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authorAvi Halachmi <avihpit@yahoo.com>2017-10-12 16:38:35 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2017-10-12 18:26:13 +0200
commit0fd5dbba8f34e006aa0e999002d31e79daf2fdf3 (patch)
treec773d6a6de361d3c18cffb18f3a5fb8816ac38d4 /examples
parent1121b4e568b340cfe2a9b7fc41fb48f4d684ad47 (diff)
downloadbusybox-0fd5dbba8f34e006aa0e999002d31e79daf2fdf3.tar.gz
lineedit: improve multiline PS1 - redraw using last PS1 line. Closes 10381
This patch only affects prompts with newlines. We redraw the prompt [+ input] occasionally, e.g. during tab completion, history browsing or search, etc, and we expect it to align with prior redraws, such that the visible effect is that only the input changes. With multi-line PS1, redraw always printed the prompt some lines below the old one, which resulted in terminal scroll during every redraw. Now we only redraw the last PS1 line, so vertical alignment is easier to manage (we already calculated it using only the last line, but re-drew all lines - that was the culprit), which fixes those extra scrolls. Notes: - We now use the full prompt for the initial draw, after clear-screen (^L), and after tab-completion choices are displayed. Everything else now redraws using the last/sole prompt line. - During terminal resize we now only redraw the last[/sole] prompt line, which is arguably better because it's hard to do right (and we never did). - Good side effect for reverse-i-search: its prompt now replaces only the last line of the original prompt - like other shells do. function old new delta put_prompt_custom - 66 +66 draw_custom - 66 +66 parse_and_put_prompt 766 806 +40 read_line_input 3867 3884 +17 input_tab 1069 1076 +7 cmdedit_setwidth 61 63 +2 redraw 59 47 -12 put_prompt 46 - -46 ------------------------------------------------------------------------------ (add/remove: 2/1 grow/shrink: 4/1 up/down: 198/-58) Total: 140 bytes Signed-off-by: Avi Halachmi <avihpit@yahoo.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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