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Implement a readonly mode

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This commit introduces the `readonly` variable as well as the `-ro`
command line option which prevent buffers from being overwritten on
disk when the `write` command is used without arguments. Some buffers
can selectively be put in readonly mode by setting the `readonly`
variable on the `buffer` scope, the `global` mode will affect all
buffers (even those who will be open subsequently), using the `window`
scope will have no effect.

Closes #685
This commit is contained in:
Frank LENORMAND 2016-07-20 20:45:50 +03:00
parent 88a9607552
commit 8a4596bea9
5 changed files with 36 additions and 12 deletions
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7
src/buffer.cc
View File

@ -591,6 +591,13 @@ void Buffer::set_fs_timestamp(timespec ts)
void Buffer::on_option_changed(const Option& option)
{
if (option.name() == "readonly")
{
if (option.get<bool>())
m_flags |= Flags::ReadOnly;
else
m_flags &= ~Flags::ReadOnly;
}
run_hook_in_own_context("BufSetOption",
format("{}={}", option.name(), option.get_as_string()));
}

13
src/buffer.hh
View File

@ -101,12 +101,13 @@ class Buffer : public SafeCountable, public OptionManagerWatcher, public Scope
public:
enum class Flags
{
None = 0,
File = 1 << 0,
New = 1 << 1,
Fifo = 1 << 2,
NoUndo = 1 << 3,
Debug = 1 << 4
None = 0,
File = 1 << 0,
New = 1 << 1,
Fifo = 1 << 2,
NoUndo = 1 << 3,
Debug = 1 << 4,
ReadOnly = 1 << 5,
};
Buffer(String name, Flags flags, StringView data = {},

3
src/buffer_manager.cc
View File

@ -78,7 +78,8 @@ void BufferManager::backup_modified_buffers()
{
for (auto& buf : m_buffers)
{
if ((buf->flags() & Buffer::Flags::File) and buf->is_modified())
if ((buf->flags() & Buffer::Flags::File) and buf->is_modified()
and !(buf->flags() & Buffer::Flags::ReadOnly))
write_buffer_to_backup_file(*buf);
}
}

9
src/commands.cc
View File

@ -239,6 +239,12 @@ void write_buffer(const ParametersParser& parser, Context& context, const ShellC
if (parser.positional_count() == 0 and !(buffer.flags() & Buffer::Flags::File))
throw runtime_error("cannot write a non file buffer without a filename");
// if the buffer is in read-only mode and we try to save it directly
// or we try to write to it indirectly using e.g. a symlink, throw an error
if ((context.buffer().flags() & Buffer::Flags::ReadOnly)
&& (parser.positional_count() == 0 || real_path(parser[0]) == buffer.name()))
throw runtime_error("cannot overwrite the buffer when in readonly mode");
auto filename = parser.positional_count() == 0 ?
buffer.name() : parse_filename(parser[0]);
write_buffer_to_file(buffer, filename);
@ -260,7 +266,8 @@ void write_all_buffers()
{
for (auto& buffer : BufferManager::instance())
{
if ((buffer->flags() & Buffer::Flags::File) and buffer->is_modified())
if ((buffer->flags() & Buffer::Flags::File) and buffer->is_modified()
and !(buffer->flags() & Buffer::Flags::ReadOnly))
write_buffer_to_file(*buffer, buffer->name());
}
}

16
src/main.cc
View File

@ -265,6 +265,7 @@ void register_options()
reg.declare_option("modelinefmt", "format string used to generate the modeline",
"%val{bufname} %val{cursor_line}:%val{cursor_char_column} "_str);
reg.declare_option("debug", "various debug flags", DebugFlags::None);
reg.declare_option("readonly", "prevent buffers from being modified", false);
}
struct convert_to_client_mode
@ -460,7 +461,7 @@ int run_client(StringView session, StringView init_command, UIType ui_type)
}
int run_server(StringView session, StringView init_command,
bool ignore_kakrc, bool daemon, UIType ui_type,
bool ignore_kakrc, bool daemon, bool readonly, UIType ui_type,
ConstArrayView<StringView> files, ByteCoord target_coord)
{
static bool terminate = false;
@ -503,6 +504,8 @@ int run_server(StringView session, StringView init_command,
write_to_debug_buffer("*** This is the debug buffer, where debug info will be written ***");
GlobalScope::instance().options().get_local_option("readonly").set(readonly);
Server server(session.empty() ? to_string(getpid()) : session.str());
bool startup_error = false;
@ -536,7 +539,9 @@ int run_server(StringView session, StringView init_command,
{
try
{
open_or_create_file_buffer(file);
Buffer *buffer = open_or_create_file_buffer(file);
if (readonly)
buffer->flags() |= Buffer::Flags::ReadOnly;
}
catch (Kakoune::runtime_error& error)
{
@ -741,7 +746,8 @@ int main(int argc, char* argv[])
{ "q", { false, "in filter mode, be quiet about errors applying keys" } },
{ "ui", { true, "set the type of user interface to use (ncurses, dummy, or json)" } },
{ "l", { false, "list existing sessions" } },
{ "clear", { false, "clear dead sessions" } } }
{ "clear", { false, "clear dead sessions" } },
{ "ro", { false, "readonly mode" } } }
};
try
{
@ -793,7 +799,8 @@ int main(int argc, char* argv[])
for (size_t i = 0; i < parser.positional_count(); ++i)
files.emplace_back(parser[i]);
return run_filter(*keys, init_command, files, (bool)parser.get_switch("q"));
return run_filter(*keys, init_command, files,
(bool)parser.get_switch("q"));
}
if (auto server_session = parser.get_switch("c"))
@ -840,6 +847,7 @@ int main(int argc, char* argv[])
return run_server(session, init_command,
(bool)parser.get_switch("n"),
(bool)parser.get_switch("d"),
(bool)parser.get_switch("ro"),
ui_type, files, target_coord);
}
catch (convert_to_client_mode& convert)