ago

If you are a gopher, you wrote a AWK script for some task.

$ awk '{if $1>10 {print}}' some.txt
awk: syntax error at source line 1
 context is
	{if >>>  $ <<< 1>10 {print}}
$

Ago is an alternative AWK for gophers.

$ ago '{if $1>10 {print}}' some.txt
15 You are a gopher!!
$

Installation

$ go get -u github.com/tesujiro/ago

Examples

$ echo A Long Time Ago | ago '{print "Hello, ",$NF,"!"}'
Hello, Ago !
$ printf "AAA\nBBB\nAAA\DDD" | ago '/A+/{++N};END{print N}'
2
$ printf "AAA\nAAA\nDDD\nDDD\n" | ago '!A[$0]++'
AAA
DDD
$ echo AAA BBB CCC AAA ZZZ AAA CCC | ago '{ for i=1; i<=NF; i++{ COUNT[$i]++ }} END{for (key in COUNT){ print key, COUNT[key] }}'
AAA 3
BBB 1
CCC 2
ZZZ 1
$ printf 'aaa,bbb,"ccc,ddd\neeee"\n' | ago -F , '{ ret=split($0,a,"\""); if(ret%2==0){ pLine=$0; pNF=NF; getline; NF=pNF+NF-1; $0=pLine $0}; print NF; print}'
4
aaa,bbb,"ccc,dddeeee"
$ echo 20 | ago 'BEGIN{ Factorial=func(x){ if x==1 {1} else { x*Factorial(x-1) }}} {print Factorial($1)}'
2432902008176640000
$ echo 12 34| ago '{ print func(a, b){return b, a}($1, $2) }'
34 12
$

Version

under development

Please note that the language and command args may change at any time.

Still not implemented

• var: CONVFMT
• print error with line number
• asort(),asort()
• import & call go library
• goroutine
• define variadic functions
• test command option

Difference from AWK

• {} block has a local scope. variables name beginning with uppercase are global, others are local.
• with "-g" option all variables have global scopes (same as AWK).
• multiple value assignment (ex. BEGIN{a,b=1,2})
• define func in action (ex. { swap=func(a,b){return b,a}; print swap("a","b"); } // b a )
• anonymous func (ex. { print func(a,b){return b,a}("a","b"); } // b a )
• "if", "for", "while" conditions do not need parentheses, statements need curly braces. (ex. for a<10 {a=a+1})
• atan2(0,-0)=0 (not Pi)
• number format: exponent format (ex.2e+3) and hexadecimal (ex.0x10) is supported, octal format (ex.0123) is NOT supported.
• A command can be piped to getline (ex. "date" | getline DATE), but the command is not invoked from shell, cannot use shell functions in the command.
• can set multiple chars to RS. (same as GAWK)
• Changing RS variable is valid only before scanning files. (Can change RS only in "BEGIN{}" rule.)
• All unicode character can be used for variable names(ex. ビール="beer!";print ビール)

To be fixed

• no bool literal (true/false->0/1)