forked from lix-project/lix
4036185cb4
We can now write
throw Error("file '%s' not found", path);
instead of
throw Error(format("file '%s' not found") % path);
and similarly
printError("file '%s' not found", path);
instead of
printMsg(lvlError, format("file '%s' not found") % path);
88 lines
1.8 KiB
C++
88 lines
1.8 KiB
C++
#pragma once
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#include "types.hh"
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namespace nix {
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typedef enum {
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lvlError = 0,
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lvlInfo,
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lvlTalkative,
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lvlChatty,
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lvlDebug,
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lvlVomit
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} Verbosity;
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class Activity;
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class Logger
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{
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friend class Activity;
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public:
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virtual ~Logger() { }
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virtual void log(Verbosity lvl, const FormatOrString & fs) = 0;
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void log(const FormatOrString & fs)
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{
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log(lvlInfo, fs);
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}
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virtual void setExpected(const std::string & label, uint64_t value = 1) { }
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virtual void setProgress(const std::string & label, uint64_t value = 1) { }
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virtual void incExpected(const std::string & label, uint64_t value = 1) { }
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virtual void incProgress(const std::string & label, uint64_t value = 1) { }
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private:
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virtual void startActivity(Activity & activity, Verbosity lvl, const FormatOrString & fs) = 0;
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virtual void stopActivity(Activity & activity) = 0;
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};
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class Activity
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{
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public:
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Logger & logger;
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Activity(Logger & logger, Verbosity lvl, const FormatOrString & fs)
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: logger(logger)
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{
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logger.startActivity(*this, lvl, fs);
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}
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~Activity()
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{
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logger.stopActivity(*this);
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}
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};
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extern Logger * logger;
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Logger * makeDefaultLogger();
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extern Verbosity verbosity; /* suppress msgs > this */
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/* Print a message if the current log level is at least the specified
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level. Note that this has to be implemented as a macro to ensure
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that the arguments are evaluated lazily. */
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#define printMsg(level, args...) \
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do { \
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if (level <= nix::verbosity) { \
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logger->log(level, fmt(args)); \
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} \
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} while (0)
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#define printError(args...) printMsg(lvlError, args)
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#define printInfo(args...) printMsg(lvlInfo, args)
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#define debug(args...) printMsg(lvlDebug, args)
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void warnOnce(bool & haveWarned, const FormatOrString & fs);
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void writeToStderr(const string & s);
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}
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