kakoune/src/file.cc

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#include "file.hh"
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#include "assert.hh"
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#include "buffer.hh"
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#include "buffer_manager.hh"
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#include "completion.hh"
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#include "debug.hh"
#include "unicode.hh"
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#include <errno.h>
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#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
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#include <fcntl.h>
#include <unistd.h>
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#include <dirent.h>
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namespace Kakoune
{
String parse_filename(const String& filename)
{
if (filename.length() >= 1 and filename[0] == '~' and
(filename.length() == 1 or filename[1] == '/'))
return parse_filename("$HOME" + filename.substr(1_byte));
ByteCount pos = 0;
String result;
for (ByteCount i = 0; i < filename.length(); ++i)
{
if (filename[i] == '$' 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 real_path(const String& filename)
{
String dirname = ".";
String basename = filename;
auto it = find(reversed(filename), '/');
if (it != filename.rend())
{
dirname = String{filename.begin(), it.base()};
basename = String{it.base(), filename.end()};
}
char buffer[PATH_MAX+1];
char* res = realpath(dirname.c_str(), buffer);
if (not res)
throw file_not_found{dirname};
return res + "/"_str + basename;
}
String compact_path(const String& filename)
{
String real_filename = real_path(filename);
char cwd[1024];
getcwd(cwd, 1024);
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String real_cwd = real_path(cwd) + '/';
if (prefix_match(real_filename, real_cwd))
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return real_filename.substr(real_cwd.length());
const char* home = getenv("HOME");
if (home)
{
ByteCount home_len = (int)strlen(home);
if (real_filename.substr(0, home_len) == home)
return "~" + real_filename.substr(home_len);
}
return filename;
}
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));
}
auto close_fd = on_scope_end([fd]{ close(fd); });
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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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}
return content;
}
Buffer* create_buffer_from_file(String filename)
{
filename = real_path(parse_filename(filename));
int fd = open(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); });
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';
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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 = BufferManager::instance().get_buffer_ifp(filename);
if (buffer)
buffer->reload(std::move(lines), st.st_mtime);
else
buffer = new Buffer{filename, Buffer::Flags::File,
std::move(lines), st.st_mtime};
OptionManager& options = buffer->options();
options.get_local_option("eolformat").set<String>(crlf ? "crlf" : "lf");
options.get_local_option("BOM").set<String>(bom ? "utf-8" : "no");
return buffer;
}
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static void write(int fd, 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(Buffer& buffer, const String& filename)
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{
String eolformat = buffer.options()["eolformat"].get<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));
auto close_fd = on_scope_end([fd]{ close(fd); });
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if (buffer.options()["BOM"].get<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[i].data();
write(fd, linedata.subrange(0, linedata.size()-1), filename);
write(fd, eoldata, filename);
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}
if ((buffer.flags() & Buffer::Flags::File) and filename == buffer.name())
buffer.notify_saved();
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}
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String find_file(const String& filename, memoryview<String> paths)
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{
for (auto candidate : paths)
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{
if (not candidate.empty() and candidate.back() != '/')
candidate += '/';
candidate += filename;
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struct stat buf;
if (stat(candidate.c_str(), &buf) == 0 and S_ISREG(buf.st_mode))
return candidate;
}
return "";
}
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std::vector<String> complete_filename(const String& prefix,
const Regex& ignored_regex,
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ByteCount cursor_pos)
{
String real_prefix = parse_filename(prefix.substr(0, cursor_pos));
String dirname = "./";
String dirprefix;
String fileprefix = real_prefix;
ByteCount dir_end = -1;
for (ByteCount i = 0; i < real_prefix.length(); ++i)
{
if (real_prefix[i] == '/')
dir_end = i;
}
if (dir_end != -1)
{
dirname = real_prefix.substr(0, dir_end + 1);
dirprefix = dirname;
fileprefix = real_prefix.substr(dir_end + 1);
}
DIR* dir = opendir(dirname.c_str());
auto closeDir = on_scope_end([=]{ closedir(dir); });
std::vector<String> result;
if (not dir)
return result;
const bool check_ignored_regex = not ignored_regex.empty() and
not boost::regex_match(fileprefix.c_str(), ignored_regex);
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std::vector<String> subseq_result;
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while (dirent* entry = readdir(dir))
{
String filename = entry->d_name;
if (filename.empty())
continue;
if (check_ignored_regex and boost::regex_match(filename.c_str(), ignored_regex))
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continue;
const bool match_prefix = prefix_match(filename, fileprefix);
const bool match_subseq = subsequence_match(filename, fileprefix);
if (match_prefix or match_subseq)
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{
String name = dirprefix + filename;
if (entry->d_type == DT_DIR)
name += '/';
if (fileprefix.length() != 0 or filename[0] != '.')
{
if (match_prefix)
result.push_back(escape(name));
if (match_subseq)
subseq_result.push_back(escape(name));
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}
}
}
auto& real_result = result.empty() ? subseq_result : result;
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std::sort(real_result.begin(), real_result.end());
return real_result;
}
time_t get_fs_timestamp(const String& filename)
{
struct stat st;
if (stat(filename.c_str(), &st) != 0)
return InvalidTime;
return st.st_mtime;
}
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}