fix: skip FreshLine by semantic integration in ble.sh #5072
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ble.sh keeps track of the cursor position in the terminal display---including the horizontal position relative to the bottom of the terminal---based on the terminal control sequences that it sends. However, with WezTerm's shell integration, WezTerm inserts the newline (FreshLine) in PROMPT_COMMAND, which breaks the cursor position tracking of ble.sh. The needed cursor position adjustment at the end of the command execution is already performed by ble.sh, so WezTerm does not need to adjust it. In this patch, we skip the request for FreshLine.
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A problem was originally reported in akinomyoga/ble.sh#413.
ble.sh(a line editor for Bash) keeps track of the cursor position in the terminal display (including the horizontal position relative to the bottom of the terminal) based on the terminal control sequences that it sends.However, with WezTerm's semantic integration, WezTerm may insert a newline in
precmd(FreshLine), which breaks the cursor position tracking ofble.sh. The needed cursor position adjustment at the end of the command execution is already performed byble.sh, so WezTerm does not need to adjust it. In this patch, we skip the request for FreshLine inble.sh.But I'm not sure if this is the correct fix. The original sequence OSC A seems to perform FreshLine and StartPrompt. To only perform StartPrompt, one seems to be able to use the sequence OSC P ... BEL. Although OSC P seems to receive a parameter
k=?, it doesn't seem to be used in the codebase, so I just omitted the parameterk. Could you take a look at this?Note: As an alternative option, we can specify the ble.sh option
bleopt prompt_command_changes_layout=1to notify thatprecmd/PROMPT_COMMANDcan change the cursor position (in particular horizontal position), but this adds unneeded flickering of the rendered contents. Because we can just suppress FreshLine this time, I didn't use this approach.