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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"
#include "buffer_utils.hh"
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#include "debug.hh"
#include "unicode.hh"
#include "regex.hh"
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#include "string.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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#if defined(__APPLE__)
#include <mach-o/dyld.h>
#endif
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namespace Kakoune
{
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String parse_filename(StringView filename)
{
if (filename.length() >= 1 and filename[0_byte] == '~' and
(filename.length() == 1 or filename[1_byte] == '/'))
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return parse_filename("$HOME"_str + filename.substr(1_byte));
ByteCount pos = 0;
String result;
for (ByteCount i = 0; i < filename.length(); ++i)
{
if (filename[i] == '$' 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;
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StringView var_name = filename.substr(i+1, end - i - 1);
const char* var_value = getenv(var_name.zstr());
if (var_value)
result += var_value;
pos = end;
}
}
if (pos != filename.length())
result += filename.substr(pos);
return result;
}
std::pair<StringView, StringView> split_path(StringView path)
{
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auto it = find(reversed(path), '/');
if (it == path.rend())
return { {}, path };
const char* slash = it.base()-1;
return { {path.begin(), slash+1}, {slash+1, path.end()} };
}
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String real_path(StringView filename)
{
char buffer[PATH_MAX+1];
StringView existing = filename;
StringView non_existing;
while (true)
{
char* res = realpath(existing.zstr(), buffer);
if (res)
{
if (non_existing.empty())
return res;
return format("{}/{}", res, non_existing);
}
auto it = find(existing.rbegin(), existing.rend(), '/');
if (it == existing.rend())
return filename.str();
existing = StringView{existing.begin(), it.base()-1};
non_existing = StringView{it.base(), filename.end()};
}
}
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String compact_path(StringView 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))
return real_filename.substr(real_cwd.length()).str();
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);
}
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return filename.str();
}
String read_fd(int 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;
}
String read_file(StringView 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); });
return read_fd(fd);
}
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Buffer* create_buffer_from_file(StringView filename)
{
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String real_filename = real_path(parse_filename(filename));
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int fd = open(real_filename.c_str(), O_RDONLY);
if (fd == -1)
{
if (errno == ENOENT)
return nullptr;
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throw file_access_error(real_filename, strerror(errno));
}
auto close_fd = on_scope_end([&]{ close(fd); });
struct stat st;
fstat(fd, &st);
if (S_ISDIR(st.st_mode))
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throw file_access_error(real_filename, "is a directory");
const char* data = (const char*)mmap(nullptr, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
auto unmap = on_scope_end([&]{ munmap((void*)data, st.st_size); });
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return create_buffer_from_data({data, data + st.st_size}, real_filename,
Buffer::Flags::File, st.st_mtime);
}
static void write(int fd, StringView data)
{
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const char* ptr = data.data();
ssize_t count = (int)data.length();
while (count)
{
ssize_t written = ::write(fd, ptr, count);
ptr += written;
count -= written;
if (written == -1)
throw file_access_error("fd: " + to_string(fd), strerror(errno));
}
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}
void write_buffer_to_fd(Buffer& buffer, int fd)
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{
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const String& eolformat = buffer.options()["eolformat"].get<String>();
StringView eoldata;
if (eolformat == "crlf")
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eoldata = "\r\n";
else
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eoldata = "\n";
if (buffer.options()["BOM"].get<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
StringView linedata = buffer[i];
write(fd, linedata.substr(0, linedata.length()-1));
write(fd, eoldata);
}
}
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void write_buffer_to_file(Buffer& buffer, StringView filename)
{
buffer.run_hook_in_own_context("BufWritePre", buffer.name());
{
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); });
write_buffer_to_fd(buffer, fd);
}
if ((buffer.flags() & Buffer::Flags::File) and
real_path(filename) == real_path(buffer.name()))
buffer.notify_saved();
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buffer.run_hook_in_own_context("BufWritePost", buffer.name());
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}
void write_buffer_to_backup_file(Buffer& buffer)
{
String path = real_path(buffer.name());
StringView dir, file;
std::tie(dir,file) = split_path(path);
char pattern[PATH_MAX];
if (dir.empty())
format_to(pattern, ".{}.kak.XXXXXX", file);
else
format_to(pattern, "{}/.{}.kak.XXXXXX", dir, file);
int fd = mkstemp(pattern);
if (fd >= 0)
{
write_buffer_to_fd(buffer, fd);
close(fd);
}
}
String find_file(StringView filename, ConstArrayView<String> paths)
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{
struct stat buf;
if (filename.length() > 1 and filename[0_byte] == '/')
{
if (stat(filename.zstr(), &buf) == 0 and S_ISREG(buf.st_mode))
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return filename.str();
return "";
}
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if (filename.length() > 2 and
filename[0_byte] == '~' and filename[1_byte] == '/')
{
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String candidate = getenv("HOME") + filename.substr(1_byte).str();
if (stat(candidate.c_str(), &buf) == 0 and S_ISREG(buf.st_mode))
return candidate;
return "";
}
for (auto candidate : paths)
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{
if (not candidate.empty() and candidate.back() != '/')
candidate += '/';
candidate += filename;
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if (stat(candidate.c_str(), &buf) == 0 and S_ISREG(buf.st_mode))
return candidate;
}
return "";
}
template<typename Filter>
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Vector<String> list_files(StringView prefix, StringView dirname,
Filter filter)
{
kak_assert(dirname.empty() or dirname.back() == '/');
DIR* dir = opendir(dirname.empty() ? "./" : dirname.zstr());
if (not dir)
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return {};
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auto closeDir = on_scope_end([=]{ closedir(dir); });
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Vector<String> result;
Vector<String> subseq_result;
while (dirent* entry = readdir(dir))
{
if (not filter(*entry))
continue;
String filename = entry->d_name;
if (filename.empty())
continue;
const bool match_prefix = prefix_match(filename, prefix);
const bool match_subseq = subsequence_match(filename, prefix);
struct stat st;
if ((match_prefix or match_subseq) and
stat((dirname + filename).c_str(), &st) == 0)
{
if (S_ISDIR(st.st_mode))
filename += '/';
if (prefix.length() != 0 or filename[0_byte] != '.')
