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|
package decor
import (
"fmt"
"unicode/utf8"
)
// Merge wraps its decorator argument with intention to sync width
// with several decorators of another bar. Visual example:
//
// +----+--------+---------+--------+
// | B1 | MERGE(D, P1, Pn) |
// +----+--------+---------+--------+
// | B2 | D0 | D1 | Dn |
// +----+--------+---------+--------+
//
func Merge(decorator Decorator, placeholders ...WC) Decorator {
if _, ok := decorator.Sync(); !ok || len(placeholders) == 0 {
return decorator
}
md := &mergeDecorator{
Decorator: decorator,
wc: decorator.GetConf(),
placeHolders: make([]*placeHolderDecorator, len(placeholders)),
}
decorator.SetConf(WC{})
for i, wc := range placeholders {
if (wc.C & DSyncWidth) == 0 {
return decorator
}
md.placeHolders[i] = &placeHolderDecorator{
WC: wc.Init(),
wch: make(chan int),
}
}
return md
}
type mergeDecorator struct {
Decorator
wc WC
placeHolders []*placeHolderDecorator
}
func (d *mergeDecorator) GetConf() WC {
return d.wc
}
func (d *mergeDecorator) SetConf(conf WC) {
d.wc = conf.Init()
}
func (d *mergeDecorator) MergeUnwrap() []Decorator {
decorators := make([]Decorator, len(d.placeHolders))
for i, ph := range d.placeHolders {
decorators[i] = ph
}
return decorators
}
func (d *mergeDecorator) Sync() (chan int, bool) {
return d.wc.Sync()
}
func (d *mergeDecorator) Base() Decorator {
return d.Decorator
}
func (d *mergeDecorator) Decor(st *Statistics) string {
msg := d.Decorator.Decor(st)
msgLen := utf8.RuneCountInString(msg)
var space int
for _, ph := range d.placeHolders {
space += <-ph.wch
}
d.wc.wsync <- msgLen - space
max := <-d.wc.wsync
if (d.wc.C & DextraSpace) != 0 {
max++
}
return fmt.Sprintf(fmt.Sprintf(d.wc.dynFormat, max+space), msg)
}
type placeHolderDecorator struct {
WC
wch chan int
}
func (d *placeHolderDecorator) Decor(st *Statistics) string {
go func() {
d.wch <- utf8.RuneCountInString(d.FormatMsg(""))
}()
return ""
}
|
