/* User Menu implementation
   Copyright (C) 1994 Miguel de Icaza, Janne Kukonlehto
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include <config.h>
#include <stdio.h>
#include "tty.h"
#include <stdlib.h>	/* For free() */
#include "fs.h"
#include <string.h>
#include <ctype.h>
#include <errno.h>

#include "mad.h"
#include "util.h"
#include "global.h"
#include "dialog.h"
#include "color.h"
#include "dir.h"
#include "panel.h"
#include "main.h"
#include "user.h"
#include "layout.h"
#include "../vfs/vfs.h"

/* For the simple listbox manager */
#include "dlg.h"
#include "widget.h"
#include "wtools.h"

#include "view.h" /* for default_* externs */

/* "$Id: user.c,v 1.16 1995/02/21 19:07:28 miguel Exp $" */

#define MAX_ENTRIES 40
#define MAX_ENTRY_LEN 60

static char *data;
static char *entries [MAX_ENTRIES];
static int max_cols;
static int menu_lines;
static int debug_flag = 0;
static int debug_error = 0;
extern char *search_string (char *, char *);

/* Formats defined:
   %%  The % character
   %f  The current file (if non-local vfs, file will be copied locally and
       %f will be full path to it).
   %p  The current file
   %d  The current working directory
   %s  "Selected files"; the tagged files if any, otherwise the current file
   %t  Tagged files
   %u  Tagged files (and they are untagged on return from expand_format)
   %view Runs the commands and pipes standard output to the view command
       if %view is directly followed by '{', a list of keywords
       ascii, hex, nroff, unformated and

   If the format letter is in uppercase, it refers to the other panel.

   expand_format returns a memory block that must be free()d.
*/

/* Returns how many characters we should advance if %view was found */
int check_format_view (char *p)
{
    char *q = p;
    if (!strncmp (p, "view", 4)){
    	q += 4;
    	if (*q == '{'){
    	    for (q++;*q && *q != '}';q++){
    	    	if (!strncmp (q, "ascii", 5)){
    	    	    default_hex_mode = 0;
    	    	    q += 4;
    	    	} else if (!strncmp (q, "hex", 3)){
    	    	    default_hex_mode = 1;
    	    	    q += 2;
    	    	} else if (!strncmp (q, "nroff", 5)){
    	    	    default_nroff_flag = 1;
    	    	    q += 4;
    	    	} else if (!strncmp (q, "unformated", 10)){
    	    	    default_nroff_flag = 0;
    	    	    q += 9;
    	    	} 
    	    }
    	    if (*q == '}')
    	    	q++;
    	}
    	return q - p;
    } else
    	return 0;
}

int check_format_cd (char *p)
{
    if (!strncmp (p, "cd", 2))
    	return 3;
    else
    	return 0;
}

/* Check if p has a "^var\{var-name\}" */
/* Returns the number of skipped characters (zero on not found) */
/* V will be set to the expanded variable name */
int check_format_var (char *p, char **v)
{
    char *q = p;
    char *var_name;
    char *value;
    char *dots;
    
    *v = 0;
    dots = 0;
    if (!strncmp (p, "var{", 4)){
	for (q += 4; *q && *q != '}'; q++){
	    if (*q == ':')
		dots = q+1;
	    ;
	}
	if (!*q)
	    return 0;

	if (!dots || dots == q+5){
	    message (1,
		     " Format error on file Extensions File ",
		     !dots ? " The %%var macro does not have a default "
		     :       " The %%var macros does not have a variable " );
	    return 0;
	}
	
	/* Copy the variable name */
	var_name = xmalloc (dots - p, "check_format_var");
	strncpy (var_name, p+4, dots-2 - (p+3));
	var_name [dots-2 - (p+3)] = 0;

	value = getenv (var_name);
	if (value){
	    *v = strdup (value);
	    return q-p;
	}
	free (var_name);
	var_name = xmalloc (q - dots + 1, "check_format_var_2");
	strncpy (var_name, dots, q - dots + 1);
	var_name [q-dots] = 0;
	*v = var_name;
	return q-p;
    }
    return 0;
}

