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#include "history.h"
#include <fstream>
namespace newsboat {
History::History()
: idx(0)
{
}
History::~History() {}
void History::add_line(const std::string& line)
{
/*
* When a line is added, we need to do so and
* reset the index so that the next prev/next
* operations start from the beginning again.
*/
if (line.length() > 0) {
lines.insert(lines.begin(), line);
}
idx = 0;
}
std::string History::prev()
{
if (idx < lines.size()) {
return lines[idx++];
}
if (lines.size() == 0) {
return "";
}
return lines[idx - 1];
}
std::string History::next()
{
if (idx > 0) {
return lines[--idx];
}
return "";
}
void History::load_from_file(const std::string& file)
{
std::fstream f;
f.open(file.c_str(), std::fstream::in);
if (f.is_open()) {
std::string line;
do {
std::getline(f, line);
if (!f.eof() && line.length() > 0) {
add_line(line);
}
} while (!f.eof());
}
}
void History::save_to_file(const std::string& file, unsigned int limit)
{
if (limit == 0) {
return;
}
std::fstream f;
f.open(file.c_str(), std::fstream::out | std::fstream::trunc);
if (f.is_open()) {
if (limit > lines.size())
limit = lines.size();
if (limit > 0) {
for (unsigned int i = limit - 1; i > 0; i--) {
f << lines[i] << std::endl;
}
f << lines[0] << std::endl;
}
}
}
} // namespace newsboat
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