FEU

File Edition Utility

(Fun fact: Feu mean fire in French)

FEU is a sed-like utility making heavy use of regexs.

Syntax

Each line is a command.

Commands are in this form:

mode/arg1/arg2/.../argN

A line can also be a keyword:

• end End a block
• loop Start an infinite loop
• line Execute a block for each line of the input
• print Print the input
• do number Execute a block a specified number of times
• func name Define a function
• call name Call a function
• __DATA__ The rest of the file is the input to the program

Mode	Command format	Description
	/regex/flags	Execute the next block for each strings matched by the regex
substitute	s/regex/sub/flags	Replace each occurence of a regex in the input
exit	e/regex/flags	Exit the current block if the input is matched by the regex (effect can be negated by adding the ! flag)
map	m/regex1/sub1/regex2/sub2/.../regexN/subN/flags	Same as s, but using a mapping
append	a/text	Append text at the end of the input (equivalent to s/$/text)
prepend	p/text	Prepend text at the start of the input (equivalent to s/^/text)
unary	u/character	Convert the input from decimal to unary using a specified character (the sign is ignored)
Unary	U/character	Convert the input from unary to decimal with a specified unary character
ignore	i/text	Comment
Shell	S/command/arg1/arg2/.../argN	Execute a shell command
Extended	ecommand	Execute an extended command

Extended commands:

Mode	Command format	Description
set	s/var/regex/flags	Set a variable to the portions of the input matched by the regex
push	p/var	Push the current input on the input stack and set the input to the specified variable
Pop	p/var	Set the variable to the current input and set the input to the value on the top of the input stack
undefine	u/var	Undefine a variable
append	a/var	Append the content of a variable at the end of the input
prepend	p/var	Prepend the content of a variable at the start of the input

Examples

See the examples folder