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manual: remove "Writing Nix Expressions" chapter

Browse source 
it is out of date, all over the place in level of detail, is really
about `nixpkgs`, and in general instructions should not be part of
a reference manual.

also:
- update redirects and internal links
- use "Nix language" consistently
This commit is contained in:
Valentin Gagarin 2022-08-04 11:36:32 +02:00
parent 075bf6e556
commit 499ed26508
25 changed files with 124 additions and 543 deletions
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doc/manual/src/expressions/builtin-constants.md
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# Built-in Constants
Here are the constants built into the Nix expression evaluator:
- `builtins`\
The set `builtins` contains all the built-in functions and values.
You can use `builtins` to test for the availability of features in
the Nix installation, e.g.,
```nix
if builtins ? getEnv then builtins.getEnv "PATH" else ""
```
This allows a Nix expression to fall back gracefully on older Nix
installations that don’t have the desired built-in function.
- [`builtins.currentSystem`]{#builtins-currentSystem}\
The built-in value `currentSystem` evaluates to the Nix platform
identifier for the Nix installation on which the expression is being
evaluated, such as `"i686-linux"` or `"x86_64-darwin"`.