--export has no default value anymore.

If --export had a default value, it would have to be called with
--export=FORMAT or -eFORMAT, while it was previously possible to call
it with --export FORMAT or -e FORMAT. This is counter-intuitive and
not backwards-compatible, so I reverted the change.

remwharead.1.adoc

@@ -15,7 +15,7 @@ remwharead - Saves URIs of things you want to remember in a database
 
 *remwharead* [*-t* _tags_] [*-N*] _URI_
 
-*remwharead* *-e* [_format_] [*-f* _file_] [*-T* _start_,_end_] [[*-s*|*-S*] _expression_]
+*remwharead* *-e* _format_ [*-f* _file_] [*-T* _start_,_end_] [[*-s*|*-S*] _expression_]
 
 == DESCRIPTION
 
@@ -36,7 +36,7 @@ Add tags to _URI_, delimited by commas.
 
 *-e* _format_, *--export* _format_::
 Export to _format_. Possible values are _csv_, _asciidoc_, _bookmarks_ or
-_simple_ (default). See _FORMATS_.
+_simple_. See _FORMATS_.
 
 *-f* _file_, *--file* _file_::
 Save output to _file_. Default is stdout.

src/parse_options.cpp

@@ -43,7 +43,7 @@ const options parse_options(const int argc, const char *argv[])
         popl::OptionParser op("Available options");
         op.add<popl::Value<string>>
             ("t", "tags", "Add tags to URI, delimited by commas.", "", &tags);
-        auto option_export = op.add<popl::Implicit<string>>
+        auto option_export = op.add<popl::Value<string>>
             ("e", "export", "Export to format.", "simple", &format);
         op.add<popl::Value<string>>
             ("f", "file", "Save output to file.", "", &opts.file);
@@ -70,7 +70,7 @@ const options parse_options(const int argc, const char *argv[])
         {
             cout << "Usage: " << argv[0] << " [-t tags] [-N] URI\n"
                  << "       " << argv[0]
-                 << " -e [format] [-f file] [-T start,end] "
+                 << " -e format [-f file] [-T start,end] "
                  << "[[-s|-S] expression]\n";
             cout << op;
             return options(0);