github.com/blend/go-sdk@v1.20220411.3/fileutil/read_lines.go (about)

     1  /*
     2  
     3  Copyright (c) 2022 - Present. Blend Labs, Inc. All rights reserved
     4  Use of this source code is governed by a MIT license that can be found in the LICENSE file.
     5  
     6  */
     7  
     8  package fileutil
     9  
    10  import (
    11  	"bufio"
    12  	"os"
    13  
    14  	"github.com/blend/go-sdk/ex"
    15  )
    16  
    17  // ReadLines reads a file and calls the handler for each line.
    18  func ReadLines(filePath string, handler func(string) error) error {
    19  	f, err := os.Open(filePath)
    20  	if err != nil {
    21  		return ex.New(err)
    22  	}
    23  	defer f.Close()
    24  
    25  	scanner := bufio.NewScanner(f)
    26  	for scanner.Scan() {
    27  		line := scanner.Text()
    28  		err = handler(line)
    29  		if err != nil {
    30  			return ex.New(err)
    31  		}
    32  	}
    33  	return nil
    34  }