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Repeat last search

nephewtom
#21302
Hi.
Is it possible to repeat last search?
Let's say I hit ctrl f and type a string, for example Interactive.
Then quit and do some other stuff.

Is there a way to hit some key and repeat the same search for Interactive?
Or may be hit ctrl f and other key, and repeat the search for it.

Best Regards.
Edited by nephewtom on Reason: Initial post
Simon Anciaux
#21308
EDIT: actually there is a way: start a search and pres CTRL + Return or CTRL + Tab to search the last term.

By default you can't do that. It possible to implement yourself in the custom layer if you have the paid version.
Edited by Simon Anciaux on Reason: Correction
nephewtom
#21309
I have it. Any hints?
Recently got 4coder and just have changed some key bindings to match Emacs (C-n, C-p, C-a, C-e, C-k ...)

Regards.
Simon Anciaux
#21310
The search functions are implemented in 4coder_base_commands.cpp. The "search", "reverse_search", "search_identifier", "reverse_search_identifier" functions call "isearch" and "isearch__update_highlight" to do the actual search. So you could copy the search_xx and reverse_search_xx function and modify them to search for the last search term.

Here are my search functions. I don't guarantee that they will work or that they have the same behavior as 4coder or other editor. It's intended to be somewhat similar to VIM search. It uses global variables, I never took the time to use the managed scopes to re-implement them.

The history part is a "module" that I re-use in other places of my custom layer.
You need to bind:
- "search_query" to start a search by typing a search term and go to the first instance forward;
- "search_query_identifier" to start a search with the word under the cursor and go to the first instance forward;
- "search_next" to go to the next instance of the search term;
- "search_previous" to go to the previous instance of the search term;
- "search_return_to_start" to go back to where you started the search;
- "search_clear" to clear the search term and remove the highlight in the file (if you use the second code sample);

When the end of the file is reached, the search will continue from the top of the file.
When you use search_query you can use UP and DOWN arrow to find previous term you searched (it may behave weird).
If you switch buffer you can use search_next and search_previous to search the term in the new buffer.
search_return_to_start will only go back in the last buffer you searched. 

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// MARK history

typedef struct History {
    
    char* buffer;
    int bufferSize;
    int maxEntryCount;
    int entryMaxLength;
    int lastWrittenEntry;
    int lastReadEntry;
    int entryCount;
} History;

History history_init( void* buffer, int bufferSize, int entryMaxLength ) {
    
    History h = { };
    
    h.buffer = ( char* ) buffer;
    h.bufferSize = bufferSize;
    h.entryMaxLength = entryMaxLength;
    h.maxEntryCount = bufferSize / entryMaxLength;
    h.lastWrittenEntry = -1;
    h.lastReadEntry = -1;
    h.entryCount = 0;
    
    return h;
}

int history_push( History* history, char* string, int length, int entry = -1 ) {
    
    if ( entry >= 0 && entry < history->entryCount ) {
        
        history->lastWrittenEntry = entry;
        
    } else {
        
        if ( history->entryCount < history->maxEntryCount - 1 ) {
            history->entryCount++;
        }
        
        if ( history->lastWrittenEntry < history->entryCount - 1 ) {
            history->lastWrittenEntry++;
        } else {
            history->lastWrittenEntry = 0;
        }
    }
    
    char* destination = history->buffer + ( history->entryMaxLength * history->lastWrittenEntry );
    length = ( length > history->entryMaxLength - 1 ) ? history->entryMaxLength - 1 : length;
    
    for ( int c = 0; c < length; c++ ) {
        *destination++ = *string++;
    }
    
    *destination = '\0';
    
    history->lastReadEntry = history->lastWrittenEntry;
    
    return history->lastWrittenEntry;
}

void history_pop( History* history ) {
    
    if ( history->entryCount > 0 ) {
        
        for ( int i = history->lastWrittenEntry; i < history->entryCount - 1; i++ ) {
            
            char* destination = history->buffer + ( history->entryMaxLength * i );
            char* source = destination + history->entryMaxLength;
            
            while ( *source != '\0' ) {
                *destination++ = *source++;
            }
            