/* strip file's extension */
char *strip_ext(char *ss)
{
    register char *s = ss;
    char *e = NULL;
    while(*s) {
        if(*s == '.') e = s;
        if(*s == PATH_SEP && e) e=NULL; /* '.' in *directory* name */
        s++;
    }
    if(e) *e = 0;
    return ss;
}

char *expand_format (char c)
{
    WPanel *panel;

    if (c == '%')
	return strdup ("%");
    
    if (c >= 'a')
	panel = current_panel;
    else {
	if (get_other_type () == view_listing){
	    panel = other_panel;
	} else
	    return strdup ("");
    }
    if (!panel)
	panel = cpanel;

    c |= 0x20;
    
    switch (c){
    case 'f': 
    case 'p': return strdup (panel->dir.list [panel->selected].fname);
    case 'b':
	return strip_ext(strdup (panel->dir.list [panel->selected].fname));
    case 'd': return strdup (panel->cwd);
    case 's':
	if (!panel->marked)
	    return strdup (panel->dir.list [panel->selected].fname);

	/* Fall through */

    case 't':
    case 'u':
    {
	int length = 2, i;
	char *block;
	
	for (i = 0; i < panel->count; i++)
	    if (panel->dir.list [i].f.marked)
		length += strlen (panel->dir.list [i].fname) + 1;

	block = xmalloc (length, "expand_format");
	*block = 0;
	for (i = 0; i < panel->count; i++)
	    if (panel->dir.list [i].f.marked){
		strcat (block, panel->dir.list [i].fname);
		strcat (block, " ");
		if (c == 'u')
		    file_mark (panel, i, 0);
	    }
	if (c == 'u'){
	    panel->marked = 0;
	    panel->total = 0;
	    panel->dirs_marked = 0;
	}
	return block;
    } /* sub case block */
    } /* switch */
    return strdup ("");
}

/* Checks for shell patterns defination */
char *check_patterns (char *p)
{
    const char *def_name = "shell_patterns=";
    int value;

    if (strncmp (p, def_name, sizeof (def_name)) == 0){
	p += strlen (def_name);
	value = *p++ - '0';
	if (value == 0 || value == 1)
	    easy_patterns = value;
	else
	    message (1, " Error ", " Invalid shell pattern defination \"%c\". ", value + '0');
    }
    while (*p == '\n' || *p == '\t' || *p == ' ') p++;
    return p;
}

/* Copies a whitespace separated argument from p to arg. Returns the
   point after argument. */
static char *extract_arg (char *p, char *arg)
{
    while (*p && (*p == ' ' || *p == '\t' || *p == '\n'))
	p++;
    while (*p && *p != ' ' && *p != '\t' && *p != '\n')
	*arg++ = *p++;
    *arg = 0;
    if (!*p || *p == '\n')
	p --;
    return p;
}

/* Tests whether the selected file in the panel is of any of the types
   specified in argument. */
static int test_type (WPanel *panel, char *arg)
{
    int result = 0; /* False by default */
    int st_mode = panel->dir.list [panel->selected].buf.st_mode;

    for (;*arg != 0; arg++){
	switch (*arg){
	case 'n':	/* Not a directory */
	    result |= !S_ISDIR (st_mode);
	    break;
	case 'r':	/* Regular file */
	    result |= S_ISREG (st_mode);
	    break;
	case 'd':	/* Directory */
	    result |= S_ISDIR (st_mode);
	    break;
	case 'l':	/* Link */
	    result |= S_ISLNK (st_mode);
	    break;
	case 'c':	/* Character special */
	    result |= S_ISCHR (st_mode);
	    break;
	case 'b':	/* Block special */
	    result |= S_ISBLK (st_mode);
	    break;
	case 'f':	/* Fifo (named pipe) */
	    result |= S_ISFIFO (st_mode);
	    break;
	case 's':	/* Socket */
	    result |= S_ISSOCK (st_mode);
	    break;
	case 'x':	/* Executable */
	    result |= (st_mode & 0111) ? 1 : 0;
	    break;
	case 't':
	    result |= panel->marked ? 1 : 0;
	    break;
	default:
	    debug_error = 1;
	    break;
	}
    }
    return result;
}

/* Calculates the truth value of the next condition starting from
   p. Returns the point after condition. */
static char *test_condition (char *p, int *condition)
{
    WPanel *panel;
    char arg [256];

