Add manpage

meson.build

@@ -51,5 +51,32 @@ executable(
 	'wlsunset',
 	['main.c', 'color_math.c'],
 	dependencies: [protocols_dep, m, rt],
-	install: true
+	install: true,
 )
+
+scdoc = dependency('scdoc', required: get_option('man-pages'), version: '>= 1.9.7')
+
+if scdoc.found()
+	sh = find_program('sh')
+
+	man_pages = ['wlsunset.1.scd']
+
+	mandir = get_option('mandir')
+
+	foreach src : man_pages
+		topic = src.split('.')[0]
+		section = src.split('.')[1]
+		output = '@0@.@1@'.format(topic, section)
+
+		custom_target(
+			output,
+			input: src,
+			output: output,
+			command: [
+				sh, '-c', '@0@ < @INPUT@ > @1@'.format(scdoc.get_pkgconfig_variable('scdoc'), output)
+			],
+			install: true,
+			install_dir: '@0@/man@1@'.format(mandir, section)
+		)
+	endforeach
+endif

meson_options.txt

@@ -0,0 +1 @@
+option('man-pages', type: 'feature', value: 'auto', description: 'Generate and install man pages')

wlsunset.1.scd

@@ -0,0 +1,50 @@
+wlsunset(1)
+
+# NAME
+
+wlsunet - Day/night gamma adjustments for Wayland compositors supporting wlr-gamma-control-unstable-v1
+
+# SYNOPSIS
+
+*wlsunset* [options...]
+
+# OPTIONS
+
+*-h*
+	show this help message
+
+*-T* <temp>
+	set high temperature (default: 6500)
+
+*-t* <temp>
+	set low temperature (default: 4000)
+
+*-l* <lat>
+	set latitude (e.g. 39.9)
+
+*-L* <long>
+	set longitude (e.g. 116.3)
+
+*-s* <start>
+	set manual start time (e.g. 06:30)
+
+*-S* <stop>
+	set manual stop time (e.g. 19:30)
+
+*-g* <gamma>
+	set gamma (default: 1.0)
+
+# EXAMPLE
+
+```
+# Beijing lat/long.
+wlsunset -l 39.9 -L 116.3
+```
+
+Greater precision than one decimal place serves no purpose
+(https://xkcd.com/2170/) other than padding the command-line.
+
+# AUTHORS
+
+Maintained by Kenny Levinsen <contact@kl.wtf>. For more information about
+wlsunset development, see https://sr.ht/~kennylevinsen/wlsunset.