            ( *destination ) = '\0';
        }
        
        history->entryCount--;
        history->lastWrittenEntry--;
        
        if ( history->lastWrittenEntry < 0 ) {
            history->lastWrittenEntry = history->entryCount - 1;
        }
    }
}

int history_getLast( History* history, char* string, int* length ) {
    
    *length = 0;
    
    if ( history->entryCount > 0 ) {
        
        history->lastReadEntry = history->lastWrittenEntry;
        char* source = history->buffer + ( history->entryMaxLength * history->lastReadEntry );
        
        while ( *source != '\0' ) {
            *string++ = *source++;
            ( *length )++;
        }
    }
    
    return history->lastReadEntry;
}

int history_getOlder( History* history, char* string, int* length ) {
    
    *length = 0;
    
    if ( history->entryCount > 0 ) {
        
        history->lastReadEntry--;
        
        if ( history->lastReadEntry < 0 ) {
            history->lastReadEntry = history->entryCount - 1;
        }
        
        char* source = history->buffer + ( history->entryMaxLength * history->lastReadEntry );
        
        while ( *source != '\0' ) {
            *string++ = *source++;
            ( *length )++;
        }
    }
    
    return history->lastReadEntry;
}

int history_getNewer( History* history, char* string, int* length ) {
    
    *length = 0;
    
    if ( history->entryCount > 0 ) {
        
        history->lastReadEntry++;
        
        if ( history->lastReadEntry >= history->entryCount ) {
            history->lastReadEntry = 0;
        }
        
        char* source = history->buffer + ( history->entryMaxLength * history->lastReadEntry );
        
        while ( *source != '\0' ) {
            *string++ = *source++;
            ( *length )++;
        }
    }
    
    return history->lastReadEntry;
}

// MARK search

#define MAX_SEARCH_LENGTH 256
static char searchBuffer[ 10 ][ MAX_SEARCH_LENGTH ] = { };
History searchHistory = history_init( searchBuffer, sizeof( searchBuffer ), MAX_SEARCH_LENGTH );

int32_t search_buffer_id = 0;
int32_t search_start_position = 0;
int32_t search_last_position = 0;
char search_query_space[ MAX_SEARCH_LENGTH ];
int32_t search_query_size;

static void search_query_( Application_Links* app, String query ) {
    
    View_Summary view = get_active_view( app, AccessProtected );
    Buffer_Summary buffer = get_buffer( app, view.buffer_id, AccessProtected );
    
    if ( buffer.exists ) {
        
        search_buffer_id = buffer.buffer_id;
        Query_Bar bar = { 0 };
        
        if ( start_query_bar( app, &bar, 0 ) != 0 ) {
            
            int32_t start_pos = view.cursor.pos;
            search_start_position = start_pos;
            Range match = make_range( start_pos, start_pos );
            
            if ( query.size > 0 ) {
                match.max += query.size;
            }
            
            bar.string = make_fixed_width_string( search_query_space );
            copy_ss( &bar.string, query );
            bar.prompt = make_lit_string( "Search: " );
            int32_t entry = -1;
            
            Managed_Scope view_scope = view_get_managed_scope( app, view.view_id );
            Managed_Object highlight = alloc_buffer_markers_on_buffer( app, buffer.buffer_id, 2, &view_scope );
            Marker_Visual visual = create_marker_visual( app, highlight );
            marker_visual_set_effect( app, visual,
                                     VisualType_CharacterHighlightRanges,
                                     SymbolicColorFromPalette( Stag_Highlight ),
                                     SymbolicColorFromPalette( Stag_At_Highlight ), 0 );
            marker_visual_set_view_key( app, visual, view.view_id );
            isearch__update_highlight( app, &view, highlight, match.start, match.end );
            
            User_Input in = { 0 };
            
            for ( ; ; ) {
                
                b32 suppress_highligh_update = false;
                
                if ( match.min != match.max ) {
                    center_view( app );
                }
                
                in = get_user_input( app, EventOnAnyKey, EventOnEsc );
                
                if ( in.abort ) {
                    break;
                }
                
                uint8_t character[ 4 ];
                uint32_t length = to_writable_character( in, character );
                
                if ( in.key.keycode == '\n' ) {
                    
                    break;
                    
                } else if ( length != 0 && key_is_unmodified( &in.key ) ) {
                    
                    append_ss( &bar.string, make_string( character, length ) );
                    
                } else if ( in.key.keycode == key_back ) {
                    
                    backspace_utf8( &bar.string );
                    
                } else if ( in.key.keycode == key_up ) {
                    
                    int32_t savedEntry = entry;
                    entry = history_getOlder( &searchHistory, bar.string.str, &bar.string.size );
                    
                    if ( savedEntry == entry ) {
                        entry = -1;
                        bar.string.size = 0;
                    }
                    
