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#include "file.hh"
#include "buffer.hh"
#include "buffer_manager.hh"
#include "assert.hh"
#include "unicode.hh"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#include <cstring>
namespace Kakoune
{
String parse_filename(const String& filename)
{
if (filename.length() >= 2 and filename[0] == '~' and filename[1] == '/')
return parse_filename("$HOME/" + filename.substr(2_byte));
ByteCount pos = 0;
String result;
for (ByteCount i = 0; i < filename.length(); ++i)
{
if (filename[i] == '$' and (i == 0 or filename[i-1] != '\\'))
{
result += filename.substr(pos, i - pos);
ByteCount end = i+1;
while (end != filename.length() and is_word(filename[end]))
++end;
String var_name = filename.substr(i+1, end - i - 1);
const char* var_value = getenv(var_name.c_str());
if (var_value)
result += var_value;
pos = end;
}
}
if (pos != filename.length())
result += filename.substr(pos);
return result;
}
String read_file(const String& filename)
{
int fd = open(parse_filename(filename).c_str(), O_RDONLY);
if (fd == -1)
{
if (errno == ENOENT)
throw file_not_found(filename);
throw file_access_error(filename, strerror(errno));
}
auto close_fd = on_scope_end([fd]{ close(fd); });
String content;
char buf[256];
while (true)
{
ssize_t size = read(fd, buf, 256);
if (size == -1 or size == 0)
break;
content += String(buf, buf + size);
}
return content;
}
Buffer* create_buffer_from_file(const String& filename)
{
int fd = open(parse_filename(filename).c_str(), O_RDONLY);
if (fd == -1)
{
if (errno == ENOENT)
return nullptr;
throw file_access_error(filename, strerror(errno));
}
struct stat st;
fstat(fd, &st);
if (S_ISDIR(st.st_mode))
{
close(fd);
throw file_access_error(filename, "is a directory");
}
const char* data = (const char*)mmap(nullptr, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
auto cleanup = on_scope_end([&]{ munmap((void*)data, st.st_size); close(fd); });
if (Buffer* buffer = BufferManager::instance().get_buffer(filename))
delete buffer;
const char* pos = data;
bool crlf = false;
bool bom = false;
if (st.st_size >= 3 and
data[0] == '\xEF' and data[1] == '\xBB' and data[2] == '\xBF')
{
bom = true;
pos = data + 3;
}
std::vector<String> lines;
const char* end = data + st.st_size;
while (pos < end)
{
const char* line_end = pos;
while (line_end < end and *line_end != '\r' and *line_end != '\n')
++line_end;
// this should happen only when opening a file which has no
// end of line as last character.
if (line_end == end)
{
lines.emplace_back(pos, line_end);
lines.back() += '\n';
break;
}
lines.emplace_back(pos, line_end + 1);
lines.back().back() = '\n';
if (line_end+1 != end and *line_end == '\r' and *(line_end+1) == '\n')
{
crlf = true;
pos = line_end + 2;
}
else
pos = line_end + 1;
}
Buffer* buffer = new Buffer(filename, Buffer::Flags::File, std::move(lines));
OptionManager& options = buffer->options();
options.set_option("eolformat", Option(crlf ? "crlf" : "lf"));
options.set_option("BOM", Option(bom ? "utf-8" : "no"));
return buffer;
}
static void write(int fd, const memoryview<char>& data, const String& filename)
{
const char* ptr = data.pointer();
ssize_t count = data.size();
while (count)
{
ssize_t written = ::write(fd, ptr, count);
ptr += written;
count -= written;
if (written == -1)
throw file_access_error(filename, strerror(errno));
}
}
void write_buffer_to_file(const Buffer& buffer, const String& filename)
{
String eolformat = buffer.options()["eolformat"].as_string();
if (eolformat == "crlf")
eolformat = "\r\n";
else
eolformat = "\n";
auto eoldata = eolformat.data();
int fd = open(parse_filename(filename).c_str(),
O_CREAT | O_WRONLY | O_TRUNC, 0644);
if (fd == -1)
throw file_access_error(filename, strerror(errno));
auto close_fd = on_scope_end([fd]{ close(fd); });
if (buffer.options()["BOM"].as_string() == "utf-8")
::write(fd, "\xEF\xBB\xBF", 3);
for (LineCount i = 0; i < buffer.line_count(); ++i)
{
// end of lines are written according to eolformat but always
// stored as \n
memoryview<char> linedata = buffer.line_content(i).data();
write(fd, linedata.subrange(0, linedata.size()-1), filename);
write(fd, eoldata, filename);
}
}
}
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