kakoune/src/file.cc

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#include "file.hh"
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#include "buffer.hh"
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#include "buffer_manager.hh"
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#include "assert.hh"
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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
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#include <cstring>
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namespace Kakoune
{
bool isidentifier(char c)
{
return std::isalnum(c) or c == '_';
}
String parse_filename(const String& filename)
{
if (filename.length() >= 2 and filename[0] == '~' and filename[1] == '/')
return parse_filename("$HOME/" + filename.substr(2));
CharCount pos = 0;
String result;
for (CharCount i = 0; i < filename.length(); ++i)
{
if (filename[i] == '$' and (i == 0 or filename[i-1] != '\\'))
{
result += filename.substr(pos, i - pos);
CharCount end = i+1;
while (end != filename.length() and isidentifier(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)
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{
int fd = open(parse_filename(filename).c_str(), O_RDONLY);
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if (fd == -1)
{
if (errno == ENOENT)
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throw file_not_found(filename);
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throw file_access_error(filename, strerror(errno));
}
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String content;
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char buf[256];
while (true)
{
ssize_t size = read(fd, buf, 256);
if (size == -1 or size == 0)
break;
content += String(buf, buf + size);
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}
close(fd);
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)
throw file_not_found(filename);
throw file_access_error(filename, strerror(errno));
}
if (Buffer* buffer = BufferManager::instance().get_buffer(filename))
delete buffer;
Buffer* buffer = new Buffer(filename, Buffer::Type::File, "");
String content;
char buf[256];
bool crlf = false;
bool bom = false;
bool at_file_begin = true;
while (true)
{
ssize_t size = read(fd, buf, 256);
if (size == -1 or size == 0)
break;
ssize_t pos = 0;
// detect utf-8 byte order mark
if (at_file_begin and size >= 3 and
buf[0] == '\xEF' and buf[1] == '\xBB' and buf[2] == '\xBF')
{
bom = true;
pos = 3;
}
ssize_t start = pos;
while (pos < size+1)
{
if (buf[pos] == '\r' or pos == size)
{
if (buf[pos] == '\r')
crlf = true;
buffer->insert(buffer->end()-1, String(buf+start, buf+pos));
start = pos+1;
}
++pos;
}
at_file_begin = false;
}
close(fd);
OptionManager& option_manager = buffer->option_manager();
option_manager.set_option("eolformat", Option(crlf ? "crlf" : "lf"));
option_manager.set_option("BOM", Option(bom ? "utf-8" : "no"));
// if the file ended with a \n, remove the \n added by the buffer
if (*(buffer->end() - 2) == '\n')
buffer->erase(buffer->end() - 1, buffer->end());
// it never happened, buffer always was like that
buffer->reset_undo_data();
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));
}
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}
void write_buffer_to_file(const Buffer& buffer, const String& filename)
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{
String eolformat = buffer.option_manager()["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);
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if (fd == -1)
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throw file_access_error(filename, strerror(errno));
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if (buffer.option_manager()["BOM"].as_string() == "utf-8")
::write(fd, "\xEF\xBB\xBF", 3);
for (LineCount i = 0; i < buffer.line_count(); ++i)
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{
// 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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}
close(fd);
}
}