rover.c

   1 #define _XOPEN_SOURCE_EXTENDED
   2
   3 #include <stdlib.h>
   4 #include <stdint.h>
   5 #include <ctype.h>
   6 #include <wchar.h>
   7 #include <wctype.h>
   8 #include <string.h>
   9 #include <sys/types.h>  /* pid_t, ... */
  10 #include <stdio.h>
  11 #include <limits.h>     /* PATH_MAX */
  12 #include <locale.h>     /* setlocale(), LC_ALL */
  13 #include <unistd.h>     /* chdir(), getcwd(), read(), close(), ... */
  14 #include <dirent.h>     /* DIR, struct dirent, opendir(), ... */
  15 #include <sys/stat.h>
  16 #include <fcntl.h>      /* open() */
  17 #include <sys/wait.h>   /* waitpid() */
  18 #include <signal.h>     /* struct sigaction, sigaction() */
  19 #include <errno.h>
  20 #include <curses.h>
  21
  22 #include "config.h"
  23
  24 /* String buffers. */
  25 #define ROWSZ 256
  26 static char ROW[ROWSZ];
  27 #define STATUSSZ 256
  28 static char STATUS[STATUSSZ];
  29 #define INPUTSZ 256
  30 static char INPUT[INPUTSZ];
  31
  32 /* Argument buffers for execvp(). */
  33 #define MAXARGS 256
  34 static char *ARGS[MAXARGS];
  35
  36 /* Listing view parameters. */
  37 #define HEIGHT      (LINES-4)
  38 #define STATUSPOS   (COLS-16)
  39
  40 /* Listing view flags. */
  41 #define SHOW_FILES      0x01u
  42 #define SHOW_DIRS       0x02u
  43 #define SHOW_HIDDEN     0x04u
  44
  45 /* Marks parameters. */
  46 #define BULK_INIT   5
  47 #define BULK_THRESH 256
  48
  49 /* Information associated to each entry in listing. */
  50 typedef struct Row {
  51     char *name;
  52     off_t size;
  53     mode_t mode;
  54     int islink;
  55     int marked;
  56 } Row;
  57
  58 /* Dynamic array of marked entries. */
  59 typedef struct Marks {
  60     char dirpath[PATH_MAX];
  61     int bulk;
  62     int nentries;
  63     char **entries;
  64 } Marks;
  65
  66 /* Line editing state. */
  67 typedef struct Edit {
  68     wchar_t buffer[INPUTSZ+1];
  69     int left, right;
  70 } Edit;
  71
  72 /* Global state. Some basic info is allocated for ten tabs. */
  73 static struct Rover {
  74     int tab;
  75     int nfiles;
  76     int scroll[10];
  77     int esel[10];
  78     uint8_t flags[10];
  79     Row *rows;
  80     WINDOW *window;
  81     char cwd[10][PATH_MAX];
  82     Marks marks;
  83     Edit edit;
  84     int edit_scroll;
  85     volatile sig_atomic_t pending_winch;
  86 } rover;
  87
  88 /* Macros for accessing global state. */
  89 #define ENAME(I)    rover.rows[I].name
  90 #define ESIZE(I)    rover.rows[I].size
  91 #define EMODE(I)    rover.rows[I].mode
  92 #define ISLINK(I)   rover.rows[I].islink
  93 #define MARKED(I)   rover.rows[I].marked
  94 #define SCROLL      rover.scroll[rover.tab]
  95 #define ESEL        rover.esel[rover.tab]
  96 #define FLAGS       rover.flags[rover.tab]
  97 #define CWD         rover.cwd[rover.tab]
  98
  99 /* Helpers. */
 100 #define MIN(A, B)   ((A) < (B) ? (A) : (B))
 101 #define MAX(A, B)   ((A) > (B) ? (A) : (B))
 102 #define ISDIR(E)    (strchr((E), '/') != NULL)
 103
 104 /* Line Editing Macros. */
 105 #define EDIT_FULL(E)       ((E).left == (E).right)
 106 #define EDIT_CAN_LEFT(E)   ((E).left)
 107 #define EDIT_CAN_RIGHT(E)  ((E).right < INPUTSZ-1)
 108 #define EDIT_LEFT(E)       (E).buffer[(E).right--] = (E).buffer[--(E).left]
 109 #define EDIT_RIGHT(E)      (E).buffer[(E).left++] = (E).buffer[++(E).right]
 110 #define EDIT_INSERT(E, C)  (E).buffer[(E).left++] = (C)
 111 #define EDIT_BACKSPACE(E)  (E).left--
 112 #define EDIT_DELETE(E)     (E).right++
 113 #define EDIT_CLEAR(E)      do { (E).left = 0; (E).right = INPUTSZ-1; } while(0)
 114
 115 typedef enum EditStat {CONTINUE, CONFIRM, CANCEL} EditStat;
 116 typedef enum Color {DEFAULT, RED, GREEN, YELLOW, BLUE, CYAN, MAGENTA, WHITE, BLACK} Color;
 117 typedef int (*PROCESS)(const char *path);
 118
 119 static void
 120 init_marks(Marks *marks)
 121 {
 122     strcpy(marks->dirpath, "");
