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Add documentation, fix memory leaks and do minor code tweaks in fish_pager

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darcs-hash:20061022110414-ac50b-e5ba776e795e0273d819d4eb51d5f60fba967db2.gz
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axel 2006-10-22 21:04:14 +10:00
parent 5a7a8003a0
commit e2dca4273a
1 changed files with 125 additions and 39 deletions
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164
fish_pager.c
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@ -74,6 +74,24 @@ enum
}
;
enum
{
/*
Returnd by the pager if no more displaying is needed
*/
PAGER_DONE,
/*
Returned by the pager if the completions would not fit in the specified number of columns
*/
PAGER_RETRY,
/*
Returned by the pager if the terminal changes size
*/
PAGER_RESIZE
}
;
/**
This struct should be continually updated by signals as the term
resizes, and as such always contain the correct current size.
@ -81,11 +99,23 @@ enum
static struct winsize termsize;
/**
The termios modes the terminal had when the program started. These
should be restored on exit
*/
static struct termios saved_modes;
static struct termios pager_modes;
/**
This flag is set to 1 of we have sent the enter_ca_mode terminfo
sequence to save the previous terminal contents.
*/
static int is_ca_mode = 0;
/**
This buffer_t is used to buffer the output of the pager to improve
screen redraw performance bu cutting down the number of write()
calls to only one.
*/
static buffer_t *pager_buffer;
/**
@ -101,7 +131,13 @@ static wchar_t *hightlight_var[] =
}
;
/**
This string_buffer_t contains the text that should be sent back to the calling program
*/
static string_buffer_t out_buff;
/**
This is the file to which the output text should be sent. It is really a pipe.
*/
static FILE *out_file;
/**
@ -136,6 +172,10 @@ typedef struct
}
comp_t;
/**
This function translates from a highlight code to a specific color
by check invironement variables
*/
static int get_color( int highlight )
{
wchar_t *val;
@ -160,6 +200,12 @@ static int get_color( int highlight )
return output_color_code( val );
}
/**
This function calculates the minimum width for each completion
entry in the specified array_list. This width depends on the
terminal size, so this function should be called when the terminal
changes size.
*/
static void recalc_width( array_list_t *l, const wchar_t *prefix )
{
int i;
@ -173,6 +219,10 @@ static void recalc_width( array_list_t *l, const wchar_t *prefix )
}
/**
Test if the specified character sequence has been entered on the
keyboard
*/
static int try_sequence( char *seq )
{
int j, k;
@ -196,6 +246,9 @@ static int try_sequence( char *seq )
return 0;
}
/**
Read a character from keyboard
*/
static wint_t readch()
{
struct mapping
@ -255,13 +308,18 @@ static wint_t readch()
return input_common_readch(0);
}
/**
Write specified character to the output buffer \c pager_buffer
*/
static int pager_buffered_writer( char c)
{
b_append( pager_buffer, &c, 1 );
return 0;
}
/**
Flush \c pager_buffer to stdout
*/
static void pager_flush()
{
write( 1, pager_buffer->buff, pager_buffer->used );
@ -424,7 +482,7 @@ static void completion_print( int cols,
\param is_quoted whether the completions should be quoted
\param l the list of completions
\return zero if the specified number of columns do not fit, no-zero otherwise
\return one of PAGER_RETRY, PAGER_DONE and PAGER_RESIZE
*/
static int completion_try_print( int cols,
@ -455,13 +513,13 @@ static int completion_try_print( int cols,
int pref_tot_width=0;
int min_tot_width = 0;
int res=0;
int res=PAGER_RETRY;
/*
Skip completions on tiny terminals
*/
if( termsize.ws_col < 16 )
return 1;
return PAGER_DONE;
memset( pref_width, 0, sizeof(pref_width) );
memset( min_width, 0, sizeof(min_width) );
