jochen
bb7dd1be5b
Owns its configuration, moved to picom's window rules; started once from the session's xinitrc slot; Go tools restart, rules, window-opacity and toggle, which find the operator's X session from the window manager's environment.
98 lines
2.4 KiB
Go
98 lines
2.4 KiB
Go
// Reading a tool's arguments: JSON numbers arrive as float64, and a missing argument is its default.
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// The same in every desktop module that carries it.
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package main
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import (
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"fmt"
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"math"
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"strings"
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"time"
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)
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// text is a string argument, trimmed; required says an empty one is refused.
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func text(args map[string]any, key string, required bool) (string, error) {
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v, present := args[key]
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if !present || v == nil {
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if required {
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return "", fmt.Errorf("%s is required", key)
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}
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return "", nil
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}
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s, ok := v.(string)
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if !ok {
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return "", fmt.Errorf("%s is a string, not %T", key, v)
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}
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s = strings.TrimSpace(s)
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if s == "" && required {
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return "", fmt.Errorf("%s is required", key)
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}
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return s, nil
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}
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// whole is a whole-number argument within [least, most], or def when absent.
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func whole(args map[string]any, key string, def, least, most int) (int, error) {
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v, present := args[key]
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if !present || v == nil {
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return def, nil
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}
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f, ok := v.(float64)
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if !ok {
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if i, isInt := v.(int); isInt {
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f = float64(i)
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} else {
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return 0, fmt.Errorf("%s is a number, not %T", key, v)
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}
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}
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if f != math.Trunc(f) {
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return 0, fmt.Errorf("%s is a whole number, not %v", key, f)
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}
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n := int(f)
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if n < least || n > most {
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return 0, fmt.Errorf("%s is %d; it is between %d and %d", key, n, least, most)
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}
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return n, nil
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}
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// flag is a boolean argument, or def when absent.
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func flag(args map[string]any, key string, def bool) (bool, error) {
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v, present := args[key]
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if !present || v == nil {
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return def, nil
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}
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b, ok := v.(bool)
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if !ok {
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return false, fmt.Errorf("%s is true or false, not %T", key, v)
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}
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return b, nil
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}
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// texts is a list-of-strings argument.
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func texts(args map[string]any, key string) ([]string, error) {
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v, present := args[key]
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if !present || v == nil {
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return nil, nil
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}
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list, ok := v.([]any)
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if !ok {
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if ss, isStrings := v.([]string); isStrings {
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return ss, nil
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}
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return nil, fmt.Errorf("%s is a list of strings, not %T", key, v)
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}
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out := make([]string, 0, len(list))
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for i, item := range list {
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s, ok := item.(string)
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if !ok {
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return nil, fmt.Errorf("%s[%d] is a string, not %T", key, i, item)
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}
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out = append(out, s)
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}
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return out, nil
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}
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// seconds is a timeout argument in seconds, defaulted and bounded below the runtime's call limit.
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func seconds(args map[string]any, key string, def, most int) (time.Duration, error) {
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n, err := whole(args, key, def, 1, most)
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return time.Duration(n) * time.Second, err
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}
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