build the blog with nix

1 files changed, 77 insertions, 0 deletions

diff --git a/src/_posts/2013-07-11-goplus.md b/src/_posts/2013-07-11-goplus.md
new file mode 100644
index 0000000..5ee121e
--- /dev/null
+++ b/src/_posts/2013-07-11-goplus.md
@@ -0,0 +1,77 @@
+---
+title: Go+
+description: >-
+    A simple proof-of-concept script for doing go dependency management.
+---
+
+Compared to other languages go has some strange behavior regarding its project
+root settings. If you import a library called `somelib`, go will look for a
+`src/somelib` folder in all of the folders in the `$GOPATH` environment
+variable. This works nicely for globally installed packages, but it makes
+encapsulating a project with a specific version, or modified version, rather
+tedious. Whenever you go to work on this project you'll have to add its path to
+your `$GOPATH`, or add the path permanently, which could break other projects
+which may use a different version of `somelib`.
+
+My solution is in the form of a simple script I'm calling go+. go+ will search
+in currrent directory and all of its parents for a file called `GOPROJROOT`. If
+it finds that file in a directory, it prepends that directory's absolute path to
+your `$GOPATH` and stops the search. Regardless of whether or not `GOPROJROOT`
+was found go+ will passthrough all arguments to the actual go call. The
+modification to `$GOPATH` will only last the duration of the call.
+
+As an example, consider the following:
+```
+/tmp
+    /hello
+        GOPROJROOT
+        /src
+            /somelib/somelib.go
+            /hello.go
+```
+
+If `hello.go` depends on `somelib`, as long as you run go+ from `/tmp/hello` or
+one of its children your project will still compile
+
+Here is the source code for go+:
+
+```bash
+#!/bin/sh
+
+SEARCHING_FOR=GOPROJROOT
+ORIG_DIR=$(pwd)
+
+STOPSEARCH=0
+SEARCH_DIR=$ORIG_DIR
+while [ $STOPSEARCH = 0 ]; do
+
+    RES=$( find $SEARCH_DIR -maxdepth 1 -type f -name $SEARCHING_FOR | \
+           grep -P "$SEARCHING_FOR$" | \
+           head -n1 )
+
+    if [ "$RES" = "" ]; then
+        if [ "$SEARCH_DIR" = "/" ]; then
+            STOPSEARCH=1
+        fi
+        cd ..
+        SEARCH_DIR=$(pwd)
+    else
+        export GOPATH=$SEARCH_DIR:$GOPATH
+        STOPSEARCH=1
+    fi
+done
+
+cd "$ORIG_DIR"
+exec go $@
+```
+
+## UPDATE: Goat
+
+I'm leaving this post for posterity, but go+ has some serious flaws in it. For
+one, it doesn't allow for specifying the version of a dependency you want to
+use. To this end, I wrote [goat][0] which does all the things go+ does, plus
+real dependency management, PLUS it is built in a way that if you've been
+following go's best-practices for code organization you shouldn't have to change
+any of your existing code AT ALL. It's cool, check it out.
+
+[0]: http://github.com/mediocregopher/goat