 123     marks->bulk = BULK_INIT;
 124     marks->nentries = 0;
 125     marks->entries = calloc(marks->bulk, sizeof *marks->entries);
 126 }
 127
 128 /* Unmark all entries. */
 129 static void
 130 mark_none(Marks *marks)
 131 {
 132     int i;
 133
 134     strcpy(marks->dirpath, "");
 135     for (i = 0; i < marks->bulk && marks->nentries; i++)
 136         if (marks->entries[i]) {
 137             free(marks->entries[i]);
 138             marks->entries[i] = NULL;
 139             marks->nentries--;
 140         }
 141     if (marks->bulk > BULK_THRESH) {
 142         /* Reset bulk to free some memory. */
 143         free(marks->entries);
 144         marks->bulk = BULK_INIT;
 145         marks->entries = calloc(marks->bulk, sizeof *marks->entries);
 146     }
 147 }
 148
 149 static void
 150 add_mark(Marks *marks, char *dirpath, char *entry)
 151 {
 152     int i;
 153
 154     if (!strcmp(marks->dirpath, dirpath)) {
 155         /* Append mark to directory. */
 156         if (marks->nentries == marks->bulk) {
 157             /* Expand bulk to accomodate new entry. */
 158             int extra = marks->bulk / 2;
 159             marks->bulk += extra; /* bulk *= 1.5; */
 160             marks->entries = realloc(marks->entries,
 161                                      marks->bulk * sizeof *marks->entries);
 162             memset(&marks->entries[marks->nentries], 0,
 163                    extra * sizeof *marks->entries);
 164             i = marks->nentries;
 165         } else {
 166             /* Search for empty slot (there must be one). */
 167             for (i = 0; i < marks->bulk; i++)
 168                 if (!marks->entries[i])
 169                     break;
 170         }
 171     } else {
 172         /* Directory changed. Discard old marks. */
 173         mark_none(marks);
 174         strcpy(marks->dirpath, dirpath);
 175         i = 0;
 176     }
 177     marks->entries[i] = malloc(strlen(entry) + 1);
 178     strcpy(marks->entries[i], entry);
 179     marks->nentries++;
 180 }
 181
 182 static void
 183 del_mark(Marks *marks, char *entry)
 184 {
 185     int i;
 186
 187     if (marks->nentries > 1) {
 188         for (i = 0; i < marks->bulk; i++)
 189             if (marks->entries[i] && !strcmp(marks->entries[i], entry))
 190                 break;
 191         free(marks->entries[i]);
 192         marks->entries[i] = NULL;
 193         marks->nentries--;
 194     } else
 195         mark_none(marks);
 196 }
 197
 198 static void
 199 free_marks(Marks *marks)
 200 {
 201     int i;
 202
 203     for (i = 0; i < marks->bulk && marks->nentries; i++)
 204         if (marks->entries[i]) {
 205             free(marks->entries[i]);
 206             marks->nentries--;
 207         }
 208     free(marks->entries);
 209 }
 210
 211 static void
 212 handle_winch(int sig)
 213 {
 214     rover.pending_winch = 1;
 215 }
 216
 217 static void
 218 enable_handlers()
 219 {
 220     struct sigaction sa;
 221
 222     memset(&sa, 0, sizeof (struct sigaction));
 223     sa.sa_handler = handle_winch;
 224     sigaction(SIGWINCH, &sa, NULL);
 225 }
 226
 227 static void
 228 disable_handlers()
 229 {
 230     struct sigaction sa;
 231
 232     memset(&sa, 0, sizeof (struct sigaction));
 233     sa.sa_handler = SIG_DFL;
 234     sigaction(SIGWINCH, &sa, NULL);
 235 }
 236
 237 static void update_view();
 238
 239 /* Handle any signals received since last call. */
 240 static void
 241 sync_signals()
 242 {
 243     if (rover.pending_winch) {
 244         /* SIGWINCH received: resize application accordingly. */
 245         delwin(rover.window);
 246         endwin();
 247         refresh();
 248         clear();
 249         rover.window = subwin(stdscr, LINES - 2, COLS, 1, 0);
 250         SCROLL = MAX(ESEL - HEIGHT, 0);
 251         update_view();
 252         rover.pending_winch = 0;
 253     }
 254 }
 255
 256 /* This function must be used in place of getch().
