functional-shell

Use map and filter in your shell.

This tool was written for learning and is not optimized for speed or compatibility.

Tested with Zsh and Bash 3/4/5.

Examples

$ find .
./README.md
./Makefile

$ find . | map abspath
/Users/simon/repos/functional-shell/README.md
/Users/simon/repos/functional-shell/Makefile

$ find . | map abspath | map basename
README.md
Makefile

$ find . | map prepend 'file: '
file: ./README.md
file: ./Makefile

$ find . | filter contains md
./README.md

$ find . | filter contains md | map abspath
/Users/simon/repos/functional-shell/README.md

$ seq 3 | map add 100
101
102
103

Installation

Run the install.sh to clone the repo and move the files to /usr/local/lib and /usr/local/bin.

$ /bin/bash <(curl -s https://raw.githubusercontent.com/simeg/functional-shell/master/install.sh)

Operations

File and Directory operations

abspath             :: Path   → Path
dirname             :: Path   → Path
basename            :: Path   → Path
is_dir              :: Path   → Bool
is_file             :: Path   → Bool
is_link             :: Path   → Bool
is_executable       :: Path   → Bool
exists              :: Path   → Bool
has_ext ext         :: Path   → Bool
strip_ext           :: Path   → String
replace_ext new_ext :: Path   → Path
split_ext           :: Path   → Array

Logical operations

non_empty           :: *      → Bool

Arithmetic operations

add num             :: Int    → Int
sub num             :: Int    → Int
mul num             :: Int    → Int
even                :: Int    → Bool
odd                 :: Int    → Bool
pow num             :: Int    → Int

Comparison operations

eq other            :: *      → Bool
equal other         :: *      → Bool
equals other        :: *      → Bool
ne other            :: *      → Bool
not_eq other        :: *      → Bool
not_equals other    :: *      → Bool
ge i                :: Int    → Bool
greater_equals i    :: Int    → Bool
gt i                :: Int    → Bool
greater_than i      :: Int    → Bool
le i                :: Int    → Bool
less_equals i       :: Int    → Bool
lt i                :: Int    → Bool
less_than i         :: Int    → Bool

String operations

reverse             :: String → String
append suffix       :: String → String
strip               :: String → String
substr start end    :: String → String
take count          :: String → String
to_lower            :: String → String
to_upper            :: String → String
replace old new     :: String → String
prepend prefix      :: String → String
capitalize          :: String → String
drop count          :: String → String
split delimiter     :: String → Array
duplicate           :: String → Array
contains substring  :: String → Bool
starts_with pattern :: String → Bool
ends_with pattern   :: String → Bool
len                 :: String → Int
length              :: String → Int

Other operations

id                  :: *      → *
identity            :: *      → *