51 lines
925 B
Go
51 lines
925 B
Go
package head
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import (
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"bbash/environment"
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"bbash/input_parser"
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"bufio"
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"fmt"
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"os"
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"strconv"
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"strings"
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)
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func Head(in input_parser.Input, env *environment.Env) {
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args := strings.SplitN(in.Args, " ", 2)
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var file_path string
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var lines int
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if len(args) >= 1 {
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file_path = strings.TrimSpace(args[0])
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lines = 10
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} else {
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fmt.Print(fmt.Sprintf("No arguments provided"))
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return
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}
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if len(args) == 2 {
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lines1, err := strconv.Atoi(strings.TrimSpace(args[1]))
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lines = lines1
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if err != nil {
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fmt.Print(fmt.Sprintf("Second argument must be a integer"))
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return
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}
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}
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file, err := os.Open(file_path)
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if err != nil {
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fmt.Println(fmt.Sprintf("Error opening file: %s", err.Error()))
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return
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}
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defer file.Close()
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scanner := bufio.NewScanner(file)
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for i := 0; i < lines-1; i++ {
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if(!scanner.Scan()) {
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return
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}
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fmt.Println(scanner.Text())
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}
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scanner.Scan()
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fmt.Print(scanner.Text())
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}
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