Folks,
For the intellectually or wiki text, curious, I stumbled upon the following
as a result of someone else's code
I have not yet published many wikis and plugins because I am still
exploring all the fundamental methods without resorting to javascript. This
is and example of how I overcame a serious limitation by discovering
something which is perhaps an undocumented feature. If there is a gap, I am
trying to fill it.
However I give you notice I hope to publish a large number of macros, tools
and plugins in the near future, especially to support designers and rapid
development.
Try this on tiddlywiki.com in a tiddler
<$list filter="[range[10,100,10]]">
{{!!title}}
</$list>
This seems intuitive correct but if you think about it the `{{!!title}}`
field, does not exist for the virtual tiddlers that result from this range
widget.
*Why would I care?*
- In tiddlywiki the only inbuilt way to translate a date serial number
into a date is the view widget
- eg `<$view tiddler="" $field="" format="date"
template="YYYY-0MM-0DD"/>`
- or `<$view tiddler="" $field="" format="relativedate"/>`
- Created and modified dates as fields are an exception to this rule try
{{!!created}} to see what I mean.
- *The view widget does not permit variables as inpu*t, which has being
a long time annoyance to me
- *I now have an avenue to bypass this limitation*, also observed in use
in some of JED's code
For example provide a literal date as a variable via the list, but use the
title as a field
<$list filter="[[20210506]]">
<$view field=title format="date" template="YYYY-0MM-0DD"/>
</$list>
- Not sure If I can get the relative date even with a full date serial
(yet)
Another exciting development, try this
<$list filter="[range[20210215,20210315,1]]">
<$view field=title format="date" template="YYYY-0MM-0DD"/><br>
</$list>
I am incrementing the date 2021/02/15 one day at a time until 2021/03/15
- Notice the list* only returns valid dates*
- Now you can get a list of *valid *dates
Recognises year change
<$list filter="[range[20201225,20210105,1]]">
<$view field=title format="date" template="YYYY-0MM-0DD"/><br>
</$list>
Use to convert formats
<$list filter="[[2020-12-25]split[-]join[]]"><!-- or variable,field etc -->
<$view field=title format="date" template="0DD/0MM/YYYY"/><br>
</$list>
Whilst I could use join[/] I would not reorder the values, as in this case
Other interesting and working examples
<$list filter="[range[20201201,20211201,100]]">
<$view field=title format="date" template="DDD YYYY-0MM-0DD"/><br>
</$list>
What is the day of week of the first of every month?
Adding 7 days creeps forward? Not quite right?
<$list filter="[range[20201225,20210105,7]]">
<$view field=title format="date" template="0WW DDD YYYY-0MM-0DD"/><br>
</$list>
What is happening here, whats wrong with the order, is there a work around.
*Conclusions*
- Setting currentTiddler in a list via a filter allows you to use any
filter to set a value, including a variable and *use title as the input
to the ViewWidget*.
- This opens the view widget up to any date even if it is a variable (or
any other widget with this limitation?)
- given it only returns valid dates, it is a source of a series of valid
dates taking into account the changes inherit in calendars
- It can be used to reformat any valid date even as a variable, or
generated with increments.
- A set of easy to use wikitext macros can be written to count,
generate, manipulate dates, without any plugin or JavaScript code.
*Optional challenge(s) *(for the reader)
- It could be used to generate a method of counting days between two
dates (left for the curious)
- Tip count the output?
- Used to generate date tiddlers of any format.
Regards
TW Tones
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