    /* Handle one condition */
    for (;*p != '\n' && *p != '&' && *p != '|'; p++){
	if (*p == ' ' || *p == '\t')
	    continue;
	if (*p >= 'a')
	    panel = current_panel;
	else {
	    if (get_other_type () == view_listing)
		panel = other_panel;
	    else
		panel = NULL;
	}
	*p |= 0x20;

	switch (*p++){
	case '!':
	    p = test_condition (p, condition);
	    *condition = ! *condition;
	    p--;
	    break;
	case 'f':
	    p = extract_arg (p, arg);
	    *condition = panel && regexp_match (arg, panel->dir.list [panel->selected].fname, match_file);
	    break;
	case 'd':
	    p = extract_arg (p, arg);
	    *condition = panel && regexp_match (arg, panel->cwd, match_file);
	    break;
	case 't':
	    p = extract_arg (p, arg);
	    *condition = panel && test_type (panel, arg);
	    break;
	default:
	    debug_error = 1;
	    break;
	} /* switch */

    } /* while */
    return p;
}

/* General purpose condition debug output handler */
void debug_out (char *start, char *end, int cond)
{
    static char msg [256];
    int len;

    if (start == NULL && end == NULL){
	if (cond == 0){
	    /* Init */
	    msg [0] = 0;
	} else {
	    /* Show output */
	    if (!debug_flag)
		return;
	    len = strlen (msg);
	    if (len)
		msg [len - 1] = 0;
	    message (0, " Debug ", msg);
	    debug_flag = 0;
	}
    } else {
	/* Save debug info for later output */
	if (!debug_flag)
	    return;
	/* Save the result of the condition */
	if (debug_error){
	    strcat (msg, " ERROR: ");
	    debug_error = 0;
	}
	else if (cond)
	    strcat (msg, " True:  ");
	else
	    strcat (msg, " False: ");
	/* Copy condition statement */
	len = strlen (msg);
	if (end == NULL){
	    /* Copy one character */
	    msg [len] = *start;
	    msg [len + 1] = 0;
	} else {
	    /* Copy many characters */
	    while (start < end){
		msg [len++] = *start++;
	    }
	    msg [len] = 0;
	}
	strcat (msg, " \n");
    }
}

/* Calculates the truth value of one lineful of conditions. Returns
   the point just before the end of line. */
static char *test_line (char *p, int *result)
{
    int condition;
    char operator;
    char *debug_start, *debug_end;

    /* Init debugger */
    debug_out (NULL, NULL, 0);
    /* Repeat till end of line */
    while (*p && *p != '\n'){
	while (*p == ' ' || *p == '\t')
	    p++;
	if (!*p || *p == '\n')
	    break;
	operator = *p++;
	if (*p == '?'){
	    debug_flag = 1;
	    p++;
	}
	while (*p == ' ' || *p == '\t')
	    p++;
	if (!*p || *p == '\n')
	    break;
	condition = 1;	/* True by default */

	debug_start = p;
	p = test_condition (p, &condition);
	debug_end = p;
	/* Add one debug statement */
	debug_out (debug_start, debug_end, condition);

	switch (operator){
	case '+':
	case '=':
	    /* Assignment */
	    *result = condition;
	    break;
	case '&':	/* Logical and */
	    *result &= condition;
	    break;
	case '|':	/* Logical or */
	    *result |= condition;
	    break;
	default:
	    debug_error = 1;
	    break;
	} /* switch */
	/* Add one debug statement */
	debug_out (&operator, NULL, *result);
	
    } /* while (*p != '\n') */
    /* Report debug message */
    debug_out (NULL, NULL, 1);

    if (!*p || *p == '\n')
	p --;
    return p;
}

/* FIXME: recode this routine on version 3.0, it could be cleaner */
void execute_menu_command (char *s)
{
    char *commands;
    FILE *cmd_file;
    int  expand_prefix_found = 0;
    int parameter_found = 0;
    char prompt [80] = "";
    int  col;
    char *file_name = tmpnam (0);

#ifdef _OS_NT
    /* NT requires the command to end in .cmd */
    file_name = copy_strings (file_name, ".cmd", NULL);
#endif
    if ((cmd_file = fopen (file_name, "w+")) == NULL){
	message (1, " Error ", " Can't create temporary command file \n %s ",
		 unix_error_string (errno));
	return;
    }
    commands = strchr (s, '\n');
    if (!commands){
	fclose (cmd_file);
	unlink (file_name);
	return;
    }
    commands++;
    