{
if (match_prefix)
result.push_back(filename);
if (match_subseq)
subseq_result.push_back(filename);
}
}
}
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return result.empty() ? subseq_result : result;
}
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CandidateList complete_filename(StringView prefix,
const Regex& ignored_regex,
ByteCount cursor_pos)
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{
String real_prefix = parse_filename(prefix.substr(0, cursor_pos));
StringView dirname, fileprefix;
std::tie(dirname, fileprefix) = split_path(real_prefix);
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const bool check_ignored_regex = not ignored_regex.empty() and
not regex_match(fileprefix.begin(), fileprefix.end(), ignored_regex);
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auto filter = [&](const dirent& entry)
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{
return not check_ignored_regex or
not regex_match(entry.d_name, ignored_regex);
};
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Vector<String> res = list_files(fileprefix, dirname, filter);
for (auto& file : res)
file = dirname + file;
std::sort(res.begin(), res.end());
return res;
}
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Vector<String> complete_command(StringView prefix, ByteCount cursor_pos)
{
String real_prefix = parse_filename(prefix.substr(0, cursor_pos));
StringView dirname, fileprefix;
std::tie(dirname, fileprefix) = split_path(real_prefix);
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if (not dirname.empty())
{
auto filter = [&](const dirent& entry)
{
struct stat st;
if (stat((dirname.str() + entry.d_name).c_str(), &st))
return false;
bool executable = (st.st_mode & S_IXUSR)
| (st.st_mode & S_IXGRP)
| (st.st_mode & S_IXOTH);
return S_ISDIR(st.st_mode) or (S_ISREG(st.st_mode) and executable);
};
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Vector<String> res = list_files(fileprefix, dirname, filter);
for (auto& file : res)
file = dirname + file;
std::sort(res.begin(), res.end());
return res;
}
typedef decltype(stat::st_mtime) TimeSpec;
struct CommandCache
{
TimeSpec mtime = {};
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Vector<String> commands;
};
static UnorderedMap<String, CommandCache> command_cache;
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Vector<String> res;
for (auto dir : split(getenv("PATH"), ':'))
{
String dirname = dir.str();
if (not dirname.empty() and dirname.back() != '/')
dirname += '/';
struct stat st;
if (stat(dirname.substr(0_byte, dirname.length() - 1).zstr(), &st))
continue;
auto& cache = command_cache[dirname];
if (memcmp(&cache.mtime, &st.st_mtime, sizeof(TimeSpec)) != 0)
{
auto filter = [&](const dirent& entry) {
struct stat st;
if (stat((dirname + entry.d_name).c_str(), &st))
return false;
bool executable = (st.st_mode & S_IXUSR)
| (st.st_mode & S_IXGRP)
| (st.st_mode & S_IXOTH);
return S_ISREG(st.st_mode) and executable;
};
cache.commands = list_files("", dirname, filter);
memcpy(&cache.mtime, &st.st_mtime, sizeof(TimeSpec));
}
for (auto& cmd : cache.commands)
{
if (prefix_match(cmd, fileprefix))
res.push_back(cmd);
}
}
std::sort(res.begin(), res.end());
auto it = std::unique(res.begin(), res.end());
res.erase(it, res.end());
return res;
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}
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time_t get_fs_timestamp(StringView filename)
{
struct stat st;
if (stat(filename.zstr(), &st) != 0)
return InvalidTime;
return st.st_mtime;
}
String get_kak_binary_path()
{
char buffer[2048];
#if defined(__linux__) or defined(__CYGWIN__)
ssize_t res = readlink("/proc/self/exe", buffer, 2048);
kak_assert(res != -1);
buffer[res] = '\0';
return buffer;
#elif defined(__APPLE__)
uint32_t bufsize = 2048;
_NSGetExecutablePath(buffer, &bufsize);
char* canonical_path = realpath(buffer, nullptr);
String path = canonical_path;
free(canonical_path);
return path;
#else
# error "finding executable path is not implemented on this platform"
#endif
}
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}