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* Throw an error if path failed to expand Previously, it just repeated the non-expanded path. * Allow expanding non-existent paths This commit has a strange error in examples. * Specify span manually in examples; Add an example * Expand relative path without requiring cwd * Remove redundant tilde expansion This makes the tilde expansion in relative paths dependant on "dirs" feature. * Add missing example result * Adjust path expand description * Fix import error with missing feature |
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Nu-Engine
Nu-engine handles most of the core logic of nushell. For example, engine handles: - Passing of data between commands - Evaluating a commands return values - Loading of user configurations
Top level introduction
The following topics shall give the reader a top level understanding how various topics are handled in nushell.
How are environment variables handled?
Environment variables (or short envs) are stored in the Scope of the EvaluationContext. That means that environment variables are scoped by default and we don't use std::env to store envs (but make exceptions where convenient).
Nushell handles environment variables and their lifetime the following:
- At startup all existing environment variables are read and put into
Scope. (Nushell reads existing environment variables platform independent by asking theHost. They will most likely come fromstd::env::*) - Envs can also be loaded from config files. Each loaded config produces a new
ScopeFramewith the envs of the loaded config. - Nu-Script files and internal commands read and write env variables from / to the
Scope. External scripts and binaries can't interact with theScope. Therefore all env variables are read from theScopeand put into the external binaries environment-variables-memory area.