                } else if ( in.key.keycode == key_down ) {
                    
                    int32_t savedEntry = entry;
                    entry = history_getNewer( &searchHistory, bar.string.str, &bar.string.size );
                    
                    if ( savedEntry == entry ) {
                        entry = -1;
                        bar.string.size = 0;
                    }
                }
                
                search_query_size = bar.string.size;
                
                if ( in.command.command == mouse_wheel_scroll ) {
                    mouse_wheel_scroll( app );
                    suppress_highligh_update = true;
                }
                
                int32_t new_pos = 0;
                buffer_seek_string_insensitive_forward( app, &buffer, start_pos, 0, bar.string.str, bar.string.size, &new_pos );
                
                if ( new_pos >= buffer.size ) {
                    buffer_seek_string_insensitive_backward( app, &buffer, start_pos, 0, bar.string.str, bar.string.size, &new_pos );
                }
                
                if ( new_pos < buffer.size && new_pos >= 0 ) {
                    match.min = new_pos;
                    match.max = match.min + bar.string.size;
                }
                
                if ( !suppress_highligh_update ){
                    isearch__update_highlight( app, &view, highlight, match.start, match.end );
                }
            }
            
            managed_object_free( app, highlight );
            
            if ( in.abort ) {
                
                view_set_cursor( app, &view, seek_pos( search_start_position ), true );
                center_view( app );
                
            } else {
                
                if ( match.max - match.min > 0 ) {
                    view_set_cursor( app, &view, seek_pos( match.min ), true );
                    search_query_size = bar.string.size;
                    search_last_position = match.min;
                    history_push( &searchHistory, bar.string.str, bar.string.size, -1 );
                }
            }
        }
    }
}

CUSTOM_COMMAND_SIG( search_next ) {
    
    uint32_t access = AccessProtected;
    
    View_Summary view = get_active_view( app, access );
    Buffer_Summary buffer = get_buffer( app, view.buffer_id, access );
    
    if ( buffer.exists ) {
        
        if ( search_buffer_id != buffer.buffer_id ) {
            search_start_position = search_last_position = view.cursor.pos;
            search_buffer_id = buffer.buffer_id;
        }
        
        if ( search_query_size > 0 ) {
            
            int32_t new_pos = 0;
            buffer_seek_string_insensitive_forward( app, &buffer, search_last_position + 1, 0, search_query_space, search_query_size, &new_pos );
            
            if ( new_pos >= buffer.size && search_last_position != 0 ) {
                buffer_seek_string_insensitive_forward( app, &buffer, 0, 0, search_query_space, search_query_size, &new_pos );
            }
            
            if ( new_pos < buffer.size ) {
                
                Range match = { 0 };
                match.min = new_pos;
                match.max = match.min + search_query_size;
                search_last_position = match.min;
                
                view_set_cursor( app, &view, seek_pos( match.min ), true );
                center_view( app );
            }
        }
    }
}

CUSTOM_COMMAND_SIG( search_previous ) {
    
    uint32_t access = AccessProtected;
    
    View_Summary view = get_active_view( app, access );
    Buffer_Summary buffer = get_buffer( app, view.buffer_id, access );
    
    if ( buffer.exists ) {
        
        if ( search_buffer_id != buffer.buffer_id ) {
            search_start_position = search_last_position = view.cursor.pos;
            search_buffer_id = buffer.buffer_id;
        }
        
        if ( search_query_size > 0 ) {
            
            int32_t new_pos = 0;
            buffer_seek_string_insensitive_backward( app, &buffer, search_last_position - 1, 0, search_query_space, search_query_size, &new_pos );
            
            if ( new_pos < 0 && search_last_position != buffer.size ) {
                buffer_seek_string_insensitive_backward( app, &buffer, buffer.size - 1, 0, search_query_space, search_query_size, &new_pos );
            }
            
            if ( new_pos >= 0 ) {
                
                Range match = { 0 };
                match.min = new_pos;
                match.max = match.min + search_query_size;
                search_last_position = match.min;
                
                view_set_cursor( app, &view, seek_pos( match.min ), true );
                center_view( app );
            }
        }
    }
}

CUSTOM_COMMAND_SIG( search_query ) {
    String query = { 0 };
    search_query_( app, query );
}

CUSTOM_COMMAND_SIG( search_query_identifier ) {
    
    View_Summary view = get_active_view( app, AccessProtected );
    Buffer_Summary buffer = get_buffer( app, view.buffer_id, AccessProtected );
    
    if ( buffer.exists ) {
        
        Range range = { 0 };
        String query = read_identifier_at_pos( app, &buffer, view.cursor.pos, search_query_space, MAX_SEARCH_LENGTH, &range );
        view_set_cursor( app, &view, seek_pos( range.min ), true );
        
        search_buffer_id = buffer.buffer_id;
        search_start_position = range.min;
        search_last_position = range.min;
        search_query_size = query.size;
        history_push( &searchHistory, query.str, query.size, -1 );
        search_next( app );
    }
}

