Clojurians Log v2

Hey guys, I just made this thing https://github.com/fp-alice/cljmcs Aside from not having any tests, am I doing anything wrong?

this could be expressed as (set/rename-keys x {:download :file :href :location}) https://github.com/fp-alice/cljmcs/blob/master/src/cljmcs/http/scraper.clj#L11

never seen that function before, good tip

subjectively, sometimes (first (filter f coll)) is better than constructing a predicate that returns its input so you can use some https://github.com/fp-alice/cljmcs/blob/master/src/cljmcs/minecraft/servers.clj#L16

the predicate there could be (comp #{minecraft-version} :version) - returns truthy if the value under the key matches any value in the set

(that's also subjective)

How does that work?

i understand compose

a keys is a function from a map to the value under the key

a set is a function from a potential member to itself only if contained in the set

(#{foo} foo) -> foo

Oh so it's like getting the version and then checking if it's equal to the given one with the set

(#{foo baz} bar) -> nil

right

I always read comp backwards

yeah, if the devs in your team (you) don't find that straightforward, it's probably a bad style choice

but it's an idiom I personally like

I love function composition I just always have to read the sexps twice

you use http://clojure.java.io here already, so you could use io/file, but you could also import java.io.File so that you can just use File https://github.com/fp-alice/cljmcs/blob/master/src/cljmcs/os/files.clj#L15

this could be clojure.string/join https://github.com/fp-alice/cljmcs/blob/master/src/cljmcs/os/files.clj#L8

oops, io/file makes sense

that too

the portable version of this is (System/getProperty "user.dir") https://github.com/fp-alice/cljmcs/blob/master/src/cljmcs/os/shell.clj#L8

If I want to make it work on windows too I'll keep that in mind thanks for the tip

an extra "print-generic-help" type thing as the odd numbered element at the end of the case will make more sense to the user than the runtime error clojure gives if no case is matched https://github.com/fp-alice/cljmcs/blob/master/src/cljmcs/core.clj#L14

well, the getProperty is also a single method call, instead of a chain of functions as well

good point

thanks for the criticism it's really valuable to me 🙂

it's all my opinions so far, no bugs

in fact this

(if action
      (case action
        "download" (download-command/download! arguments)
        "list"     (list-command/list! (first arguments))
        "help"     (help-command/help!))
      (help-command/help!))))

Didn't think of that

or for style you could differentiate the help output from unmatched by adding a prefixing "no matching command"

Whenever I look at (comp f g h), I tend to see #(f (g (h ...))). Of course if you transform it to #(-> ... f g h) it will seem backwards.