35 lines
1.6 KiB
Swift
35 lines
1.6 KiB
Swift
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import Foundation
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/// Renders a per-host command template (an argv array from hosts.json) into a
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/// single remote command string. Tokens are either literals or placeholders:
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/// `{name}` — required; substituted with `subs[name]` (empty if absent)
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/// `{name?}` — optional; the whole word is dropped if the value is nil/empty
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/// Every emitted word is single-quote-escaped, so titles/paths with spaces,
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/// quotes, or `$` can never break out into shell syntax (argv-array semantics:
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/// one array element → exactly one shell word).
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public enum CommandTemplate {
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public static func render(_ template: [String], _ subs: [String: String?]) -> String {
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var words: [String] = []
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for token in template {
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if let ph = placeholder(token) {
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let value = subs[ph.name] ?? nil
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if ph.optional, value == nil || value!.isEmpty { continue }
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words.append(value ?? "")
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} else {
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words.append(token)
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}
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}
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return words.map(SSHTransport.shq).joined(separator: " ")
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}
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/// "{name}" → (name,false); "{name?}" → (name,true); otherwise nil (literal).
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static func placeholder(_ token: String) -> (name: String, optional: Bool)? {
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guard token.hasPrefix("{"), token.hasSuffix("}") else { return nil }
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var inner = String(token.dropFirst().dropLast())
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let optional = inner.hasSuffix("?")
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if optional { inner = String(inner.dropLast()) }
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guard !inner.isEmpty else { return nil }
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return (inner, optional)
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}
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}
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