1 files changed, 8 insertions, 0 deletions
diff --git a/lib.m4 b/lib.m4
index 4a729cd..d15a05d 100644
--- a/lib.m4
+++ b/lib.m4
@@ -4,6 +4,14 @@ m4_changequote([,])
 m4_dnl Output ‘$2’ if the country code matches ‘$1’
 m4_define(__ifcode, [m4_ifelse(__code, [$1], [$2])])
 
+m4_define(__ifextra, [
+	m4_syscmd(grep -iq '^__code' data/extras)
+	m4_ifelse(m4_sysval, 0, [$1])
+])
+
+m4_dnl Expand ‘$3’ if ‘$1’ is a substring of ‘$2’
+m4_define(__ifhas, [m4_ifelse(m4_index([$2], [$1]), -1, [], [$3])])
+
 m4_dnl Execute the script ‘$1’ in the ‘scripts/’ directory
 m4_define(__esyscmd, [m4_esyscmd([scripts/$1])])