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package ignorefile
import (
"bufio"
"bytes"
"io"
"path/filepath"
"strings"
)
// ReadAll reads an ignore file from a reader and returns the list of file
// patterns to ignore, applying the following rules:
//
// - An UTF8 BOM header (if present) is stripped.
// - Lines starting with "#" are considered comments and are skipped.
//
// For remaining lines:
//
// - Leading and trailing whitespace is removed from each ignore pattern.
// - It uses [filepath.Clean] to get the shortest/cleanest path for
// ignore patterns.
// - Leading forward-slashes ("/") are removed from ignore patterns,
// so "/some/path" and "some/path" are considered equivalent.
func ReadAll(reader io.Reader) ([]string, error) {
if reader == nil {
return nil, nil
}
var excludes []string
currentLine := 0
utf8bom := []byte{0xEF, 0xBB, 0xBF}
scanner := bufio.NewScanner(reader)
for scanner.Scan() {
scannedBytes := scanner.Bytes()
// We trim UTF8 BOM
if currentLine == 0 {
scannedBytes = bytes.TrimPrefix(scannedBytes, utf8bom)
}
pattern := string(scannedBytes)
currentLine++
// Lines starting with # (comments) are ignored before processing
if strings.HasPrefix(pattern, "#") {
continue
}
pattern = strings.TrimSpace(pattern)
if pattern == "" {
continue
}
// normalize absolute paths to paths relative to the context
// (taking care of '!' prefix)
invert := pattern[0] == '!'
if invert {
pattern = strings.TrimSpace(pattern[1:])
}
if len(pattern) > 0 {
pattern = filepath.Clean(pattern)
pattern = filepath.ToSlash(pattern)
if len(pattern) > 1 && pattern[0] == '/' {
pattern = pattern[1:]
}
}
if invert {
pattern = "!" + pattern
}
excludes = append(excludes, pattern)
}
if err := scanner.Err(); err != nil {
return nil, err
}
return excludes, nil
}
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