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Split packages into hpath{,-io,-filepath}
2020-01-04 16:52:21 +00:00
# HPath libraries
Update README
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Add build status badge to main README
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Add travis icon to README
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Split packages into hpath{,-io,-filepath}
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Set of libraries to deal with filepaths and files.
Improve the ‘README.md’ file Here I copied the blog post announcing the library, because it describes it very well, and not everyone who discovers the library will know where to look for such a comprehensive description. http://chrisdone.com/posts/path-package I've made two edits to that post to reflect new things: 1. On line 123 there is a mention of ‘fromAbsDir’ and other similar functions. 2. On line 363 I've put a link to my ‘path-io’ package that provides well-typed interface to ‘directory’ and ‘temporary’. I've written the package for my personal needs, because I was tired of the endless conversion and I wanted things like recursive copying of directories. When I published it, someone opened an issue asking to add some functions from Stack's ‘Path.IO’ — that's what I'm going to do. I expect it will be able to replace ‘Path.IO’ in Stack soon. I've talked to Stack maintainers and they like the package and have nothing against the switch.
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## Motivation
Split packages into hpath{,-io,-filepath}
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* filepaths should be type-safe (absolute, relative, ...)
* filepaths should be ByteString under the hood, see [Abstract FilePath Proposal (AFPP)](https://gitlab.haskell.org/ghc/ghc/wikis/proposal/abstract-file-path)
* file high-level operations should be platform-specific, exception-stable, safe and as atomic as possible
Fork chrisdone's path library I wasn't happy with the way it dealt with Dir vs File things. In his version of the library, a `Path b Dir` always ends with a trailing path separator and `Path b File` never ends with a trailing path separator. IMO, it is nonsensical to make a Dir vs File distinction on path level, although it first seems nice. Some of the reasons are: * a path is just that: a path. It is completely disconnected from IO level and even if a `Dir`/`File` type theoretically allows us to say "this path ought to point to a file", there is literally zero guarantee that it will hold true at runtime. So this basically gives a false feeling of a type-safe file distinction. * it's imprecise about Dir vs File distinction, which makes it even worse, because a directory is also a file (just not a regular file). Add symlinks to that and the confusion is complete. * it makes the API oddly complicated for use cases where we basically don't care (yet) whether something turns out to be a directory or not Still, it comes also with a few perks: * it simplifies some functions, because they now have guarantees whether a path ends in a trailing path separator or not * it may be safer for interaction with other library functions, which behave differently depending on a trailing path separator (like probably shelly) Not limited to, but also in order to fix my remarks without breaking any benefits, I did: * rename the `Dir`/`File` types to `TPS`/`NoTPS`, so it's clear we are only giving information about trailing path separators and not actual file types we don't know about yet * add a `MaybeTPS` type, which does not mess with trailing path separators and also gives no guarantees about them... then added `toNoTPS` and `toTPS` to allow type-safe conversion * make some functions accept more general types, so we don't unnecessarily force paths with trailing separators for `(</>)` for example... instead these functions now examine the paths to still have correct behavior. This is really minor overhead. You might say now "but then I can append filepath to filepath". Well, as I said... we don't know whether it's a "filepath" at all. * merge `filename` and `dirname` into `basename` and make `parent` be `dirname`, so the function names match the name of the POSIX ones, which do (almost) the same... * fix a bug in `basename` (formerly `dirname`) which broke the type guarantees * add a pattern synonym for easier pattern matching without exporting the internal Path constructor
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Split packages into hpath{,-io,-filepath}
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## Projects
Add examples to README
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Improve README
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* [![Hackage version](https://img.shields.io/hackage/v/hpath.svg?label=Hackage)](https://hackage.haskell.org/package/hpath) [hpath](./hpath): Support for well-typed paths
* [![Hackage version](https://img.shields.io/hackage/v/hpath-filepath.svg?label=Hackage)](https://hackage.haskell.org/package/hpath-filepath) [hpath-filepath](./hpath-filepath): ByteString based filepath manipulation (can be used without hpath)
Add/update READMEs
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* [![Hackage version](https://img.shields.io/hackage/v/hpath-directory.svg?label=Hackage)](https://hackage.haskell.org/package/hpath-directory) [hpath-directory](./hpath-directory): Hhigh-level IO operations for files/directories on raw ByteString filepaths (use hpath-io for the type-safe path version)
* [![Hackage version](https://img.shields.io/hackage/v/hpath-io.svg?label=Hackage)](https://hackage.haskell.org/package/hpath-io) [hpath-io](./hpath-io): High-level IO operations for files/directories utilizing type-safe Path
Split hpath-directory into hpath-posix
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* [![Hackage version](https://img.shields.io/hackage/v/hpath-posix.svg?label=Hackage)](https://hackage.haskell.org/package/hpath-posix) [hpath-posix](./hpath-posix): Some low-level POSIX glue code that is not in 'unix'