Tess4J crashed on MacOs, but basics seem to work

src/clj/ireadit/nrepl.clj

@@ -1,4 +1,6 @@
-(ns ireadit.nrepl
+(ns ^{:doc "Meme transcriber: command line support"
+      :author "Simon Brooke"}
+  ireadit.nrepl
   (:require [nrepl.server :as nrepl]
             [clojure.tools.logging :as log]))
 

src/clj/ireadit/routes/services.clj

@@ -1,45 +1,22 @@
 (ns ireadit.routes.services
   (:require [ring.util.http-response :refer :all]
+            [cemerick.url :refer (url-decode)]
             [compojure.api.sweet :refer :all]
+            [ireadit.tesseractor :refer [ocr]]
             [schema.core :as s]))
 
 (def service-routes
   (api
-    {:swagger {:ui "/swagger-ui"
-               :spec "/swagger.json"
-               :data {:info {:version "1.0.0"
-                             :title "Sample API"
-                             :description "Sample Services"}}}}
-    
-    (context "/api" []
-      :tags ["thingie"]
-      
-      (GET "/plus" []
-        :return       Long
-        :query-params [x :- Long, {y :- Long 1}]
-        :summary      "x+y with query-parameters. y defaults to 1."
-        (ok (+ x y)))
+   {:swagger {:ui "/swagger-ui"
+              :spec "/swagger.json"
+              :data {:info {:version "1.0.0"
+                            :title "Sample API"
+                            :description "Sample Services"}}}}
 
-      (POST "/minus" []
-        :return      Long
-        :body-params [x :- Long, y :- Long]
-        :summary     "x-y with body-parameters."
-        (ok (- x y)))
+   (context "/api" []
+            :tags ["tesseractor"]
 
-      (GET "/times/:x/:y" []
-        :return      Long
-        :path-params [x :- Long, y :- Long]
-        :summary     "x*y with path-parameters"
-        (ok (* x y)))
-
-      (POST "/divide" []
-        :return      Double
-        :form-params [x :- Long, y :- Long]
-        :summary     "x/y with form-parameters"
-        (ok (/ x y)))
-
-      (GET "/power" []
-        :return      Long
-        :header-params [x :- Long, y :- Long]
-        :summary     "x^y with header-parameters"
-        (ok (long (Math/pow x y)))))))
+            (POST "/ocr/:uri" []
+                  :return       String
+                  :path-params [uri :- String]
+                  (ocr (url-decode uri))))))

src/clj/ireadit/tesseractor.clj

@@ -0,0 +1,65 @@
+(ns ^{:doc "Meme transcriber: actual OCR interface"
+      :author "Simon Brooke"}
+  ireadit.tesseractor
+  (:require [clojure.java.io :as io]
+            [clojure.tools.logging :as log]
+            [ireadit.config :refer [env]])
+  (:import net.sourceforge.tess4j.Tesseract
+           java.io.File
+           java.net.URL
+           javax.imageio.ImageIO))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;
+;;;; ireadit.tesseractor: actual OCR interface.
+;;;;
+;;;; This program is free software; you can redistribute it and/or
+;;;; modify it under the terms of the GNU General Public License
+;;;; as published by the Free Software Foundation; either version 2
+;;;; of the License, or (at your option) any later version.
+;;;;
+;;;; This program is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;;; GNU General Public License for more details.
+;;;;
+;;;; You should have received a copy of the GNU General Public License
+;;;; along with this program; if not, write to the Free Software
+;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+;;;; USA.
+;;;;
+;;;; Copyright (C) 2016 Simon Brooke for Radical Independence Campaign
+;;;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;;; Cribbed partly from https://github.com/hugoArregui/tesseract-clojure
+
+;; (def tesseract-data-dir "/usr/share/tessdata")
+;; (def language "eng")
+;; (def test-file "eurotext.png")
+
+(defn prepare-tesseract [data-path]
+  (let [t (Tesseract.)]
+    (.setDatapath t data-path)
+    t))
+
+
+(def tesseractor (prepare-tesseract (:tess-data env)))
+
+(defn ocr
+  "Perform optical charactor representation on `imgage` using the OCR engine
+  `t`, assuming the ISO 639-3 language `lang`, and return any text found as a
+  string. `image` may be supplied as a `File`, as `BufferedImage`, or as a
+  string, in which case it will be treated as a URL."
+  ([image]
+   (ocr image tesseractor))
+  ([image t]
+   (ocr image t "eng"))
+  ([image t lang]
+   (let [img (if
+               (string? image)
+               (ImageIO/read (URL. image))
+               image)]
+   (.setLanguage t lang)
+   (.doOCR t img))))
+

src/cljs/ireadit/events.cljs

@@ -36,7 +36,7 @@
 (rf/reg-event-fx
  :fetch-transcription
  (fn [{db :db} _]
-   (let [uri (str "http://loriner.journeyman.cc:8888/v1/tesseract/" (url-encode (:url db)))]
+   (let [uri (str "/api/ocr/" (url-encode (:url db)))]
      (js/console.log
       (str
        "Fetching transcription data: " uri))