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putty-source/unix/gtkapp.c
Simon Tatham 3214563d8e Convert a lot of 'int' variables to 'bool'. 
My normal habit these days, in new code, is to treat int and bool as
_almost_ completely separate types. I'm still willing to use C's
implicit test for zero on an integer (e.g. 'if (!blob.len)' is fine,
no need to spell it out as blob.len != 0), but generally, if a
variable is going to be conceptually a boolean, I like to declare it
bool and assign to it using 'true' or 'false' rather than 0 or 1.

PuTTY is an exception, because it predates the C99 bool, and I've
stuck to its existing coding style even when adding new code to it.
But it's been annoying me more and more, so now that I've decided C99
bool is an acceptable thing to require from our toolchain in the first
place, here's a quite thorough trawl through the source doing
'boolification'. Many variables and function parameters are now typed
as bool rather than int; many assignments of 0 or 1 to those variables
are now spelled 'true' or 'false'.

I managed this thorough conversion with the help of a custom clang
plugin that I wrote to trawl the AST and apply heuristics to point out
where things might want changing. So I've even managed to do a decent
job on parts of the code I haven't looked at in years!

To make the plugin's work easier, I pushed platform front ends
generally in the direction of using standard 'bool' in preference to
platform-specific boolean types like Windows BOOL or GTK's gboolean;
I've left the platform booleans in places they _have_ to be for the
platform APIs to work right, but variables only used by my own code
have been converted wherever I found them.

In a few places there are int values that look very like booleans in
_most_ of the places they're used, but have a rarely-used third value,
or a distinction between different nonzero values that most users
don't care about. In these cases, I've _removed_ uses of 'true' and
'false' for the return values, to emphasise that there's something
more subtle going on than a simple boolean answer:
 - the 'multisel' field in dialog.h's list box structure, for which
   the GTK front end in particular recognises a difference between 1
   and 2 but nearly everything else treats as boolean
 - the 'urgent' parameter to plug_receive, where 1 vs 2 tells you
   something about the specific location of the urgent pointer, but
   most clients only care about 0 vs 'something nonzero'
 - the return value of wc_match, where -1 indicates a syntax error in
   the wildcard.
 - the return values from SSH-1 RSA-key loading functions, which use
   -1 for 'wrong passphrase' and 0 for all other failures (so any
   caller which already knows it's not loading an _encrypted private_
   key can treat them as boolean)
 - term->esc_query, and the 'query' parameter in toggle_mode in
   terminal.c, which _usually_ hold 0 for ESC[123h or 1 for ESC[?123h,
   but can also hold -1 for some other intervening character that we
   don't support.

In a few places there's an integer that I haven't turned into a bool
even though it really _can_ only take values 0 or 1 (and, as above,
tried to make the call sites consistent in not calling those values
true and false), on the grounds that I thought it would make it more
confusing to imply that the 0 value was in some sense 'negative' or
bad and the 1 positive or good:
 - the return value of plug_accepting uses the POSIXish convention of
   0=success and nonzero=error; I think if I made it bool then I'd
   also want to reverse its sense, and that's a job for a separate
   piece of work.
 - the 'screen' parameter to lineptr() in terminal.c, where 0 and 1
   represent the default and alternate screens. There's no obvious
   reason why one of those should be considered 'true' or 'positive'
   or 'success' - they're just indices - so I've left it as int.

ssh_scp_recv had particularly confusing semantics for its previous int
return value: its call sites used '<= 0' to check for error, but it
never actually returned a negative number, just 0 or 1. Now the
function and its call sites agree that it's a bool.

In a couple of places I've renamed variables called 'ret', because I
don't like that name any more - it's unclear whether it means the
return value (in preparation) for the _containing_ function or the
return value received from a subroutine call, and occasionally I've
accidentally used the same variable for both and introduced a bug. So
where one of those got in my way, I've renamed it to 'toret' or 'retd'
(the latter short for 'returned') in line with my usual modern
practice, but I haven't done a thorough job of finding all of them.

