From f5b09df9c88d49c95fd0c0ef7b3670b40634ca5c Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Fri, 27 May 2022 09:50:35 +0200
Subject: WIP: automatic externals

---
 src/search.cc | 120 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 src/search.cc

(limited to 'src/search.cc')

diff --git a/src/search.cc b/src/search.cc
new file mode 100644
index 0000000..e33fc04
--- /dev/null
+++ b/src/search.cc
@@ -0,0 +1,120 @@
+#include "search.h"
+
+#include <iostream>
+
+#include "libctor.h"
+
+// https://stackoverflow.com/questions/17939930/finding-out-what-the-gcc-include-path-is
+
+// /usr/include/
+// /usr/local/include
+std::filesystem::path findFile(const Settings& settings,
+                               const std::string& needle,
+                               const std::vector<std::string>& haystack)
+{
+	if(settings.verbose > 0)
+	{
+		std::cout << "Looking for '" << needle << "'\n";
+	}
+	for(const auto& path : haystack)
+	{
+		std::filesystem::path candidate = std::filesystem::path(path) / needle;
+		if(settings.verbose > 1)
+		{
+			std::cout << " in '" << candidate.string() << "' ... ";
+		}
+		if(std::filesystem::exists(candidate))
+		{
+			if(settings.verbose > 1)
+			{
+				std::cout << "yes\n";
+			}
+			return path;
+		}
+		else
+		{
+			if(settings.verbose > 1)
+			{
+				std::cout << "no\n";
+			}
+		}
+	}
+
+	if(settings.verbose > 0)
+	{
+		std::cout << "Not found.\n";
+	}
+
+	return ""; // not found
+}
+
+std::filesystem::path findHeader(const Settings& settings,
+                                 const std::string& needle,
+                                 const std::vector<std::string>& haystack)
+{
+	auto paths = haystack;
+	paths.insert(paths.end(),
+	             settings.include_paths.begin(),
+	             settings.include_paths.end());
+	return findFile(settings, needle, paths);
+}
+
+std::vector<std::filesystem::path> findBasename(const Settings& settings,
+                                                const std::string& needle,
+                                                const std::vector<std::string>& haystack)
+{
+	std::vector<std::filesystem::path> matches;
+	if(settings.verbose > 0)
+	{
+		std::cout << "Looking for basename '" << needle << "'\n";
+	}
+
+	for(const auto& path : haystack)
+	{
+		if(settings.verbose > 1)
+		{
+			std::cout << "Looking in '" << path << "\n";
+		}
+
+		for(const auto& dir_entry : std::filesystem::directory_iterator{path})
+		{
+			if(std::filesystem::is_regular_file(dir_entry))
+			{
+				if(dir_entry.path().stem() == needle)
+				{
+					if(settings.verbose > 1)
+					{
+						std::cout << "Found " << path / dir_entry.path() << "\n";
+					}
+					matches.push_back(path / dir_entry.path());
+				}
+			}
+		}
+	}
+
+	if(matches.empty() && settings.verbose > 0)
+	{
+		std::cout << "Not found.\n";
+	}
+
+	return matches;
+}
+
+std::vector<std::filesystem::path> findLibrary(const Settings& settings,
+                                               const std::string& needle,
+                                               const std::vector<std::string>& haystack)
+{
+	using namespace std::string_literals;
+
+	std::string lib = needle;
+	if(!lib.starts_with("lib"))
+	{
+		lib = "lib"s + needle;
+	}
+	auto paths = haystack;
+	paths.insert(paths.end(),
+	             settings.library_paths.begin(),
+	             settings.library_paths.end());
+	return findBasename(settings, lib, paths);
+}
+
-- 
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