Hi Tobias.
Is It possible to using this plugin to make conditional statement like if
{{!!foo}} >80 then print A. I am try to make gradebook using TW5. Thank you.
On Monday, December 7, 2015 at 8:00:44 AM UTC+8, Tobias Beer wrote:
>
> Hi everyone,
>
> I hereby release the new eval
> <http://tobibeer.github.io/tw5-plugins/#eval> plugin (or tobibeer/eval
> <http://tobibeer.github.io/tw5-plugins/#eval>) which provides an *eval*
> filter and an *eval* widget ...the latter working similar to the *calc*
> widget in mklauber/math.js <http://mklauber.github.io/tiddly-mathjs/>,
> however leveraging a "plug-and-play" library model (and then some).
>
> The *eval* plugin was born out of my desire (and Jeremy's suggestion) to
> overcome the constraints of let filter
> <http://let.tiddlyspot.com/#GettingStarted>, (henceforth abandoned,)
> which started out with similar aspirations, allowing to compute and compare
> with tidbits, however, somewhat at the wrong end of the stick.
>
> If you prefer to learn by example, take a look at the examples
> <http://tobibeer.github.io/tw5-plugins/#eval-Examples>.
>
> The repo and the commented, non-minified source code is at:
> https://github.com/tobibeer/tw5-eval
>
> Although quite neatly designed, thoroughly tested and refactored, I have
> flagged this release as *BETA* so as to invite you to test it, and also
> to indicate that — architecturally speaking — things might nevertheless
> still change, perhaps. With or without further modifications, I intend to
> take it out of BETA in, say, a couple of weeks.
>
> Eval is capable of evaluating expressions leveraging different libraries,
> for now supporting:
>
> - *math.js*
> - you need to separately install tobibeer/math.js
> <http://tobibeer.github.io/tw5-plugins/#math.js> which contains
> nothing but math.js <http://mathjs.org/> itself
> - and avails it at *$:/lib/math.js*
> - should you already use mklauber/math.js
> <http://mklauber.github.io/tiddly-mathjs/>, *eval* will load the
> *math.js* version it ships with
> - so there's no need to install *tobibeer/math.js*
> - *js*
> - allows to evaluate native javascript
> - needs to be specifically enabled, see configuration
> <http://tobibeer.github.io/tw5-plugins/#eval-Configure>
> - in other words, you don't even need any *math.js* if...
> - you are confident to do your math in nothing but js
> - wish to trim those resource requirements
>
> The eval filter provides the following capabilities:
>
> - a *main* expression to be evaluated, obviously ...being the operand
> - you can specify more expressions, predefined or custom
> variables, and options, all in the operand
> - separate different operand declarations via backslash (*\*),
> defined as *name:value* e.g...
> - an *init* value — initializing the *value* before taking off to
> evaluate the main expression against each input title
> - a *final* expression — a final computation after the *main *expression
> had been evaluated against the last input title
> - the *value* and *title* run-time variables — automatically set for
> each input title, for use in the *main* or *final* expression
> - a *format* option — to have math.js nicely format your output value
> - a *lib* option — to specify for each filter instance which library
> to use in order to evaluate the given expression(s)
> - custom *variables — *any name that is not a predefined variable or
> option
> - to help make your *main* or *final* expression more readable
> - the suffix — to define what to return
> - *no suffix:* returns just the final *value*
> - *output mode* suffixes, prefixed *$*, use one at a time,
> returning...
> - *$* — those input titles where value is truthy
> - *$all* — all input titles if the value is truthy for any input
> title
> - *$val* — a list of values, one for each input title
> - *$expr* — a list of expressions, one for each input title
> - *$eq* — a list of equations, one for each input title => great
> for debugging
>
> Both *text references* as well as *wikitext-variables* can be used freely
> in the operand and are substituted in any expression or variable. (*Note*:
> custom variables are only evaluated on init, not during iterations. They
> shall also not reference each other).
>
> Ok, so... hope to see you give it a test-ride and let me know what you
> think, what things may not work (as expected) but also which work just
> about right. ;-)
>
> ~
>
> For loading libraries, the *eval* plugin does some neat dependency
> resolving, the gist of which I hope will eventually find its way into the
> core, in one form or another. That way, we don't ship and install things
> like *vis* or *math.js* or any other library with any plugins that build
> on them. Nor does plugin A require plugin B, just to not duplicate a given
> library. For math.js, for example, there barely any needs for a plugin to
> depend on a given version of math.js. But even that can be catered for with
> some minor amends as to version handling / dedicated library versions
> resolved in just about the same way as *eval* does right now.
>
> Best wishes,
>
> Tobias.
>
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