install-tree-sitter-lib

#! /usr/bin/env bash
#
# Install the libtree-sitter runtime library.
#
set -eu -o pipefail

prog_name=$(basename "$0")

# Installation root for the tree-sitter executable and runtime library
default_prefix=$(pwd)/tree-sitter

error() {
  echo "Current directory: $(pwd)" >&2
  echo "Error: $@" >&2
  exit 1
}

usage() {
  cat <<EOF
Compile the tree-sitter library and install it.
Usage: $prog_name [OPTIONS]
Options:
  --help
      Show this message and exit.
  --prefix PATH
      Global installation directory for tree-sitter executables and libraries.
      Default: $default_prefix
EOF
}

prefix="$default_prefix"

while [[ $# -gt 0 ]]; do
  case "$1" in
    --help)
      usage
      exit 0
      ;;
    --prefix)
      prefix="$2"
      shift
      ;;
    *)
      error "Invalid argument passed to '${prog_name}': '$1'"
  esac
  shift
done

libdir="$prefix"/lib

dir_name=$(dirname "$BASH_SOURCE")
"$dir_name"/update-version-symlinks
"$dir_name"/download-tree-sitter --lazy

# We use tree-sitter's Makefile to build the tree-sitter library. It
# uses the $(CC), $(AR), and $(STRIP) Make variables to find
# (respectfully) the C compiler, ar, and strip tools. These tools may
# be prefixed by the target triplet in case of cross-compilation, as
# in x86_64-w64-mingw32-gcc. The Makefile cannot discover these
# prefixed tools, they have to be passed as variables or through the
# environment. As we're building an OCaml library, and opam is likely
# installed, ask opam which C compiler is used by the OCaml toolchain
# installed in the current opam switch. Guess the complete name of the
# ar and strip tool from the C compiler name. Users invoking this
# script can always set $CC, $AR, and $STRIP as environment variables.

if [[ -z "${CC:-}" ]]; then
  CC=$(opam var sys-ocaml-cc 2>/dev/null || \
         opam exec -- ocamlc -config-var c_compiler 2>/dev/null || \
         opam exec -- ocamlopt -config-var c_compiler 2>/dev/null)
fi
: ${AR:=${CC:+$(printf "%s" "$CC" | sed -E 's/(-?)[^-]*$/\1ar/')}}
: ${STRIP:=${CC:+$(printf "%s" "$CC" | sed -E 's/(-?)[^-]*$/\1strip/')}}

(
  cd downloads/tree-sitter
  make PREFIX="$prefix" ${CC:+CC=$CC} ${AR:+AR=$AR} ${STRIP:+STRIP=$STRIP}
  make install PREFIX="$prefix" ${CC:+CC=$CC}
)

cat <<EOF
tree-sitter libraries were installed in:
  $prefix/lib/
EOF