    for (col = 0; *commands; commands++){
	if (col == 0 && (*commands != ' ' && *commands != '\t'))
	    break;
        else if (col == 0)
	    while (*commands == ' ' || *commands == '\t')
	        commands++;
	col++;
	if (*commands == '\n')
	    col = 0;
	if (parameter_found){
	    if (*commands == '}'){
		char *parameter;
		parameter_found = 0;
		parameter = input_dialog (" Parameter ", prompt, "");
		if (!parameter || !*parameter){
		    /* User canceled */
		    fclose (cmd_file);
		    unlink (file_name);
		    return;
		}
		fputs (parameter, cmd_file);
		free (parameter);
	    } else {
		int len = strlen (prompt);

		if (len+1 < sizeof (prompt)){
		    prompt [len] = *commands;
		    prompt [len+1] = 0;
		} else
		    prompt [sizeof (prompt)] = 0;
	    }
	} else if (expand_prefix_found){
	    expand_prefix_found = 0;
	    if (*commands == '{')
		parameter_found = 1;
	    else{
		char *text = expand_format (*commands);
		fputs (text, cmd_file);
		free (text);
	    }
	} else {
	    if (*commands == '%')
		expand_prefix_found = 1;
	    else
		fputc (*commands, cmd_file);
	}
    }
    fclose (cmd_file);
    chmod (file_name, S_IRWXU);
    execute (file_name);
    unlink (file_name);
}

void user_menu_cmd (void)
{
    char *menu, *p;
    int  col, i, accept_entry = 1;
    int  selected, old_patterns;
    Listbox *listbox;
    
    if (!vfs_current_is_local ()){
	message (1, " Oops... ",
	    " I can't run programs while logged on a non local directory ");
	return;
    }
    
    menu = copy_strings (home_dir, PATH_SEP_STR ".mc.menu", 0);
    if (!exist_file (menu)){
	free (menu);
	menu = copy_strings (LIBDIR, "mc.menu", 0);
    }

    if ((data = load_file (menu)) == NULL){
	message (1, " Error ", " Can't open file %s \n %s ",
		 menu, unix_error_string (errno));
	free (menu);
	return;
    }
    free (menu);
    
    max_cols = 0;
    for (i = 0; i < MAX_ENTRIES; i++)
	entries [i] = 0;
    selected = 0;

    /* Parse the menu file */
    old_patterns = easy_patterns;
    p = check_patterns (data);
    for (menu_lines = col = 0; *p; p++){
	if (col == 0 && !entries [menu_lines]){
	    if (*p == '#'){
		/* A commented menu entry */
		accept_entry = 1;
	    } else if (*p == '+'){
		if (*(p+1) == '='){
		    /* Combined adding and default */
		    p = test_line (++p, &accept_entry);
		    if (selected == 0 && accept_entry)
			selected = menu_lines;
		} else {
		    /* A condition for adding the entry */
		    p = test_line (p, &accept_entry);
		}
	    } else if (*p == '='){
		if (*(p+1) == '+'){
		    /* Combined adding and default */
		    p = test_line (++p, &accept_entry);
		    if (selected == 0 && accept_entry)
			selected = menu_lines;
		} else {
		    /* A condition for making the entry default */
		    i = 1;
		    p = test_line (p, &i);
		    if (selected == 0 && i)
			selected = menu_lines;
		}
	    }
	    else if (*p > ' ' && *p < 127){
		/* A menu entry title line */
		if (accept_entry)
		    entries [menu_lines] = p;
		else
		    accept_entry = 1;
	    }
	}
	if (menu_lines == MAX_ENTRIES)
	    break;
	if (*p == '\t')
	    *p = ' ';
	col++;
	if (*p == '\n'){
	    if (entries [menu_lines]){
		menu_lines++;
		accept_entry = 1;
	    }
	    max_cols = max (max_cols, col);
	    col = 0;
	}
    }
    max_cols = min (max (max_cols, col), MAX_ENTRY_LEN);

    /* Create listbox */
    listbox = create_listbox_window (max_cols+2, menu_lines, " User menu ",
				     "[Menu File Edit]");
    
    /* insert all the items found */
    for (i = 0; i < menu_lines; i++)
	LISTBOX_APPEND_TEXT (listbox, entries [i][0],
			     extract_line (entries [i],
					   entries [i]+MAX_ENTRY_LEN),
			     entries [i]);

    /* Select the default entry */
    listbox_select_by_number (listbox->list, selected);
    
    selected = run_listbox (listbox);
    if (selected >= 0)
	execute_menu_command (entries [selected]);

    easy_patterns = old_patterns;
    do_refresh ();
    free (data);
}
