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Originally Posted by Noughty
Like what ','), 0, ',') this part means and similar?
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Those are parameters to the function identified by the ( ) pairs and are documented for each function.
The function syntax of template programs is similar to what one finds in excel and similar programs. The functions are different, but the way the functions are written and used are not. Calibre's function syntax is
documented here. The functions are
documented here.
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#textmult is my custom column? As I cannot find "textmult" in template guide.
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'#textmult', the parameter to the field() function, is the name of my column that I used to test the template. I don't have a column named #shelf.
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At the moment I have:
{#shelf:'merge_lists(field('tags'), $, ',')'}
And in this I don't understand what $ does. Basically I would like some basics of the language, symbols and their meaning etc.
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Quoting the manual
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the variable $ stands for the field the expression is operating upon, #series in this case.
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In your case the $ stands for #shelf.
That template is using
template program mode and consists of two functions, merge_lists() (obsolete, replaced by list_union) that uses the result (return value) of field() as its first parameter. $ is the second parameter to merge_lists, and ',' is the third parameter.