vise/go/resource/resource.go

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package resource
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import (
"context"
"fmt"
"log"
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)
// EntryFunc is a function signature for retrieving value for a key
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.
type Resource interface {
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GetTemplate(sym string) (string, error) // Get the template for a given symbol.
GetCode(sym string) ([]byte, error) // Get the bytecode for the given symbol.
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PutMenu(string, string) error // Add a menu item.
ShiftMenu() (string, string, error) // Remove and return the first menu item in list.
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.
RenderMenu() (string, error)
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FuncFor(sym string) (EntryFunc, error) // Resolve symbol code point for.
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}
type MenuResource struct {
menu [][2]string
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next [2]string
prev [2]string
}
func(m *MenuResource) SetMenuBrowse(selector string, title string, back bool) error {
entry := [2]string{selector, title}
if back {
m.prev = entry
} else {
m.next = entry
}
return nil
}
func(m *MenuResource) PutMenu(selector string, title string) error {
m.menu = append(m.menu, [2]string{selector, title})
log.Printf("menu %v", m.menu)
return nil
}
func(m *MenuResource) ShiftMenu() (string, string, error) {
if len(m.menu) == 0 {
return "", "", fmt.Errorf("menu is empty")
}
r := m.menu[0]
m.menu = m.menu[1:]
return r[0], r[1], nil
}
func(m *MenuResource) RenderMenu() (string, error) {
r := ""
for true {
l := len(r)
choice, title, err := m.ShiftMenu()
if err != nil {
break
}
if l > 0 {
r += "\n"
}
r += fmt.Sprintf("%s:%s", choice, title)
}
return r, nil
}