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sfeed_content: optimizations - sfeed_curses - sfeed curses UI (now part of sfee… |
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git clone git://git.codemadness.org/sfeed_curses |
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--- |
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commit 8e151ce48b503ad0ff0e24cb1be3bc93d6fbd895 |
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parent 7bf22e2b26d6e81c28404cc0230b7a0b6dee54c3 |
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Author: Hiltjo Posthuma <[email protected]> |
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Date: Mon, 25 Oct 2021 22:59:20 +0200 |
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sfeed_content: optimizations |
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- Optimize the unescape() function. Use a temporary replacement character so |
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escaping escape codes work correctly. The \x01 character cannot occur in the |
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sfeed(5) data. |
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- Optimize text decoding in gawk and other awk implementations that support |
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unicode. This forces a simpler byte decoding and increases performance. This |
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works because the sfeed(5) data is UTF-8. |
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Diffstat: |
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M sfeed_content | 22 ++++++++-------------- |
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1 file changed, 8 insertions(+), 14 deletions(-) |
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--- |
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diff --git a/sfeed_content b/sfeed_content |
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@@ -1,21 +1,15 @@ |
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#!/bin/sh |
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# Content viewer for sfeed(5) lines. |
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-awk -F '\t' ' |
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+# The locale is set to "C" for performance. The input is always UTF-8. |
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+LC_ALL=C awk -F '\t' ' |
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function unescape(s) { |
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- for (data = ""; (idx = index(s, "\\")); s = substr(s, idx + 2)) { |
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- prev = substr(s, 1, idx - 1) |
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- c = substr(s, idx + 1, 1) |
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- if (c == "t") |
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- data = data prev "\t" |
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- else if (c == "n") |
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- data = data prev "\n" |
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- else if (c == "\\") |
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- data = data prev "\\" |
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- else |
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- data = data prev # ignore other. |
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- } |
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- return data s # rest |
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+ # use the character "\x01" as a temporary replacement for "\". |
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+ gsub("\\\\\\\\", "\x01", s); |
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+ gsub("\\\\n", "\n", s); |
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+ gsub("\\\\t", "\t", s); |
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+ gsub("\x01", "\\", s); # restore "\x01" to "\". |
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+ return s; |
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} |
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BEGIN { |
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htmlconv = "lynx -stdin -dump " \ |
