71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
// SPDX-License-Identifier: Apache-2.0
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// Copyright Authors of K9s
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package view
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import (
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"fmt"
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"log/slog"
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"regexp"
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"sort"
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"strconv"
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"strings"
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"github.com/derailed/k9s/internal/slogs"
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)
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// Env represent K9s and K8s available environment variables.
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type Env map[string]string
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// EnvRX match $XXX, $!XXX, ${XXX} or ${!XXX} custom arg.
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// |
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// | (g2)(group 3) (g5)( group 6 )
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// | ( group 1 ) ( group 4 )
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// | ( group 0 )
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var envRX = regexp.MustCompile(`(\$(!?)([\w\-]+))|(\$\{(!?)([\w\-%/: ]+)})`)
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// keyFromSubmatch extracts the name and inverse flag of a match.
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func keyFromSubmatch(m []string) (key string, inverse bool) {
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// group 1 matches $XXX and $!XXX args.
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if m[1] != "" {
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return m[3], m[2] == "!"
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}
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// group 4 matches ${XXX} and ${!XXX} args.
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return m[6], m[5] == "!"
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}
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// Substitute replaces env variable keys from in a string with their corresponding values.
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func (e Env) Substitute(arg string) (string, error) {
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matches := envRX.FindAllStringSubmatch(arg, -1)
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if len(matches) == 0 {
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return arg, nil
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}
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// To prevent the substitution starts with the shorter environment variable,
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// sort with the length of the found environment variables.
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sort.Slice(matches, func(i, j int) bool {
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return len(matches[i][0]) > len(matches[j][0])
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})
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for _, m := range matches {
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key, inverse := keyFromSubmatch(m)
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v, ok := e[strings.ToUpper(key)]
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if !ok {
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slog.Warn("No k9s environment matching key",
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slogs.Matches, matches,
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slogs.Key, key,
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)
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continue
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}
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if b, err := strconv.ParseBool(v); err == nil {
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if inverse {
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b = !b
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}
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v = fmt.Sprintf("%t", b)
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}
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arg = strings.ReplaceAll(arg, m[0], v)
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}
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return arg, nil
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}
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