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Another one. This is the end for today.

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Charles Haley 2022-07-04 14:36:55 +01:00
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manual/template_lang.rst
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@ -439,7 +439,7 @@ In `GPM` the functions described in `Single Function Mode` all require an additi
template:"program: series_only_one_book()#@#:n:1"
Using a stored template instead of putting the template into the search eliminates problems caused by the requirement to escape quotes in search expressions.
* ``book_values(column, query, sep, use_vl)`` -- returns a list of the unique values contained in the column ``column`` (a lookup name), separated by ``sep``, in the books found by searching for ``query``. If ``use_vl`` is ``0`` (zero) then virtual libraries are ignored. This function and its companion `book_count()`` are particularly useful in template searches, supporting searches that combine information from many books such as looking for series with only one book. It cannot be used in composite columns unless the tweak ``allow_template_database_functions_in_composites`` is set to True. It can be used only in the GUI.
* ``book_values(column, query, sep, use_vl)`` -- returns a list of the unique values contained in the column ``column`` (a lookup name), separated by ``sep``, in the books found by searching for ``query``. If ``use_vl`` is ``0`` (zero) then virtual libraries are ignored. This function and its companion ``book_count()`` are particularly useful in template searches, supporting searches that combine information from many books such as looking for series with only one book. It cannot be used in composite columns unless the tweak ``allow_template_database_functions_in_composites`` is set to True. It can be used only in the GUI.
* ``booksize()`` -- returns the value of the calibre 'size' field. Returns '' if there are no formats.
* ``check_yes_no(field_name, is_undefined, is_false, is_true)`` -- checks if the value of the yes/no field named by the lookup name ``field_name`` is one of the values specified by the parameters, returning ``'yes'`` if a match is found otherwise returning the empty string. Set the parameter ``is_undefined``, ``is_false``, or ``is_true`` to 1 (the number) to check that condition, otherwise set it to 0. Example: