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README.md
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## Usage
Type lambda expressions into the prompt, and Lamb will evaluate them. \
Use your `\` (backslash) key to type a `λ`. \
To define macros, use `=`. For example,
@@ -30,22 +31,30 @@ To define macros, use `=`. For example,
Note that there are spaces in `λa.a F T`. With no spaces, `aFT` will be parsed as one variable. \
Lambda functions can only take single-letter, lowercase arguments. `λA.A` is not valid syntax. \
Unbound variables (upper and lower case) that aren't macros will become free variables. Free variables will be shown with a `'`, like `a'`.
Free variables will be shown with a `'`, like `a'`.
Be careful, macros are case-sensitive. If you define a macro `MAC` and accidentally write `mac` in the prompt, `mac` will become a free variable.
Macros are case-sensitive. If you define a macro `MAC` and accidentally write `mac` in the prompt, `mac` will become a free variable.
Numbers will automatically be converted to Church numerals. For example, the following line will reduce to `T`.
```
==> 3 NOT F
```
If an expression takes too long to evaluate, you may interrupt reduction with `Ctrl-C`.
If an expression takes too long to evaluate, you may interrupt reduction with `Ctrl-C`. \
Exit the prompt with `Ctrl-C` or `Ctrl-D`.
There are many useful macros in [macros.lamb](./macros.lamb). Load them with the `:load` command:
```
==> :load macros.lamb
```
Have fun!
-------------------------------------------------
## Commands
Lamb comes with a few commands. Prefix them with a `:`
Lamb understands many commands. Prefix them with a `:` in the prompt.
`:help` Prints a help message
@@ -59,8 +68,10 @@ Lamb comes with a few commands. Prefix them with a `:`
`:clearmacros` Delete all macros
`:save [filename]`\
`:load [filename]` Save or load the current environment to a file. The lines in a file look exactly the same as regular entries in the prompt, but must only contain macro definitions.
`:save [filename]` \
`:load [filename]` \
Save or load macros from a file.
The lines in a file look exactly the same as regular entries in the prompt, but can only contain macro definitions. See [macros.lamb](./macros.lamb) for an example.
-------------------------------------------------