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Second cleanup of multiline editing patch. Add code comments, use better variable names, etc..

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darcs-hash:20061001212243-ac50b-6cd5abfcf6b7013fd23b27734ca29af27d945ca3.gz
This commit is contained in:
axel 2006-10-02 07:22:43 +10:00
parent add1fa9208
commit 44ff9956b9
2 changed files with 171 additions and 75 deletions
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171
screen.c
View File

@ -1,3 +1,11 @@
/** \file screen.c High level library for handling the terminal screen
The screen library allows the interactive reader to write its
output to screen efficiently by keeping an inetrnal representation
of the current screen contents and trying to find the most
efficient way for transforming that to the desired screen content.
*/
#include "config.h"
#include <stdlib.h>
@ -43,6 +51,11 @@
#include "highlight.h"
#include "screen.h"
/**
Ugly kludge. The internal buffer used to store output of
tputs. Since tputs external function can only take an integer and
not a pointer as parameter we need a static storage buffer.
*/
static buffer_t *s_writeb_buffer=0;
/**
@ -186,22 +199,23 @@ static int calc_prompt_width( wchar_t *prompt )
return res;
}
/**
Free all memory used by one line_t struct.
*/
static void free_line( void *l )
{
line_t *line = (line_t *)l;
// debug( 0, L"Free line at %d", l);
al_destroy( &line->text );
al_destroy( &line->color );
free( line );
}
/**
Clear the specified array of line_t structs.
*/
static void s_reset_arr( array_list_t *l )
{
// debug( 0, L"I have %d lines", al_get_count( l ));
al_foreach( l, &free_line );
al_truncate( l, 0 );
}
@ -209,18 +223,21 @@ static void s_reset_arr( array_list_t *l )
void s_init( screen_t *s )
{
memset( s, 0, sizeof(screen_t));
sb_init( &s->prompt_buff );
sb_init( &s->actual_prompt );
}
void s_destroy( screen_t *s )
{
s_reset_arr( &s->screen );
al_destroy( &s->screen );
s_reset_arr( &s->output );
al_destroy( &s->output );
s_reset_arr( &s->actual );
al_destroy( &s->actual );
s_reset_arr( &s->desired );
al_destroy( &s->desired );
}
/**
Allocate a new line_t struct.
*/
static line_t *s_create_line()
{
line_t *current = malloc( sizeof( line_t ));
@ -229,12 +246,17 @@ static line_t *s_create_line()
return current;
}
/*
Appends a character to the end of the line that the output cursor is on
/**
Appends a character to the end of the line that the output cursor is
on. This function automatically handles linebreaks and lines longer
than the screen width.
*/
static void s_output_append_char( screen_t *s, wchar_t b, int c, int prompt_width )
static void s_desired_append_char( screen_t *s,
wchar_t b,
int c,
int prompt_width )
{
int line_no = s->output_cursor[1];
int line_no = s->desired_cursor[1];
switch( b )
{
@ -242,12 +264,12 @@ static void s_output_append_char( screen_t *s, wchar_t b, int c, int prompt_widt
{
int i;
line_t *current = s_create_line();
al_push( &s->output, current );
s->output_cursor[1]++;
s->output_cursor[0]=0;
al_push( &s->desired, current );
s->desired_cursor[1]++;
s->desired_cursor[0]=0;
for( i=0; i < prompt_width; i++ )
{
s_output_append_char( s, L' ', 0, prompt_width );
s_desired_append_char( s, L' ', 0, prompt_width );
}
break;
}
@ -255,10 +277,10 @@ static void s_output_append_char( screen_t *s, wchar_t b, int c, int prompt_widt
case L'\r':
{
line_t *current;
current = (line_t *)al_get( &s->output, line_no );
current = (line_t *)al_get( &s->desired, line_no );
al_truncate( &current->text, 0 );
al_truncate( &current->color, 0 );
s->output_cursor[0]=0;
s->desired_cursor[0]=0;
break;
}
@ -270,46 +292,55 @@ static void s_output_append_char( screen_t *s, wchar_t b, int c, int prompt_widt
int ew = wcwidth( ellipsis_char );
int i;
current = (line_t *)al_get( &s->output, line_no );
current = (line_t *)al_get( &s->desired, line_no );
if( !current )
{
current = s_create_line();
al_push( &s->output, current );
al_push( &s->desired, current );
}
if( s->output_cursor[0] + cw + ew > screen_width )
/*
Check if we are at the end of the line. If so, print an
ellipsis character and continue on the next line.
*/
if( s->desired_cursor[0] + cw + ew > screen_width )
{
al_push_long( &current->text, ellipsis_char );
al_push_long( &current->color, 0 );
current = s_create_line();
al_push( &s->output, current );
s->output_cursor[1]++;
s->output_cursor[0]=0;
al_push( &s->desired, current );
s->desired_cursor[1]++;
s->desired_cursor[0]=0;
for( i=0; i < (prompt_width-ew); i++ )
{
s_output_append_char( s, L' ', 0, prompt_width );
s_desired_append_char( s, L' ', 0, prompt_width );
}
s_output_append_char( s, ellipsis_char, 0, prompt_width );
s_desired_append_char( s, ellipsis_char, 0, prompt_width );
}
al_push_long( &current->text, b );
al_push_long( &current->color, c );
s->output_cursor[0]+= cw;
s->desired_cursor[0]+= cw;
break;
}
}
}
/**
The writeb function offered to tputs.
