From c9f3bf46f0de09edb796e35f3dcff349febf75c9 Mon Sep 17 00:00:00 2001
From: Lukasz Kasprzak <lukas@labunix.xyz>
Date: Fri, 24 Jul 2026 10:32:28 +0200
Subject: dayinfo: show feast/day name + colour (modern niedziela + traditional
 missalemeum) in cli/tui/web; v0.5.0

---
 internal/liturgy/parse.go | 53 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

(limited to 'internal/liturgy/parse.go')

diff --git a/internal/liturgy/parse.go b/internal/liturgy/parse.go
index 64e6928..4c1a935 100644
--- a/internal/liturgy/parse.go
+++ b/internal/liturgy/parse.go
@@ -23,8 +23,32 @@ var (
 	h4Re       = regexp.MustCompile(`(?s)<h4>(.*?)</h4>`)
 	pRe        = regexp.MustCompile(`(?s)<p>(.*?)</p>`)
 	citationRe = regexp.MustCompile(`\((.+)\)\s*$`)
+
+	// dayNamePRe matches every classed <p><em>...</em></p> on the page; only
+	// the one whose class carries both "fw-bold" and a "color-" role (see
+	// dayNameParaMatches) is the day's celebration name -- the page also
+	// carries a plain fw-bold (no color-) lookalike higher up that must not
+	// win instead.
+	dayNamePRe = regexp.MustCompile(`(?s)<p class="([^"]*)">\s*<em>(.*?)</em>\s*</p>`)
+
+	// dayColourRe matches niedziela.pl's "Kolor szat: <word>" vestment-colour
+	// line, tolerating the <span>/<strong> markup wrapped around the colour
+	// word on the page (see internal/liturgy/testdata/2026-07-22.html).
+	dayColourRe = regexp.MustCompile(`Kolor szat:\s*(?:<[^>]+>\s*)*([\p{L}]+)`)
 )
 
+// modernColours maps niedziela.pl's Polish vestment-colour words to
+// DayInfo's normalized colour names; anything not listed here (including a
+// multi-option line like "zielony albo biały albo czerwony", which matches
+// only its first word) is left for the caller to treat as "" if absent.
+var modernColours = map[string]string{
+	"biały":     "white",
+	"zielony":   "green",
+	"fioletowy": "violet",
+	"czerwony":  "red",
+	"różowy":    "rose",
+}
+
 // panePattern matches the opening tag of the tab-pane div carrying the given
 // tab id, e.g. `<div class="tab-pane fade " id="tabnowy0all">`.
 func panePattern(tab string) *regexp.Regexp {
@@ -122,6 +146,35 @@ func Parse(pageHTML string) ([]Section, error) {
 	return sections, nil
 }
 
+// ParseDayInfo extracts the day's celebration name and liturgical colour
+// from a niedziela.pl page: Name is the inner text of the <p class="...
+// fw-bold color-XXX"><em>NAME</em></p> paragraph (there is also an earlier,
+// plain fw-bold-but-no-color- lookalike on the page -- see dayNamePRe --
+// which must not match instead), and Colour comes from the page's "Kolor
+// szat: <word>" line, mapped via modernColours (case-insensitive; unknown
+// word -> ""). Season is always "" -- the modern lectionary folds its
+// temporal context into Name on temporal days rather than carrying it
+// separately. A page whose markup doesn't match either pattern (a layout
+// change, or a fixture with neither) yields a zero DayInfo, never an error:
+// the readings are the load-bearing content, the header is a nice-to-have.
+func ParseDayInfo(pageHTML string) DayInfo {
+	var info DayInfo
+
+	for _, m := range dayNamePRe.FindAllStringSubmatch(pageHTML, -1) {
+		class := m[1]
+		if strings.Contains(class, "fw-bold") && strings.Contains(class, "color-") {
+			info.Name = strings.Join(htmlToLines(m[2]), " ")
+			break
+		}
+	}
+
+	if m := dayColourRe.FindStringSubmatch(pageHTML); m != nil {
+		info.Colour = modernColours[strings.ToLower(m[1])]
+	}
+
+	return info
+}
+
 // partID assigns the stable liturgical-part identifier for a section heading.
 // A second "1. czytanie" heading on the same day (a split feast offering two
 // alternative first readings) becomes "drugie_czytanie" instead of colliding
-- 
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