Make up/down cursor move up or down when in multiline mode, except if already in search mode or at the top/bottom line. Since part of this is done in script-space, this involves adding some functionality to the commandline builtin.

darcs-hash:20070921140549-75c98-ba9e83f5e6fdecae5df8f83dd863794c6af9770c.gz

builtin_commandline.c

@@ -220,6 +220,8 @@ static int builtin_commandline( wchar_t **argv )
 	int tokenize = 0;	
 	
 	int cursor_mode = 0;
+	int line_mode = 0;
+	int search_mode = 0;
 	wchar_t *begin, *end;
 
 	current_buffer = (wchar_t *)builtin_complete_get_temporary_buffer();
@@ -312,6 +314,14 @@ static int builtin_commandline( wchar_t **argv )
 					L"cursor", no_argument, 0, 'C'
 				}
 				,
+				{
+					L"line", no_argument, 0, 'L'
+				}
+				,
+				{
+					L"search-mode", no_argument, 0, 'S'
+				}
+				,
 				{
 					0, 0, 0, 0 
 				}
@@ -322,7 +332,7 @@ static int builtin_commandline( wchar_t **argv )
 		
 		int opt = wgetopt_long( argc,
 								argv, 
-								L"abijpctwforhI:C", 
+								L"abijpctwforhI:CLS", 
 								long_options, 
 								&opt_index );
 		if( opt == -1 )
@@ -391,6 +401,14 @@ static int builtin_commandline( wchar_t **argv )
 				cursor_mode = 1;
 				break;
 				
+			case 'L':
+				line_mode = 1;
+				break;
+				
+			case 'S':
+				search_mode = 1;
+				break;
+				
 			case 'h':
 				builtin_print_help( argv[0], sb_out );
 				return 0;
@@ -408,7 +426,7 @@ static int builtin_commandline( wchar_t **argv )
 		/*
 		  Check for invalid switch combinations
 		*/
-		if( buffer_part || cut_at_cursor || append_mode || tokenize || cursor_mode )
+		if( buffer_part || cut_at_cursor || append_mode || tokenize || cursor_mode || line_mode || search_mode )
 		{
 			sb_printf(sb_err,
 					  BUILTIN_ERR_COMBO,
@@ -457,7 +475,7 @@ static int builtin_commandline( wchar_t **argv )
 	/*
 	  Check for invalid switch combinations
 	*/
-	if( cursor_mode && (argc-woptind > 1) )
+	if( (search_mode || line_mode || cursor_mode) && (argc-woptind > 1) )
 	{
 		
 		sb_append2( sb_err,
@@ -468,7 +486,7 @@ static int builtin_commandline( wchar_t **argv )
 		return 1;
 	}
 
-	if( (buffer_part || tokenize || cut_at_cursor) && cursor_mode )
+	if( (buffer_part || tokenize || cut_at_cursor) && (cursor_mode || line_mode || search_mode) )
 	{		
 		sb_printf( sb_err,
 				   BUILTIN_ERR_COMBO,
@@ -546,6 +564,20 @@ static int builtin_commandline( wchar_t **argv )
 		
 	}
 	
+	if( line_mode )
+	{
+		int pos = reader_get_cursor_pos();
+		wchar_t *buff = reader_get_buffer();
+		sb_printf( sb_out, L"%d\n", parse_util_lineno( buff, pos ) );
+		return 0;
+			
+	}
+	
+	if( search_mode )
+	{
+		return !reader_search_mode();
+	}
+	
 		
 	switch( buffer_part )
 	{

input.c

@@ -134,7 +134,9 @@ static const wchar_t *name_arr[] =
 	L"execute",
 	L"beginning-of-buffer",
 	L"end-of-buffer",
-	L"repaint"
+	L"repaint",
+	L"up-line",
+	L"down-line"
 }
 	;
 
@@ -215,7 +217,9 @@ static const wchar_t code_arr[] =
 	R_EXECUTE,
 	R_BEGINNING_OF_BUFFER,
 	R_END_OF_BUFFER,
-	R_REPAINT
+	R_REPAINT,
+	R_UP_LINE,
+	R_DOWN_LINE
 }
 	;
 
@@ -1242,10 +1246,10 @@ static void add_common_bindings()
 		  terminfo sometimes specifies a different sequence than what
 		  keypresses actually generate
 		*/
-		add_mapping( name[i], L"\x1b[A", L"Up", L"history-search-backward" );
-		add_mapping( name[i], L"\x1b[B", L"Down", L"history-search-forward" );
-		add_terminfo_mapping( name[i], (key_up), L"Up", L"history-search-backward" );
-		add_terminfo_mapping( name[i], (key_down), L"Down", L"history-search-forward" );
+		add_mapping( name[i], L"\x1b[A", L"Up", L"up-or-search" );
+		add_mapping( name[i], L"\x1b[B", L"Down", L"down-or-search" );
+		add_terminfo_mapping( name[i], (key_up), L"Up", L"up-or-search" );
+		add_terminfo_mapping( name[i], (key_down), L"Down", L"down-or-search" );
 
 		add_mapping( name[i], L"\x1b[C", L"Right", L"forward-char" );
 		add_mapping( name[i], L"\x1b[D", L"Left", L"backward-char" );

input.h

@@ -49,7 +49,9 @@ enum
 	R_EXECUTE,
 	R_BEGINNING_OF_BUFFER,
 	R_END_OF_BUFFER,
-	R_REPAINT
+	R_REPAINT,
+	R_UP_LINE,
+	R_DOWN_LINE,
 }
 ;
 

parse_util.c

@@ -135,6 +135,97 @@ int parse_util_lineno( const wchar_t *str, int len )
 	return res;
 }
 
