Golf follows the tradition of shell, awk, and perl, letting you write Go programs as one-liners.
Invoke golf with a snippet of Go code in the -e flag, which will be compiled
and run for you.
Additional flags such as -n turn on awk/perl-like line mode, which are useful
in processing text data. See the examples below and in the godoc.
Some variables and functions are provided in the prelude package. These are inlined and made available to the one-liner. They are common elements of one-liner coding, for example the current line being processed in line mode.
# cat -n (see more about "line mode" in command godoc)
golf -ne 'fmt.Printf("%6d %s", LineNum, Line)' FILE1 FILE2
# head MYFILE
golf -pe 'if LineNum == 10 { break File }' MYFILE
# Additional packages may be imported using -M pkg. Alternatively,
# specify the -g flag to let goimports figure it out.
golf -gle 'Print("The time is ", time.Now())'
# -a mode (which implies -n) automatically splits input fields.
# These can be accessed from the Fields slice, or using
# the convenient Field accessor (supports 1-based and negative indexes).
ps aux | golf -ale 'Print(Field(5))'
echo "tom, dick, and harry" | golf -ale 'Print(Field(-2))'
# Sum sizes. Note flags replacing awk/perl BEGIN and END blocks.
ls -l | golf -al -BEGIN 'sum := 0' -e 'sum += GAtoi(Field(5))' -END 'Print(sum)'
# Convert TSV to CSV.
golf -F '/\t/' -ple 'for i, v := range Fields { Fields[i] = strconv.Quote(v) }; Line = Join(Fields, ",")'
# Upper-case the contents of files, editing them in-place.
golf -pI .bak -e 'Line = strings.ToUpper(Line)' FILE1 FILE2
# -i does the same with no backup.
# Perl users note: -i does not take arguments; "ne" here mean -n -e.
find . -name \*.css | xargs golf -ine 'Print(strings.ReplaceAll(Line, "chartreuse", "lime"))'
go install github.com/gaal/golf@latest
MIT - See LICENSE file.
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