util: Add function FormatParagraph to format paragraph to fixed-width

This is to be used for the `-version` and `-help` messages.
This commit is contained in:
Wladimir J. van der Laan 2014-06-10 16:02:29 +02:00
parent 96b733e996
commit 97789d374c
3 changed files with 51 additions and 0 deletions

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@ -351,4 +351,15 @@ BOOST_AUTO_TEST_CASE(test_ParseInt32)
BOOST_CHECK(!ParseInt32("32482348723847471234", NULL));
}
BOOST_AUTO_TEST_CASE(test_FormatParagraph)
{
BOOST_CHECK_EQUAL(FormatParagraph("", 79, 0), "");
BOOST_CHECK_EQUAL(FormatParagraph("test", 79, 0), "test");
BOOST_CHECK_EQUAL(FormatParagraph(" test", 79, 0), "test");
BOOST_CHECK_EQUAL(FormatParagraph("test test", 79, 0), "test test");
BOOST_CHECK_EQUAL(FormatParagraph("test test", 4, 0), "test\ntest");
BOOST_CHECK_EQUAL(FormatParagraph("testerde test ", 4, 0), "testerde\ntest");
BOOST_CHECK_EQUAL(FormatParagraph("test test", 4, 4), "test\n test");
}
BOOST_AUTO_TEST_SUITE_END()

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@ -1407,3 +1407,38 @@ std::string DateTimeStrFormat(const char* pszFormat, int64_t nTime)
ss << boost::posix_time::from_time_t(nTime);
return ss.str();
}
std::string FormatParagraph(const std::string in, size_t width, size_t indent)
{
std::stringstream out;
size_t col = 0;
size_t ptr = 0;
while(ptr < in.size())
{
// Find beginning of next word
ptr = in.find_first_not_of(' ', ptr);
if (ptr == std::string::npos)
break;
// Find end of next word
size_t endword = in.find_first_of(' ', ptr);
if (endword == std::string::npos)
endword = in.size();
// Add newline and indentation if this wraps over the allowed width
if (col > 0)
{
if ((col + endword - ptr) > width)
{
out << '\n';
for(size_t i=0; i<indent; ++i)
out << ' ';
col = 0;
} else
out << ' ';
}
// Append word
out << in.substr(ptr, endword - ptr);
col += endword - ptr;
ptr = endword;
}
return out.str();
}

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@ -286,6 +286,11 @@ inline std::string HexStr(const T& vch, bool fSpaces=false)
return HexStr(vch.begin(), vch.end(), fSpaces);
}
/** Format a paragraph of text to a fixed width, adding spaces for
* indentation to any added line.
*/
std::string FormatParagraph(const std::string in, size_t width=79, size_t indent=0);
inline int64_t GetPerformanceCounter()
{
int64_t nCounter = 0;