Allow overriding preferences in CLI arguments. #251
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There's no reason we'd want multiple copies of the default settings, so the defaults can be easily extracted into a static variable to clean everything up a bit.
Instead, this patch uses Yaml::Null to indicate an empty options set. Doing things this way cuts down on around 50 lines of code by keeping most of the searching logic in `yaml-rust`'s domain.
The `value` function computes the value associated with a given key for a given filename and extension. This was function was liberally to reduce the repeated logic in the code, and *slightly modifies behavior*, though in a backwards-compatible way. Some settings were only customizeable when declared at a global level in the config file, which may now be specified at the extension/filename level. This does not (yet) apply to some of the more complicated settings like `line_length_guide`: see the diff for mor details.
Rather than keeping the theme in a one-off structure entry, index it with the rest of the preferences values in a Yaml tree. This relies on a fork of `yaml-rust` which provides mutable acccess.
Utilise `borrowed_or` in my yaml-rust fork to shorten the logic.
Applies to getters: + line_comment_prefix + syntax_definition_name
This allows for the configuration to specify a line length guide depending on the file type, for instance, 80 characters everywhere, but 72 in .git/COMMIT_EDITMSG. Note that this changes the Preferences public API, so there are a fair few modifications, including to unit tests.
This implements a simple argument parser that isolates 'direct' arguments (paths, etc) from `--key value` options, and treats the argument --help specially to display a usage message. For instance, the invocation `amp --key value src` would launch amp in the directory src with the option key set to value. Options are not currently used. This commit makes it impossible to pass a file beginning with `--` as a CLI argument: it will be assumed to be an option.
This allows specifying, for instance, `amp <file> --line_length_guide 72` to override any value given in settings. This is done through a change in Application's constructor, allowing the provision of overrides. Because of this change, roughly 80-ish tests had to be modified to pass in empty overrides (thus the long diff).
Cargo.lock had some merge conflicts. This manual merge used cargo to regenerate Cargo.lock (`rm Cargo.lock && cargo build`).
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This patchset allows starting Amp as, for instance (
amp --line_length_guide 72 /tmp/file). This is particularly useful in cases where an application creates a temporary file with no identifying extension and opens it in a user-configured editor (for instance, as mutt handles composing email).There are substantial changes to the preferences module to support this change; see the earlier commits for everything that changed there. The weirdest thing about the changes is that my fork of yaml-rust is used to make the code a bit nicer (chyh1990/yaml-rust#179), but other than that I think it's all mostly standard stuff. Refactors could probably go a bit further, but I think it's okay as is.
Also note that in resolving merge conflicts, I just regenerated Cargo.lock, so some dependencies are on slightly later versions (no breaking changes afaict, though).