multiline input in a terminal Go application -
i need let user input multiline text console.
here code:
package main import ( "bufio" "fmt" "os" ) func main() { { fmt.println("how read lines here?") in := bufio.newreader(os.stdin) result, err := in.readstring('\n') if err != nil { fmt.println(err) } fmt.println("\nresult") fmt.println(result) } } i pasted in console:
hello world it outputs:
how read lines here? hello world result how read lines here? result hello how read lines here? result world how read lines here? result how read lines here? but expect be:
how read lines here? hello world result how read lines here? result hello world how read lines here? i guess need use eof instead of '\n' how exactly?
update
peterso's answer works except in case when trying paste clipboard text 1 or more empty lines in-between, like:
hello world it prints
enter lines: hello worldresult: hello enter lines: update 2
the great updated peterso's answer works text empty lines.
buffer set of lines , detect end of set of lines. example,
package main import ( "bufio" "fmt" "os" ) func main() { scn := bufio.newscanner(os.stdin) { fmt.println("enter lines:") var lines []string scn.scan() { line := scn.text() if len(line) == 1 { // group separator (gs ^]): ctrl-] if line[0] == '\x1d' { break } } lines = append(lines, line) } if len(lines) > 0 { fmt.println() fmt.println("result:") _, line := range lines { fmt.println(line) } fmt.println() } if err := scn.err(); err != nil { fmt.fprintln(os.stderr, err) break } if len(lines) == 0 { break } } } console:
enter lines: hello world ^] result: hello world enter lines: farewell world ^] result: farewell world enter lines: ^]
to terminate set of lines, on empty line, enter: <ctrl+]><enter>. terminate input, enter single line: <ctrl+]><enter>.
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