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Not to be confused with Bash

Fash is a language where the code looks like console commands, and variables use the directory structure. The word 'Fash' is a fusion of the words 'False Bash'.


Fash has a unique way of using variables, where every variable is a file in root or a subfolder. The extension dictates the variable type, using:

File extension Variable type
.int Integer
.uint Unsigned integer
.bool Boolean
.char Character
.float Float
.*.arr Array of type *
.str or .char.arr String
.any Any type
.null Null variable
.*.ptr Pointer to variable.

Where the name of the file is the name of the variable. Using this, variables can have multiple types. You are allowed to use subfolders for variables. Variables in ./local are only usable by the subroutine that writes to them, ./temp are reset when you leave the subroutine, no matter what, and ./args are defined when a file/function/macro is run/called. In ./args, file names need to go in numerical order from 0. You are not allowed to step out of root.

RAM variables

RAM variables are a special kind of variable, that allow you to store values from files to use them. There are 8 of these, named RAM0 through RAM7. You do not have to use Read or Write to use them.


Fash has 2 types of subroutine: macros and functions. Macros are substituted in when running, and functions are jumped into and out of. Macros can use ./local variables from where they are run, but cannot have their own local variables. You can define macros and functions in .fashm and .fashf files, respectively. You are allowed to reference a function inside itself, in fact it actually has a special name: ./~.

Basic subroutines

Fash has a few basic subroutines that can be used, which can be run without a ./:

Function name Function use
Return Returns from a function. Can only be used in .fashf files.
Print Prints to the screen.
Get Gets user input
Read Get a variable from a file and store in a RAM variable.
Write Get a variable from a RAM variable and store it in a file.
Run Runs a .fashm or .fashf file and store return in a RAM variable.
Jump Jump to a specified line in the program. Second argument is condition.
Skip Jumps over the next line in the program if the condition is true
Err Throw error.
Comment Ignore line. Does count toward line total though.

.fashp and .fashl

If you zip a folder, and rename it .fashp with a main.fash, or rename it to .fashl with at least one .fashf or .fashm, you create a standalone file or function library. You can enter a function library like normal with Run ./lib.fashl/fib.fashf 4 running a fib function from the lib library with an argument of 4.


Recursive fibonacci function

├ fib.fashf
└ /args
  └ 0.uint

 READ ./args/0.uint RAM0
 JUMP 6 RAM0=0
 JUMP 6 RAM0=1
 RUN ./~ RAM1 RAM0-1
 RUN ./~ RAM2 RAM0-2

Truth machine

└ main.fash

 JUMP 1 RAM0=1