Improved logging abstraction

This also gets rid of --log-type, since the nested log type isn't
useful in a multi-threaded situation, and nobody cares about the
"pretty" log type.

src/libutil/logging.hh

@@ -0,0 +1,82 @@
+#pragma once
+
+#include "types.hh"
+
+namespace nix {
+
+typedef enum {
+    lvlError = 0,
+    lvlInfo,
+    lvlTalkative,
+    lvlChatty,
+    lvlDebug,
+    lvlVomit
+} Verbosity;
+
+class Activity;
+
+class Logger
+{
+    friend class Activity;
+
+public:
+
+    virtual ~Logger() { }
+
+    virtual void log(Verbosity lvl, const FormatOrString & fs) = 0;
+
+    void log(const FormatOrString & fs)
+    {
+        log(lvlInfo, fs);
+    }
+
+    virtual void setExpected(const std::string & label, uint64_t value = 1) { }
+    virtual void setProgress(const std::string & label, uint64_t value = 1) { }
+    virtual void incExpected(const std::string & label, uint64_t value = 1) { }
+    virtual void incProgress(const std::string & label, uint64_t value = 1) { }
+
+private:
+
+    virtual void startActivity(Activity & activity, Verbosity lvl, const FormatOrString & fs) = 0;
+
+    virtual void stopActivity(Activity & activity) = 0;
+
+};
+
+class Activity
+{
+public:
+    Logger & logger;
+
+    Activity(Logger & logger, Verbosity lvl, const FormatOrString & fs)
+        : logger(logger)
+    {
+        logger.startActivity(*this, lvl, fs);
+    }
+
+    ~Activity()
+    {
+        logger.stopActivity(*this);
+    }
+};
+
+extern Logger * logger;
+
+Logger * makeDefaultLogger();
+
+extern Verbosity verbosity; /* suppress msgs > this */
+
+#define printMsg(level, f) \
+    do { \
+        if (level <= nix::verbosity) { \
+            logger->log(level, (f)); \
+        } \
+    } while (0)
+
+#define debug(f) printMsg(lvlDebug, f)
+
+void warnOnce(bool & haveWarned, const FormatOrString & fs);
+
+void writeToStderr(const string & s);
+
+}