• The expand_macros.pl script allows you to get a list of all macros and where they are defined (in order to have macros defined in the c++ source included as well, you may specify the path to your Greenstone source directory; see the usage information of the script for details):

  expand_macros.pl -s '.*'

• get definition of _query:pagescriptextra_

  expand_macros.pl _query:pagescriptextra_

output:

*** macro: query:pagescriptextra ***

 * query:pagescriptextra [v=0] (/usr/local/gsdl/stable/macros/query.dm, line 68)
   { _If_("_cgiargqt_" eq "1", _formpagescriptextra_, _selectpagescriptextra_) _If_("_cgiarghd_" ne "0",_historypagescriptextra_) } }
 

• get macros that are used by _query:pagescriptextra_ ('-s' for short output, omit for display of definitions; '-d' for depth, increase to see more levels):

  expand_macros.pl -s -d 2 _query:pagescriptextra_

output:

*** macro: query:pagescriptextra ***

 * query:pagescriptextra [v=0] (/usr/local/gsdl/stable/macros/query.dm, line 68)
   * query:formpagescriptextra [v=0] (/usr/local/gsdl/stable/macros/query.dm, line 76)
     * query:formfunctions [v=0] (/usr/local/gsdl/stable/macros/query.dm, line 178)
     * query:searchfunctions [v=0] (/usr/local/gsdl/stable/macros/query.dm, line 478)
     * preferences:standardfunctions [v=0] (/usr/local/gsdl/stable/macros/pref.dm, line 82)
     * query:standardfunctions [v=0] (/usr/local/gsdl/stable/macros/query.dm, line 143)
   * query:historypagescriptextra [v=0] (/usr/local/gsdl/stable/macros/query.dm, line 101)
   * query:selectpagescriptextra [v=0] (/usr/local/gsdl/stable/macros/query.dm, line 71)
     * query:dummypagescriptextra [v=0] (/usr/local/gsdl/stable/macros/query.dm, line 72)
     * query:formpagescriptextra [v=0] (/usr/local/gsdl/stable/macros/query.dm, line 76)

• get macros that use "any" _pagescriptextra_ ('-r' for reverse search):

  expand_macros.pl -r _pagescriptextra_

output:

*** macro: pagescriptextra (reverse) ***

 * Style:globalscripts [v=0] (/usr/local/gsdl/stable/macros/style.dm, line 142)
   { <script> <!-- _imagescript_ _pagescriptextra_ // --> </script> } }

 * homepref:pagescriptextra [v=0] (/usr/local/gsdl/stable/macros/home.dm, line 198)
   { _preferences:pagescriptextra_} }

• get macros whose definitions contain "blank.gif" (a search in the definition contents will be performed if the argument doesn't start, and end, with an underscore (actually, it's a bit more complicated, but that should suffice for the moment); is actually treated as full perl regular expression):

  expand_macros.pl "blank.gif"

output:

*** query: blank.gif ***

 * collector:iconblank [v=0] (/usr/local/gsdl/stable/macros/collect.dm, line 42)
   { <img src="_httpimg_/blank.gif">} }

• get a macro that is defined in the c++ code (you need to extract a greenstone source archive and point to its base location, either via the '–source' parameter or via a GSDLSOURCE environment variable):

  expand_macros.pl --source=/usr/local/gsdl/src/stable/ _collector:pagescriptextra_

output:

*** macro: collector:pagescriptextra ***

 * collector:pagescriptextra [v=0] (SERVER: /usr/local/gsdl/src/stable/src/src/recpt/collectoraction.cpp, line 1058)
   { "_" + collector_page + "scriptextra_" }

• additionally, you can use expand_macros.pl to explore macros interactively ('-i' or '-b' for "interactive", or "browse", mode)

  expand_macros.pl -i
</code
output:
  <code>
   entered 'expand_macros.pl' in ***interactive browse mode*** (v0.22)
 [you can get help at any time by typing '.h', '.?', or '.help']

 enter macro name (without package specification) [leave empty to quit]
 > pagescriptextra
   
 select package for macro 'pagescriptextra' [leave empty to return]
   [1]    Style
   [2]    browse
   [3]    collector
   [4]    homepref
   [5]    preferences
   [6]    query
 > 6

 * query:pagescriptextra [v=0] (/usr/local/gsdl/stable/macros/query.dm, line 68)
 { _If_("_cgiargqt_" eq "1", _formpagescriptextra_, _selectpagescriptextra_)
 _If_("_cgiarghd_" ne "0",_historypagescriptextra_) } }

 [press key to continue]

 select macro [leave empty to return]
   [1]    formpagescriptextra
   [2]    historypagescriptextra
   [3]    selectpagescriptextra
 > 1

 select package for macro 'formpagescriptextra' [leave empty to return]
  [1]    query 
 > 1

 * query:formpagescriptextra [v=0] (/usr/local/gsdl/stable/macros/query.dm, line 76)
 { // query scripts generated by \_query:pagescriptextra\_
 _standardfunctions_
 _formfunctions_
 _searchfunctions_
 function getsearchargs () \{
   var args="";
   args = "&fqa=0&fqv="+argfqv+"&fqf="+argfqf;
  _If_(_cgiargqf_,args += "&fqk="+argfqk+"&fqs="+argfqs+"&fqc="+argfqc;)
 return args;
 \}
 function getqueryargs () \{
   return "&fqa=1"+"&q="+argq+"&fqv="+argfqv+"&fqf="+argfqf+
     "&fqk="+argfqk+"&fqs="+argfqs+"&fqc="+argfqc ;
 \}
 } }

 [press key to continue]

 select macro [leave empty to return]
  [1]    formfunctions
  [2]    searchfunctions
  [3]    standardfunctions
 >

 select package for macro 'formpagescriptextra' [leave empty to return]
  [1]    query
 >

 select macro [leave empty to return]
  [1]    formpagescriptextra
  [2]    historypagescriptextra
  [3]    selectpagescriptextra
 >

 select package for macro 'pagescriptextra' [leave empty to return]
  [1]    Style
  [2]    browse
  [3]    collector
  [4]    homepref
  [5]    preferences
  [6]    query
 >

 enter macro name (without package specification) [leave empty to quit]
 >

Thanks to Jens Wille