gEDA-dev: PCB Library regression

[DJ Delorie]

> If the generator were to have a list of footprints provided by the
> script, would it have to modify ListLibraryContents.sh to enumerate its
> (possibly dynamic) list of footprints as well?

PCB uses two separate programs, one for extracting and one for
listing.  The two programs are QueryLibrary.sh (lib-command) and
ListLibraryContents.sh (lib-contents-command).

$ pcb -h 2>&1 | grep command
 --font-command <string>       
 --file-command <string>        Command to read a file.
 --element-command <string>    
 --lib-command-dir <string>    
 --lib-command <string>        
 --lib-contents-command <string>
 --save-command <string>       
 --rat-command <string>        
 --save-last-command           
 --lprcommand <string>          Command to print

Defaults are in src/main.c:

  SSET (LibraryCommand, "QueryLibrary.sh '%p' '%f' %a",
	"lib-command", 0),
  SSET (LibraryContentsCommand, "ListLibraryContents.sh '%p' '%f'",
	"lib-contents-command", 0),