--- a/Makefile	Sat Oct 12 16:38:39 2013 +0300
+++ b/Makefile	Tue Oct 15 16:13:22 2013 +0300
@@ -59,7 +59,7 @@
 ################################################################
 # Proj dirs/files.
 
-EL_FILES := $(wildcard *-mode.el) debian-doc.el
+EL_FILES := $(wildcard *-mode.el) debian-doc.el maven-central.el
 
 RST_FILES := $(wildcard *.rst)
 HTML_FILES := $(RST_FILES:.rst=.html)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/maven-central.el	Tue Oct 15 16:13:22 2013 +0300
@@ -0,0 +1,138 @@
+;;; maven-central.el --- Maven central auxility
+
+;;; Commentary:
+;;
+
+(require 'url-handlers)
+
+;;; Code:
+
+(defvar maven-central.buffer-name "*Maven Central*")
+
+(defconst maven-central.search-url "http://search.maven.org/solrsearch/select?wt=json&rows=20")
+
+(defun maven-central.callback1 (status)
+  (let ( (buffer (current-buffer)) )
+    (switch-to-buffer maven-central.buffer-name)
+    (url-insert buffer)))
+
+(defun maven-central.versions-url (groupId artifactId)
+  (concat maven-central.search-url "&core=gav&q=g:" (url-hexify-string groupId) (url-hexify-string " AND ") "a:" (url-hexify-string artifactId)))
+;; (maven-central.versions-url "junit" "junit")
+
+(defun maven-central.versions-callback (status)
+  (let ( (buffer (current-buffer)) json )
+    (with-temp-buffer
+      (url-insert buffer)
+      (beginning-of-buffer)
+      (setq json (json-read))
+      ;; (switch-to-buffer maven-central.buffer-name)
+      ;; (pp json)
+      (message "Available versions: %s" (mapconcat (lambda (json) (cdr (assq 'v json))) (cdr (assq 'docs (cdr (assoc 'response json)))) ", "))
+      )))
+
+(defun maven-central.versions (groupId artifactId)
+  "Retrieve available versions."
+  (url-retrieve (maven-central.versions-url groupId artifactId) #'maven-central.versions-callback))
+
+(defun maven-central.last-version-url (groupId artifactId)
+  (concat maven-central.search-url "&q=g:" (url-hexify-string groupId) (url-hexify-string " AND ") "a:" (url-hexify-string artifactId)))
+;; (maven-central.versions-url "junit" "junit")
+
+(defun maven-central.last-version-callback (status)
+  (let ( (buffer (current-buffer)) json )
+    (with-temp-buffer
+      (url-insert buffer)
+      (beginning-of-buffer)
+      (setq json (json-read))
+      ;; (switch-to-buffer maven-central.buffer-name)
+      ;; (pp json)
+      (message "Latest version: %s" (cdr (assq 'latestVersion (elt (cdr (assq 'docs (cdr (assoc 'response json)))) 0))))
+      )))
+
+(defun maven-central.last-version (groupId artifactId)
+  "Retrieve last package version."
+  (url-retrieve (maven-central.last-version-url groupId artifactId) #'maven-central.last-version-callback))
+
+(defun maven-central.parse-pom-dependency-in-region (start end)
+  (let (groupId artifactId version)
+    (save-restriction
+      (narrow-to-region start end)
+      (goto-char start)
+      (re-search-forward "<groupId>\\([^<]*\\)</groupId>" nil t)
+      (setq groupId (match-string-no-properties 1))
+      (goto-char start)
+      (re-search-forward "<artifactId>\\([^<]*\\)</artifactId>" nil t)
+      (setq artifactId (match-string-no-properties 1))
+      (goto-char start)
+      (re-search-forward "<version>\\([^<]*\\)</version>" nil t)
+      (setq version (match-string-no-properties 1))
+      (list groupId artifactId version)
+      )))
+
+(defun maven-central.parse-pom-dependency (&optional point)
+  (unless point
+    (setq point (point)))
+  (let (start end pos groupId artifactId version fs-o bs-o fs-c bs-c)
+    (save-excursion
+      (goto-char point)
+      (unless (eq (char-after) ?<)
+        (search-backward "<"))
+      (setq point (point))
+      (setq fs-o (re-search-forward "<\\(?:plugin\\|dependency\\)>" nil t))
+      (when fs-o
+        (setq fs-o (- fs-o 12)))
+      (goto-char point)
+      (setq bs-o (re-search-backward "<\\(?:plugin\\|dependency\\)>" nil t))
+      (goto-char point)
+      (setq fs-c (re-search-forward "</\\(?:plugin\\|dependency\\)>" nil t))
+      (goto-char point)
+      (setq bs-c (re-search-backward "</\\(?:plugin\\|dependency\\)>" nil t))
+      (when bs-c
+        (setq bs-c (+ bs-c 13)))
+      (cond
+       ((and fs-o (= fs-o point) fs-c)
+        (maven-central.parse-pom-dependency-in-region fs-o fs-c))
+       ((and bs-o (<= bs-o point) fs-c (<= point fs-c))
+        (maven-central.parse-pom-dependency-in-region bs-o fs-c))
+       ((and fs-o fs-c)
+        (maven-central.parse-pom-dependency-in-region fs-o fs-c))
+       ((and bs-o bs-c)
+        (maven-central.parse-pom-dependency-in-region bs-o bs-c))
+       (t
+        (list nil nil nil)))
+      )))
+
+(defun maven-central.parse-test (&optional point)
+  (interactive)
+  (pp (maven-central.parse-pom-dependency)) )
+
+;;;###autoload 
+(defun maven-central.last-version-from-pom ()
+  (interactive)
+  (let (dependency groupId artifactId)
+    (setq dependency (maven-central.parse-pom-dependency))
+    (setq groupId (elt dependency 0))
+    (setq artifactId (elt dependency 1))
+    (when (and groupId artifactId)
+      (maven-central.last-version groupId artifactId))
+    ))
+
+;;;###autoload 
+(defun maven-central.versions-from-pom ()
+  (interactive)
+  (let (dependency groupId artifactId)
+    (setq dependency (maven-central.parse-pom-dependency))
+    (setq groupId (elt dependency 0))
+    (setq artifactId (elt dependency 1))
+    (when (and groupId artifactId)
+      (maven-central.versions groupId artifactId))
+    ))
+
+;; (maven-central.last-version "junit" "junit")
+
+(provide 'maven-central)
+
+(provide 'maven-central)
+
+;;; maven-central.el ends here