make download rule to retrieve all (new) external data

Check for any updates by running `make -B download` periodically.

diff --git a/Makefile b/Makefile
index 987db4152d9ba1ec0d73fc0d26d60099f61e4d1b..bc0c630b04a00bbc3e49acce496745fca5cf288b 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1,13 +1,16 @@
 all: unicode-char.inc.pl unicode-cover.inc.pl countries.inc.pl data/browser/support.inc.pl
 
+download: data/DerivedAge.txt data/rfc1345.txt data/countryInfo.txt data/caniuse.json
+.PHONY: download
+
 data/DerivedAge.txt:
-       wget http://www.unicode.org/Public/UNIDATA/DerivedAge.txt -O $@
+       tools/wget-ifmodified http://www.unicode.org/Public/UNIDATA/$(@F) $@
 
 unicode-age.inc.pl: data/DerivedAge.txt
        tools/mkcharver $< >$@
 
 data/rfc1345.txt:
-       wget http://www.ietf.org/rfc/rfc1345.txt -O $@
+       tools/wget-ifmodified http://www.ietf.org/rfc/$(@F) $@
 
 digraphs.inc.pl: data/rfc1345.txt
        tools/mkdigraphlist $< >$@
@@ -23,7 +26,7 @@ unicode-cover.inc.pl: ttfsupport tools/mkfontinfo
        tools/mkfontinfo >$@
 
 data/countryInfo.txt:
-       wget http://download.geonames.org/export/dump/countryInfo.txt -O $@
+       tools/wget-ifmodified http://download.geonames.org/export/dump/$(@F) $@
 
 countries.inc.pl: data/countryInfo.txt
        tools/mkcountries-geonames $< >$@