Eliminate the glib requirement for ui-less plugins

plugins/CMakeLists.txt

@@ -41,10 +41,6 @@ elseif(APPLE)
     target_link_libraries(plugins-common PRIVATE
         "${APPLE_FOUNDATION_LIBRARY}")
 else()
-    find_package(PkgConfig REQUIRED)
-    pkg_check_modules(GLIB REQUIRED glib-2.0)
-    target_include_directories(plugins-common PRIVATE ${GLIB_INCLUDE_DIRS})
-    target_link_libraries(plugins-common PRIVATE ${GLIB_LIBRARIES})
 endif()
 
 if((SFIZZ_LV2 AND SFIZZ_LV2_UI) OR SFIZZ_VST OR SFIZZ_AU OR SFIZZ_VST2)

plugins/common/plugin/NativeHelpers.cpp

@@ -5,6 +5,9 @@
 // If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
 
 #include "NativeHelpers.h"
+#include <absl/strings/match.h>
+#include <absl/strings/strip.h>
+#include <absl/strings/string_view.h>
 #include <stdexcept>
 #include <cstdlib>
 
@@ -25,21 +28,94 @@ const fs::path& getUserDocumentsDirectory()
 #elif defined(__APPLE__)
     // implemented in NativeHelpers.mm
 #else
-#include <glib.h>
-
 const fs::path& getUserDocumentsDirectory()
 {
     static const fs::path directory = []() -> fs::path {
-        const gchar* path = g_get_user_special_dir(G_USER_DIRECTORY_DOCUMENTS);
-        if (path)
-            return fs::path(path);
-        else {
-            const char* home = getenv("HOME");
-            if (home && home[0] == '/')
-                return fs::path(home) / "Documents";
-            throw std::runtime_error("Cannot get the document directory.");
+        for (const XdgUserDirsEntry& ent :
+                 parseXdgUserDirs(getXdgConfigHome() / "user-dirs.dirs")) {
+            if (ent.name == "XDG_DOCUMENTS_DIR")
+                return ent.value;
         }
+        return getUserHomeDirectory() / "Documents";
     }();
     return directory;
 }
+
+const fs::path& getUserHomeDirectory()
+{
+    static const fs::path directory = []() -> fs::path {
+        const char* home = getenv("HOME");
+        if (home && home[0] == '/')
+            return fs::u8path(home);
+        else
+            throw std::runtime_error("Cannot get the home directory.");
+    }();
+    return directory;
+}
+
+const fs::path& getXdgConfigHome()
+{
+    static const fs::path directory = []() -> fs::path {
+        const char* config = getenv("XDG_CONFIG_HOME");
+        if (config && config[0] == '/')
+            return fs::u8path(config);
+        else
+            return getUserHomeDirectory() / ".config";
+
+    }();
+    return directory;
+}
+
+std::vector<XdgUserDirsEntry> parseXdgUserDirs(const fs::path& userDirsPath)
+{
+    // from user-dirs.dirs(5)
+    //   This file contains lines of the form `XDG_NAME_DIR=VALUE`
+    //   VALUE must be of the form "$HOME/Path" or "/Path".
+    //   Lines beginning with a # character are ignored.
+
+    std::vector<XdgUserDirsEntry> ents;
+    const fs::path& home = getUserHomeDirectory();
+
+    fs::ifstream in(userDirsPath);
+    std::string lineBuf;
+
+    lineBuf.reserve(256);
+    while (std::getline(in, lineBuf)) {
+        absl::string_view line(lineBuf);
+
+        line = absl::StripLeadingAsciiWhitespace(line);
+        if (line.empty() || line.front() == '#')
+            continue;
+
+        size_t pos = line.find('=');
+        if (pos == line.npos)
+            continue;
+
+        XdgUserDirsEntry ent;
+        ent.name = std::string(line.substr(0, pos));
+
+        absl::string_view rawValue = line.substr(pos + 1);
+
+        rawValue = absl::StripTrailingAsciiWhitespace(rawValue);
+
+        if (rawValue.size() < 2 || rawValue.front() != '"' || rawValue.back() != '"')
+            continue;
+
+        rawValue.remove_prefix(1);
+        rawValue.remove_suffix(1);
+
+        if (!rawValue.empty() && rawValue.front() == '/')
+            ent.value = fs::u8path(rawValue.begin(), rawValue.end());
+        else if (absl::StartsWith(rawValue, "$HOME")) {
+            absl::string_view part = rawValue.substr(5);
+            ent.value = home / fs::u8path(part.begin(), part.end()).relative_path();
+        }
+        else
+            continue;
+
+        ents.push_back(std::move(ent));
+    }
+
+    return ents;
+}
 #endif

plugins/common/plugin/NativeHelpers.h

@@ -6,5 +6,13 @@
 
 #pragma once
 #include <ghc/fs_std.hpp>
+#include <vector>
 
 const fs::path& getUserDocumentsDirectory();
+
+#if !defined(_WIN32) && !defined(__APPLE__)
+const fs::path& getUserHomeDirectory();
+const fs::path& getXdgConfigHome();
+struct XdgUserDirsEntry { std::string name; fs::path value; };
+std::vector<XdgUserDirsEntry> parseXdgUserDirs(const fs::path& userDirsPath);
+#endif

plugins/common/plugin/SfizzSettings.cpp

@@ -5,6 +5,7 @@
 // If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
 
 #include "SfizzSettings.h"
+#include "NativeHelpers.h"
 #include <memory>
 #include <cstdlib>
 
@@ -112,16 +113,7 @@ bool SfizzSettings::store(const char* name, absl::string_view value)
 
 static const fs::path getSettingsPath()
 {
-    fs::path dirPath;
-    const char* env;
-    if ((env = getenv("XDG_CONFIG_HOME")) && env[0] == '/')
-        dirPath = fs::path(env);
-    else if ((env = getenv("HOME")) && env[0] == '/')
-        dirPath = fs::path(env) / ".config";
-    else
-        return {};
-    dirPath /= "SFZTools";
-    dirPath /= "sfizz";
+    const fs::path dirPath = getXdgConfigHome() / "SFZTools" / "sfizz";
     std::error_code ec;
     fs::create_directories(dirPath, ec);
     if (ec)