4coder/4coder_helper.h

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C
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/*
* Bind helper struct and functions
*/
struct Bind_Helper{
Binding_Unit *cursor, *start, *end;
Binding_Unit *header, *group;
int write_total;
int error;
};
#define BH_ERR_NONE 0
#define BH_ERR_MISSING_END 1
#define BH_ERR_MISSING_BEGIN 2
#define BH_ERR_OUT_OF_MEMORY 3
inline void
copy(char *dest, const char *src, int len){
for (int i = 0; i < len; ++i){
*dest++ = *src++;
}
}
inline Binding_Unit*
write_unit(Bind_Helper *helper, Binding_Unit unit){
Binding_Unit *p = 0;
helper->write_total += sizeof(*p);
if (helper->error == 0 && helper->cursor != helper->end){
p = helper->cursor++;
*p = unit;
}
return p;
}
inline char*
write_inline_string(Bind_Helper *helper, char *value, int len){
char *dest = 0;
helper->write_total += len;
if (helper->error == 0){
dest = (char*)helper->cursor;
int cursor_advance = len + sizeof(*helper->cursor) - 1;
cursor_advance /= sizeof(*helper->cursor);
cursor_advance *= sizeof(*helper->cursor);
helper->cursor += cursor_advance;
if (helper->cursor < helper->end){
copy(dest, value, len);
}
else{
helper->error = BH_ERR_OUT_OF_MEMORY;
}
}
return dest;
}
inline Bind_Helper
begin_bind_helper(void *data, int size){
Bind_Helper result;
result.header = 0;
result.group = 0;
result.write_total = 0;
result.error = 0;
result.cursor = (Binding_Unit*)data;
result.start = result.cursor;
result.end = result.start + size / sizeof(*result.cursor);
Binding_Unit unit;
unit.type = unit_header;
unit.header.total_size = sizeof(*result.header);
result.header = write_unit(&result, unit);
result.header->header.user_map_count = 0;
return result;
}
inline void
begin_map(Bind_Helper *helper, int mapid){
if (helper->group != 0 && helper->error == 0) helper->error = BH_ERR_MISSING_END;
if (!helper->error && mapid < mapid_global) ++helper->header->header.user_map_count;
Binding_Unit unit;
unit.type = unit_map_begin;
unit.map_begin.mapid = mapid;
helper->group = write_unit(helper, unit);
helper->group->map_begin.bind_count = 0;
}
inline void
end_map(Bind_Helper *helper){
if (helper->group == 0 && helper->error == 0) helper->error = BH_ERR_MISSING_BEGIN;
helper->group = 0;
}
inline void
bind(Bind_Helper *helper, short code, unsigned char modifiers, int cmdid){
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if (helper->group == 0 && helper->error == 0) helper->error = BH_ERR_MISSING_BEGIN;
if (!helper->error) ++helper->group->map_begin.bind_count;
Binding_Unit unit;
unit.type = unit_binding;
unit.binding.command_id = cmdid;
unit.binding.code = code;
unit.binding.modifiers = modifiers;
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write_unit(helper, unit);
}
inline void
bind(Bind_Helper *helper, short code, unsigned char modifiers, Custom_Command_Function *func){
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if (helper->group == 0 && helper->error == 0) helper->error = BH_ERR_MISSING_BEGIN;
if (!helper->error) ++helper->group->map_begin.bind_count;
Binding_Unit unit;
unit.type = unit_callback;
unit.callback.func = func;
unit.callback.code = code;
unit.callback.modifiers = modifiers;
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write_unit(helper, unit);
}
inline void
bind_vanilla_keys(Bind_Helper *helper, int cmdid){
bind(helper, 0, 0, cmdid);
}
inline void
bind_vanilla_keys(Bind_Helper *helper, Custom_Command_Function *func){
bind(helper, 0, 0, func);
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}
inline void
bind_vanilla_keys(Bind_Helper *helper, unsigned char modifiers, int cmdid){
bind(helper, 0, modifiers, cmdid);
}
inline void
bind_vanilla_keys(Bind_Helper *helper, unsigned char modifiers, Custom_Command_Function *func){
bind(helper, 0, modifiers, func);
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}
inline void
inherit_map(Bind_Helper *helper, int mapid){
if (helper->group == 0 && helper->error == 0) helper->error = BH_ERR_MISSING_BEGIN;
if (!helper->error && mapid < mapid_global) ++helper->header->header.user_map_count;
Binding_Unit unit;
unit.type = unit_inherit;
unit.map_inherit.mapid = mapid;
write_unit(helper, unit);
}
inline void
set_hook(Bind_Helper *helper, int hook_id, Custom_Command_Function *func){
Binding_Unit unit;
unit.type = unit_hook;
unit.hook.hook_id = hook_id;
unit.hook.func = func;
write_unit(helper, unit);
}
inline void
end_bind_helper(Bind_Helper *helper){
if (helper->header){
helper->header->header.total_size = (int)(helper->cursor - helper->start);
helper->header->header.error = helper->error;
}
}
// NOTE(allen): Useful functions and overloads on app links
inline void
push_parameter(Application_Links *app, int param, int value){
app->push_parameter(app, dynamic_int(param), dynamic_int(value));
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}
inline void
push_parameter(Application_Links *app, int param, const char *value, int value_len){
char *value_copy = app->push_memory(app, value_len+1);
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copy(value_copy, value, value_len);
value_copy[value_len] = 0;
app->push_parameter(app, dynamic_int(param), dynamic_string(value_copy, value_len));
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}
inline void
push_parameter(Application_Links *app, const char *param, int param_len, int value){
char *param_copy = app->push_memory(app, param_len+1);
