112 lines
2.6 KiB
C++
112 lines
2.6 KiB
C++
#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>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <cstring>
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namespace Kakoune
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{
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bool isidentifier(char c)
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{
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return std::isalnum(c) or c == '_';
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}
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String parse_filename(const String& filename)
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{
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if (filename.length() > 2 and filename[0] == '~' and filename[1] == '/')
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return parse_filename("$HOME/" + filename.substr(2));
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size_t pos = 0;
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String result;
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for (size_t i = 0; i < filename.length(); ++i)
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{
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if (filename[i] == '$' and (i == 0 or filename[i-1] != '\\'))
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{
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result += filename.substr(pos, i - pos);
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size_t end = i+1;
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while (end != filename.length() and isidentifier(filename[end]))
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++end;
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String var_name = filename.substr(i+1, end - i - 1);
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const char* var_value = getenv(var_name.c_str());
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if (var_value)
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result += var_value;
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pos = end;
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}
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}
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if (pos != filename.length())
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result += filename.substr(pos);
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return result;
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}
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String read_file(const String& filename)
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{
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int fd = open(filename.c_str(), O_RDONLY);
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if (fd == -1)
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{
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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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}
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String content;
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char buf[256];
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while (true)
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{
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ssize_t size = read(fd, buf, 256);
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if (size == -1 or size == 0)
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break;
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content += String(buf, buf + size);
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}
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close(fd);
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return content;
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}
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Buffer* create_buffer_from_file(const String& filename)
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{
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String content = read_file(filename);
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if (Buffer* buffer = BufferManager::instance().get_buffer(filename))
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delete buffer;
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return new Buffer(filename, Buffer::Type::File, content);
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}
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void write_buffer_to_file(const Buffer& buffer, const String& filename)
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{
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int fd = open(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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for (size_t i = 0; i < buffer.line_count(); ++i)
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{
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const String& content = buffer.line_content(i);
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memoryview<char> data = content.data();
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const char* ptr = data.pointer();
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ssize_t count = data.size();
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while (count)
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{
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ssize_t written = write(fd, ptr, count);
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ptr += written;
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count -= written;
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if (written == -1)
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throw file_access_error(filename, strerror(errno));
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}
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}
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close(fd);
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}
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}
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