Moved configfile to the driver

driver/configfile.cpp

@@ -0,0 +1,175 @@
+#include <iostream>
+#include <string>
+#include <cassert>
+#include <cstring>
+
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+
+#include "libconfig.h++"
+
+#include "driver/configfile.h"
+
+#include "mars.h"
+
+namespace sys = llvm::sys;
+
+ConfigFile::ConfigFile()
+{
+    cfg = new libconfig::Config;
+}
+
+ConfigFile::~ConfigFile()
+{
+   // delete cfg;
+}
+
+
+bool ConfigFile::locate(sys::Path& p, const char* argv0, void* mainAddr, const char* filename)
+{
+    // temporary configuration
+
+    // try the current working dir
+    p = sys::Path::GetCurrentDirectory();
+    p.appendComponent(filename);
+    if (sys::fs::exists(p.str()))
+        return true;
+
+    // try next to the executable
+    p = sys::Path::GetMainExecutable(argv0, mainAddr);
+    p.eraseComponent();
+    p.appendComponent(filename);
+    if (sys::fs::exists(p.str()))
+        return true;
+
+    // user configuration
+
+    // try ~/.ldc
+    p = sys::Path::GetUserHomeDirectory();
+    p.appendComponent(".ldc");
+    p.appendComponent(filename);
+    if (sys::fs::exists(p.str()))
+        return true;
+
+#if _WIN32
+    // try home dir
+    p = sys::Path::GetUserHomeDirectory();
+    p.appendComponent(filename);
+    if (sys::fs::exists(p.str()))
+        return true;
+#endif
+
+    // system configuration
+
+#if _WIN32
+    // try the install-prefix
+    p = sys::Path(LDC_INSTALL_PREFIX);
+    p.appendComponent(filename);
+    if (sys::fs::exists(p.str()))
+        return true;
+#else
+    // try the install-prefix/etc
+    p = sys::Path(LDC_INSTALL_PREFIX);
+    p.appendComponent("etc");
+    p.appendComponent(filename);
+    if (sys::fs::exists(p.str()))
+        return true;
+
+    // try the install-prefix/etc/ldc
+    p = sys::Path(LDC_INSTALL_PREFIX);
+    p.appendComponent("etc");
+    p.appendComponent("ldc");
+    p.appendComponent(filename);
+    if (sys::fs::exists(p.str()))
+        return true;
+
+    // try /etc (absolute path)
+    p = sys::Path("/etc");
+    p.appendComponent(filename);
+    if (sys::fs::exists(p.str()))
+        return true;
+
+    // try /etc/ldc (absolute path)
+    p = sys::Path("/etc/ldc");
+    p.appendComponent(filename);
+    if (sys::fs::exists(p.str()))
+        return true;
+#endif
+
+    return false;
+}
+
+bool ConfigFile::read(const char* argv0, void* mainAddr, const char* filename)
+{
+    sys::Path p;
+    if (!locate(p, argv0, mainAddr, filename))
+    {
+        // failed to find cfg, users still have the DFLAGS environment var
+        std::cerr << "Error failed to locate the configuration file: " << filename << std::endl;
+        return false;
+    }
+
+    // save config file path for -v output
+    pathstr = p.str();
+
+    try
+    {
+        // read the cfg
+        cfg->readFile(p.c_str());
+
+        // make sure there's a default group
+        if (!cfg->exists("default"))
+        {
+            std::cerr << "no default settings in configuration file" << std::endl;
+            return false;
+        }
+        libconfig::Setting& root = cfg->lookup("default");
+        if (!root.isGroup())
+        {
+            std::cerr << "default is not a group" << std::endl;
+            return false;
+        }
+
+        // handle switches
+        if (root.exists("switches"))
+        {
+            std::string binpathkey = "%%ldcbinarypath%%";
+
+            std::string binpath = sys::path::parent_path(sys::Path::GetMainExecutable(argv0, mainAddr).str());
+
+            libconfig::Setting& arr = cfg->lookup("default.switches");
+            int len = arr.getLength();
+            for (int i=0; i<len; i++)
+            {
+                std::string v = arr[i];
+
+                // replace binpathkey with binpath
+                size_t p;
+                while (std::string::npos != (p = v.find(binpathkey)))
+                    v.replace(p, binpathkey.size(), binpath);
+
+                switches.push_back(strdup(v.c_str()));
+            }
+        }
+
+    }
+    catch(libconfig::FileIOException& fioe)
+    {
+        std::cerr << "Error reading configuration file: " << filename << std::endl;
+        return false;
+    }
+    catch(libconfig::ParseException& pe)
+    {
+        std::cerr << "Error parsing configuration file: " << filename
+            << "(" << pe.getLine() << "): " << pe.getError() << std::endl;
+        return false;
+    }
+    catch(...)
+    {
+        std::cerr << "Unknown exception caught!" << std::endl;
+        return false;
+    }
+
+    return true;
+}
+