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* stdlib/path-test.tl (path-volume): Don't return
:abs for a path whose empty first component
isn't followed by any more items. Otherwise
we return :abs for a path formed by splitting
the empty string, and then calls like (rel-path "" "a")
complain about a mixture of absolute and relative.
With this change, empty paths given to rel-path
behave as if they were ".".
* tests/018/rel-path.tl: New test cases.
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* share/txr/stdlib/copy-file.tl: When removing .. components,
a dotdot must only cancel preceding non-dotdot. We must check
not only that the out stack is not empty but that the top
element isn't dotdot. Also, eliminate empty components, like
the documentation says. Lastly, we must check for the impossible
cases, when the from path uses .. components that are
impossible to navigate backwards to form a relative path.
* tests/018/rel-path.tl: Test cases added.
* txr.1: Updated with additional descriptions, fixes and
examples.
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* lisplib.c (copy_file_set_entries): Add rel-path as autoload
trigger for copy-file module.
* share/txr/stdlib/copy-file.tl (rel-path): New function.
* tests/018/rel-path.tl: New file.
* txr.1: Documented.
* share/txr/stdlib/doc-syms.tl: Updated.
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