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#include "logging.hh"
#include "nixexpr.hh"
#include <iostream>
#include <optional>
using namespace nix;
MakeError(DemoError, Error);
int main()
{
verbosity = lvlVomit;
// In each program where errors occur, this has to be set.
ErrorInfo::programName = std::optional("error-demo");
// 'DemoError' appears as error name.
try {
throw DemoError("demo error was thrown");
} catch (Error &e) {
logger->logEI(e.info());
}
// appending to the hint from the previous error
try {
auto e = Error("initial error");
throw DemoError(e.info());
} catch (Error &e) {
ErrorInfo ei = e.info();
// using normaltxt to avoid the default yellow highlighting.
ei.hint = hintfmt("%s; subsequent error message.",
normaltxt(e.info().hint ? e.info().hint->str() : ""));
logger->logEI(ei);
}
// SysError; picks up errno
try {
auto x = readFile(-1);
}
catch (SysError &e) {
std::cout << "errno was: " << e.errNo << std::endl;
logError(e.info());
}
// current exception
try {
throw DemoError("DemoError handled as a %1%", "std::exception");
}
catch (...) {
const std::exception_ptr &eptr = std::current_exception();
try
{
std::rethrow_exception(eptr);
}
catch (std::exception& e)
{
std::cerr << e.what() << std::endl;
}
}
// For completeness sake, show 'info' through 'vomit' levels.
// But this is maybe a heavy format for those.
logger->logEI(
ErrorInfo { .level = lvlInfo,
.name = "Info name",
.description = "Info description",
});
logger->logEI(
ErrorInfo { .level = lvlTalkative,
.name = "Talkative name",
.description = "Talkative description",
});
logger->logEI(
ErrorInfo { .level = lvlChatty,
.name = "Chatty name",
.description = "Chatty description",
});
logger->logEI(
ErrorInfo { .level = lvlDebug,
.name = "Debug name",
.description = "Debug description",
});
logger->logEI(
ErrorInfo { .level = lvlVomit,
.name = "Vomit name",
.description = "Vomit description",
});
// Error in a program; no hint and no nix code.
logError(
ErrorInfo { .name = "name",
.description = "error description",
});
// Warning with name, description, and hint.
// The hintfmt function makes all the substituted text yellow.
logWarning(
ErrorInfo { .name = "name",
.description = "error description",
.hint = hintfmt("there was a %1%", "warning"),
});
// Warning with nix file, line number, column, and the lines of
// code where a warning occurred.
SymbolTable testTable;
auto problem_file = testTable.create("myfile.nix");
logWarning(
ErrorInfo { .name = "warning name",
.description = "warning description",
.hint = hintfmt("this hint has %1% templated %2%!!",
"yellow",
"values"),
.nixCode = NixCode {
.errPos = Pos(problem_file, 40, 13),
.prevLineOfCode = std::nullopt,
.errLineOfCode = "this is the problem line of code",
.nextLineOfCode = std::nullopt
}});
// Error with previous and next lines of code.
logError(
ErrorInfo { .name = "error name",
.description = "error with code lines",
.hint = hintfmt("this hint has %1% templated %2%!!",
"yellow",
"values"),
.nixCode = NixCode {
.errPos = Pos(problem_file, 40, 13),
.prevLineOfCode = "previous line of code",
.errLineOfCode = "this is the problem line of code",
.nextLineOfCode = "next line of code",
}});
// Error without lines of code.
logError(
ErrorInfo { .name = "error name",
.description = "error without any code lines.",
.hint = hintfmt("this hint has %1% templated %2%!!",
"yellow",
"values"),
.nixCode = NixCode {
.errPos = Pos(problem_file, 40, 13)
}});
// Error with only hint and name..
logError(
ErrorInfo { .name = "error name",
.hint = hintfmt("hint %1%", "only"),
.nixCode = NixCode {
.errPos = Pos(problem_file, 40, 13)
}});
return 0;
}
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