meson: generate man pages

doc/meson.build

@@ -0,0 +1,22 @@
+sh = find_program('sh', native: true)
+scdoc = dependency('scdoc', native: true)
+scdoc_prog = find_program(scdoc.get_pkgconfig_variable('scdoc'), native: true)
+gzip = find_program('gzip', native: true)
+
+foreach man_src : ['f00bar.1.scd', 'f00bar.5.scd', 'f00bar-decorations.5.scd',
+                   'f00bar-modules.5.scd', 'f00bar-particles.5.scd',
+                   'f00bar-tags.5.scd']
+  parts = man_src.split('.')
+  name = parts[-3]
+  section = parts[-2]
+  out = '@0@.@1@.gz'.format(name, section)
+
+  custom_target(
+    out,
+    output: out,
+    input: man_src,
+    command: [sh, '-c', '@0@ < @INPUT@ | @1@ > doc/@2@'.format(
+      scdoc_prog.path(), gzip.path(), out)],
+    install: true,
+    install_dir: '@0@/man@1@'.format(get_option('mandir'), section))
+endforeach