*/
static int s_writeb( char c )
{
b_append( s_writeb_buffer, &c, 1 );
return 0;
}
/**
Move screen cursor to the specified position.
*/
static void s_move( screen_t *s, buffer_t *b, int new_x, int new_y )
{
int i;
@ -326,7 +357,7 @@ static void s_move( screen_t *s, buffer_t *b, int new_x, int new_y )
output_set_writer( &s_writeb );
s_writeb_buffer = b;
y_steps = new_y - s->screen_cursor[1];
y_steps = new_y - s->actual_cursor[1];
if( y_steps > 0 && (strcmp( cursor_down, "\n")==0))
{
@ -336,7 +367,7 @@ static void s_move( screen_t *s, buffer_t *b, int new_x, int new_y )
course move the cursor to the beginning of the line as
well. The cursor_up does not have this behaviour...
*/
s->screen_cursor[0]=0;
s->actual_cursor[0]=0;
}
if( y_steps < 0 )
@ -355,14 +386,13 @@ static void s_move( screen_t *s, buffer_t *b, int new_x, int new_y )
}
x_steps = new_x - s->screen_cursor[0];
x_steps = new_x - s->actual_cursor[0];
if( x_steps && new_x == 0 )
{
char c = '\r';
b_append( b, &c, 1 );
x_steps = 0;
// debug( 0, L"return to first" );
}
if( x_steps < 0 ){
@ -379,13 +409,16 @@ static void s_move( screen_t *s, buffer_t *b, int new_x, int new_y )
}
s->screen_cursor[0] = new_x;
s->screen_cursor[1] = new_y;
s->actual_cursor[0] = new_x;
s->actual_cursor[1] = new_y;
output_set_writer( writer_old );
}
/**
Set the pen color for the terminal
*/
static void s_set_color( screen_t *s, buffer_t *b, int c )
{
@ -401,19 +434,26 @@ static void s_set_color( screen_t *s, buffer_t *b, int c )
}
/**
Convert a wide character to a multibyte string and append it to the
buffer.
*/
static void s_write_char( screen_t *s, buffer_t *b, wchar_t c )
{
int (*writer_old)(char) = output_get_writer();
output_set_writer( &s_writeb );
s_writeb_buffer = b;
s->screen_cursor[0]+=wcwidth( c );
s->actual_cursor[0]+=wcwidth( c );
writech( c );
output_set_writer( writer_old );
}
/**
Send the specified string through tputs and append the output to
the specified buffer.
*/
static void s_write_mbs( buffer_t *b, char *s )
{
int (*writer_old)(char) = output_get_writer();
@ -426,7 +466,10 @@ static void s_write_mbs( buffer_t *b, char *s )
output_set_writer( writer_old );
}
/**
Convert a wide string to a multibyte string and append it to the
buffer.
*/
static void s_write_str( buffer_t *b, wchar_t *s )
{
int (*writer_old)(char) = output_get_writer();
@ -439,7 +482,9 @@ static void s_write_str( buffer_t *b, wchar_t *s )
output_set_writer( writer_old );
}
/**
Update the screen to match the desired output.
*/
static void s_update( screen_t *scr, wchar_t *prompt )
{
int i, j;
@ -448,25 +493,24 @@ static void s_update( screen_t *scr, wchar_t *prompt )
buffer_t output;
b_init( &output );
if( wcscmp( prompt, (wchar_t *)scr->prompt_buff.buff ) )
if( wcscmp( prompt, (wchar_t *)scr->actual_prompt.buff ) )
{
s_move( scr, &output, 0, 0 );
s_write_str( &output, prompt );
sb_clear( &scr->prompt_buff );
sb_append( &scr->prompt_buff, prompt );
// debug( 0, L"YAY %d", prompt_width );
scr->screen_cursor[0] = prompt_width;
sb_clear( &scr->actual_prompt );
sb_append( &scr->actual_prompt, prompt );
scr->actual_cursor[0] = prompt_width;
}
for( i=0; i< al_get_count( &scr->output ); i++ )
for( i=0; i< al_get_count( &scr->desired ); i++ )
{
line_t *o_line = (line_t *)al_get( &scr->output, i );
line_t *s_line = (line_t *)al_get( &scr->screen, i );
line_t *o_line = (line_t *)al_get( &scr->desired, i );
line_t *s_line = (line_t *)al_get( &scr->actual, i );
if( !s_line )
{
s_line = s_create_line();
al_push( &scr->screen, s_line );
al_push( &scr->actual, s_line );
}
for( j=(i==0?prompt_width:0); j<al_get_count( &o_line->text ); j++ )
{
@ -494,25 +538,24 @@ static void s_update( screen_t *scr, wchar_t *prompt )
}
}
}
// debug( 0, L"frum frum %d %d", al_get_count( &o_line->text ), al_get_count( &s_line->text ) );
if( al_get_count( &s_line->text ) > al_get_count( &o_line->text ) )
{
s_move( scr, &output, al_get_count( &o_line->text ), i );
s_write_mbs( &output, clr_eol);
