Don't allow weight to be "auto" in front-matter for per-file exports

Fixes #83

Makefile

@@ -1,4 +1,4 @@
-# Time-stamp: <2017-09-26 14:20:42 kmodi>
+# Time-stamp: <2017-09-28 10:05:44 kmodi>
 
 # Makefile to export org documents to md for Hugo from the command line
 # Run just "make" to see usage examples.
@@ -44,7 +44,8 @@ subtree_test_files = all-posts.org \
 
 file_test_files = single-posts/post-toml.org \
 	single-posts/post-yaml.org \
-	single-posts/post-draft.org
+	single-posts/post-draft.org \
+	single-posts/hugo-auto-weight-ineffective-for-per-file-exports.org
 
 # Cannot run tests on the following files, because:
 # - auto-set-lastmod.org - the lastmod field will always get updated.

doc/content/doc/org-meta-data-to-hugo-front-matter.md

@@ -56,4 +56,5 @@ Hugo front-matter (TOML)         | Org
 
 -   The auto weight calculation for posts and menu items works **only**
     for subtree exports. For the complete-file export flow, one needs to
-    specify the weights manually if needed.
+    specify the weights manually. The value of _weight_ set to `"auto"`
+    will be equivalent to _nil_ for the complete-file export flow.

doc/github-files.org

@@ -5,6 +5,7 @@
 #+MACRO: travis [[https://travis-ci.org/kaushalmodi/ox-hugo][https://travis-ci.org/kaushalmodi/ox-hugo.svg?branch=master]]
 #+MACRO: melpa [[https://melpa.org/#/ox-hugo][file:https://melpa.org/packages/ox-hugo-badge.svg]]
 #+MACRO: GPLv3 [[https://www.gnu.org/licenses/gpl-3.0][https://img.shields.io/badge/License-GPL%20v3-blue.svg]]
+#+MACRO: gitter [[https://gitter.im/KaushalModi/Lobby][https://badges.gitter.im/KaushalModi/Lobby.svg]]
 
 * Readme                                                             :readme:
 :PROPERTIES:

doc/ox-hugo-manual.org

@@ -701,7 +701,8 @@ set.
 ***** Notes
 - The auto weight calculation for posts and menu items works *only*
   for subtree exports. For the complete-file export flow, one needs to
-  specify the weights manually if needed.
+  specify the weights manually. The value of /weight/ set to ="auto"=
+  will be equivalent to /nil/ for the complete-file export flow.
 *** Formatting
 :PROPERTIES:
 :EXPORT_FILE_NAME: formatting

ox-hugo.el

@@ -1331,7 +1331,9 @@ INFO is a plist used as a communication channel."
                                         org-hugo--subtree-coord)))
                    (if auto-calc
                        (org-hugo--calc-weight)
-                     wt)))
+                     (unless (and (stringp wt) ;Don't allow weight to be "auto" if auto-calc is nil.
+                                  (string= wt "auto"))
+                       wt))))
          (menu-alist (org-hugo--parse-menu-prop-to-alist (plist-get info :hugo-menu)))
          (menu-alist-override (org-hugo--parse-menu-prop-to-alist (plist-get info :hugo-menu-override)))
          ;; If menu-alist-override is non-nil, update menu-alist with values from that.

test/site/content-org/single-posts/hugo-auto-weight-ineffective-for-per-file-exports.org

@@ -0,0 +1,10 @@
+#+TITLE: Hugo auto weight ineffective for per-file exports
+#+HUGO_BASE_DIR: ../../
+#+HUGO_WEIGHT: auto
+#+HUGO_TAGS: weight
+
+Even though we have =#+HUGO_WEIGHT: auto= in this file, the weight
+will be treated as nil as this file is exported using the /per-file/
+or /complete-file/ export flow.
+
+The auto-weight calculation works *only* for /per-subtree/ flow.

test/site/content/posts/hugo-auto-weight-ineffective-for-per-file-exports.md

@@ -0,0 +1,11 @@
++++
+title = "Hugo auto weight ineffective for per-file exports"
+tags = ["weight"]
+draft = false
++++
+
+Even though we have `#+HUGO_WEIGHT: auto` in this file, the weight
+will be treated as nil as this file is exported using the _per-file_
+or _complete-file_ export flow.
+
+The auto-weight calculation works **only** for _per-subtree_ flow.