From 01ed4ce3d4323c38cb3aeb91053a2a3adb4dfc94 Mon Sep 17 00:00:00 2001
From: Josh Haberman <jhaberman@gmail.com>
Date: Fri, 2 Nov 2018 12:49:15 -0700
Subject: WIP.

---
 build_defs.bzl | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 build_defs.bzl

(limited to 'build_defs.bzl')

diff --git a/build_defs.bzl b/build_defs.bzl
new file mode 100644
index 0000000..6023bf6
--- /dev/null
+++ b/build_defs.bzl
@@ -0,0 +1,100 @@
+
+shell_find_runfiles = """
+  # --- begin runfiles.bash initialization ---
+  # Copy-pasted from Bazel's Bash runfiles library (tools/bash/runfiles/runfiles.bash).
+  set -euo pipefail
+  if [[ ! -d "${RUNFILES_DIR:-/dev/null}" && ! -f "${RUNFILES_MANIFEST_FILE:-/dev/null}" ]]; then
+    if [[ -f "$0.runfiles_manifest" ]]; then
+      export RUNFILES_MANIFEST_FILE="$0.runfiles_manifest"
+    elif [[ -f "$0.runfiles/MANIFEST" ]]; then
+      export RUNFILES_MANIFEST_FILE="$0.runfiles/MANIFEST"
+    elif [[ -f "$0.runfiles/bazel_tools/tools/bash/runfiles/runfiles.bash" ]]; then
+      export RUNFILES_DIR="$0.runfiles"
+    fi
+  fi
+  if [[ -f "${RUNFILES_DIR:-/dev/null}/bazel_tools/tools/bash/runfiles/runfiles.bash" ]]; then
+    source "${RUNFILES_DIR}/bazel_tools/tools/bash/runfiles/runfiles.bash"
+  elif [[ -f "${RUNFILES_MANIFEST_FILE:-/dev/null}" ]]; then
+    source "$(grep -m1 "^bazel_tools/tools/bash/runfiles/runfiles.bash " \
+              "$RUNFILES_MANIFEST_FILE" | cut -d ' ' -f 2-)"
+  else
+    echo >&2 "ERROR: cannot find @bazel_tools//tools/bash/runfiles:runfiles.bash"
+    exit 1
+  fi
+  # --- end runfiles.bash initialization ---
+"""
+
+def _librule(name):
+    return name + "_lib"
+
+def lua_cclibrary(name, srcs, hdrs = [], deps = [], luadeps = []):
+    lib_rule = name + "_lib"
+    so_rule = "lib" + name + ".so"
+    so_file = _remove_prefix(name, "lua/") + ".so"
+
+    native.cc_library(
+        name = _librule(name),
+        hdrs = hdrs,
+        srcs = srcs,
+        deps = deps + [_librule(dep) for dep in luadeps] + ["@lua//:liblua_headers"],
+    )
+
+    native.cc_binary(
+        name = so_rule,
+        linkshared = True,
+        deps = [_librule(name)],
+    )
+
+    native.genrule(
+        name = name + "_copy",
+        srcs = [":" + so_rule],
+        outs = [so_file],
+        cmd = "cp $< $@",
+    )
+
+    native.filegroup(
+        name = name,
+        data = [so_file],
+    )
+
+def _remove_prefix(str, prefix):
+    if not str.startswith(prefix):
+        fail("%s doesn't start with %s" % (str, prefix))
+    return str[len(prefix):]
+
+def lua_library(name, srcs, base, luadeps = []):
+    outs = [_remove_prefix(src, base + "/") for src in srcs]
+    native.genrule(
+        name = name + "_copy",
+        srcs = srcs,
+        outs = outs,
+        cmd = "cp $(SRCS) $(@D)",
+    )
+
+    native.filegroup(
+        name = name,
+        data = outs + luadeps,
+    )
+
+def lua_binary(name, main, luadeps=[]):
+    script = name + ".sh"
+
+    script_contents = (shell_find_runfiles + """
+BASE=$(dirname $(rlocation upb/upb_c.so))
+export LUA_CPATH="$BASE/?.so"
+export LUA_PATH="$BASE/?.lua"
+$(rlocation lua/lua) $(rlocation upb/tools/upbc.lua) "$@"
+""").replace("$", "$$")
+    print(native.repository_name())
+
+    native.genrule(
+        name = "gen_" + name,
+        outs = [script],
+        cmd = "(cat <<'HEREDOC'\n%s\nHEREDOC\n) > $@" % script_contents,
+    )
+    native.sh_binary(
+        name = name,
+        srcs = [script],
+        data = ["@lua//:lua", "@bazel_tools//tools/bash/runfiles", main] + luadeps,
+    )
+
-- 
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