Created
May 21, 2019 13:28
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A command line tool to infer a clojure spec from a line seq of data.
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| #!/usr/bin/env inlein | |
| '{:dependencies [[org.clojure/clojure "1.10.0"] | |
| [spec-provider "0.4.14"] | |
| [org.clojure/tools.cli "0.4.2"] | |
| [cheshire "5.8.1"]]} | |
| (require '[cheshire.core :as json]) | |
| (require '[clojure.edn :as edn]) | |
| (require '[spec-provider.provider :as sp]) | |
| (require '[clojure.string :as string]) | |
| (require '[clojure.tools.cli :refer [parse-opts]]) | |
| (defn- println-err | |
| [& args] | |
| (binding [*out* *err*] | |
| (apply println args))) | |
| (def cli-options | |
| ;; An option with a required argument | |
| [["-n" "--spec-root-key NS" "Spec root namespace." | |
| :default :my-ns/data | |
| :parse-fn #(-> % (string/replace #":" "") keyword)] | |
| ;; A boolean option defaulting to nil | |
| ["-h" "--help"]]) | |
| (defn- read-json | |
| [s {:keys [verbose] | |
| :or {verbose false}}] | |
| (try | |
| (json/parse-string s keyword) | |
| (catch com.fasterxml.jackson.core.JsonParseException e | |
| (when verbose | |
| (println-err (format "ERROR: reading json [%S]" | |
| (.getMessage e) | |
| s))) | |
| ::error))) | |
| (defn- read-edn | |
| [s {:keys [verbose] | |
| :or {verbose false}}] | |
| (try | |
| (edn/read-string s) | |
| (catch java.lang.RuntimeException e | |
| (when verbose | |
| (println-err (format "ERROR: reading edn [%S] parsing: %s" | |
| (.getMessage e) | |
| s))) | |
| ::error))) | |
| (defn- input-format | |
| [s] | |
| (cond | |
| (not (= ::error (read-json s {}))) ::json | |
| (not (= ::error (read-edn s {}))) ::edn | |
| true ::error)) | |
| (let [opts (parse-opts *command-line-args* cli-options)] | |
| (when-not (empty? (:errors opts)) | |
| (doseq [e (:errors opts)] | |
| (println-err e)) | |
| (System/exit 23)) | |
| (when (get-in opts [:options :help]) | |
| (println-err (:summary opts)) | |
| (System/exit 0)) | |
| (let [input (line-seq (java.io.BufferedReader. *in*)) | |
| first-line (first input) | |
| _ (println-err "Detecting input format from first line.") | |
| in-fmt (input-format first-line) | |
| _ (println-err (format "Parsing lines as %s." (name in-fmt))) | |
| root-k (get-in opts [:options :spec-root-key]) | |
| dataset (map (fn [line] | |
| (case in-fmt | |
| ::json (read-json line {:verbose true}) | |
| ::edn (read-edn line {:verbose true}) | |
| ::error (do | |
| (println-err "Unknown format. Giving up!") | |
| (System/exit 12)))) | |
| input) | |
| _ (println-err (format "Inferring spec from a dataset of %d entries." (count dataset)))] | |
| ;(println-err (prn-str opts)) | |
| ;(println-err (prn-str root-k)) | |
| ;(println-err (prn-str dataset)) | |
| (sp/pprint-specs | |
| (sp/infer-specs dataset root-k) | |
| (symbol (namespace root-k)) | |
| 's) | |
| (println-err "Done!"))) |
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