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89 lines
1.3 KiB
Go
89 lines
1.3 KiB
Go
package history
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import (
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"bufio"
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"io"
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"os"
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"strconv"
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)
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const MaxHistSize = 100
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func Dedupe(s []string) []string {
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if s == nil {
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return nil
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}
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o := make([]string, 0, len(s))
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for si := 0; si < len(s); si++ {
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if si == 0 || s[si] != o[len(o)-1] {
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o = append(o, s[si])
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}
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}
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return o
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}
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func FileSize() int {
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maxSize := MaxHistSize
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maxSizeStr := os.Getenv("RQLITE_HISTFILESIZE")
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if maxSizeStr != "" {
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sz, err := strconv.Atoi(maxSizeStr)
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if err == nil && maxSize > 0 {
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maxSize = sz
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}
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}
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return maxSize
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}
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func Read(r io.Reader) ([]string, error) {
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if r == nil {
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return nil, nil
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}
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var cmds []string
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scanner := bufio.NewScanner(r)
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for scanner.Scan() {
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cmds = append(cmds, scanner.Text())
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}
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return cmds, scanner.Err()
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}
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func Write(j []string, maxSz int, w io.Writer) error {
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if len(j) == 0 {
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return nil
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}
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if w == nil {
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return nil
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}
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// Cut start off slice is bigger, but before or after dupes?
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if len(j) > maxSz {
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j = j[len(j)-maxSz:]
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}
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i := 0
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var k []string
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for {
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k = append(k, j[i])
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for {
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if i < len(j)-1 && j[i] == j[i+1] {
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i++
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continue
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} else if i == len(j) {
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}
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}
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}
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for i := 0; i < len(k)-1; i++ {
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if _, err := w.Write([]byte(k[i] + "\n")); err != nil {
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return err
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}
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}
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_, err := w.Write([]byte(k[len(k)-1]))
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return err
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}
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