configure

#!/bin/sh
set -eu # to debug this script add '-x'

###############################################################################
# Prelude
###############################################################################
# The goal of this script is to automate the configuration and installation
# of packages that are needed to then compile and install syncweb itself.
# coupling: adapted from ~/github/codegraph/configure

SYNCWEB_ONLY=false

for arg in "$@"; do
    case "$arg" in
        --syncweb-only) SYNCWEB_ONLY=true ;;
        --help|-h)
            echo "Usage: ./configure [--syncweb-only]"
            echo ""
            echo "  --syncweb-only   Build only syncweb (no lpizer/indexer)."
            echo "                   Skips semgrep-pfff-langs and tree-sitter setup."
            exit 0 ;;
        *) echo "Unknown option: $arg"; exit 1 ;;
    esac
done

###############################################################################
# Helper functions
###############################################################################

ok()   { echo "  [OK]   $1"; }
warn() { echo "  [WARN] $1"; }
err()  { echo "  [ERR]  $1" >&2; }

errors=0

need_command() {
    if command -v "$1" >/dev/null 2>&1; then
        ok "$1 ($(command -v "$1"))"
    else
        err "$1 not found in PATH"
        errors=$((errors + 1))
    fi
}

want_command() {
    if command -v "$1" >/dev/null 2>&1; then
        ok "$1 ($(command -v "$1"))"
    else
        warn "$1 not found — $2"
    fi
}

check_c_lib() {
    local name pkg header search_dirs dir
    name="$1"
    pkg="$2"
    header="$3"

    if command -v pkg-config >/dev/null 2>&1 \
       && pkg-config --exists "$pkg" 2>/dev/null; then
        ok "$name (pkg-config: $pkg)"
        return 0
    fi

    search_dirs="/usr/include /usr/local/include"
    if command -v brew >/dev/null 2>&1; then
        search_dirs="$search_dirs $(brew --prefix 2>/dev/null)/include"
    fi

    for dir in $search_dirs; do
        if [ -f "$dir/$header" ]; then
            ok "$name (header: $dir/$header)"
            return 0
        fi
    done

    err "$name not found (pkg-config module '$pkg', header '$header')"
    errors=$((errors + 1))
}

# On macOS, extend PKG_CONFIG_PATH for Homebrew
if command -v brew >/dev/null 2>&1; then
    _brew_prefix="$(brew --prefix 2>/dev/null || true)"
    if [ -n "$_brew_prefix" ]; then
        PKG_CONFIG_PATH="${_brew_prefix}/lib/pkgconfig:${PKG_CONFIG_PATH:-}"
        export PKG_CONFIG_PATH
    fi
fi

###############################################################################
# Check required tools
###############################################################################

echo "Checking required tools..."

need_command ocaml
need_command opam
need_command make
need_command git

_cc_found=false
for _cc_candidate in ${CC:-} cc gcc clang; do
    if command -v "$_cc_candidate" >/dev/null 2>&1; then
        ok "C compiler ($_cc_candidate -> $(command -v "$_cc_candidate"))"
        _cc_found=true
        break
    fi
done
if ! $_cc_found; then
    err "No C compiler found (tried cc, gcc, clang). Install one or set \$CC."
    errors=$((errors + 1))
fi

if ! $SYNCWEB_ONLY; then
    need_command curl
    want_command pkg-config "tree-sitter will be built from source"

    # Detect system tree-sitter early
    _ts_required="0.20"
    _ts_found=false
    if command -v pkg-config >/dev/null 2>&1 \
       && pkg-config --exists tree-sitter 2>/dev/null \
       && pkg-config --atleast-version="$_ts_required" tree-sitter 2>/dev/null; then
        _ts_found=true
    fi

    if ! $_ts_found; then
        want_command autoconf "required to build tree-sitter from source"
        want_command automake "required to build tree-sitter from source"
    fi
fi

echo ""

###############################################################################
# Check git submodules
###############################################################################

echo "Checking git submodules..."

if [ -d "semgrep-pfff-libs/TCB" ]; then
    ok "semgrep-pfff-libs (initialized)"
else
    err "semgrep-pfff-libs is empty; run: git submodule update --init --recursive"
    errors=$((errors + 1))
fi

if ! $SYNCWEB_ONLY; then
    if [ -f "semgrep-pfff-langs/parsing_infra/ocaml-tree-sitter-core/configure" ]; then
        ok "semgrep-pfff-langs (initialized, including ocaml-tree-sitter-core)"
    else
        err "semgrep-pfff-langs is empty or ocaml-tree-sitter-core not initialized; run: git submodule update --init --recursive"
        errors=$((errors + 1))
    fi
fi

echo ""

if [ "$errors" -ne 0 ]; then
    echo "$errors error(s) found. Please fix the issues above and re-run ./configure."
    exit 1
fi

###############################################################################
# Setup
###############################################################################

# Initialize submodules. Skipped when not in a git repo (e.g., Docker COPY).
if git rev-parse --git-dir >/dev/null 2>&1; then
    echo "Initializing git submodules..."
    if $SYNCWEB_ONLY; then
        git submodule update --init semgrep-pfff-libs
    else
        git submodule update --init --recursive
    fi
fi

if ! $SYNCWEB_ONLY; then
    # Configure tree-sitter C library (uses system lib if available, else builds from source)
    echo "Setting up tree-sitter..."
    ./semgrep-pfff-langs/scripts/setup-tree-sitter.sh
fi

# Install OCaml dependencies.
echo "Installing opam dependencies..."
if $SYNCWEB_ONLY; then
    opam install --confirm-level=unsafe-yes --deps-only -y ./syncweb.opam
else
    opam install --confirm-level=unsafe-yes --deps-only -y ./syncweb.opam ./lpizer.opam
fi

echo ""

###############################################################################
# Verify C libraries
###############################################################################

if ! $SYNCWEB_ONLY; then
    echo "Verifying C libraries..."
    check_c_lib "PCRE"    "libpcre"    "pcre.h"
    check_c_lib "PCRE2"   "libpcre2-8" "pcre2.h"
    check_c_lib "GMP"     "gmp"        "gmp.h"
    check_c_lib "libev"   "libev"      "ev.h"
    check_c_lib "libcurl" "libcurl"    "curl/curl.h"

    if $_ts_found; then
        ok "tree-sitter (pkg-config: $(pkg-config --modversion tree-sitter))"
    else
        warn "tree-sitter >= $_ts_required not found — will be compiled from source"
    fi

    if [ "$errors" -ne 0 ]; then
        echo "$errors C librar(ies) missing after setup. Please install them."
        exit 1
    fi
fi

echo ''
echo 'Everything looks fine. You can now run: '
echo ''
if $SYNCWEB_ONLY; then
    echo '   $ make syncweb-only'
else
    echo '   $ make'
    echo '   $ make install'
fi