From a5dc5b59f8c2352328570ef73c05983730641ddb Mon Sep 17 00:00:00 2001
From: Orfeas Zafeiris <orfeaz@gmail.com>
Date: Mon, 4 Jun 2018 13:28:13 +0300
Subject: [PATCH] Add meson build configuration file

---
 list-headers.py   | 85 +++++++++++++++++++++++++++++++++++++++++++++++
 meson.build       | 44 ++++++++++++++++++++++++
 meson_options.txt |  1 +
 3 files changed, 130 insertions(+)
 create mode 100644 list-headers.py
 create mode 100644 meson.build
 create mode 100644 meson_options.txt

diff --git a/list-headers.py b/list-headers.py
new file mode 100644
index 00000000..cb88f53f
--- /dev/null
+++ b/list-headers.py
@@ -0,0 +1,85 @@
+#!/usr/bin/env python
+
+import os
+import re
+
+description = "Lists all primary sol2 header files"
+
+script_path = os.path.normpath(os.path.dirname(os.path.realpath(__file__)))
+working_dir = os.getcwd()
+os.chdir(script_path)
+
+includes = set([])
+local_include = re.compile(r'#(\s*?)include "(.*?)"')
+project_include = re.compile(r'#(\s*?)include <sol/(.*?)>')
+pragma_once_cpp = re.compile(r'(\s*)#(\s*)pragma(\s+)once')
+ifndef_cpp = re.compile(r'#ifndef SOL_.*?_HPP')
+define_cpp = re.compile(r'#define SOL_.*?_HPP')
+endif_cpp = re.compile(r'#endif // SOL_.*?_HPP')
+
+
+def get_include(line, base_path):
+	local_match = local_include.match(line)
+	if local_match:
+		# local include found
+		full_path = os.path.normpath(
+		    os.path.join(base_path, local_match.group(2))).replace(
+		        '\\', '/')
+		return full_path
+	project_match = project_include.match(line)
+	if project_match:
+		# local include found
+		full_path = os.path.normpath(
+		    os.path.join(base_path, project_match.group(2))).replace(
+		        '\\', '/')
+		return full_path
+	return None
+
+
+def is_include_guard(line):
+	return ifndef_cpp.match(line) or define_cpp.match(
+	    line) or endif_cpp.match(line) or pragma_once_cpp.match(line)
+
+
+def process_file(filename):
+	global includes
+	filename = os.path.normpath(filename)
+	relativefilename = filename.replace(script_path + os.sep, "").replace(
+	    "\\", "/")
+
+	rel_filename = os.path.relpath(filename, script_path).replace('\\', '/')
+
+	if rel_filename in includes:
+		return
+
+	empty_line_state = True
+
+	with open(filename, 'r', encoding='utf-8') as f:
+		includes.add(rel_filename)
+
+		for line in f:
+			# skip comments
+			if line.startswith('//'):
+				continue
+
+			# skip include guard non-sense
+			if is_include_guard(line):
+				continue
+
+			# get relative directory
+			base_path = os.path.dirname(filename)
+
+			# see if it's an include file
+			name = get_include(line, base_path)
+
+			if name:
+				process_file(name)
+				continue
+
+processed_files = [os.path.join(script_path, x) for x in ['sol.hpp']]
+
+for processed_file in processed_files:
+	process_file(processed_file)
+
+for include in includes:
+	print(include)
\ No newline at end of file
diff --git a/meson.build b/meson.build
new file mode 100644
index 00000000..f30d3ebb
--- /dev/null
+++ b/meson.build
@@ -0,0 +1,44 @@
+project('sol2', 'cpp')
+
+# Expose standard dependency
+sol2_dep = declare_dependency(
+	include_directories: include_directories('.'),
+)
+
+
+# Check if we have python installed (required for creating single)
+python = find_program('python3', required: false)
+
+if not python.found()
+	python = find_program('python', required: false)
+endif
+
+single_opt = get_option('single')
+
+if not python.found() and single_opt
+	error('Could not locate Python. Python is required when building a single header.')
+endif
+
+
+# Single header targets requested
+if single_opt
+
+	# Get sol header files
+	cmd = run_command(python, 'list-headers.py')
+
+	if cmd.returncode() != 0
+		error('Could not list sol2 header files.')
+	endif
+
+	# Setup the single generation target
+	sol2_single = custom_target('sol2_single', 
+		output: 'sol2.hpp',
+		input: cmd.stdout().strip().split('\n'),
+		command: [ python, 'single.py', '--output', '@OUTPUT@' ],
+	)
+
+	# Create the dependency
+	sol2_single_dep = declare_dependency(
+		sources: [ sol2_single ],
+	)
+endif
\ No newline at end of file
diff --git a/meson_options.txt b/meson_options.txt
new file mode 100644
index 00000000..a4d904cf
--- /dev/null
+++ b/meson_options.txt
@@ -0,0 +1 @@
+option('single', type: 'boolean', value: false, description: 'Generate the sol2 single header and expose the corresponding build targets')
\ No newline at end of file