64 lines
1.1 KiB
Go
64 lines
1.1 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"io"
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"log"
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"os"
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)
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func main() {
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if len(os.Args) != 2 {
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log.Fatalln("one argument: file name")
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}
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f, err := os.Open(os.Args[1])
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if err != nil {
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log.Fatalf("failed to open file %s: %s", os.Args[1], err.Error())
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}
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defer f.Close()
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var i int
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o := os.Stdout
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defer o.Close()
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// File should always start with '1'
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i++
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if _, err = o.WriteString(fmt.Sprintf("%d\n", i)); err != nil {
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log.Fatalln("failed to write index:", err)
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}
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r := bufio.NewReader(f)
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var emptyLine bool
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for {
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emptyLine = false
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l, err := r.ReadString('\n')
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if err == io.EOF {
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break
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}
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if err != nil {
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log.Fatalln("failed to read line:", err)
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}
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if len(l) == 1 {
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emptyLine = true
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}
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if _, err = o.WriteString(l); err != nil {
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log.Fatalln("failed to write to output:", err)
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}
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if emptyLine {
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i++
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if _, err := o.WriteString(fmt.Sprintf("%d\n", i)); err != nil {
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log.Fatalln("failed to write index:", err)
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}
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}
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}
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}
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