26 lines
1015 B
Bash
26 lines
1015 B
Bash
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#!/bin/sh
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# History source: suggests the closest-looking command you've actually
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# typed and moved on from before (thefuck's history.py idea). Reads
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# HISTFILE directly since a separate process doesn't inherit the parent
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# shell's in-memory history.
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#
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# Single awk pass over the tail of the file: on weak/emulated hardware
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# every avoided fork+exec matters (measured: an unoptimized PATH walk in
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# 40-pathfuzzy.sh took >30s on this box before being fixed; pipeline
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# depth has the same tax, just smaller per-hop) -- a five-process
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# tail|grep|grep|awk|tail chain does the same job as one awk script
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# reading the file once.
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cmd="$1"
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first_word=$(printf '%s' "$cmd" | awk '{print $1}')
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[ -n "$first_word" ] || exit 0
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hf="${HISTFILE:-$HOME/.bash_history}"
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[ -r "$hf" ] || exit 0
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tail -n 300 "$hf" 2>/dev/null | awk -v first="$first_word" -v full="$cmd" '
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index($0, first " ") == 1 && $0 != full && !seen[$0]++ { buf[++n] = $0 }
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END {
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start = (n > 5) ? n - 4 : 1
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for (i = start; i <= n; i++) print buf[i]
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}
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'
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