged at 666 KB; default
(empty override table) output is unchanged.

Claude-Session: https://claude.ai/code/session_01S1CD1u3tgSS4xNu6WHfp5a
---
 clectio.c | 35 ++++++++++++++++++++++++++++-------
 1 file changed, 28 insertions(+), 7 deletions(-)

(limited to 'clectio.c')

diff --git a/clectio.c b/clectio.c
index 1839ade..469d074 100644
--- a/clectio.c
+++ b/clectio.c
@@ -30,6 +30,21 @@ static int usecolor;
 static const char *const colname[] = { "green", "white", "red", "violet", "rose", "black" };
 static const char *const colansi[] = { "\033[32m", "\033[37m", "\033[31m", "\033[35m", "\033[95m", "\033[90m" };
 
+/* Local calendar overrides: replace one fixed date's name + colour. The colour
+ * names below match colname[]/colansi[] above (index order). The user table
+ * lives in calendar.h (copied from calendar.def.h); see it for the limits. */
+enum { GREEN, WHITE, RED, VIOLET, ROSE, BLACK };
+typedef struct { int mon, day, colour; const char *name; } Override;
+#include "calendar.h" /* static const Override overrides[]; ends with a {0,...} row */
+
+static const Override *find_override(int mon, int day) {
+	const Override *o;
+	for (o = overrides; o->mon; o++)
+		if (o->mon == mon && o->day == day)
+			return o;
+	return NULL;
+}
+
 /* Days since the civil epoch 1970-01-01 (Howard Hinnant's algorithm). */
 static long days_from_civil(long y, unsigned m, unsigned d) {
 	y -= m <= 2;
@@ -131,12 +146,15 @@ static int print_month(int y, int mon) {
 	for (day = 1; day <= dim; day++) {
 		long civ = civ1 + (day - 1);
 		const Day *d = &days[cal[off1 + (day - 1)]];
+		const Override *ov = find_override(mon, day);
+		const char *dname = ov ? ov->name : names[d->name];
+		int dcol = ov ? ov->colour : d->colour;
 		int w = (int)((civ + 4) % 7); /* 1970-01-01 was Thursday; 0 = Sunday */
-		printf("%s %02d  %-6s  ", wd[w], day, colname[d->colour]);
+		printf("%s %02d  %-6s  ", wd[w], day, colname[dcol]);
 		if (usecolor)
-			printf("%s%s\033[0m\n", colansi[d->colour], names[d->name]);
+			printf("%s%s\033[0m\n", colansi[dcol], dname);
 		else
-			printf("%s\n", names[d->name]);
+			printf("%s\n", dname);
 	}
 	return 0;
 }
@@ -165,14 +183,17 @@ static int run_month(const char *spec) {
 	return print_month(y, mon);
 }
 
-static void print_day(long off, const char *datestr, int gospel, int wrap) {
+static void print_day(long off, const char *datestr, int mon, int day, int gospel, int wrap) {
 	const Day *d = &days[cal[off]];
+	const Override *ov = find_override(mon, day);
+	const char *dname = ov ? ov->name : names[d->name];
+	int dcol = ov ? ov->colour : d->colour;
 	unsigned ri;
 	int n;
 	if (usecolor)
-		printf("%s%s\033[0m\n", colansi[d->colour], names[d->name]);
+		printf("%s%s\033[0m\n", colansi[dcol], dname);
 	else
-		printf("%s \xc2\xb7 %s\n", names[d->name], colname[d->colour]);
+		printf("%s \xc2\xb7 %s\n", dname, colname[dcol]);
 	n = printf("%s for %s\n", FORMNAME, datestr) - 1; /* underline that line */
 	while (n-- > 0)
 		putchar('=');
@@ -263,6 +284,6 @@ int main(int argc, char **argv) {
 		wrap = istty ? termwidth() : 0;
 
 	load_text();
-	print_day(off, datestr, gospel, wrap);
+	print_day(off, datestr, m, dd, gospel, wrap);
 	return 0;
 }
-- 
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