al_truncate( &s_line->text, al_get_count( &o_line->text ) );
// debug( 0, L"YAY DELETE from %d", al_get_count( &o_line->text ) );
}
}
for( i=al_get_count( &scr->output ); i< al_get_count( &scr->screen ); i++ )
for( i=al_get_count( &scr->desired ); i< al_get_count( &scr->actual ); i++ )
{
line_t *s_line = (line_t *)al_get( &scr->screen, i );
line_t *s_line = (line_t *)al_get( &scr->actual, i );
s_move( scr, &output, 0, i );
s_write_mbs( &output, clr_eol);
al_truncate( &s_line->text, 0 );
}
s_move( scr, &output, scr->output_cursor[0], scr->output_cursor[1] );
s_move( scr, &output, scr->desired_cursor[0], scr->desired_cursor[1] );
s_set_color( scr, &output, 0xffffffff);
@ -555,12 +598,12 @@ void s_write( screen_t *s,
return;
}
s_reset_arr( &s->output );
s->output_cursor[0] = s->output_cursor[1] = 0;
s_reset_arr( &s->desired );
s->desired_cursor[0] = s->desired_cursor[1] = 0;
for( i=0; i<prompt_width; i++ )
{
s_output_append_char( s, L' ', 0, prompt_width );
s_desired_append_char( s, L' ', 0, prompt_width );
}
for( i=0; b[i]; i++ )
@ -569,27 +612,27 @@ void s_write( screen_t *s,
if( i == cursor )
{
memcpy(cursor_arr, s->output_cursor, sizeof(int)*2);
memcpy(cursor_arr, s->desired_cursor, sizeof(int)*2);
col = 0;
}
s_output_append_char( s, b[i], col, prompt_width );
s_desired_append_char( s, b[i], col, prompt_width );
}
if( i == cursor )
{
memcpy(cursor_arr, s->output_cursor, sizeof(int)*2);
memcpy(cursor_arr, s->desired_cursor, sizeof(int)*2);
}
memcpy( s->output_cursor, cursor_arr, sizeof(int)*2 );
memcpy( s->desired_cursor, cursor_arr, sizeof(int)*2 );
s_update( s, prompt );
}
void s_reset( screen_t *s )
{
s_reset_arr( &s->screen );
s->screen_cursor[0] = s->screen_cursor[1] = 0;
sb_clear( &s->prompt_buff );
s_reset_arr( &s->actual );
s->actual_cursor[0] = s->actual_cursor[1] = 0;
sb_clear( &s->actual_prompt );
}

75
screen.h
View File

@ -1,34 +1,87 @@
/** \file screen.h High level library for handling the terminal screen
The screen library allows the interactive reader to write its
output to screen efficiently by keeping an inetrnal representation
of the current screen contents and trying to find the most
efficient way for transforming that to the desired screen content.
*/
#ifndef FISH_SCREEN_H
#define FISH_SCREEN_H
#define SCREEN_REPAINT 1
#define SCREEN_SKIP_RETURN 2
/**
The struct representing the current and desired screen contents.
*/
typedef struct
{
array_list_t output;
array_list_t screen;
int output_cursor[2];
int screen_cursor[2];
string_buffer_t prompt_buff;
/*
The internal representation of the desired screen contents.
*/
array_list_t desired;
/**
The internal representation of the actual screen contents.
*/
array_list_t actual;
/**
The desired cursor position.
*/
int desired_cursor[2];
/**
The actual cursor position.
*/
int actual_cursor[2];
/**
A stringbuffer containing the prompt which was last printed to
the screen.
*/
string_buffer_t actual_prompt;
}
screen_t;
/**
A struct representing a single line of a screen. Consists of two
array_lists, which must always be of the same length.
*/
typedef struct
{
/**
The text contents of the line
*/
array_list_t text;
/**
Highlight information for the line
*/
array_list_t color;
}
line_t;
/**
Initialize a new screen struct
*/
void s_init( screen_t *s );
/**
Free all memory used by the specified screen struct
*/
void s_destroy( screen_t *s );
/**
This is the main function for the screen putput library. It is used
to define the desired contents of the screen. The screen command
will use it's knowlege of the current contents of the screen in
order to render the desired output using as few terminal commands
as possible.
*/
void s_write( screen_t *s,
wchar_t *prompt,
wchar_t *b,
int *c,
int cursor );
wchar_t *commandline,
int *colors,
int cursor_pos );
/**
This function resets the screen buffers internal knowledge about
the contents of the screen. Use this function when some other
function than s_write has written to the screen.
*/
void s_reset( screen_t *s );
#endif