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fish-shell/highlight.c
axel 2401a163fe Move all fallbacks for standard and not-so-standard unix functions to fallback.c, in order to have a one-stop place to look for such functions 
darcs-hash:20060228131716-ac50b-0832193dbcaf7191dcb24456dc40f2e861a1382e.gz
2006-02-28 23:17:16 +10:00

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/** \file highlight.c
Functions for syntax highlighting
*/
#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <wchar.h>
#include <wctype.h>
#include <termios.h>
#include <signal.h>
#include "config.h"
#include "fallback.h"
#include "util.h"
#include "wutil.h"
#include "highlight.h"
#include "tokenizer.h"
#include "proc.h"
#include "parser.h"
#include "parse_util.h"
#include "builtin.h"
#include "function.h"
#include "env.h"
#include "expand.h"
#include "sanity.h"
#include "common.h"
#include "complete.h"
#include "output.h"
static void highlight_universal_internal( wchar_t * buff,
int *color,
int pos,
array_list_t *error );
/**
The environment variables used to specify the color of different tokens.
*/
static wchar_t *hightlight_var[] =
{
L"fish_color_normal",
L"fish_color_command",
L"fish_color_subshell",
L"fish_color_redirection",
L"fish_color_end",
L"fish_color_error",
L"fish_color_param",
L"fish_color_comment",
L"fish_color_match",
L"fish_color_search_match",
L"fish_color_pager_prefix",
L"fish_color_pager_completion",
L"fish_color_pager_description",
L"fish_color_pager_progress"
}
;
int highlight_get_color( int highlight )
{
if( highlight < 0 )
return FISH_COLOR_NORMAL;
if( highlight >= (12) )
return FISH_COLOR_NORMAL;
wchar_t *val = env_get( hightlight_var[highlight]);
if( val == 0 )
val = env_get( hightlight_var[HIGHLIGHT_NORMAL]);
if( val == 0 )
{
return FISH_COLOR_NORMAL;
}
return output_color_code( val );
}
void highlight_shell( wchar_t * buff,
int *color,
int pos,
array_list_t *error )
{
tokenizer tok;
int had_cmd=0;
int i;
int last_val;
wchar_t *last_cmd=0;
int len = wcslen(buff);
if( !len )
return;
for( i=0; buff[i] != 0; i++ )
color[i] = -1;
for( tok_init( &tok, buff, TOK_SHOW_COMMENTS );
tok_has_next( &tok );
tok_next( &tok ) )
{
int last_type = tok_last_type( &tok );
int prev_argc=0;
switch( last_type )
{
case TOK_STRING:
{
if( had_cmd )
{
/*Parameter */
wchar_t *param = tok_last( &tok );
if( param[0] == L'-' )
{
if( complete_is_valid_option( last_cmd, param, error ))
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_PARAM;
else
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
}
else
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_PARAM;
}
}
else
{
prev_argc=0;
/*
Command. First check that the command actually exists.
*/
wchar_t *cmd = expand_one( 0,
wcsdup(tok_last( &tok )),
EXPAND_SKIP_SUBSHELL | EXPAND_SKIP_VARIABLES);
if( cmd == 0 )
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
}
else
{
wchar_t *tmp;
int is_cmd = 0;
int is_subcommand = 0;
int mark = tok_get_pos( &tok );
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_COMMAND;
if( parser_is_subcommand( cmd ) )
{
tok_next( &tok );
if(( wcscmp( L"-h", tok_last( &tok ) ) == 0 ) ||
( wcscmp( L"--help", tok_last( &tok ) ) == 0 ) )
{
/*
The builtin and command builtins
are normally followed by another
command, but if they are invoked
with the -h option, their help text
is displayed instead
*/
}
else
{
is_subcommand = 1;
}
tok_set_pos( &tok, mark );
}
if( !is_subcommand )
{
/*
OK, this is a command, it has been
successfully expanded and everything
looks ok. Lets check if the command
exists.
*/
is_cmd |= builtin_exists( cmd );
is_cmd |= function_exists( cmd );
is_cmd |= (tmp=get_filename( cmd )) != 0;
/*
Could not find the command. Maybe it is a path for a implicit cd command.
Lets check!
*/
if( !is_cmd )
{
wchar_t *pp = parser_cdpath_get( cmd );
if( pp )
{
free( pp );
is_cmd = 1;
}
}
free(tmp);
if( is_cmd )
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_COMMAND;
}
else
{
if( error )
al_push( error, wcsdupcat2 ( L"Unknown command \'", cmd, L"\'", 0 ));
color[ tok_get_pos( &tok ) ] = (HIGHLIGHT_ERROR);
}
had_cmd = 1;
}
free(cmd);
if( had_cmd )
{
if( last_cmd )
free( last_cmd );
last_cmd = wcsdup( tok_last( &tok ) );
}
}
}
break;
}
case TOK_REDIRECT_OUT:
case TOK_REDIRECT_IN:
case TOK_REDIRECT_APPEND:
case TOK_REDIRECT_FD:
{
if( !had_cmd )
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
if( error )
al_push( error, wcsdup ( L"Redirection without a command" ) );
break;
}
wchar_t *target=0;
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_REDIRECTION;
tok_next( &tok );
/*
Check that we are redirecting into a file
*/
switch( tok_last_type( &tok ) )
{
case TOK_STRING:
{
target = expand_one( 0, wcsdup( tok_last( &tok ) ), EXPAND_SKIP_SUBSHELL);
/*
Redirect filename may contain a subshell.
