mdw@git.distorted.org.uk Git - xtoys/blob - xcatch.c

   1 /* -*-c-*-
   2  *
   3  * $Id: xcatch.c,v 1.1 1998/12/15 23:46:50 mdw Exp $
   4  *
   5  * Catch input and trap it in an X window
   6  *
   7  * (c) 1998 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of the Edgeware X tools collection.
  13  *
  14  * X tools is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * X tools is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with X tools; if not, write to the Free Software Foundation,
  26  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: xcatch.c,v $
  32  * Revision 1.1  1998/12/15 23:46:50  mdw
  33  * New program: captures input and puts it in a window.
  34  *
  35  */
  36
  37 /*----- Header files ------------------------------------------------------*/
  38
  39 #include <errno.h>
  40 #include <signal.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44
  45 #include <sys/types.h>
  46 #include <sys/wait.h>
  47
  48 #include <fcntl.h>
  49 #include <unistd.h>
  50
  51 #include <gtk/gtk.h>
  52
  53 #include <mLib/dstr.h>
  54 #include <mLib/mdwopt.h>
  55 #include <mLib/report.h>
  56 #include <mLib/quis.h>
  57
  58 #include <mgLib/cancel.h>
  59 #include <mgLib/msg.h>
  60
  61 /*----- Inportant state ---------------------------------------------------*/
  62
  63 static unsigned int flags;
  64
  65 enum {
  66   f_closed = 1,
  67   f_bogus = 2
  68 };
  69
  70 GtkWidget *textbox = 0;
  71 GdkFont *font;
  72
  73 /*----- Main code ---------------------------------------------------------*/
  74
  75 /* --- The window's closed --- */
  76
  77 static void killwin(GtkWidget *w, gpointer p)
  78 {
  79   if (flags & f_closed)
  80     gtk_main_quit();
  81   else
  82     textbox = 0;
  83 }
  84
  85 /* --- Some input has arrived --- */
  86
  87 static void ready(gpointer data, gint fd, GdkInputCondition c)
  88 {
  89   char buf[1024];
  90   int count;
  91
  92   /* --- Read the next buffer of data --- */
  93
  94   if (!(c & GDK_INPUT_READ))
  95     return;
  96   count = read(fd, buf, sizeof(buf));
  97
  98   /* --- Decide what to do --- */
  99
 100   if (count < 0) {
 101     msg(":~OK", "error reading data: %s", strerror(errno));
 102     exit(EXIT_FAILURE);
 103   }
 104
 105   if (count == 0) {
 106     close(fd);
 107     if (textbox)
 108       flags |= f_closed;
 109     else
 110       gtk_main_quit();
 111     return;
 112   }
 113
 114   /* --- If there's no output window, create one --- */
 115
 116   if (!textbox) {
 117     GtkWidget *win;
 118     GtkWidget *t;
 119     GtkWidget *w;
 120
 121     win = gtk_dialog_new();
 122     gtk_signal_connect(GTK_OBJECT(win), "destroy",
 123                        GTK_SIGNAL_FUNC(killwin), 0);
 124
 125     t = gtk_table_new(2, 2, 0);
 126     gtk_container_border_width(GTK_CONTAINER(t), 8);
 127     gtk_box_pack_start(GTK_BOX(GTK_DIALOG(win)->vbox), t, 1, 1, 0);
 128     gtk_widget_show(t);
 129
 130     textbox = gtk_text_new(0, 0);
 131     gtk_table_attach(GTK_TABLE(t), textbox, 0, 1, 0, 1,
 132                      GTK_EXPAND | GTK_SHRINK | GTK_FILL,
 133                      GTK_EXPAND | GTK_SHRINK | GTK_FILL,
 134                      0, 0);
 135     gtk_text_set_editable(GTK_TEXT(textbox), 0);
 136     gtk_widget_set_usize(textbox, 500, 100);
 137     gtk_widget_show(textbox);
 138
 139     w = gtk_vscrollbar_new(GTK_TEXT(textbox)->vadj);
 140     gtk_table_attach(GTK_TABLE(t), w, 1, 2, 0, 1,
 141                      0, GTK_EXPAND | GTK_SHRINK | GTK_FILL, 0, 0);
 142     gtk_widget_show(w);
 143
 144     w = gtk_hscrollbar_new(GTK_TEXT(textbox)->hadj);
 145     gtk_table_attach(GTK_TABLE(t), w, 0, 1, 1, 2,
 146                      GTK_EXPAND | GTK_SHRINK | GTK_FILL, 0, 0, 0);
 147     gtk_widget_show(w);
 148
 149     gtk_box_set_homogeneous(GTK_BOX(GTK_DIALOG(win)->action_area), 0);
 150     w = gtk_button_new_with_label("Dismiss");
 151     gtk_signal_connect_object(GTK_OBJECT(w), "clicked",
 152                               GTK_SIGNAL_FUNC(gtk_object_destroy),
 153                               GTK_OBJECT(win));
 154     gtk_box_pack_end(GTK_BOX(GTK_DIALOG(win)->action_area), w, 0, 0, 0);
 155     GTK_WIDGET_SET_FLAGS(w, GTK_CAN_DEFAULT);
