Rewrite without regex crate.
The regex approach was broken. If the following _content_ was provided
in the entry:
foo
---
bar
The regex approach parsed the header until the "---" in the content.
This is, of course, not the way to do that.
Now, the parsing is implemented by hand. Should be faster as well,
though I don't care about this.
This fixes a severe bug.
This patch adds API functions in the StoreIdIteratorWithStore iterator
type to transform it into a iterator which _does_ something (as in the
`libimagstore::iter` API).
It mimics the API which is offered by `libimagstore::iter`.
This test is not applicable anymore because it tests (and tested) the
wrong thing.
It was to check whether the function failed because the "imag" key
contained the wrong type, but this is not tested by that function. The
function only checks whether the "imag" key is present.
Before we extracted the store configuration from the configuration
toml::Value object and passed it to the store.
This is unecessary overhead.
Now we pass the whole configuration object and let the store extract the
required values.
Before the iterator did also yield storeids for directories, which was a
bug.
This change introduces a new if_file() function in the store-internal
backend, which is needed to check whether a path actually points to a
File, be it inmemory or on the real filesystem.
That's because tests might fail if they check via PathBuf::is_file() as
in tests, the entries only exist inmemory.
From the documentation of Walkdir::min_depth():
Set the minimum depth of entries yielded by the iterator.
The smallest depth is 0 and always corresponds to the path given to
the new function on this type. Its direct descendents have depth 1,
and their descendents have depth 2, and so on.
This means that when we started with "/tmp/store", we end up yielding
that exact path in the first iteration. This is exactly what we do _not_
want.
Setting the minimal depth to 1 fixes this bug.
