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refs #539 Time-based file search utility functions.

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This commit is contained in:
Mathew Sutcliffe
2016-02-04 22:09:48 +00:00
parent a88f5e33e3
commit d6b9fe6f95
2 changed files with 84 additions and 0 deletions
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66
src/blackmisc/fileutils.cpp
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@@ -87,4 +87,70 @@ namespace BlackMisc
return true;
}
QString CFileUtils::findFirstFile(const QDir &dir, bool recursive, const QString &wildcard, std::function<bool(const QFileInfo &)> predicate)
{
QFileInfoList result = dir.entryInfoList({ wildcard }, QDir::Files);
if (predicate)
{
auto it = std::find_if(result.cbegin(), result.cend(), predicate);
if (it != result.cend()) { return it->filePath(); }
}
else
{
if (! result.isEmpty()) { return result.first().filePath(); }
}
if (recursive)
{
for (const auto &subdir : dir.entryInfoList(QDir::Dirs | QDir::NoDotAndDotDot))
{
QString first = findFirstFile(subdir.filePath(), true, wildcard, predicate);
if (! first.isEmpty()) { return first; }
}
}
return {};
}
bool CFileUtils::containsFile(const QDir &dir, bool recursive, const QString &wildcard, std::function<bool(const QFileInfo &)> predicate)
{
return ! findFirstFile(dir, recursive, wildcard, predicate).isEmpty();
}
QString CFileUtils::findFirstNewerThan(const QDateTime &time, const QDir &dir, bool recursive, const QString &wildcard)
{
return findFirstFile(dir, recursive, wildcard, [time](const QFileInfo &fi) { return fi.lastModified() > time; });
}
bool CFileUtils::containsFileNewerThan(const QDateTime &time, const QDir &dir, bool recursive, const QString &wildcard)
{
return ! findFirstNewerThan(time, dir, recursive, wildcard).isEmpty();
}
QFileInfoList CFileUtils::enumerateFiles(const QDir &dir, bool recursive, const QString &wildcard, std::function<bool(const QFileInfo &)> predicate)
{
QFileInfoList result = dir.entryInfoList({ wildcard }, QDir::Files);
if (predicate)
{
result.erase(std::remove_if(result.begin(), result.end(), std::not1(predicate)), result.end());
}
if (recursive)
{
for (const auto &subdir : dir.entryInfoList(QDir::Dirs | QDir::NoDotAndDotDot))
{
result += enumerateFiles(subdir.filePath(), true, wildcard, predicate);
}
}
return result;
}
QString CFileUtils::findNewestFile(const QDir &dir, bool recursive, const QString &wildcard)
{
const QFileInfoList files = enumerateFiles(dir, recursive, wildcard);
if (files.isEmpty()) { return {}; }
auto it = std::max_element(files.cbegin(), files.cend(), [](const QFileInfo &a, const QFileInfo &b)
{
return a.lastModified() < b.lastModified();
});
return it->filePath();
}
} // ns

18
src/blackmisc/fileutils.h
View File

@@ -43,6 +43,24 @@ namespace BlackMisc
//! If `sourceDir` is a directory, copies it recursively, so that `sourceDir` becomes `destinationDir`.
//! If it is a file, just copies the file.
static bool copyRecursively(const QString &sourceDir, const QString &destinationDir);
//! Returns path to first file in dir which matches the optional wildcard and predicate, or empty string.
static QString findFirstFile(const QDir &dir, bool recursive, const QString &wildcard = {}, std::function<bool(const QFileInfo &)> predicate = {});
//! True if there exists a file in dir which matches the optional wildcard and predicate.
static bool containsFile(const QDir &dir, bool recursive, const QString &wildcard = {}, std::function<bool(const QFileInfo &)> predicate = {});
//! Returns path to first file in dir newer than the given time, optionally matching a wildcard, or empty string.
static QString findFirstNewerThan(const QDateTime &time, const QDir &dir, bool recursive, const QString &wildcard = {});
//! True if there exists a file in dir newer than the given time, optionally matching a wildcard.
static bool containsFileNewerThan(const QDateTime &time, const QDir &dir, bool recursive, const QString &wildcard = {});
//! Returns list of all files in dir, optionally matching a wildcard and predicate.
static QFileInfoList enumerateFiles(const QDir &dir, bool recursive, const QString &wildcard = {}, std::function<bool(const QFileInfo &)> predicate = {});
//! Returns path to the newest file in dir, optionally matching a wildcard, or empty string.
static QString findNewestFile(const QDir &dir, bool recursive, const QString &wildcard = {});
};
} // ns