Solved. In fact, the solution was so simple I'm worried it's a trap! I have
created a new filter operator -- enlistallowduplicates -- which differs
from enlist by a single parameter.
Here is the non-comment part of enlist.js:
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
/*
Export our filter function
*/
exports.enlist = function(source,operator,options) {
var list = $tw.utils.parseStringArray(operator.operand);
if(operator.prefix === "!") {
var results = [];
source(function(tiddler,title) {
if(list.indexOf(title) === -1) {
results.push(title);
}
});
return results;
} else {
return list;
}
};
})();
Here is the non-comment part of enlistallowduplicates.js with the added
parameter bolded/italicised/underlined:
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
/*
Export our filter function
*/
exports.enlistallowduplicates = function(source,operator,options) {
var list = $tw.utils.parseStringArray(operator.operand,*true*);
if(operator.prefix === "!") {
var results = [];
source(function(tiddler,title) {
if(list.indexOf(title) === -1) {
results.push(title);
}
});
return results;
} else {
return list;
}
};
})();
This works because $tw.utils.parseStringArray is already defined with a
second boolean parameter called AllowDuplicates which, unsurprisingly,
causes the return value (a list) to include duplicates. The new operator --
enlistallowduplicates -- also respects the double-square-brackets
convention. So, this meets all my criteria for a drop-in replacement for
enlist that allows duplicates.
I checked the definition of $tw.utils.parseStringArray in version
5.1.20-prerelease (it's in boot/boot.js) and it remains unchanged, so this
solution should survive the next upgrade (unless these parts change between
now and then).
My thanks to everyone who responded to my question, and especially to Mark
S. who nudged me toward a replacement filter operator.
Regards,
David.
On Friday, 26 April 2019 05:35:54 UTC+9:30, Mark S. wrote:
>
>
> It turns out that I wrote an "enlist2" filter in 2017 that can split on
> spaces without duplication. Unfortunately, this means your tiddler titles
> can't have spaces. I can imagine an enhanced version that could split on [[
> ]] as well.
>
> https://groups.google.com/d/msg/tiddlywiki/KzDgSIrPOXI/IWsqXamwBQAJ
>
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