File: demo.c

package info (click to toggle)
yuma123 2.11-1
  • links: PTS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 20,900 kB
  • sloc: ansic: 179,975; cpp: 10,968; python: 5,839; sh: 2,287; makefile: 1,021; xml: 621; exp: 592; perl: 70
file content (203 lines) | stat: -rw-r--r-- 6,790 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
/*
 * Copyright (c) 2000, 2001, 2002, 2003, 2004 by Martin C. Shepherd
 * 
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, and/or sell copies of the Software, and to permit persons
 * to whom the Software is furnished to do so, provided that the above
 * copyright notice(s) and this permission notice appear in all copies of
 * the Software and that both the above copyright notice(s) and this
 * permission notice appear in supporting documentation.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
 * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
 * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 * 
 * Except as contained in this notice, the name of a copyright holder
 * shall not be used in advertising or otherwise to promote the sale, use
 * or other dealings in this Software without prior written authorization
 * of the copyright holder.
 */

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <locale.h>

#include <unistd.h>
#include <sys/stat.h>

#include "libtecla.h"

/* The function which displays the introductory text of the demo */

static void show_demo_introduction(GetLine *gl);

static char* my_tab_context_string_array[] = {"one", "two", "three", NULL};

static int my_tab_callback (WordCompletion *cpl,
                          void *data,
                          const char *line,
                          int word_end)
{
    int word_start;
    int i;
    int retval;
    for(word_start=word_end;word_start>0;word_start--) {
        if(line[word_start-1]==' ') break;
    }
    i=0;
    while(my_tab_context_string_array[i]!=NULL) {
        if(strlen(my_tab_context_string_array[i])>=(word_end-word_start)) {
            if(((word_end-word_start)==0) || (0==memcmp(line+word_start,my_tab_context_string_array[i],word_end-word_start))) {
                retval = cpl_add_completion(cpl, line, word_start, word_end,
                                            (const char *)my_tab_context_string_array[i]+word_end-word_start,
                                            (const char *)":num:", (const char *)" + ");
            }
        }
        i++;
    }
    return 0;
}

/*.......................................................................
 * This program demonstrates how to use gl_get_line() as a line editor to
 * to enable users to enter input. It takes no arguments.
 */
int main(int argc, char *argv[])
{
  char *line;             /* A line of input */
  GetLine *gl;            /* The line editor */
  int major,minor,micro;  /* The version number of the library */
  int retval;
/*
 * Create the line editor, specifying a max line length of 500 bytes,
 * and 10000 bytes to allocate to storage of historical input lines.
 */
  gl = new_GetLine(500, 5000);
  if(!gl)
    return 1;

  /* setup CLI tab line completion */
  retval = gl_customize_completion(gl,
                                   my_tab_context_string_array,
                                   my_tab_callback);
  if (retval != 0) {
    printf("\nError: cannot set GL tab completion");
    return 1;
  }
/*
 * If the user has the LC_CTYPE or LC_ALL environment variables set,
 * enable display of characters corresponding to the specified locale.
 */
  (void) setlocale(LC_CTYPE, "");
/*
 * Lookup and display the version number of the library.
 */
  libtecla_version(&major, &minor, &micro);
  printf("\n Welcome to the main demo program of libtecla version %d.%d.%d\n",
	 major, minor, micro);
/*
 * Display an introductory banner.
 */
  show_demo_introduction(gl);
/*
 * Load history.
 */
#ifndef WITHOUT_FILE_SYSTEM
  (void) gl_load_history(gl, "~/.demo_history", "#");
#endif
/*
 * Read lines of input from the user and print them to stdout.
 */
  do {
/*
 * Get a new line from the user.
 */
    line = gl_get_line(gl, "$ ", NULL, 0);
    if(!line)
      break;
/*
 * Display what was entered.
 */
    if(printf("You entered: %s", line) < 0 || fflush(stdout))
      break;
/*
 * If the user types "exit", quit the program.
 */
    if(strcmp(line, "exit\n")==0)
      break;
    else if(strcmp(line, "history\n")==0)
      gl_show_history(gl, stdout, "%N  %T   %H\n", 0, -1);
    else if(strcmp(line, "size\n")==0) {
      GlTerminalSize size = gl_terminal_size(gl, 80, 24);
      printf("Terminal size = %d columns x %d lines.\n", size.ncolumn,
	     size.nline);
    } else if(strcmp(line, "clear\n")==0) {
      if(gl_erase_terminal(gl))
	return 1;
    };
  } while(1);
/*
 * Save historical command lines.
 */
#ifndef WITHOUT_FILE_SYSTEM
  (void) gl_save_history(gl, "~/.demo_history", "#", -1);
#endif
/*
 * Clean up.
 */
  gl = del_GetLine(gl);
  return 0;
}

/*.......................................................................
 * Display introductory text to the user, formatted according to the
 * current terminal width and enclosed in a box of asterixes.
 *
 * Input:
 *  gl      GetLine *   The resource object of gl_get_line().
 */
static void show_demo_introduction(GetLine *gl)
{
  int start;     /* The column in which gl_display_text() left the cursor */
  int i;
/*
 * Break the indtroductory text into an array of strings, so as to
 * avoid overflowing any compiler string limits.
 */
  const char *doc[] = {
    "This program is a simple shell with which you can experiment with the ",
    "line editing and tab completion facilities provided by the gl_get_line() ",
    "function. The file demo.c also serves as a fully commented example ",
    "of how to use gl_get_line().\n"
  };
/*
 * Form the top line of the documentation box by filling the area of
 * the line between a " *" prefix and a "* " suffix with asterixes.
 */
  printf("\n");
  gl_display_text(gl, 0, " *", "* ", '*', 80, 0, "\n");
/*
 * Justify the documentation text within margins of asterixes.
 */
  for(start=0,i=0; i<sizeof(doc)/sizeof(doc[0]) && start >= 0; i++)
    start = gl_display_text(gl, 0, " * ", " * ", ' ', 80, start,doc[i]);
/*
 * Draw the bottom line of the documentation box.
 */
  gl_display_text(gl, 0, " *", "* ", '*', 80, 0, "\n");
  printf("\n");
}