Also replace (*Frame).OutputChan with (*Frame).ValueOutput, which returns a
small interface for writing to the value output that is also aware when the
reader is gone.
This also replaces the slightly awkward "arguments here" reason with
"argument count" as the "what" for a typical errs.ArityMismatch
exception. It also reformats most of the constructors so that the "what"
is on the same line. This makes `grep errs.ArityMismatch **.go` more
useful as a result.
This implements `&dedup` and `&newest-first` options for
`edit:command-history`. This makes it noticably cheaper to feed unique
command history into external commands like `fzf`.
Related #1053Fixes#568
* Introduce the `path:` module
This is based on https://github.com/elves/elvish/pull/1084 by @kolbycrouch
submitted five months ago. It addresses all of the feedback on that
change and includes other documentation and unit test improvements. It
also includes a couple of extensions to the original P.R., such as a
`path:is-abs` command.
I decided to resurrect that change because I want better support for
filesystem path manipulation so that users can replace non-portable
external commands such as `realpath` and `find` with Elvish builtins. This
is a baby step towards that goal.
Related #849
* Add a `path:is-regular` command
This adds a `path:is-regular` command. This is for symmetry with the
`path:is-dir` command and the glob `[type:regular]` modifier.
It also adds support for symlinks in the `testutil.Applydir` function
and change the path unit test to use it.
* Rename path:real to path:eval-symlinks
- Make Evaler mostly thread-safe. The only remaining thread-unsafe part is the
modules field, which is more tricky than other fields.
- Remove the state and evalerScopes type, and move their fields into Evaler.
- Expose valuePrefix via a get method, and change PortsFromFiles to take the
prefix instead of a *Evaler. Also expose a PortsFromStdFiles.
- Make Evaler a normal field of Frame, instead of an embedded field. This makes
access to global states more explicit.
* Fields may now be exposed via getter methods.
* Field names are automatically converted to dashed-case.
* Assoc behavior is no longer implemented for structmaps.
* The IsStructMap marker method no longer takes a special marker argument. There
is a little danger of a value accidentally implementing this method.
