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A text-mode escape interpreter can't do anything meaningful with cursor positioning, DEC private modes, or terminal resets — but it must still consume them, not print them as literal text. Before this change, any sequence outside SGR / EL / OSC-8 errored out of parseOne, and view.go rendered the unparsed bytes as visible cells. On Windows this would show up as junk at the start of main-panel output once we add PTY support using ConPTY, because ConPTY's session-init stream is full of such sequences. Three additions to the state machine: - stateEscape: a single byte in 0x30–0x7E after ESC (e.g. ESC c = RIS) is a complete Fs/Fp sequence per ECMA-48; consume and reset. - stateCSI: accept the DEC private-mode prefix bytes (<, =, >, ?), and accept a CSI final byte (0x40–0x7E) immediately after [ as the end of a zero-param sequence. - stateParams: accept any CSI final byte we don't implement as the end of the sequence rather than a parse error. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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