Hi guys,
I'm a little new to tiddlywiki, and find some functionalities don't work as
I thought, including macro call and transclusion.
The background is that I have a DataTiddler, which stores the baseurl of
the site (when published); let's call this `dt##baseurl`. I have a feed
plugin installed to generate atom feed, under `/atom.xml`, relative to the
baseurl. (Some may suspect I intend to make this site like a blog, and you
are right.)
When I need to concatenate these two pieces of text together, as mentioned
elsewhere (e.g. official site), I need to use a helper macro to establish
the real concatenation of transclusion and string literal. (But I still
don't know why... Is this because of the processing engine's execution
order / lifecycle?)
I succeeded to do this when using text as the visible content, through
`[[$text$|$baseurl$/atom.xml]]`.
However, when I want to create a image which links to the atom feed, I find
no solution.
I have to use `<a href=... >[img[MY_IMG]]</a>` for this to work (LinkWidget
will link to tiddler only; `[[]]` syntax only works on text). But if I
apply the previous trick, neither of the follow methods work.
Method 1:
```
\define atomfeed(burl) $burl$/atom.xml
<a href=<$macrocall $name=atomfeed burl={{dt##baseurl}}
/>>[img[MY_IMG]]</a>
```
The $macrocall widget won't really work, and the resulting line is broken.
I guess this is because of the `/>`.
Method 2:
```
\define atomfeed(burl) $burl$/atom.xml
<a href=<<atomfeed {{dt##baseurl}}>>>[img[MY_IMG]]</a>
```
The macro will be evaluated, but the transclusion won't, resulting in a
link to "{{dt##baseurl}}/atom.xml".
Method 3:
```
\define atomfeed(burl) $burl$/atom.xml
\define wrapatomfeed() <$macrocall $name=atomfeed burl={{dt##baseurl}} />
<a href=<<wrapatomfeed>>>[img[MY_IMG]]</a>
```
The macro will be evaluated once, but the second macrocall won't be
evaluated at all.
I also tried a few other combinations of these methods (e.g. replace the
3rd method's wrap macro content to `<< >>`), but none of them worked.
Anyone has any ideas?
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