CODEWITHSUNDEEP
clojurewritefileline-by-line
Joseph Yourine
Joseph Yourine

Reputation: 1331

How can I write an EDN line by line? (spit, seq of hashmaps)

I have data like that 

tab = ({"123" data} {"456" data} ...

(whatever, it is a lazy sequence of hashmaps).

I want to write it into an edn file line by line, so I did this 

(map (fn[x] (spit "test.edn" x :append true)) tab)

The problem is that I would like to have this in the file :

{"123" data}
{"456" data}

But it seems to append like that 

{"123" data}{"456" data}

Is there a way to solve this ? I guess I have to add "newline" but I don't know how to do it since inputs are not strings.

Thanks !

Upvotes: 1

Views: 1847

Answers (2)

Sam Estep
Sam Estep

Reputation: 13294

(doseq [x tab]
  (spit "test.edn" (prn-str x) :append true))

So, for each item in tab, convert it to a readable string followed by a newline, then append that string to test.edn.

You should not use map for this for a couple of reasons:

  1. map is lazy and therefore will not print the entire sequence unless you force it
  2. map retains the head of the sequence, which would simply waste memory here

Upvotes: 3

Joseph Yourine
Joseph Yourine

Reputation: 1331

Sorry, I finally found it, hope it will help some people beauce I did not find it in the internet (I mean no simple answer).

(map (fn[x] (spit "test.edn" (str x "\n") :append true)) tab)

Good afternoon.

Upvotes: 1

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