1 files changed, 19 insertions, 0 deletions
diff --git a/src/message.zig b/src/message.zig
index 0935ce96..0855c448 100644
--- a/src/message.zig
+++ b/src/message.zig
@@ -43,6 +43,25 @@ extern "c" fn localtime_r(timep: *const libc.time_t, result: *Tm) ?*Tm;
 /// clock cannot live in a golden — but a message that vanished under the
 /// harness could not be pinned at all, so the row still renders, still says
 /// what happened, and still occupies the same columns.
+/// The stamped text WITHOUT its clock — what two of these rows have in common
+/// when they say the same thing at different times.
+///
+/// The message log de-duplicates on this rather than on the whole row, because
+/// the clock makes every host message unique by construction: `saved x` at
+/// 14:32:07 and at 14:32:09 are different strings, so a watched file rebuilt
+/// in a loop filled the ring with identical-looking rows, each counted once.
+/// That is exactly the case the de-duplication exists for.
+pub fn body(text: []const u8) []const u8 {
+    // `HH:MM:SS  ` — ten bytes, digits or the `--:--:--` the harness blanks
+    // them to. Anything else is a message that was never stamped.
+    if (text.len < 10) return text;
+    if (text[2] != ':' or text[5] != ':' or text[8] != ' ' or text[9] != ' ') return text;
+    for ([_]usize{ 0, 1, 3, 4, 6, 7 }) |i| {
+        if (!std.ascii.isDigit(text[i]) and text[i] != '-') return text;
+    }
+    return text[10..];
+}
+
 pub fn stamp(buf: []u8, verb: []const u8, subject: []const u8) []const u8 {
     var clock: [8]u8 = "--:--:--".*;
     const notime = if (libc.getenv("PARDES_NOTIME")) |v| std.mem.span(v).len != 0 else false;