56 lines
2.2 KiB
TypeScript
56 lines
2.2 KiB
TypeScript
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/**
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* Compute the keystrokes to send so the terminal input line becomes exactly
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* `candidate`, given what is currently on the line. Drives the popup
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* autocomplete live-preview (#1005): moving the selection renders the chosen
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* suggestion into the command line, and switching / reverting rewrites it.
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*
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* - Forward prefix (candidate continues the line): append only the new tail.
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* - Otherwise: clear the current input, then write the full candidate. POSIX
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* shells use Ctrl-U (kill-line); Windows (cmd/PowerShell) uses backspaces
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* sized to the current line length.
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*/
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/**
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* Live-preview rewrites inject Ctrl-U / backspaces into the PTY. Vendor
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* bastion and network-device CLIs treat those bytes as session-kill, so
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* network-device sessions keep the popup but skip the rewrite (#1193).
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*/
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export function shouldWriteAutocompleteLivePreview(
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livePreviewEnabled: boolean,
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isNetworkDevice = false,
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): boolean {
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return livePreviewEnabled && !isNetworkDevice;
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}
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export function isWindowsShellLineInput(
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os: string,
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promptText?: string | null,
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): boolean {
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if (os === "windows") return true;
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// Hosts default to os:"linux" and the flag is easy to leave wrong. Windows
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// shells do not kill the line on Ctrl-U; PSReadLine renders the raw byte
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// literally (e.g. `tkn^Uuv run ...`), so every highlighted suggestion piles
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// onto the command line (#3184). The detected prompt is authoritative when
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// the flag disagrees: a drive-letter path with a backslash (`PS C:\Users>`,
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// `C:\Windows>`) only occurs in a Windows shell prompt.
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return typeof promptText === "string" && /(?:^|\s)[A-Za-z]:\\/.test(promptText);
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}
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export function computeLivePreviewWrite(input: {
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currentLine: string;
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candidate: string;
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os: string;
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/** Detected prompt text; lets a mislabeled host OS flag still clear the line (#3184). */
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promptText?: string;
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}): string {
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const { currentLine, candidate, os } = input;
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if (candidate === currentLine) return "";
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if (candidate.startsWith(currentLine)) {
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return candidate.slice(currentLine.length);
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}
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const clear = isWindowsShellLineInput(os, input.promptText)
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? "\b".repeat(currentLine.length)
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: "\x15";
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return clear + candidate;
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}
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