root
42 lines
1.1 KiB
Go
42 lines
1.1 KiB
Go
// Package slots defines the sixteen code slots each player has. Slots 1-3 hold
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// the built-in example programs and are read-only; slots 4-16 belong to the
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// player, who saves source code in them and picks one when launching a ship.
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package slots
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import (
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"io/fs"
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"strings"
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"halcyon/examples"
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)
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const Count = 16
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// builtin lists the example programs, in slot order (slot 1 is the first).
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var builtin = []string{"echo", "telemetry", "pursue"}
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// FirstUser is the first slot a player can write to.
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var FirstUser = len(builtin) + 1
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type Slot struct {
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Number int
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Name string
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Source string
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Builtin bool
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}
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// Valid reports whether n is one of the sixteen slots.
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func Valid(n int) bool { return n >= 1 && n <= Count }
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// Builtin returns the example that occupies slot n, if it is one of the first three.
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func Builtin(n int) (Slot, bool) {
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if n < 1 || n > len(builtin) {
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return Slot{}, false
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}
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src, err := fs.ReadFile(examples.FS, builtin[n-1]+".s")
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if err != nil {
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return Slot{}, false
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}
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return Slot{Number: n, Name: strings.ToUpper(builtin[n-1]), Source: string(src), Builtin: true}, true
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}
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