+
+int parse_util_get_line_from_offset( wchar_t *buff, int pos )
+{
+	//	return parse_util_lineno( buff, pos );
+
+	int i;
+	int count = 0;
+	if( pos < 0 )
+	{
+		return -1;
+	}
+	
+	for( i=0; i<pos; i++ )
+	{
+		if( !buff[i] )
+		{
+			return -1;
+		}
+		
+		if( buff[i] == L'\n' )
+		{
+			count++;
+		}
+	}
+	return count;
+}
+
+
+int parse_util_get_offset_from_line( wchar_t *buff, int line )
+{
+	int i;
+	int count = 0;
+	
+	if( line < 0 )
+	{
+		return -1;
+	}
+
+	if( line == 0 )
+		return 0;
+		
+	for( i=0;; i++ )
+	{
+		if( !buff[i] )
+		{
+			return -1;
+		}
+		
+		if( buff[i] == L'\n' )
+		{
+			count++;
+			if( count == line )
+			{
+				return i+1;
+			}
+			
+		}
+	}
+}
+
+int parse_util_get_offset( wchar_t *buff, int line, int line_offset )
+{
+	int off = parse_util_get_offset_from_line( buff, line );
+	int off2 = parse_util_get_offset_from_line( buff, line+1 );
+	int line_offset2 = line_offset;
+	
+	if( off < 0 )
+	{
+		return -1;
+	}
+	
+	if( off2 < 0 )
+	{
+		off2 = wcslen( buff );
+	}
+	
+	if( line_offset2 < 0 )
+	{
+		line_offset2 = 0;
+	}
+	
+	if( line_offset2 >= off2-off-1 )
+	{
+		line_offset2 = off2-off-1;
+	}
+	
+	return off + line_offset2;
+	
+}
+
+
 int parse_util_locate_cmdsubst( const wchar_t *in, 
 								wchar_t **begin, 
 								wchar_t **end,

parse_util.h

@@ -93,6 +93,23 @@ void parse_util_token_extent( const wchar_t *buff,
 */
 int parse_util_lineno( const wchar_t *str, int len );
 
+/**
+   Calculate the line number of the specified cursor position
+ */
+int parse_util_get_line_from_offset( wchar_t *buff, int pos );
+
+/**
+   Get the offset of the first character on the specified line
+ */
+int parse_util_get_offset_from_line( wchar_t *buff, int line );
+
+
+/**
+   Return the total offset of the buffer for the cursor position nearest to the specified poition
+ */
+int parse_util_get_offset( wchar_t *buff, int line, int line_offset );
+
+
 /**
    Autoload the specified file, if it exists in the specified path. Do
    not load it multiple times unless it's timestamp changes or

reader.c

@@ -258,6 +258,12 @@ typedef struct reader_data
 	   Pointer to previous reader_data
 	*/
 	struct reader_data *next;
+
+	/**
+	   This variable keeps state on if we are in search mode, and
+	   if yes, what mode
+	 */
+	int search_mode;
 }
 	reader_data_t;
 
@@ -681,6 +687,7 @@ void repaint()
 	
 }
 
+
 /**
    Remove the previous character in the character buffer and on the
    screen using syntax highlighting, etc.
@@ -2304,11 +2311,11 @@ wchar_t *reader_readline()
 	int comp_empty=1;
 	int finished=0;
 	struct termios old_modes;
-	int search_mode = 0;
 
 	check_size();
 	sb_clear( &data->search_buff );
 	data->buff[data->buff_len]='\0';
+	data->search_mode = NO_SEARCH;
 	
 	s_reset( &data->screen );
 	
@@ -2621,9 +2628,9 @@ wchar_t *reader_readline()
 			/* Escape was pressed */
 			case L'\x1b':
 			{
-				if( search_mode )
+				if( data->search_mode )
 				{
-					search_mode= 0;
+					data->search_mode= NO_SEARCH;
 										
 					if( data->token_history_pos==-1 )
 					{
@@ -2745,23 +2752,23 @@ wchar_t *reader_readline()
 			{
 				int reset = 0;
 				
