diff -r 3685e2321a9b -r 06937ff1ec5f mylisp/maven.el
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mylisp/maven.el	Sat Jan 02 00:33:04 2021 +0200
@@ -0,0 +1,140 @@
+;;; maven.el --- Maven build project helpers.
+
+;;; Commentary:
+;;
+
+;;; Code:
+
+(defvar maven-command "mvn")
+
+(defvar maven/help-buffer-name "*Maven Help*")
+
+(defun maven/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/parse-pom-dependency (&optional point)
+  (let (start end pos groupId artifactId version fs-o bs-o fs-c bs-c)
+    (save-excursion
+      (if (looking-at "[^>]*<[^!]")
+          (progn (search-forward "<") (backward-char))
+        (search-backward "<"))
+      (setq point (point))
+      (when (re-search-forward "<\\(?:plugin\\|dependency\\)>" nil t)
+        (setq fs-o (re-search-backward "<" nil t)))
+      (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)
+      (when (re-search-backward "</\\(?:plugin\\|dependency\\)>" nil t)
+        (setq bs-c (re-search-forward ">" nil t)))
+      (cond
+       ((and fs-o (= fs-o point) fs-c)
+        (maven/parse-pom-dependency-in-region fs-o fs-c))
+       ((and bs-o (<= bs-o point) fs-c (<= point fs-c))
+        (maven/parse-pom-dependency-in-region bs-o fs-c))
+       ((and fs-o fs-c)
+        (maven/parse-pom-dependency-in-region fs-o fs-c))
+       ((and bs-o bs-c)
+        (maven/parse-pom-dependency-in-region bs-o bs-c))
+       (t
+        (list nil nil nil)))
+      )))
+;; (pp (maven/parse-pom-dependency))
+
+;;;###autoload
+(defun maven-help ()
+  "Run help:describe for plugin at point."
+  (interactive)
+  (let (dependency groupId artifactId)
+    (setq dependency (maven/parse-pom-dependency))
+    (setq groupId (elt dependency 0))
+    (setq artifactId (elt dependency 1))
+    (if (not (and groupId artifactId))
+        (message "Can't find `groupId' or `artifactId'")
+      (shell-command
+       (format "%s help:describe -Ddetail -DgroupId=%s -DartifactId=%s" maven-command groupId artifactId)
+       (switch-to-buffer maven/help-buffer-name)) )
+    ))
+
+;;;###autoload
+(defun maven-effective-pom ()
+  "Run help:effective-pom for plugin at point."
+  (interactive)
+  (shell-command
+   (format "%s help:effective-pom" maven-command)
+   (switch-to-buffer maven/help-buffer-name)) )
+
+;;;###autoload
+(defun maven-effective-settings ()
+  "Run help:effective-settings for plugin at point."
+  (interactive)
+  (shell-command
+   (format "%s help:effective-settings" maven-command)
+   (switch-to-buffer maven/help-buffer-name)) )
+
+;;;###autoload
+(defun maven-dependency-tree ()
+  "Run dependency:tree for plugin at point."
+  (interactive)
+  (shell-command
+   (format "%s dependency:tree" maven-command)
+   (switch-to-buffer maven/help-buffer-name)) )
+
+(defun maven/project-root ()
+  "Root of project."
+  (let ( (dir default-directory) (found nil) )
+    (while (and (not found) (> (length dir) 5))
+      (when (file-exists-p (concat dir "/pom.xml"))
+        (setq found dir))
+      (setq dir (expand-file-name (concat dir "/.."))))
+    found))
+
+(defun maven/file-package ()
+  "Return file package."
+  (save-excursion
+    (goto-char (point-min))
+    (let (pkg cls)
+      (re-search-forward "package +\\([[:alnum:]_.]+\\) *;" nil t)
+      (setq pkg (match-string-no-properties 1))
+      (re-search-forward "class\\s +\\([[:alnum:]_]+\\)\\(\\s \\|\n\\|implements [^{]*\\|extents [^{]*\\)*{" nil t)
+      (setq cls (match-string-no-properties 1))
+      (when (and pkg cls)
+        (concat pkg "." cls))) ))
+
+;;;###autoload
+(defun maven-run-file ()
+  "Run exec:java for current file."
+  (interactive)
+  (let* ( (default-directory (concat (maven/project-root) "/")) )
+    (if (not default-directory)
+        (message "Can't find maven project root")
+      (compilation-start
+       (format "%s exec:java -Dexec.mainClass=%s" maven-command (maven/file-package))))))
+
+;;;###autoload
+(defun maven-run-test ()
+  "Run test -Dtest=... for current file."
+  (interactive)
+  (let* ( (default-directory (concat (maven/project-root) "/")) )
+    (if (not default-directory)
+        (message "Can't find maven project root")
+      (compilation-start
+       (format "%s test -Dtest=%s" maven-command (maven/file-package))))))
+
+(provide 'maven)
+
+;;; maven.el ends here