CUSTOM_COMMAND_SIG( search_return_to_start ) {
    
    View_Summary view = get_active_view( app, AccessProtected );
    Buffer_Summary buffer = get_buffer( app, view.buffer_id, AccessProtected );
    
    if ( buffer.exists && search_buffer_id == buffer.buffer_id ) {
        view_set_cursor( app, &view, seek_pos( search_start_position ), true );
        center_view( app );
    }
}

CUSTOM_COMMAND_SIG( search_clear ) {
    search_query_size = 0;
}


And if you want search highlight you need to copy the following code at the end of the render_caller (create a copy of default_render_caller from 4coder_default_hooks.cpp), just before "do_core_render(app);". 

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// NOTE simon: highlight search
    if ( search_query_size ) {
        
        Theme_Color color;
        color.tag = Stag_Text_Cycle_3;
        get_theme_colors(app, &color, 1);
        
        Temp_Memory temp = begin_temp_memory(scratch);
        int32_t text_size = on_screen_range.one_past_last - on_screen_range.first;
        char *text = push_array(scratch, char, text_size);
        buffer_read_range(app, &buffer, on_screen_range.first, on_screen_range.one_past_last, text);
        
        Highlight_Record *records = push_array(scratch, Highlight_Record, 0);
        String tail = make_string(text, text_size);
        for (int32_t i = 0; i < text_size; tail.str += 1, tail.size -= 1, i += 1){
            if (match_part_insensitive(tail, make_string( search_query_space, search_query_size ))){
                Highlight_Record *record = push_array(scratch, Highlight_Record, 1);
                record->first = i + on_screen_range.first;
                record->one_past_last = record->first + search_query_size;
                record->color = color.color;
                tail.str += search_query_size - 1;
                tail.size -= search_query_size - 1;
                i += search_query_size - 1;
            }
        }
        int32_t record_count = (int32_t)(push_array(scratch, Highlight_Record, 0) - records);
        push_array(scratch, Highlight_Record, 1);
        
        if (record_count > 0){
            sort_highlight_record(records, 0, record_count);
            Temp_Memory marker_temp = begin_temp_memory(scratch);
            Marker *markers = push_array(scratch, Marker, 0);
            int_color current_color = records[0].color;
            {
                Marker *marker = push_array(scratch, Marker, 2);
                marker[0].pos = records[0].first;
                marker[1].pos = records[0].one_past_last;
            }
            for (int32_t i = 1; i <= record_count; i += 1){
                bool32 do_emit = i == record_count || (records[i].color != current_color);
                if (do_emit){
                    int32_t marker_count = (int32_t)(push_array(scratch, Marker, 0) - markers);
                    Managed_Object o = alloc_buffer_markers_on_buffer(app, buffer.buffer_id, marker_count, &render_scope);
                    managed_object_store_data(app, o, 0, marker_count, markers);
                    Marker_Visual v = create_marker_visual(app, o);
                    marker_visual_set_effect(app, v,
                                             VisualType_CharacterHighlightRanges,
                                             SymbolicColor_Transparent, current_color, 0);
                    marker_visual_set_priority(app, v, VisualPriority_Lowest);
                    end_temp_memory(marker_temp);
                    current_color = records[i].color;
                }
                
                Marker *marker = push_array(scratch, Marker, 2);
                marker[0].pos = records[i].first;
                marker[1].pos = records[i].one_past_last;
            }
        }
        
        end_temp_memory(temp);
    }
Edited by Simon Anciaux on Reason: wording
John
#21311
@nephewtom, Simon(mrmixer) knows 4coder inside-out, so his answer is the best one could ask!

I've made my own naive but simple modification to the isearch function in 4coder_base_commands.cpp, which seems to work but I don't know its implications. I replaced the line: 
1
copy(&bar.string, query_init);

with 
1
copy(&bar.string, previous_isearch_query);


And speaking of modifications to 4coder's search, I'd love to know if someone has managed to allow pasting from clipboard to the search prompt.
Simon Anciaux
#21317
I just look at the recent version of the code and there is a way by default to search for the last term.

Just start a search and press CTRL + Return or CTRL + TAB.

Sorry for saying it wasn't possible.
nephewtom
#21332
mrmixer
I just look at the recent version of the code and there is a way by default to search for the last term.

Just start a search and press CTRL + Return or CTRL + TAB.

Sorry for saying it wasn't possible.


Yes, that made it.
Anyway, thanks for the explanations about the code.

Regards.
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