fix --help to show --formatter-preset and possible options (#1830)

Co-authored-by: http://jneen.net/ <[email protected]>

lib/rouge/cli.rb

@@ -174,35 +174,38 @@ def self.doc
         yield %[usage: rougify highlight <filename> [options...]]
         yield %[       rougify highlight [options...]]
         yield %[]
-        yield %[--input-file|-i <filename>  specify a file to read, or - to use stdin]
+        yield %[--input-file|-i <filename>   specify a file to read, or - to use stdin]
         yield %[]
-        yield %[--lexer|-l <lexer>          specify the lexer to use.]
-        yield %[                            If not provided, rougify will try to guess]
-        yield %[                            based on --mimetype, the filename, and the]
-        yield %[                            file contents.]
+        yield %[--lexer|-l <lexer>           specify the lexer to use.]
+        yield %[                             If not provided, rougify will try to guess]
+        yield %[                             based on --mimetype, the filename, and the]
+        yield %[                             file contents.]
         yield %[]
-        yield %[--formatter|-f <opts>       specify the output formatter to use.]
-        yield %[                            If not provided, rougify will default to]
-        yield %[                            terminal256.]
+        yield %[--formatter-preset|-f <opts> specify the output formatter to use.]
+        yield %[                             If not provided, rougify will default to]
+        yield %[                             terminal256. options are: terminal256,]
+        yield %[                             terminal-truecolor, html, html-pygments,]
+        yield %[                             html-inline, html-line-table, html-table,]
+        yield %[                             null/raw/tokens, or tex.]
         yield %[]
-        yield %[--theme|-t <theme>          specify the theme to use for highlighting]
-        yield %[                            the file. (only applies to some formatters)]
+        yield %[--theme|-t <theme>           specify the theme to use for highlighting]
+        yield %[                             the file. (only applies to some formatters)]
         yield %[]
-        yield %[--mimetype|-m <mimetype>    specify a mimetype for lexer guessing]
+        yield %[--mimetype|-m <mimetype>     specify a mimetype for lexer guessing]
         yield %[]
-        yield %[--lexer-opts|-L <opts>      specify lexer options in CGI format]
-        yield %[                            (opt1=val1&opt2=val2)]
+        yield %[--lexer-opts|-L <opts>       specify lexer options in CGI format]
+        yield %[                             (opt1=val1&opt2=val2)]
         yield %[]
-        yield %[--formatter-opts|-F <opts>  specify formatter options in CGI format]
-        yield %[                            (opt1=val1&opt2=val2)]
+        yield %[--formatter-opts|-F <opts>   specify formatter options in CGI format]
+        yield %[                             (opt1=val1&opt2=val2)]
         yield %[]
-        yield %[--require|-r <filename>     require a filename or library before]
-        yield %[                            highlighting]
+        yield %[--require|-r <filename>      require a filename or library before]
+        yield %[                             highlighting]
         yield %[]
-        yield %[--escape                    allow the use of escapes between <! and !>]
+        yield %[--escape                     allow the use of escapes between <! and !>]
         yield %[]
-        yield %[--escape-with <l> <r>       allow the use of escapes between custom]
-        yield %[                            delimiters. implies --escape]
+        yield %[--escape-with <l> <r>        allow the use of escapes between custom]
+        yield %[                             delimiters. implies --escape]
       end
 
       # There is no consistent way to do this, but this is used elsewhere,