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// Copyright 2015 Canonical Ltd.
// Licensed under the LGPLv3, see LICENSE file for details.
package cmd
import (
"io/ioutil"
"strings"
)
// ParseAliasFile will read the specified file and convert
// the content to a map of names to the command line arguments
// they relate to. The function will always return a valid map, even
// if it is empty.
func ParseAliasFile(aliasFilename string) map[string][]string {
result := map[string][]string{}
if aliasFilename == "" {
return result
}
content, err := ioutil.ReadFile(aliasFilename)
if err != nil {
logger.Tracef("unable to read alias file %q: %s", aliasFilename, err)
return result
}
lines := strings.Split(string(content), "\n")
for i, line := range lines {
line = strings.TrimSpace(line)
if line == "" || strings.HasPrefix(line, "#") {
// skip blank lines and comments
continue
}
parts := strings.SplitN(line, "=", 2)
if len(parts) != 2 {
logger.Warningf("line %d bad in alias file: %s", i+1, line)
continue
}
name, value := strings.TrimSpace(parts[0]), strings.TrimSpace(parts[1])
if name == "" {
logger.Warningf("line %d missing alias name in alias file: %s", i+1, line)
continue
}
if value == "" {
logger.Warningf("line %d missing alias value in alias file: %s", i+1, line)
continue
}
logger.Tracef("setting alias %q=%q", name, value)
result[name] = strings.Fields(value)
}
return result
}
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