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Merge pull request #8732 from ClickHouse/minimal-readline-support

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Minimal readline support if replxx was not enabled.
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alexey-milovidov 2020-01-20 22:29:22 +03:00 committed by GitHub
commit 33e6593e3c
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1 changed files with 43 additions and 5 deletions
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48
libs/libcommon/src/LineReader.cpp
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@ -2,7 +2,17 @@
#include <common/LineReader.h>
#if USE_REPLXX
# include <replxx.hxx>
#include <replxx.hxx>
#else
/// We can detect if code is linked with one or another readline variants or open the library dynamically.
#include <dlfcn.h>
extern "C"
{
char * readline(const char *) __attribute__((__weak__));
char * (*readline_ptr)(const char *) = readline;
}
#endif
#include <iostream>
@ -146,10 +156,38 @@ LineReader::InputStatus LineReader::readOneLine(const String & prompt)
return (errno != EAGAIN) ? ABORT : RESET_LINE;
input = cinput;
#else
std::cout << prompt;
std::getline(std::cin, input);
if (!std::cin.good())
return ABORT;
if (!readline_ptr)
{
for (auto name : {"libreadline.so", "libreadline.so.0", "libeditline.so", "libeditline.so.0"})
{
void * dl_handle = dlopen(name, RTLD_LAZY);
if (dl_handle)
{
readline_ptr = reinterpret_cast<char * (*)(const char *)>(dlsym(dl_handle, "readline"));
if (readline_ptr)
{
break;
}
}
}
}
/// Minimal support for readline
if (readline_ptr)
{
char * line_read = (*readline_ptr)(prompt.c_str());
if (!line_read)
return ABORT;
input = line_read;
}
else
{
std::cout << prompt;
std::getline(std::cin, input);
if (!std::cin.good())
return ABORT;
}
#endif
trim(input);