#pragma once

#include "config.h"

#include <string>
#include <list>
#include <set>

#include <boost/format.hpp>

/* Before 4.7, gcc's std::exception uses empty throw() specifiers for
 * its (virtual) destructor and what() in c++11 mode, in violation of spec
 */
#ifdef __GNUC__
#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
#define EXCEPTION_NEEDS_THROW_SPEC
#endif
#endif


namespace nix {


/* Inherit some names from other namespaces for convenience. */
using std::string;
using std::list;
using std::set;
using std::vector;
using boost::format;


struct FormatOrString
{
    string s;
    FormatOrString(const string & s) : s(s) { };
    FormatOrString(const format & f) : s(f.str()) { };
    FormatOrString(const char * s) : s(s) { };
};


/* BaseError should generally not be caught, as it has Interrupted as
   a subclass. Catch Error instead. */
class BaseError : public std::exception
{
protected:
    string prefix_; // used for location traces etc.
    string err;
public:
    unsigned int status; // exit status
    BaseError(const FormatOrString & fs, unsigned int status = 1);
#ifdef EXCEPTION_NEEDS_THROW_SPEC
    ~BaseError() throw () { };
    const char * what() const throw () { return err.c_str(); }
#else
    const char * what() const noexcept { return err.c_str(); }
#endif
    const string & msg() const { return err; }
    const string & prefix() const { return prefix_; }
    BaseError & addPrefix(const FormatOrString & fs);
};

#define MakeError(newClass, superClass) \
    class newClass : public superClass                  \
    {                                                   \
    public:                                             \
        newClass(const FormatOrString & fs, unsigned int status = 1) : superClass(fs, status) { }; \
    };

MakeError(Error, BaseError)

class SysError : public Error
{
public:
    int errNo;
    SysError(const FormatOrString & fs);
};


typedef list<string> Strings;
typedef set<string> StringSet;


/* Paths are just strings. */
typedef string Path;
typedef list<Path> Paths;
typedef set<Path> PathSet;


typedef enum {
    lvlError = 0,
    lvlInfo,
    lvlTalkative,
    lvlChatty,
    lvlDebug,
    lvlVomit
} Verbosity;


}
d3c82044648b2&amp;showmsg=1'>NEWS</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/NEWS?id=eaa1cc3bb6d61840a9ce507ffe3d3c82044648b2'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2020-04-15 00:02:23 +0200'>2020-04-15</span></td><td class='logsubject'><a href='/guix/commit/NEWS?id=d62c9b2671be55ae0305bebfda17b595f33797f2'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
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<tr class='logheader'><td><span title='2020-04-12 17:05:21 +0200'>2020-04-12</span></td><td class='logsubject'><a href='/guix/commit/NEWS?id=6945c43754308f64ad177fd29fa515959243f155'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
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<tr class='logheader'><td><span title='2020-04-09 22:56:56 +0200'>2020-04-09</span></td><td class='logsubject'><a href='/guix/commit/NEWS?id=f9adf3559543bdbcecad45280c9c626b63e84e95'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
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<tr class='logheader'><td><span title='2019-05-17 11:25:51 +0200'>2019-05-17</span></td><td class='logsubject'><a href='/guix/commit/NEWS?id=c34684b6bc32c76b2383cf3641dad1b059fd84fc'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
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<tr class='logheader'><td><span title='2019-05-16 18:52:27 +0200'>2019-05-16</span></td><td class='logsubject'><a href='/guix/commit/NEWS?id=22872f766615ed5ae300b6bc1212e3001f46a0e9'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
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<tr class='logheader'><td><span title='2019-05-01 12:10:42 +0200'>2019-05-01</span></td><td class='logsubject'><a href='/guix/commit/NEWS?id=6298c3ffd9654d3231a6f25390b056483e8f407c'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
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<tr class='logheader'><td><span title='2019-04-29 11:31:23 +0200'>2019-04-29</span></td><td class='logsubject'><a href='/guix/commit/NEWS?id=2f8198dfed1de935dfc60510a5514e5c289c3fc7'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
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<tr class='logheader'><td><span title='2019-04-28 22:57:07 +0200'>2019-04-28</span></td><td class='logsubject'><a href='/guix/commit/NEWS?id=7dac61143d9911ad02e239a44b17bd40f06d47a6'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
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<tr class='logheader'><td><span title='2018-12-05 00:11:22 +0100'>2018-12-05</span></td><td class='logsubject'><a href='/guix/commit/NEWS?id=eeedb094ec93ac63e92f733165a3e6883f6002ba'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
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<tr class='logheader'><td><span title='2018-12-05 00:08:28 +0100'>2018-12-05</span></td><td class='logsubject'><a href='/guix/commit/NEWS?id=273cce9875a1deba2b6669099e69824db55c9622'>Update NEWS.</a></td><td>Ludovic Courtès</td></tr>
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