document lowdown as dependency; add some error handling

README.md

@@ -21,6 +21,16 @@ make script. :)
 You can see this method in action (maybe! if we didn't break it) at
 [https://testing.anarchyplanet.org](https://testing.anarchyplanet.org).
 
+## Dependencies
+
+We use [lowdown](https://kristaps.bsd.lv/lowdown/) for markdown
+conversion. See its documentation:
+
+* [overview](https://kristaps.bsd.lv/lowdown/)
+* [lowdown(1)](https://kristaps.bsd.lv/lowdown/lowdown.1.html)
+* [lowdown(5)](https://kristaps.bsd.lv/lowdown/lowdown.5.html) which
+describes the lanuage syntax
+
 ## TODOs
 
 ### TODO discuss and decide on sections

publish.sh

@@ -1,11 +1,17 @@
 #!/usr/bin/env bash
 
 PUB_DIR=${1:-/home/html/planet/static}
-FILES=md/*.md
+MD_FILES=md/*.md
+OTHER_FILES=*.css
+
+if ! test -d $PUB_DIR; then
+    echo "error: PUB_DIR does not exist:" $PUB_DIR
+    exit 1
+fi
 
 test -d tmp || mkdir tmp
 
-for f in $FILES
+for f in $MD_FILES
 do
     filename=$(basename -- $f .md)
     echo "publishing md/$filename.md to $PUB_DIR/$filename.html"
@@ -21,3 +27,4 @@ do
     cat tmp/head.html nav.html tmp/$filename.html foot.html tail.html \
         > $PUB_DIR/$filename.html
 done
+cp $OTHER_FILES $PUB_DIR