Finally, one amusing side effect of doing this is that I've had to
separate quite a few chained assignments. It used to be perfectly fine
to write 'a = b = c = TRUE' when a,b,c were int and TRUE was just a
the 'true' defined by stdbool.h, that idiom provokes a warning from
gcc: 'suggest parentheses around assignment used as truth value'!
2018-11-03 13:45:00 +00:00

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/*
* gtkapp.c: a top-level front end to GUI PuTTY and pterm, using
* GtkApplication. Suitable for OS X. Currently unfinished.
*
* (You could run it on ordinary Linux GTK too, in principle, but I
* don't think it would be particularly useful to do so, even once
* it's fully working.)
*/
/*
To build on OS X, you will need a build environment with GTK 3 and
gtk-mac-bundler, and also Halibut on the path (to build the man pages,
without which the standard Makefile will complain). Then, from a clean
checkout, do this:
./mkfiles.pl -U --with-quartz
make -C icons icns
make -C doc
make
and you should get unix/PuTTY.app and unix/PTerm.app as output.
*/
/*
TODO list for a sensible GTK3 PuTTY/pterm on OS X:
Still to do on the application menu bar: items that have to vary with
context or user action (saved sessions and mid-session special
commands), and disabling/enabling the main actions in parallel with
their counterparts in the Ctrl-rightclick context menu.
Mouse wheel events and trackpad scrolling gestures don't work quite
right in the terminal drawing area. This seems to be a combination of
two things, neither of which I completely understand yet. Firstly, on
OS X GTK my trackpad seems to generate GDK scroll events for which
gdk_event_get_scroll_deltas returns integers rather than integer
multiples of 1/30, so we end up scrolling by very large amounts;
secondly, the window doesn't seem to receive a GTK "draw" event until
after the entire scroll gesture is complete, which means we don't get
constant visual feedback on how much we're scrolling by.
There doesn't seem to be a resize handle on terminal windows. Then
again, they do seem to _be_ resizable; the handle just isn't shown.
Perhaps that's a feature (certainly in a scrollbarless configuration
the handle gets in the way of the bottom right character cell in the
terminal itself), but it would be nice to at least understand _why_ it
happens and perhaps include an option to put it back again.
A slight oddity with menus that pop up directly under the mouse
pointer: mousing over the menu items doesn't highlight them initially,
but if I mouse off the menu and back on (without un-popping-it-up)
then suddenly that does work. I don't know if this is something I can
fix, though; it might very well be a quirk of the underlying GTK.
Does OS X have a standard system of online help that I could tie into?
Need to work out what if anything we can do with Pageant on OS X.
Perhaps it's too much bother and we should just talk to the
system-provided SSH agent? Or perhaps not.
Nice-to-have: a custom right-click menu from the application's dock
tile, listing the saved sessions for quick launch. As far as I know
there's nothing built in to GtkApplication that can produce this, but
it's possible we might be able to drop a piece of native Cocoa code in
under ifdef, substituting an application delegate of our own which
forwards all methods we're not interested in to the GTK-provided one?
At the point where this becomes polished enough to publish pre-built,
I suppose I'll have to look into OS X code signing.
