#!/bin/bash
# Search the offline NVIDIA docs corpus fetched by fetch_nvidia_docs.sh.
#
#   KDOCS=/opt/nvidia-docs ./search_docs.sh "cp.async.bulk"        # find it
#   KDOCS=/opt/nvidia-docs ./search_docs.sh -C 12 "expect_tx"      # with more context
#
# Searches the .txt renderings (greppable); falls back to the installed CUDA headers for API
# signatures, which are more authoritative than any web page and are always present.
set -uo pipefail
DOCS=${KDOCS:-/opt/nvidia-docs}
CTX=4
if [ "${1:-}" = "-C" ]; then CTX=$2; shift 2; fi
PAT=${1:-}
[ -z "$PAT" ] && { echo "usage: [KDOCS=dir] search_docs.sh [-C n] <pattern>" >&2; exit 1; }

if [ -d "$DOCS" ] && ls "$DOCS"/*.txt >/dev/null 2>&1; then
  echo "== $DOCS =="
  grep -rn --color=never -C "$CTX" -- "$PAT" "$DOCS"/*.txt 2>/dev/null | head -80
else
  echo "no fetched docs at $DOCS (run fetch_nvidia_docs.sh, or set KDOCS)" >&2
fi

# Search EVERY include root, deduped by real path: /usr/local/cuda/include and
# /usr/local/cuda/targets/<arch>/include are different trees, and cuda.h (where the driver API lives)
# is only in the latter -- picking just the first one silently finds nothing.
INCS=$(for d in /usr/local/cuda*/targets/*/include /usr/local/cuda*/include; do
         [ -d "$d" ] && readlink -f "$d"
       done | sort -u)
if [ -n "$INCS" ]; then
  echo
  echo "== CUDA headers -- authoritative for signatures =="
  # shellcheck disable=SC2086
  grep -rn --include="*.h" --include="*.hpp" --include="*.cuh" --color=never -- "$PAT" $INCS 2>/dev/null | head -15
fi