addurl: Support --json, particularly useful in --batch mode.

Command/AddUrl.hs

@@ -41,7 +41,7 @@ import qualified Utility.Quvi as Quvi
 #endif
 
 cmd :: Command
-cmd = notBareRepo $ withGlobalOptions [jobsOption] $
+cmd = notBareRepo $ withGlobalOptions [jobsOption, jsonOption] $
 	command "addurl" SectionCommon "add urls to annex"
 		(paramRepeating paramUrl) (seek <$$> optParser)
 

debian/changelog

@@ -34,6 +34,7 @@ git-annex (6.20151219) UNRELEASED; urgency=medium
     displays in this situation. Fixed by treating files git thinks are
     modified the same as typechanged files.
   * addurl: Added --batch and --with-files options.
+  * addurl: Support --json, particularly useful in --batch mode.
   * Debian: Adjust build dependencies for webapp, DAV. Now available on
     mips, mipsel, but temporarily removed armel since build is failing
     there.

doc/bugs/inconsistent_output_upon_addurl_--batch_complicates_if_not_forbids_reliable_parsing_of_output.mdwn

@@ -19,3 +19,6 @@ failed
 """]]
 
 [[!meta author=yoh]]
+
+> I've made --json work for addurl; I feel that's the way to go for parsing
+> its output. [[done]] --[[Joey]]

doc/git-annex-addurl.mdwn

@@ -83,6 +83,11 @@ be used to get better filenames.
   content if the file does not yet exist; the same as
   `git annex addurl $url --file $file`
 
+* `--json`
+
+  Enable JSON output. This is intended to be parsed by programs that use
+  git-annex. Each line of output is a JSON object.
+
 # SEE ALSO
 
 [[git-annex]](1)