https://wiki.gnome.org/Projects/GTK%2B/OSX/Bundling has some links.
*/
#include <assert.h>
#include <stdlib.h>
#include <unistd.h>
#include <gtk/gtk.h>
#define MAY_REFER_TO_GTK_IN_HEADERS
#include "putty.h"
#include "gtkmisc.h"
char *x_get_default(const char *key) { return NULL; }
const bool buildinfo_gtk_relevant = true;
#if !GTK_CHECK_VERSION(3,0,0)
/* This front end only works in GTK 3. If that's not what we've got,
* it's easier to just turn this program into a trivial stub by ifdef
* in the source than it is to remove it in the makefile edifice. */
int main(int argc, char **argv)
{
fprintf(stderr, "GtkApplication frontend doesn't work pre-GTK3\n");
return 1;
}
GtkWidget *make_gtk_toplevel_window(GtkFrontend *frontend) { return NULL; }
void launch_duplicate_session(Conf *conf) {}
void launch_new_session(void) {}
void launch_saved_session(const char *str) {}
void session_window_closed(void) {}
void window_setup_error(const char *errmsg) {}
#else /* GTK_CHECK_VERSION(3,0,0) */
extern const bool use_event_log;
static void startup(GApplication *app, gpointer user_data)
{
GMenu *menubar, *menu, *section;
menubar = g_menu_new();
menu = g_menu_new();
g_menu_append_submenu(menubar, "File", G_MENU_MODEL(menu));
section = g_menu_new();
g_menu_append_section(menu, NULL, G_MENU_MODEL(section));
g_menu_append(section, "New Window", "app.newwin");
menu = g_menu_new();
g_menu_append_submenu(menubar, "Edit", G_MENU_MODEL(menu));
section = g_menu_new();
g_menu_append_section(menu, NULL, G_MENU_MODEL(section));
g_menu_append(section, "Copy", "win.copy");
g_menu_append(section, "Paste", "win.paste");
g_menu_append(section, "Copy All", "win.copyall");
menu = g_menu_new();
g_menu_append_submenu(menubar, "Window", G_MENU_MODEL(menu));
section = g_menu_new();
g_menu_append_section(menu, NULL, G_MENU_MODEL(section));
g_menu_append(section, "Restart Session", "win.restart");
g_menu_append(section, "Duplicate Session", "win.duplicate");
section = g_menu_new();
g_menu_append_section(menu, NULL, G_MENU_MODEL(section));
g_menu_append(section, "Change Settings", "win.changesettings");
if (use_event_log) {
section = g_menu_new();
g_menu_append_section(menu, NULL, G_MENU_MODEL(section));
g_menu_append(section, "Event Log", "win.eventlog");
}
section = g_menu_new();
g_menu_append_section(menu, NULL, G_MENU_MODEL(section));
g_menu_append(section, "Clear Scrollback", "win.clearscrollback");
g_menu_append(section, "Reset Terminal", "win.resetterm");
#if GTK_CHECK_VERSION(3,12,0)
#define SET_ACCEL(app, command, accel) do \
{ \
static const char *const accels[] = { accel, NULL }; \
gtk_application_set_accels_for_action( \
GTK_APPLICATION(app), command, accels); \
} while (0)
#else
/* The Gtk function used above was new in 3.12; the one below
* was deprecated from 3.14. */
#define SET_ACCEL(app, command, accel) \
gtk_application_add_accelerator(GTK_APPLICATION(app), accel, \
command, NULL)
#endif
SET_ACCEL(app, "app.newwin", "<Primary>n");
SET_ACCEL(app, "win.copy", "<Primary>c");
SET_ACCEL(app, "win.paste", "<Primary>v");
#undef SET_ACCEL
gtk_application_set_menubar(GTK_APPLICATION(app),
G_MENU_MODEL(menubar));
}
#define WIN_ACTION_LIST(X) \
X("copy", MA_COPY) \
X("paste", MA_PASTE) \
X("copyall", MA_COPY_ALL) \
X("duplicate", MA_DUPLICATE_SESSION) \
X("restart", MA_RESTART_SESSION) \
X("changesettings", MA_CHANGE_SETTINGS) \
X("clearscrollback", MA_CLEAR_SCROLLBACK) \
X("resetterm", MA_RESET_TERMINAL) \
X("eventlog", MA_EVENT_LOG) \
/* end of list */