@ -550,7 +608,7 @@ static int completion_try_print( int cols,
if( print )
{
res=1;
res=PAGER_DONE;
if( rows < termsize.ws_row )
{
/* List fits on screen. Print it and leave */
@ -585,11 +643,10 @@ static int completion_try_print( int cols,
while(do_loop)
{
wchar_t msg[30];
int percent = 100*(pos+rows)/(2*rows-termsize.ws_row+1);
set_color( FISH_COLOR_BLACK,
get_color(HIGHLIGHT_PAGER_PROGRESS) );
swprintf( msg, 30,
L" %d to %d of %d \r",
_(L" %d to %d of %d \r"),
pos, pos+termsize.ws_row-1, rows );
writestr(msg);
set_color( FISH_COLOR_NORMAL, FISH_COLOR_NORMAL );
@ -689,7 +746,7 @@ static int completion_try_print( int cols,
case R_NULL:
{
do_loop=0;
res=2;
res=PAGER_RESIZE;
break;
}
@ -887,6 +944,10 @@ static int interrupt_handler()
static void init()
{
struct sigaction act;
static struct termios pager_modes;
program_name = L"fish_pager";
wsetlocale( LC_ALL, L"" );
@ -903,21 +964,21 @@ static void init()
{
if( dup2( 2, 1 ) == -1 )
{
debug( 0, L"Could not set up output file descriptors for pager" );
debug( 0, _(L"Could not set up output file descriptors for pager") );
exit( 1 );
}
if( dup2( in, 0 ) == -1 )
{
debug( 0, L"Could not set up input file descriptors for pager %d", in );
debug( 0, _(L"Could not set up input file descriptors for pager %d"), in );
exit( 1 );
}
}
else
{
debug( 0, L"Could not open tty for pager" );
{
debug( 0, _(L"Could not open tty for pager") );
exit( 1 );
}
}
out_file = fdopen( out, "w" );
/**
@ -925,7 +986,6 @@ static void init()
*/
sb_init( &out_buff );
halloc_util_init();
env_universal_init( 0, 0, 0, 0);
input_common_init( &interrupt_handler );
output_set_writer( &pager_buffered_writer );
@ -966,7 +1026,7 @@ static void init()
if( setupterm( 0, STDOUT_FILENO, 0) == ERR )
{
debug( 0, L"Could not set up terminal" );
debug( 0, _(L"Could not set up terminal") );
exit(1);
}
@ -977,6 +1037,7 @@ void destroy()
env_universal_destroy();
input_common_destroy();
halloc_util_destroy();
wutil_destroy();
if( del_curterm( cur_term ) == ERR )
{
debug( 0, _(L"Error while closing terminfo") );
@ -986,43 +1047,54 @@ void destroy()
fclose( out_file );
}
#define BUFSIZE 1024
void read_array( FILE* file, array_list_t *comp )
{
char buffer[BUFSIZE];
buffer_t buffer;
int c;
int i;
char cc;
wchar_t *wcs, *unescaped;
b_init( &buffer );
while( !feof( file ) )
{
i = 0;
while( i < BUFSIZE-1 )
buffer.used=0;
while( 1 )
{
c = getc( file );
if( c == EOF )
{
return;
break;
}
if( c == '\n' )
{
break;
}
cc=c;
buffer[ i++ ] = c;
b_append( &buffer, &cc, 1 );
}
buffer[ i ] = '\0';
wcs = str2wcs( buffer );
if( wcs )
if( buffer.used )
{
unescaped = unescape( wcs, 0 );
al_push( comp, unescaped );
free( wcs );
cc=0;
b_append( &buffer, &cc, 1 );
wcs = str2wcs( buffer.buff );
if( wcs )
{
unescaped = unescape( wcs, 0 );
al_push( comp, unescaped );
free( wcs );
}
}
}
b_destroy( &buffer );
}
int main( int argc, char **argv )
@ -1032,12 +1104,19 @@ int main( int argc, char **argv )
array_list_t *comp;
wchar_t *prefix;
/*
This initialization is made early, so that the other init code
can use global_context for memory managment
*/
halloc_util_init();
if( argc < 3 )
{
debug( 0, L"Insufficient arguments" );
debug( 0, _(L"Insufficient arguments") );
}
else
{
comp = al_halloc( global_context );
prefix = str2wcs( argv[2] );
is_quoted = strcmp( "1", argv[1] )==0;
@ -1061,28 +1140,35 @@ int main( int argc, char **argv )
read_array( stdin, comp );
}
init();
mangle_descriptions( comp );
if( wcscmp( prefix, L"-" ) == 0 )
join_completions( comp );
join_completions( comp );
mangle_completions( comp, prefix );
for( i = 6; i>0; i-- )
{
switch( completion_try_print( i, prefix, is_quoted, comp ) )
{
case 0:
case PAGER_RETRY:
break;
case 1:
case PAGER_DONE:
i=0;
break;
case 2:
case PAGER_RESIZE:
/*
This means we got a resize event, so we start over from the beginning
*/
i=7;
break;
}
}
}
free(prefix );