Feature flags #4940

This introduces a new type features_t that exposes feature flags. The intent is to allow a deprecation/incremental adoption path. This is not a general purpose configuration mechanism, but instead allows for compatibility during the transition as features are added/removed. Each feature has a user-presentable short name and a short description. Their values are tracked in a struct features_t. We start with one feature stderr_nocaret, but it's not hooked up yet.

This teaches the status command to work with features. 'status features' will show a table listing all known features and whether they are currently on or off. `status test-feature` will test an individual feature, setting the exit status to 0 if the feature is on, 1 if off, 2 if unknown.

This introduces a new command line option --features which can be used for enabling or disabling features for a particular fish session. Examples: fish --features stderr-nocaret fish --features 3.0,no-stderr-nocaret fish --features all Note that the feature set cannot be changed in an existing session.

This partially reverts 5b489ca, with carets acting as redirections unless the stderr-nocaret flag is set. This flag is off by default but may be enabled on the command line: fish --features stderr-nocaret

This enables users to opt in (or out) of specific features by setting the fish_features environment variable. For example `set -U fish_features stderr-nocaret` to opt into removing the caret redirection.

This adds a feature flag for controlling whether question marks are globs. It is not yet hooked up.

This partially reverts 6e56637 and fish-shell#4520 by bringing back the ? wildcard, guarded by the qmark-noglob feature flag.

This is a convenience over fish_features().test()

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Feature flags #4940

Feature flags #4940

Commits on May 6, 2018