-				if( search_mode == NO_SEARCH )
+				if( data->search_mode == NO_SEARCH )
 				{
 					reset = 1;
 					if( ( c == R_HISTORY_SEARCH_BACKWARD ) ||
 					    ( c == R_HISTORY_SEARCH_FORWARD ) )
 					{
-						search_mode = LINE_SEARCH;
+						data->search_mode = LINE_SEARCH;
 					}
 					else
 					{
-						search_mode = TOKEN_SEARCH;
+						data->search_mode = TOKEN_SEARCH;
 					}
 					
 					sb_append( &data->search_buff, data->buff );
 				}
 
-				switch( search_mode )
+				switch( data->search_mode )
 				{
 
 					case LINE_SEARCH:
@@ -2874,6 +2881,72 @@ wchar_t *reader_readline()
 				break;
 			}
 
+			case R_UP_LINE:
+			case R_DOWN_LINE:
+			{
+				int line = parse_util_get_line_from_offset( data->buff,
+								 data->buff_pos );
+				int new_line;
+
+				if( c == R_UP_LINE )
+					new_line = line-1;
+				else
+					new_line = line+1;
+	
+				int line_count = parse_util_lineno( data->buff, data->buff_len )-1;
+				
+				if( new_line >= 0 && new_line <= line_count)
+				{
+					int base_pos;
+					
+					int indent_old;
+					int indent_new;
+					int old_line_offset;
+					int new_total_offset;
+
+//					debug( 0, L"Move up one line to %d", new_line );
+					
+					base_pos = parse_util_get_offset_from_line( data->buff, 
+										    new_line );
+/*					debug( 0, L"Old cursor offset is %d, new base offset is %d", 
+					       data->buff_pos, 
+					       base_pos );
+*/
+					
+					if( data->buff_pos ==(data->buff_len) )
+					{
+						if( data->buff_pos == 0 )
+						{
+							indent_old = 0;
+						}
+						else
+						{
+							indent_old = data->indent[data->buff_pos-1];
+						}
+					}
+					else
+					{
+						if( data->buff[data->buff_pos] == L'\n' )
+							indent_old = data->indent[data->buff_pos-1];
+						else
+							indent_old = data->indent[data->buff_pos];
+					}
+					
+					indent_new = data->indent[base_pos];
+										    //				debug( 0, L"Old indent %d, new indent %d", indent_old, indent_new );
+					
+					old_line_offset = data->buff_pos - parse_util_get_offset_from_line( data->buff,
+												 line );
+					new_total_offset = parse_util_get_offset( data->buff, new_line, old_line_offset - 4*(indent_new-indent_old));
+					data->buff_pos = new_total_offset;
+					repaint();
+				}
+				
+				
+				break;
+			}
+			
+
 			/* Other, if a normal character, we add it to the command */
 			default:
 			{
@@ -2900,9 +2973,10 @@ wchar_t *reader_readline()
 		if( (c != R_HISTORY_SEARCH_BACKWARD) &&
 		    (c != R_HISTORY_SEARCH_FORWARD) &&
 		    (c != R_HISTORY_TOKEN_SEARCH_BACKWARD) &&
-			(c != R_HISTORY_TOKEN_SEARCH_FORWARD) )
+		    (c != R_HISTORY_TOKEN_SEARCH_FORWARD) &&
+		    (c != R_NULL) )
 		{
-			search_mode = 0;
+			data->search_mode = NO_SEARCH;
 			sb_clear( &data->search_buff );
 			history_reset();
 			data->token_history_pos=-1;
@@ -2929,6 +3003,17 @@ wchar_t *reader_readline()
 	return finished ? data->buff : 0;
 }
 
+int reader_search_mode()
+{
+	if( !data )
+	{
+		return -1;
+	}
+	
+	return !!data->search_mode;	
+}
+
+
 /**
    Read non-interactively.  Read input from stdin without displaying
    the prompt, using syntax highlighting. This is used for reading

reader.h

@@ -174,4 +174,12 @@ int reader_exit_forced();
 */
 int reader_shell_test( wchar_t *b );
 
+/**
+   Test whether the interactive reader is in search mode.
+
+   \return o if not in search mode, 1 if in search mode and -1 if not in interactive mode
+ */
+int reader_search_mode();
+
+
 #endif

share/functions/down-or-search.fish

@@ -0,0 +1,23 @@
+function down-or-search
+	# If we are already in search mode, continue
+	if commandline --search-mode
+		commandline -f history-search-forward
+		return
+	end
+
+	# We are not in search mode.
+	# If we are on the bottom line, start search mode, 
+	# otherwise move down
+	set lineno (commandline -L)
+	set line_count (commandline|wc -l)
+
+	echo on line $lineno of $line_count >&2
+
+	switch $lineno
+		case $line_count
+		commandline -f history-search-forward
+		
+		case '*'
+		commandline -f down-line
+	end
+end

share/functions/up-or-search.fish

@@ -0,0 +1,17 @@
+function up-or-search
+	# If we are already in search mode, continue
+	if commandline --search-mode
+		commandline -f history-search-backward
+		return
+	end
+
+	set lineno (commandline -L)
+
+	switch $lineno
+		case 1
+		commandline -f history-search-backward
+		
+		case '*'
+		commandline -f up-line
+	end
+end