 156     gtk_widget_grab_default(w);
 157     cancel(GTK_WINDOW(win), w);
 158     gtk_widget_show(w);
 159
 160     gtk_widget_show(win);
 161   }
 162
 163   /* --- Append the new text --- */
 164
 165   gtk_text_insert(GTK_TEXT(textbox), font, 0, 0, buf, count);
 166 }
 167
 168 /* --- Signal handler --- */
 169
 170 static void reap(int sig)
 171 {
 172   while (waitpid(-1, 0, WNOHANG) > 0)
 173     ;
 174 }
 175
 176 /* --- Main program --- */
 177
 178 static void version(FILE *fp)
 179 {
 180   fprintf(fp, "%s (xtoys version " VERSION ")\n", QUIS);
 181 }
 182
 183 static void usage(FILE *fp)
 184 {
 185   fprintf(fp, "Usage: %s [-f file] [-F font] [command [args...]]\n", QUIS);
 186 }
 187
 188 int main(int argc, char *argv[])
 189 {
 190   int fd = -1;
 191
 192   ego(argv[0]);
 193
 194   gtk_init(&argc, &argv);
 195
 196   for (;;) {
 197     static struct option opt[] = {
 198       { "help",         0,              0,      'h' },
 199       { "usage",        0,              0,      'u' },
 200       { "version",      0,              0,      'v' },
 201       { "file",         gFlag_argReq,   0,      'f' },
 202       { "font",         gFlag_argReq,   0,      'F' },
 203       { 0,              0,              0,      0 }
 204     };
 205     int i = mdwopt(argc, argv, "huvf:F:", opt, 0, 0, 0);
 206
 207     if (i < 0)
 208       break;
 209
 210     switch (i) {
 211       case 'h':
 212         version(stdout);
 213         fputc('\n', stdout);
 214         usage(stdout);
 215         fputs(
 216 "\n"
 217 "Catches input from a pipe or other source, and captures it in a window.\n"
 218 "Nothing is displayed if there's no input.\n"
 219 "\n"
 220 "Options provided:\n"
 221 "\n"
 222 "-h, --help             Display this help text\n"
 223 "-u, --usage            Display a quick usage summary\n"
 224 "-v, --version          Display the version number\n"
 225 "-f, --file=FILE        Read input from the named file\n"
 226 "-F, --font=FONT        Display output in the named font\n",
 227           stdout);
 228         exit(0);
 229         break;
 230       case 'u':
 231         usage(stdout);
 232         exit(0);
 233         break;
 234       case 'v':
 235         version(stdout);
 236         exit(0);
 237         break;
 238       case 'f':
 239         if ((fd = open(optarg, O_RDONLY)) < 0) {
 240           die(1, "couldn't open file: %s", strerror(errno));
 241           exit(1);
 242         }
 243         break;
 244       case 'F':
 245         font = gdk_font_load(optarg);
 246         break;
 247       default:
 248         flags |= f_bogus;
 249         break;
 250     }
 251   }
 252
 253   if (flags & f_bogus) {
 254     usage(stderr);
 255     exit(1);
 256   }
 257
 258   if (fd == -1) {
 259     if (optind == argc)
 260       fd = STDIN_FILENO;
 261     else {
 262       int pfd[2];
 263       pid_t kid;
 264       struct sigaction sa;
 265
 266       /* --- Set up a signal handler --- */
 267
 268       sa.sa_handler = reap;
 269       sigemptyset(&sa.sa_mask);
 270       sa.sa_flags = 0;
 271       sigaction(SIGCHLD, &sa, 0);
 272
 273       /* --- Start a child program --- */
 274
 275       if (pipe(pfd))
 276         die(1, "couldn't open pipe: %s", strerror(errno));
 277       kid = fork();
 278       if (kid < 0)
 279         die(1, "couldn't fork: %s", strerror(errno));
 280       if (kid == 0) {
 281         dstr d;
 282
 283         close(pfd[0]);
 284         if (pfd[1] != STDOUT_FILENO)
 285           dup2(pfd[1], STDOUT_FILENO);
 286         if (pfd[1] != STDERR_FILENO)
 287           dup2(pfd[1], STDERR_FILENO);
 288         if (pfd[1] != STDOUT_FILENO && pfd[1] != STDERR_FILENO)
 289           close(pfd[1]);
 290         execvp(argv[optind], argv + optind);
 291
 292         dstr_create(&d);
 293         dstr_putf(&d, "%s: couldn't run `%s': %s\n",
 294                   QUIS, argv[optind], strerror(errno));
 295         write(STDERR_FILENO, d.buf, d.len);
 296         _exit(127);
 297       }
 298       fd = pfd[0];
 299       close(pfd[1]);
 300     }
 301   }
 302
 303   gdk_input_add(fd, GDK_INPUT_READ, ready, 0);
 304   gtk_main();
 305   return (0);
 306 }
 307
 308 /*----- That's all, folks -------------------------------------------------*/