First, a bit of history: the code you quoted in your post is for TiddlyWiki
Classic ("TWC"). The current version of TiddlyWiki ("TW" or "TW5") was
completely re-written from the ground up several years ago to take
advantage of modern browser tech such as HTML5. Additionally, in TWC,
writing programmatic manipulations of tiddlers required either javascript
programming or use of extra "plugins" to provide the needed syntax while in
TW5, much of the programmatic syntax is provided natively within the TWCore.
Now... on to your specific question. You wrote:
> I would first filter the tiddlers by tag and then execute the batch edit
> on this group. What I want to do is to put something at the begining of
> each tiddler's tiddler (like adding prefix) without changing the rest of
> the tittle. So in the end each tiddler will have the same prefix but
> different rest of the title.
To "filter tiddlers by tag", use the <$list> widget, like this:
<$list filter="[tag[sometag]]">
</$list>
The <$list> widget uses the filter to find all the matching tiddlers and
then loops through all the matches and sets the value of the
<<currentTiddler>> variable to each title, in turn. By default, the
<$list> widget will simply output the value of the <<currentTiddler>>
resulting in the display of titles of all the matching tiddlers. To make
the widget do something else, you need to add more syntax *within* the
enclosing <$list>...</$list> that references the <<currentTiddler>>
variable to act on each tiddler (e.g., setting a specified field value in
the <<currentTiddler>>)
For example, if you wanted to add/update a field named "matched" to "true",
you would use the <$action-setfield> widget, like this:
<$list filter="[tag[sometag]]">
<$action-setfield $tiddler=<<currentTiddler>> matched="true"/>
</$list>
However, the above code is NOT enough to get the job done. Because the
<$action-setfield> widget changes stored tiddler values, it requires a
user-initiated "trigger" event to start the process. To achieve this, you
can enclose the above <$list>...</$list> loop within a <$button> widget,
like this:
<$button>
BUTTON TEXT
<$list filter="[tag[sometag]]">
<$action-setfield $tiddler=<<currentTiddler>> matched="true"/>
</$list>
</$button>
So... for your use-case, you might think that the code would be something
like:
<$button>
BUTTON TEXT
<$list filter="[tag[sometag]]">
<$action-setfield $tiddler=<<currentTiddler>> title="...NEW TITLE
HERE..." />
</$list>
</$button>
However... there are a few tricky details to consider:
First, tiddler *titles* are not just display text, but are used to uniquely
identify each tiddler. Thus, changing a title actually *copies* the
existing tiddler content (all fields) to another tiddler with the specified
new title and "renaming" a tiddler actually takes TWO actions: first change
the title (creating a new tiddler), and then delete the tiddler with the
old title, like this:
<$button>
BUTTON TEXT
<$list filter="[tag[sometag]]">
<$action-setfield $tiddler=<<currentTiddler>> title="..." />
<!-- CREATES NEW TIDDLER -->
<$action-deletetiddler $tiddler=<<currentTiddler>> /> <!-- REMOVES
OLD TIDDLER -->
</$list>
</$button>
The next problem is that TW5 syntax does not do direct text manipulation
"in line", so assembling the desired new title (i.e., prepending some text
to the beginning of the existing title) requires use of a little "helper"
macro, like this:
\define newTitle(prefix) $prefix$$(currentTiddler)$
This macro takes one parameter, "prefix". The value of the parameter is
rendered into the output using the $...$ syntax (i.e., "$prefix$"). The
value of the current tiddler title is already available as a variable
defined in the calling scope, and is referenced using the $(...)$.
Putting it together, we get:
\define newTitle(prefix) $prefix$$(currentTiddler)$
<$button>
BUTTON TEXT
<$list filter="[tag[SOMETAG]]">
<$action-setfield $tiddler=<<currentTiddler>> title=<<newTitle
"SOMEPREFIX">> />
<$action-deletetiddler $tiddler=<<currentTiddler>> />
</$list>
</$button>
While this works, it would be nicer if we didn't "hard code" the button
label, tag to match and the prefix to be added. To do this we can move the
<$button> definition into a macro, and then invoke the macro, passing in
the desired values, like this:
\define newTitle(prefix) $prefix$$(currentTiddler)$
\define addPrefix(label,tag,prefix)
<$button>
$label$
<$list filter="[tag[$tag$]]">
<$action-setfield $tiddler=<<currentTiddler>> title=<<newTitle
"$prefix$">> />
<$action-deletetiddler $tiddler=<<currentTiddler>> />
</$list>
</$button>
\end
<<addPrefix "ClickMe!" "sometag" "SomePrefix">>
That should do it. Let me know how it goes.
enjoy,
-e
Eric Shulman
TiddlyTools.com: "Small Tools for Big Ideas!" (tm)
InsideTiddlyWiki: The Missing Manuals
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