[tw5] Re: how to make a link list finding all tiddlers with a certain field and sorting them by that field content

[Eric Shulman]

On Thursday, August 27, 2020 at 2:48:05 AM UTC-7, Sapphireslinger wrote:
>
> When I finish reading a book, what is the most elegant way to mark it as 
> read?


There are LOTS of ways to do this.  For this reply, let's just use the 
method you described...
 

> *list ... all tiddlers possessing the field "finished-reading-date" ... 
> and sort them by that field ...* *sort under year headings (and) month 
> headings?*
>
*They are already tagged with the year I finished reading them (i.e 2020) 
> and the month (i.e August).*


Here's a set of nested <$list> widgets to show the "Reading History":
<$list filter="[range[2018,2021]]" variable="year">
   <$list filter="[tag<year>limit[1]]">
      <<year>><br>
      <$list 
filter="[range[1,12]addprefix[$:/language/Date/Long/Month/]get[text]]" 
variable="month">
         <$list filter="[tag<year>tag<month>limit[1]]">
            &emsp;<<month>><br>
            <$list filter="[tag<year>tag<month>
has[finished-reading-date]sort[finished-reading-date]]">
               &emsp;&emsp;<$link /> (<$view 
field="finished-reading-date"/>)<br>
            </$list>
         </$list>
      </$list>
   </$list>
</$list>

Notes:
* Line 1: $list iterates over a set of years using range[start,end] (adjust 
start and end values to fit your data)
* Line 2: $list checks to see if at least 1 tiddler is tagged with that year
* Line 3: displays the year
* Line 4: $list iterates over a set of month names using range[1,12], 
getting the month names from the TWCore shadows
* Line 5: $list checks to see if at least 1 tiddler is tagged with that 
year and month
* Line 6: displays the month, indented by &emsp; (an "em" space character)
* Line 7: $list finds all tiddlers with the year and month tags that also 
have a "finished-reading-date" field, and sorts by that field
* Line 8: displays a link to the matching tiddler and the value of the 
"finished-reading-date" field, indented by two $emsp;
* Lines 9-13: close the $list widgets

enjoy,
-e

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