Fix real hardware/busybox breakage: dead compgen dependency, unreliable sourced-path detection, and fork-heavy pipelines in fx sources; verified against busybox ash+awk directly

2026-08-17 23:19:07 -04:00
parent b4d619de8a
commit df3c328424
5 changed files with 51 additions and 14 deletions
@@ -3,9 +3,23 @@
 # typed and moved on from before (thefuck's history.py idea). Reads
 # HISTFILE directly since a separate process doesn't inherit the parent
 # shell's in-memory history.
+#
+# Single awk pass over the tail of the file: on weak/emulated hardware
+# every avoided fork+exec matters (measured: an unoptimized PATH walk in
+# 40-pathfuzzy.sh took >30s on this box before being fixed; pipeline
+# depth has the same tax, just smaller per-hop) -- a five-process
+# tail|grep|grep|awk|tail chain does the same job as one awk script
+# reading the file once.
 cmd="$1"
 first_word=$(printf '%s' "$cmd" | awk '{print $1}')
 [ -n "$first_word" ] || exit 0
 hf="${HISTFILE:-$HOME/.bash_history}"
 [ -r "$hf" ] || exit 0
-tail -n 300 "$hf" 2>/dev/null | grep -F -- "$first_word " | grep -vF -- "$cmd" | awk '!seen[$0]++' | tail -5
+
+tail -n 300 "$hf" 2>/dev/null | awk -v first="$first_word" -v full="$cmd" '
+index($0, first " ") == 1 && $0 != full && !seen[$0]++ { buf[++n] = $0 }
+END {
+    start = (n > 5) ? n - 4 : 1
+    for (i = start; i <= n; i++) print buf[i]
+}
+'