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package render
// Weather glyphs per icon set, keyed by WMO code group.
//
// The "nerd" codepoints are from the Nerd Fonts Weather range (U+E300-U+E3E3),
// which JetBrains Mono Nerd Font and MesloLGS NF both carry. They are single
// cell and monochrome, so they take the terminal's foreground colour and do not
// break a remapped palette.
//
// The "emoji" set is colour and comes from a fallback font. Its glyphs are not
// all one cell wide -- see width.go -- which is why every pad goes through
// DisplayWidth.
var iconSets = map[string]map[string]string{
"nerd": {
"clear": "",
"partly": "",
"cloudy": "",
"fog": "",
"drizzle": "",
"rain": "",
"snow": "",
"storm": "",
},
"emoji": {
"clear": "☀",
"partly": "⛅",
"cloudy": "☁",
"fog": "\U0001F32B",
"drizzle": "\U0001F326",
"rain": "\U0001F327",
"snow": "\U0001F328",
"storm": "⛈",
},
}
// iconGroup maps a WMO weather code onto a glyph group.
func iconGroup(code int) string {
switch {
case code == 0 || code == 1:
return "clear"
case code == 2:
return "partly"
case code == 3:
return "cloudy"
case code == 45 || code == 48:
return "fog"
case code >= 51 && code <= 57:
return "drizzle"
case code >= 61 && code <= 67, code >= 80 && code <= 82:
return "rain"
case code >= 71 && code <= 77, code == 85 || code == 86:
return "snow"
case code >= 95:
return "storm"
}
return "cloudy"
}
// Icon returns the glyph for a weather code in the named set. An unknown set,
// or "none", yields an empty string so the column simply renders blank.
func Icon(set string, code int) string {
glyphs, ok := iconSets[set]
if !ok {
return ""
}
return glyphs[iconGroup(code)]
}
// IconWidth is the display width the icon column should reserve for a set.
// The emoji set contains wide glyphs, so its column is two cells even for the
// entries that happen to be one.
func IconWidth(set string) int {
glyphs, ok := iconSets[set]
if !ok {
return 0
}
w := 1
for _, g := range glyphs {
if gw := DisplayWidth(g); gw > w {
w = gw
}
}
return w
}
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