70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
package resource
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import (
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"context"
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"fmt"
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"log"
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)
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// EntryFunc is a function signature for retrieving value for a key
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type EntryFunc func(ctx context.Context) (string, error)
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// Resource implementation are responsible for retrieving values and templates for symbols, and can render templates from value dictionaries.
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type Resource interface {
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GetTemplate(sym string) (string, error) // Get the template for a given symbol.
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GetCode(sym string) ([]byte, error) // Get the bytecode for the given symbol.
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PutMenu(string, string) error // Add a menu item.
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ShiftMenu() (string, string, error) // Remove and return the first menu item in list.
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SetMenuBrowse(string, string, bool) error // Set menu browser display details.
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RenderTemplate(sym string, values map[string]string) (string, error) // Render the given data map using the template of the symbol.
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RenderMenu() (string, error)
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FuncFor(sym string) (EntryFunc, error) // Resolve symbol code point for.
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}
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type MenuResource struct {
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menu [][2]string
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next [2]string
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prev [2]string
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}
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func(m *MenuResource) SetMenuBrowse(selector string, title string, back bool) error {
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entry := [2]string{selector, title}
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if back {
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m.prev = entry
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} else {
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m.next = entry
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}
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return nil
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}
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func(m *MenuResource) PutMenu(selector string, title string) error {
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m.menu = append(m.menu, [2]string{selector, title})
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log.Printf("menu %v", m.menu)
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return nil
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}
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func(m *MenuResource) ShiftMenu() (string, string, error) {
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if len(m.menu) == 0 {
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return "", "", fmt.Errorf("menu is empty")
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}
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r := m.menu[0]
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m.menu = m.menu[1:]
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return r[0], r[1], nil
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}
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func(m *MenuResource) RenderMenu() (string, error) {
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r := ""
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for true {
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l := len(r)
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choice, title, err := m.ShiftMenu()
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if err != nil {
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break
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}
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if l > 0 {
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r += "\n"
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}
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r += fmt.Sprintf("%s:%s", choice, title)
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}
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return r, nil
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}
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