https://github.com/antonlydike/functionalshell

some common helpers in functional programming to help you do more with your shell
https://github.com/antonlydike/functionalshell

Last synced: 23 days ago
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some common helpers in functional programming to help you do more with your shell

• Host: GitHub
• URL: https://github.com/antonlydike/functionalshell
• Owner: AntonLydike
• Created: 2021-02-17T13:38:41.000Z (almost 4 years ago)
• Default Branch: main
• Last Pushed: 2021-02-17T13:52:45.000Z (almost 4 years ago)
• Last Synced: 2024-10-30T11:49:34.399Z (2 months ago)
• Language: Shell
• Size: 1.95 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# functional programming for shell scripts

This tool aims to provide functional programming basics like map, reduce, fold, zip etc for shells

Example: `du * | cut -f 1 | reduce (lambda x y : 'math $y + $x')` here we sum over all file sizes using a lambda and the reduce function.

## install

### fish:

include `set -ax fish_function_path /path/to/this/repo/src/fish` somewhere in your fish init

## Available functions:

`` can is always a list of zero or more arguments

### map 

Usage: `map CMD `

call `FUNCTION $ARG` for each arg supplied

### coalesce

Usage: `coalesce `

prints first non null argument

### reduce

Usage: `reduce CMD [--start=] `

Reduce the list: `x0 = start || ""` and `x_n+1 = (CMD $x_n $arg_n)`

### zip

Usage `zip [--cmd=CMD]  [ --  [ --  [...]]]`

`CMD` defaults to `echo`

Returns `CMD $list1_i $list2_i ...` for each entry in the lists. If the list is empty the argument will be an empty string

### lambda

Usage: `lambda   ... : `

Examples: 

```

# create lambda function and save reference to it

set add (lambda x y : 'math $y + $x')

# call it

$add 1 2

# use it

reduce $add (seq 10)

# immediate usage

reduce (lambda x y : 'math $y + $x') (seq 10)

```

### curry

Usage: `curry cmd `

[curries](https://en.wikipedia.org/wiki/Currying) `cmd` with `list`.