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#include "scanner.ih"
/*
Example of diff-output:
33c33
< 90d8b506d249634c4ff80b9018644567 out
---
> b88d0b77db74cc4a742d7bc26cdd2a1e out
*/
bool Scanner::noDifferences(std::string const ¤t,
std::string const &logfile)
{
Util::debug() << "Scanner::noDifferences(): started " <<
d_sorter["DIFF"] << " " << current << " " << logfile << endl;
d_shFork << d_sorter["DIFF"] << " " << current << " " << logfile <<
endl <<
"/bin/echo \"" << d_sentinel << "\"" << endl;
HashString< pair<string, vector<string> > > status;
Util::debug() << "Scanner::noDifferences(): " << "/bin/echo " <<
d_sentinel << endl;
// key is string, case sensitive.
//
// The last element of the lines produced by diff is used as the
// key. For the current function to operate sensibly, this should be
// a filename or path/file.
//
// If the first character of the line is a < or >, then a modification is
// detected: for these lines the following happens:
// 1. If the key already existed its .first element is set to
// "modified". If the key didn't exist yet, it is set to
// "added" at at '<', and to "removed" at a '>'
// 2. The line itself is pushed back to the .second (vector) element
// of the pair.
//
// At the end, if the hashtable has any elements, the table is inserted
// into the d_reporter and `false' is returned. If the hashtable contains
// no elements, 'true' is returned.
string s;
// Pattern split("(\\S+)\\s*$");
Util::debug() << "Scanner::noDifferences(): starting to read lines" <<
endl;
// if (!d_shFork.available())
// d_reporter.exit() << "`" << d_sorter["SH"] << "': no output from " <<
// d_sorter["DIFF"] << endl;
while (getline(d_shFork, s))
{
Util::debug() << "Scanner::noDifferences(): got: `" << s <<
"'\n" <<
"Scanner::noDifferences(): sentinel: `" << d_sentinel <<
"'" << endl;
if (s == d_sentinel)
break;
if (!(s_split << s))
continue; // no match at empty lines ?
string key = s_split[1]; // get the key
bool exists = status.count(key);
if (s[0] == '>') // removal, e.g., > b88d0b.... out
status[key].first = exists ? "MODIFIED" : "REMOVED";
else if (s[0] == '<')
status[key].first = exists ? "MODIFIED" : "ADDED";
else
continue;
status[key].second.push_back(s);
}
if (!status.size()) // no elements ?
{
Util::debug() << "no differences were observed" << endl;
rename(current.c_str(), logfile.c_str()); // install `logfile'
return true; // nothing to report
}
if (d_label.length())
d_reporter << d_label << endl;
for
(
HashString< pair<string, vector<string> > >::iterator
begin = status.begin(), end = status.end();
begin != end;
begin++
)
{
d_reporter << begin->second.first << ": " << begin->first << endl;
for
(
vector<string>::iterator
sbegin = begin->second.second.begin(),
send = begin->second.second.end();
sbegin != send;
sbegin++
)
d_reporter << " " << *sbegin << endl;
}
string
datetime = logfile + "." + Util::datetime();
rename(logfile.c_str(), datetime.c_str());
rename(current.c_str(), logfile.c_str()); // install `logfile'
Util::debug() << "differences were observed: see `" <<
d_sorter["REPORT"] << "' and `" << logfile << "'" << endl;
return false;
}
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