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copy(param_copy, param, param_len);
param_copy[param_len] = 0;
app->push_parameter(app, dynamic_string(param_copy, param_len), dynamic_int(value));
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}
inline void
push_parameter(Application_Links *app, const char *param, int param_len, const char *value, int value_len){
char *param_copy = app->push_memory(app, param_len+1);
char *value_copy = app->push_memory(app, value_len+1);
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copy(param_copy, param, param_len);
copy(value_copy, value, value_len);
value_copy[value_len] = 0;
param_copy[param_len] = 0;
app->push_parameter(app, dynamic_string(param_copy, param_len), dynamic_string(value_copy, value_len));
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}
inline String
push_directory(Application_Links *app){
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String result;
result.memory_size = 512;
result.str = app->push_memory(app, result.memory_size);
result.size = app->directory_get_hot(app, result.str, result.memory_size);
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return(result);
}
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inline Range
get_range(File_View_Summary *view){
Range range;
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range = make_range(view->cursor.pos, view->mark.pos);
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return(range);
}
inline void
exec_command(Application_Links *app, Command_ID id){
app->exec_command_keep_stack(app, id);
app->clear_parameters(app);
}
inline void
exec_command(Application_Links *app, Custom_Command_Function *func){
func(app);
app->clear_parameters(app);
}
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inline void
active_view_to_line(Application_Links *app, int line_number){
File_View_Summary view;
view = app->get_active_file_view(app);
// NOTE(allen|a3.4.4): We don't have to worry about whether this is a valid line number.
// When the position specified isn't possible for whatever reason it will set the cursor to
// a nearby valid position.
app->view_set_cursor(app, &view, seek_line_char(line_number, 0), 1);
}
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inline int
key_is_unmodified(Key_Event_Data *key){
char *mods = key->modifiers;
int unmodified = !mods[MDFR_CONTROL_INDEX] && !mods[MDFR_ALT_INDEX];
return(unmodified);
}
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static int
query_user_general(Application_Links *app, String prompt, String *string, int force_number){
User_Input in;
Query_Bar bar;
int success = 1;
int good_character = 0;
// NOTE(allen|a3.4.4): It will not cause an *error* if we continue on after failing to.
// start a query bar, but it will be unusual behavior from the point of view of the
// user, if this command starts intercepting input even though no prompt is shown.
// This will only happen if you have a lot of bars open already or if the current view
// doesn't support query bars.
if (app->start_query_bar(app, &bar, 0) == 0) return 0;
// NOTE(allen|a3.4.4): The application side is storing a pointer straight to your Query_Bar
// any change you make to it will be reflected in what the application renders. The application
// also makes sure that it destroys all query bars whenever a command exits.
bar.prompt = prompt;
bar.string = *string;
while (1){
// NOTE(allen|a3.4.4): This call will block until the user does one of the input
// types specified in the flags. The first set of flags are inputs you'd like to intercept
// that you don't want to abort on. The second set are inputs that you'd like to cause
// the command to abort. If an event satisfies both flags, it is treated as an abort.
in = app->get_user_input(app, EventOnAnyKey, EventOnEsc | EventOnButton);
// NOTE(allen|a3.4.4): The responsible thing to do on abort is to end the command
// without waiting on get_user_input again.
if (in.abort){
success = 0;
break;
}
good_character = 0;
if (key_is_unmodified(&in.key)){
if (force_number){
if (in.key.character >= '0' && in.key.character <= '9'){
good_character = 1;
}
}
else{
if (in.key.character != 0){
good_character = 1;
}
}
}
// NOTE(allen|a3.4.4): All we have to do to update what is shown on the query bar
// is to edit or local Query_Bar struct! This is handy because it means our Query_Bar
// can double as storing the state of the input AND as the source for the UI.
if (in.type == UserInputKey){
if (in.key.keycode == '\n' || in.key.keycode == '\t'){
break;
}
else if (in.key.keycode == key_back){
--bar.string.size;
}
else if (good_character){
append(&bar.string, in.key.character);
}
}
}
// NOTE(allen|a3.4.4): It is not always necessary to end your query bars, because
// 4coder will clean them up when the command exits anyway, but because this is
// a local scope we should clean up the bar manually because the pointer the application
// stores to our Query_Bar is about to go bad.
app->end_query_bar(app, &bar, 0);
if (success){
*string = bar.string;
}
return(success);
}
inline int
query_user_string(Application_Links *app, String prompt, String *string){
int success = query_user_general(app, prompt, string, 0);
return(success);
}
inline int
query_user_number(Application_Links *app, String prompt, String *string){
int success = query_user_general(app, prompt, string, 1);
return(success);
}