If so, it will be ignored/not flagged.
*/
}
break;
default:
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
if( error )
al_push( error, wcsdup ( L"Invalid redirection" ) );
}
}
if( target != 0 )
{
wchar_t *dir = wcsdup( target );
wchar_t *dir_end = wcsrchr( dir, L'/' );
struct stat buff;
/*
If file is in directory other than '.', check
that the directory exists.
*/
if( dir_end != 0 )
{
*dir_end = 0;
if( wstat( dir, &buff ) == -1 )
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
if( error )
al_push( error, wcsdupcat2( L"Directory \'", dir, L"\' does not exist", 0 ) );
}
}
free( dir );
/*
If the file is read from or appended to, check
if it exists.
*/
if( last_type == TOK_REDIRECT_IN ||
last_type == TOK_REDIRECT_APPEND )
{
if( wstat( target, &buff ) == -1 )
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
if( error )
al_push( error, wcsdupcat2( L"File \'", target, L"\' does not exist", 0 ) );
}
}
free( target );
}
break;
}
case TOK_PIPE:
case TOK_BACKGROUND:
{
if( had_cmd )
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_END;
had_cmd = 0;
}
else
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
if( error )
al_push( error, wcsdup ( L"No job to put in background" ) );
}
break;
}
case TOK_END:
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_END;
had_cmd = 0;
break;
}
case TOK_COMMENT:
{
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_COMMENT;
break;
}
case TOK_ERROR:
default:
{
/*
If the tokenizer reports an error, highlight it as such.
*/
if( error )
al_push( error, wcsdup ( tok_last( &tok) ) );
color[ tok_get_pos( &tok ) ] = HIGHLIGHT_ERROR;
break;
}
}
}
if( last_cmd )
free( last_cmd );
tok_destroy( &tok );
/*
Locate and syntax highlight subshells recursively
*/
wchar_t *buffcpy = wcsdup( buff );
wchar_t *subpos=buffcpy;
int done=0;
while( 1 )
{
wchar_t *begin, *end;
if( parse_util_locate_cmdsubst( subpos,
(const wchar_t **)&begin,
(const wchar_t **)&end,
1) <= 0)
{
break;
}
if( !*end )
done=1;
else
*end=0;
highlight_shell( begin+1, color +(begin-buffcpy)+1, -1, error );
color[end-buffcpy]=HIGHLIGHT_PARAM;
if( done )
break;
subpos = end+1;
}
free( buffcpy);
last_val=0;
for( i=0; buff[i] != 0; i++ )
{
if( color[i] >= 0 )
last_val = color[i];
else
color[i] = last_val;
}
highlight_universal_internal( buff, color, pos, error );
/*
Spaces should not be highlighted at all, since it makes cursor look funky in some terminals
*/
for( i=0; buff[i]; i++ )
{
if( iswspace(buff[i]) )
{
color[i]=0;
}
}
}
/**
Perform quote and parenthesis highlighting on the specified string.
*/
static void highlight_universal_internal( wchar_t * buff,
int *color,
int pos,
array_list_t *error )
{
if( (pos >= 0) && (pos < wcslen(buff)) )
{
/*
Highlight matching quotes
*/
if( (buff[pos] == L'\'') || (buff[pos] == L'\"') )
{
array_list_t l;
al_init( &l );
int level=0;
wchar_t prev_q=0;
wchar_t *str=buff;
int match_found=0;
while(*str)
{
switch( *str )
{
case L'\\':
str++;
break;
case L'\"':
case L'\'':
if( level == 0 )
{
level++;
al_push( &l, (void *)(str-buff) );
prev_q = *str;
}
else
{
if( prev_q == *str )
{
int pos1, pos2;
level--;
pos1 = (int)al_pop( &l );
pos2 = str-buff;
if( pos1==pos || pos2==pos )
{
color[pos1]|=HIGHLIGHT_MATCH<<8;
color[pos2]|=HIGHLIGHT_MATCH<<8;
match_found = 1;
}
prev_q = *str==L'\"'?L'\'':L'\"';
}
else
{
level++;
al_push( &l, (void *)(str-buff) );
prev_q = *str;
}
}
break;
}
if( (*str == L'\0'))
break;
str++;
}
al_destroy( &l );
if( !match_found )
color[pos] = HIGHLIGHT_ERROR<<8;
}
/*
Highlight matching parenthesis
*/
if( wcschr( L"()[]{}", buff[pos] ) )
{
int step = wcschr(L"({[", buff[pos])?1:-1;
wchar_t dec_char = *(wcschr( L"()[]{}", buff[pos] ) + step);
wchar_t inc_char = buff[pos];
int level = 0;
wchar_t *str = &buff[pos];
int match_found=0;
while( (str >= buff) && *str)
{
if( *str == inc_char )
level++;
if( *str == dec_char )
level--;
if( level == 0 )
{
int pos2 = str-buff;
color[pos]|=HIGHLIGHT_MATCH<<8;
color[pos2]|=HIGHLIGHT_MATCH<<8;
match_found=1;
break;
}
str+= step;
}
if( !match_found )
color[pos] = HIGHLIGHT_ERROR<<8;
}
}
}
void highlight_universal( wchar_t * buff,
int *color,
int pos,
array_list_t *error )
{
int i;
for( i=0; buff[i] != 0; i++ )
color[i] = 0;
highlight_universal_internal( buff, color, pos, error );
}
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