[TW5] Setting a field for a list of tiddlers, incrementing for each one?

[Matthew Petty]

I have a set of tiddlers, and I want to set a field for each one, incrementing the value each time.

So for example, I have tiddlers A B C D, and after running this macro or whatever, they would have the following fields:
A would have 1
B would have 2
C would have 3
D would have 4

What would be the easiest way to do that?

[Matthew Petty]

I've been looking at tobibeer's setvars plugin, to see if that would work, but I can't figure it out.

Here's some pseudocode for what I want to do.

set index to initial value
set increment amount
set required filter and sort

select list of tiddlers by the filter
for each tiddler
    set field to index value
    increment index by increment amount
next tiddler

Any help gratefully received

[Hegart Dmishiv]

Hi Matthew,

I think TobiBeer's make[ ] filter plugin might be what you're looking for.

Hegart.

[Matthew Petty]

I've looked at that, but it seems to be creating new tiddlers, and setting the titles. What I need is to take existing tiddlers and set a field.

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[Hegart Dmishiv]

Hi Matthew,

Can I confirm, do you want the name of the field itself to be incremented, or the value within a given field to be incremented? From your examples above, it looks like you want the former, is that correct?

Hegart.

[Matthew Petty]

Ah, no, apologies for the confusion. Here's what I want, in more detailed pseudocode (I'm probably using the wrong symbols):

set index=1
set increment_amount=1
set filter="[tag[this_tag]nsort[sort_order]]"

select list of tiddlers by <<filter>>
for each tiddler in list
    set field 'sort_order' to <<index>>
    increment <<index>> by <<increment_amount>>
next tiddler

One issue that I can think of is that because the filter is using the field being changed, it may affect the list when it is changed.

-MJP

[Matthew Petty]

Bump? Anyone?
I have the feeling that setvars would be useful, or calc, or action-setfield. But how to bring it together?

[Hegart Dmishiv]

Hi Matthew,

Sorry, I was working on a solution to this yesterday, but I got sidetracked. Here's a demo I've been building. It's not complete yet, and the essential ingredient is still missing, so you might not even want to waste your time with it yet. I'll let you know if/when I solve it. In the meantime, if anyone else can come up with a solution, that'd be great.

Hegart.

[Matthew Petty]

Hi Hegart,
Thank you for your efforts!
I took a look at your demo. I like the trick of using one tiddler with multiple fields for variables. Simple and elegant.

The calc plugin can be used to increment a value in a button (http://tobibeer.github.io/tb5/#calc). This increments by the incrementer value:

<$button set="$:/_Data/variables!!current-count" setTo=<<calc $:/_Data/variables!!current-count + by:$:/_Data/variables!!incrementer>>>+</$button>

So that is now a part of the pseudocode:

<$edit-text tiddler="$:/_Data/variables" field="current-count" size="5" />
<$edit-text tiddler="$:/_Data/variables" field="incrementer" size="5" />
<$edit-text tiddler="$:/_Data/variables" field="filter" size=50 />

<$list filter={{$:/_Data/variables!!filter}}>

for each tiddler in list
    set field 'sort_order' to <<current-count>>
    increment <<current-count>> by <<incrementer>>
next tiddler


It's a question of triggering an action inside a list, in such a way as to make it act like a "for" loop.

-Matthew

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[Hegart Dmishiv]

Hi Matthew,

I can't seem to get the <<calc>> macro to work at all. The only thing it seems to do for me is to delete whatever field I point it at.

Hegart.

[Matthew Petty]

It's a plugin by tobibeer. I have no problems with it - strange

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