#define WIN_ACTION_CALLBACK(name, id) \
static void win_action_cb_ ## id(GSimpleAction *a, GVariant *p, gpointer d) \
{ app_menu_action(d, id); }
WIN_ACTION_LIST(WIN_ACTION_CALLBACK)
#undef WIN_ACTION_CALLBACK
static const GActionEntry win_actions[] = {
#define WIN_ACTION_ENTRY(name, id) { name, win_action_cb_ ## id },
WIN_ACTION_LIST(WIN_ACTION_ENTRY)
#undef WIN_ACTION_ENTRY
};
static GtkApplication *app;
GtkWidget *make_gtk_toplevel_window(GtkFrontend *frontend)
{
GtkWidget *win = gtk_application_window_new(app);
g_action_map_add_action_entries(G_ACTION_MAP(win),
win_actions,
G_N_ELEMENTS(win_actions),
frontend);
return win;
}
void launch_duplicate_session(Conf *conf)
{
extern const bool dup_check_launchable;
assert(!dup_check_launchable || conf_launchable(conf));
g_application_hold(G_APPLICATION(app));
new_session_window(conf_copy(conf), NULL);
}
void session_window_closed(void)
{
g_application_release(G_APPLICATION(app));
}
static void post_initial_config_box(void *vctx, int result)
{
Conf *conf = (Conf *)vctx;
if (result > 0) {
new_session_window(conf, NULL);
} else if (result == 0) {
conf_free(conf);
g_application_release(G_APPLICATION(app));
}
}
void launch_saved_session(const char *str)
{
Conf *conf = conf_new();
do_defaults(str, conf);
g_application_hold(G_APPLICATION(app));
if (!conf_launchable(conf)) {
initial_config_box(conf, post_initial_config_box, conf);
} else {
new_session_window(conf, NULL);
}
}
void launch_new_session(void)
{
/* Same as launch_saved_session except that we pass NULL to
* do_defaults. */
launch_saved_session(NULL);
}
void new_app_win(GtkApplication *app)
{
launch_new_session();
}
static void window_setup_error_callback(void *vctx, int result)
{
g_application_release(G_APPLICATION(app));
}
void window_setup_error(const char *errmsg)
{
create_message_box(NULL, "Error creating session window", errmsg,
string_width("Some sort of fiddly error message that "
"might be technical"),
true, &buttons_ok, window_setup_error_callback, NULL);
}
static void activate(GApplication *app,
gpointer user_data)
{
new_app_win(GTK_APPLICATION(app));
}
static void newwin_cb(GSimpleAction *action,
GVariant *parameter,
gpointer user_data)
{
new_app_win(GTK_APPLICATION(user_data));
}
static void quit_cb(GSimpleAction *action,
GVariant *parameter,
gpointer user_data)
{
g_application_quit(G_APPLICATION(user_data));
}
static void about_cb(GSimpleAction *action,
GVariant *parameter,
gpointer user_data)
{
about_box(NULL);
}
static const GActionEntry app_actions[] = {
{ "newwin", newwin_cb },
{ "about", about_cb },
{ "quit", quit_cb },
};
int main(int argc, char **argv)
{
int status;
{
/* Call the function in ux{putty,pterm}.c to do app-type
* specific setup */
extern void setup(bool);
setup(false); /* false means we are not a one-session process */
}
if (argc > 1) {
extern char *pty_osx_envrestore_prefix;
pty_osx_envrestore_prefix = argv[--argc];
}
{
const char *home = getenv("HOME");
if (home) {
if (chdir(home)) {}
}
}
gtkcomm_setup();
app = gtk_application_new("org.tartarus.projects.putty.macputty",
G_APPLICATION_FLAGS_NONE);
g_signal_connect(app, "activate", G_CALLBACK(activate), NULL);
g_signal_connect(app, "startup", G_CALLBACK(startup), NULL);
g_action_map_add_action_entries(G_ACTION_MAP(app),
app_actions,
G_N_ELEMENTS(app_actions),
app);
status = g_application_run(G_APPLICATION(app), argc, argv);
g_object_unref(app);
return status;
}
#endif /* GTK_CHECK_VERSION(3,0,0) */
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