From b1f5f7fbaf04126a580d556607ea273940eacb00 Mon Sep 17 00:00:00 2001
From: Thanh Vuong <thanhvg@gmail.com>
Date: Sun, 18 Aug 2019 22:31:54 -0600
Subject: wip prototype

---
 TODOs.org   | 11 +++++++++++
 hnreader.el | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+)

diff --git a/TODOs.org b/TODOs.org
index 491f55e..480852f 100644
--- a/TODOs.org
+++ b/TODOs.org
@@ -6,3 +6,14 @@ also the data layout is already available at hn webiste, one curl call and
 then parse them to org would be faster
 * parse front page
 now what 
+* parse comments
+          <table border="0" class='comment-tree'>
+            <tr class='athing comtr ' id='20724657'>
+comment are same level in regard to html node 
+but child comments have different ident block width
+
+top level comment
+                    <td class='ind'><img src="s.gif" height="1" width="0"></td>
+child 
+
+                    <td class='ind'><img src="s.gif" height="1" width="40"></td>
diff --git a/hnreader.el b/hnreader.el
index 4863402..57e8047 100644
--- a/hnreader.el
+++ b/hnreader.el
@@ -18,6 +18,12 @@
   "Get hn commnet buffer."
   (get-buffer-create hn--comment-buffer))
 
+(defvar hnreader--indent 40
+  "Tab value which is the width of an indent.
+top level commnet is 0 indent
+second one is 40
+third one is 80.")
+
 (defun hnreader--promise-dom (url)
   "Promise (url . dom) from URL with curl."
   (promise-new
@@ -70,6 +76,40 @@
       (cl-mapcar #'hnreader--print-frontpage-item things subtexts)
       (org-mode))))
 
+(defun hnreader--print-comments (dom)
+  "Print DOM comment page to buffer."
+  (let ((comments (dom-by-class  dom "^athing comtr $")))
+    (with-current-buffer (hnreader--get-hn-comment-buffer)
+      (read-only-mode -1)
+      (erase-buffer)
+      (dolist (comment comments)
+        ;; (setq thanh comment)
+        (insert (format "%s %s\n"
+                        (hnreader--get-indent
+                         (hnreader--get-img-tag-width comment))
+                        (hnreader--get-comment-owner comment)
+                        ))
+        (shr-insert-document (hnreader--get-comment comment))))))
+
+(defun hnreader--get-img-tag-width (comment-dom)
+  "Get width attribute of img tag in COMMENT-DOM."
+  (string-to-number
+   (dom-attr (dom-by-tag (dom-by-class comment-dom "^ind$") 'img)
+             'width)))
+
+(defun hnreader--get-indent (width)
+  "Return headline star string from WIDTH of img tag."
+  (let ((stars "\n*")) (dotimes (_ (round (/ width hnreader--indent)) stars)
+                        (setq stars (concat stars "*")))))
+
+(defun hnreader--get-comment-owner (comment-dom)
+  "Return user who wrote this COMMENT-DOM."
+  (dom-text (dom-by-class comment-dom "^hnuser$")))
+
+(defun hnreader--get-comment (comment-dom)
+  "Get comment dom from COMMENT-DOM."
+  (dom-by-class comment-dom "^commtext"))
+
 (defun hnreader-frontpage ()
   "Testing."
   (hnreader--prepare-buffer (hnreader--get-hn-buffer))
@@ -79,4 +119,12 @@
     (promise-catch (lambda (reason)
                      (message "catch error in promise prontpage: %s" reason)))))
 
+(defun hnreader-comment (comment-id)
+  "Print hn COMMENT-ID page to buffer."
+  (hnreader--prepare-buffer (hnreader--get-hn-comment-buffer))
+  (promise-chain (hnreader--promise-dom (format "https://news.ycombinator.com/item?id=%s" comment-id))
+    (then #'hnreader--print-comments)
+    (promise-catch (lambda (reason)
+                     (message "catch error in promise comments: %s" reason)))))
+
 (provide 'hnreader)
-- 
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