Deprecated types with erlang.mk + Archives

_posts/2014-03-23-buffered-polyline.md

@@ -10,7 +10,7 @@ comments: true
 
 At work, we needed a simple way to buffer a polyline in order to search for stuff along the route from A to B. I'll explain how we used Google's Maps API and [JSTS](https://github.com/bjornharrtell/jsts) in order to achieve this easily.
 
-The first thing we had to do, was to "transform" each element in the `overview_path` (which the `DirectionsService` returns) to GeoJSON, because that's what JSTS understands.
+The first thing we had to do was to "transform" each element in the `overview_path` (which the `DirectionsService` returns) to GeoJSON, because that's what JSTS understands.
 
 {% highlight javascript linenos %}
 var overviewPath = response.routes[0].overview_path,

_posts/2014-12-24-supporting-deprecated-types-with-erlang-mk.md

@@ -0,0 +1,39 @@
+---
+layout: post
+title: Supporting Deprecated Types with erlang.mk
+description: "Simple workaround for supporting deprecated types and warnings_as_errors with erlang.mk."
+date: 2014-12-24 13:25:00 CET
+category: posts
+tags: [erlang, programming, english]
+comments: true
+---
+
+In April I wrote about how I use the `platform_define` feature of [rebar](https://github.com/rebar/rebar) to make deprecated types work without removing `warnings_as_errors`. I have switched to [erlang.mk](https://github.com/ninenines/erlang.mk) since then, but needed a similar feature for [one of my libraries](https://github.com/nifoc/noesis).
+
+Since erlang.mk only uses [make](http://en.wikipedia.org/wiki/Make_(software)), adding support for a `platform_define`-like feature is very straightforward.
+
+{% highlight makefile %}
+otp_release = $(shell erl -noshell -eval 'io:format("~s", [erlang:system_info(otp_release)]), init:stop()')
+otp_17plus = $(shell echo $(otp_release) | grep -q -E "^[[:digit:]]+$$" ; echo $$?)
+{% endhighlight %}
+
+The first variable (`otp_release`) will contain the OTP version (e.g. `17`). The second variable (`otp_17plus`) will be either `0` or `1`, depending on wether or not `otp_release` matches a regular expression. The regular expression checks if `otp_release` is just a number (e.g. `17`) or not (e.g. `R16B03-1`).
+
+That's enough to conditionally add options to `erlc`.
+
+{% highlight makefile %}
+ifeq ($(otp_17plus),0)
+	ERLC_OPTS += -Dnamespaced_types=1
+	TEST_ERLC_OPTS += -Dnamespaced_types=1
+endif
+{% endhighlight %}
+
+This will define `namespaced_types` only on Erlang 17+, allowing you to use the same `ifdef`-switch from April.
+
+{% highlight erlang linenos %}
+-ifdef(namespaced_types).
+-type xxx_dict() :: dict:dict().
+-else.
+-type xxx_dict() :: dict().
+-endif.
+{% endhighlight %}

archives/posts.html

@@ -0,0 +1,20 @@
+---
+layout: page
+title: Post Archive
+---
+
+{% for post in site.posts %}
+  {% capture month %}{{ post.date | date: '%m%Y' }}{% endcapture %}
+  {% capture nmonth %}{{ post.next.date | date: '%m%Y' }}{% endcapture %}
+
+  {% if month != nmonth %}
+    {% if forloop.index != 1 %}
+      </ul>
+    {% endif %}
+
+    <h3>{{ post.date | date: '%B %Y' }}</h3>
+    <ul>
+  {% endif %}
+
+  <li><a href="{{ post.url }}">{{ post.title }}</a></li>
+{% endfor %}

archives/tags.html

@@ -1,6 +1,5 @@
 ---
 layout: page
-permalink: /tags/
 title: Tag Archive
 ---