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package describe
import (
"bufio"
"git.ewy.one/pik/model"
"io"
"os"
"strings"
)
var DescriptionPrefixes = []string{
"#",
"//",
}
var descriptions = make(map[model.Target]*string)
// Describe attempts to read a description from a file and stores it in the cache
func Describe(key model.Target, file string) (string, error) {
if d := descriptions[key]; d != nil {
return *d, nil
}
fd, err := os.Open(file)
if err != nil {
msg := err.Error()
descriptions[key] = &msg
return "", err
}
defer fd.Close()
text, err := FromReader(fd)
if err != nil {
return text, err
} else {
descriptions[key] = &text
}
return text, err
}
// FromReader reads a description from an io.Reader and returns it.
// this is not stored in the cache.
func FromReader(reader io.Reader) (string, error) {
scanner := bufio.NewScanner(reader)
scanner.Split(bufio.ScanLines)
scanner.Scan()
text := scanner.Text()
if strings.HasPrefix(text, "#!") {
scanner.Scan()
text = scanner.Text()
}
text = strings.TrimSpace(text)
hasPrefix := false
for _, p := range DescriptionPrefixes {
if strings.HasPrefix(text, p) {
hasPrefix = true
break
}
}
if !hasPrefix {
return "", nil
}
for _, c := range DescriptionPrefixes {
text = strings.TrimPrefix(text, c)
text = strings.TrimSpace(text)
}
return text, nil
}
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