1 files changed, 77 insertions, 0 deletions
diff --git a/src/brussel.common/Utils.hpp b/src/brussel.common/Utils.hpp
new file mode 100644
index 0000000..668261b
--- /dev/null
+++ b/src/brussel.common/Utils.hpp
@@ -0,0 +1,77 @@
+#pragma once
+
+#include <robin_hood.h>
+#include <cstdio>
+#include <cstring>
+#include <filesystem>
+#include <glm/glm.hpp>
+#include <string>
+#include <string_view>
+
+namespace Utils {
+
+enum IoMode {
+	Read,
+	WriteTruncate,
+	WriteAppend,
+};
+
+FILE* OpenCstdioFile(const std::filesystem::path& path, IoMode mode, bool binary = false);
+FILE* OpenCstdioFile(const char* path, IoMode mode, bool binary = false);
+
+/// Retrieve a whole line (marked by `\n` or EOF) into the buffer. If the line ends with EOF, two things happen:
+/// 1. a `\n` character is appended to the line content, emulating as-if the line ended with `\n`.
+/// 2. `false` is returned
+/// Otherwise, `true` is returned.
+///
+/// Empty lines are not skipped at all, including the very last empty line if it exists.
+bool ReadCstdioLine(FILE* file, std::string& buffer);
+/// Same as the other overload, except working with a fixed-size buffer.
+/// NOTE: this also gives the length of the line compared to `std::fgets`.
+///       `std::fgets` requires us to run `std::strlen` on the output again to find the length
+bool ReadCstdioLine(FILE* file, char* buffer, size_t bufferSize, size_t* outLineLength = nullptr);
+
+std::string ReadFileAsString(const std::filesystem::path& path);
+
+constexpr float Abs(float v) noexcept {
+	return v < 0.0f ? -v : v;
+}
+
+bool InRangeInclusive(int n, int lower, int upper);
+bool LineContains(glm::ivec2 p1, glm::ivec2 p2, glm::ivec2 candidate);
+
+bool IsColinear(glm::ivec2 p1, glm::ivec2 p2);
+
+template <typename T>
+void HashCombine(std::size_t& seed, const T& v) {
+	seed ^= std::hash<T>{}(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
+}
+
+std::string MakeRandomNumberedName(const char* tag);
+
+} // namespace Utils
+
+struct StringHash {
+	using is_transparent = void;
+
+	std::size_t operator()(const std::string& key) const { return robin_hood::hash_bytes(key.c_str(), key.size()); }
+	std::size_t operator()(std::string_view key) const { return robin_hood::hash_bytes(key.data(), key.size()); }
+	std::size_t operator()(const char* key) const { return robin_hood::hash_bytes(key, std::strlen(key)); }
+};
+
+struct StringEqual {
+	using is_transparent = int;
+
+	bool operator()(std::string_view lhs, const std::string& rhs) const {
+		const std::string_view view = rhs;
+		return lhs == view;
+	}
+
+	bool operator()(const char* lhs, const std::string& rhs) const {
+		return std::strcmp(lhs, rhs.c_str()) == 0;
+	}
+
+	bool operator()(const std::string& lhs, const std::string& rhs) const {
+		return lhs == rhs;
+	}
+};