 257    It handles signals while waiting for user input. */
 258 static int
 259 rover_getch()
 260 {
 261     int ch;
 262
 263     while ((ch = getch()) == ERR)
 264         sync_signals();
 265     return ch;
 266 }
 267
 268 /* This function must be used in place of get_wch().
 269    It handles signals while waiting for user input. */
 270 static wint_t
 271 rover_get_wch()
 272 {
 273     wint_t wch;
 274
 275     while (get_wch(&wch) == ERR)
 276         sync_signals();
 277     return wch;
 278 }
 279
 280 /* Do a fork-exec to external program (e.g. $EDITOR). */
 281 static void
 282 spawn()
 283 {
 284     pid_t pid;
 285     int status;
 286
 287     setenv("RVSEL", rover.nfiles ? ENAME(ESEL) : "", 1);
 288     pid = fork();
 289     if (pid > 0) {
 290         /* fork() succeeded. */
 291         disable_handlers();
 292         endwin();
 293         waitpid(pid, &status, 0);
 294         enable_handlers();
 295         kill(getpid(), SIGWINCH);
 296     } else if (pid == 0) {
 297         /* Child process. */
 298         execvp(ARGS[0], ARGS);
 299     }
 300 }
 301
 302 /* Curses setup. */
 303 static void
 304 init_term()
 305 {
 306     setlocale(LC_ALL, "");
 307     initscr();
 308     cbreak(); /* Get one character at a time. */
 309     timeout(100); /* For getch(). */
 310     noecho();
 311     nonl(); /* No NL->CR/NL on output. */
 312     intrflush(stdscr, FALSE);
 313     keypad(stdscr, TRUE);
 314     curs_set(FALSE); /* Hide blinking cursor. */
 315     if (has_colors()) {
 316         short bg;
 317         start_color();
 318 #ifdef NCURSES_EXT_FUNCS
 319         use_default_colors();
 320         bg = -1;
 321 #else
 322         bg = COLOR_BLACK;
 323 #endif
 324         init_pair(RED, COLOR_RED, bg);
 325         init_pair(GREEN, COLOR_GREEN, bg);
 326         init_pair(YELLOW, COLOR_YELLOW, bg);
 327         init_pair(BLUE, COLOR_BLUE, bg);
 328         init_pair(CYAN, COLOR_CYAN, bg);
 329         init_pair(MAGENTA, COLOR_MAGENTA, bg);
 330         init_pair(WHITE, COLOR_WHITE, bg);
 331         init_pair(BLACK, COLOR_BLACK, bg);
 332     }
 333     atexit((void (*)(void)) endwin);
 334     enable_handlers();
 335 }
 336
 337 /* Update the listing view. */
 338 static void
 339 update_view()
 340 {
 341     int i, j;
 342     int numsize;
 343     int ishidden, isdir;
 344     int marking;
 345     wchar_t wbuf[PATH_MAX];
 346
 347     mvhline(0, 0, ' ', COLS);
 348     attr_on(A_BOLD, NULL);
 349     color_set(RVC_TABNUM, NULL);
 350     mvaddch(0, COLS - 2, rover.tab + '0');
 351     attr_off(A_BOLD, NULL);
 352     if (rover.marks.nentries) {
 353         numsize = snprintf(STATUS, STATUSSZ, "%d", rover.marks.nentries);
 354         color_set(RVC_MARKS, NULL);
 355         mvaddstr(0, COLS - 3 - numsize, STATUS);
 356     } else
 357         numsize = -1;
 358     color_set(RVC_CWD, NULL);
 359     mbstowcs(wbuf, CWD, PATH_MAX);
 360     mvaddnwstr(0, 0, wbuf, COLS - 4 - numsize);
 361     wcolor_set(rover.window, RVC_BORDER, NULL);
 362     wborder(rover.window, 0, 0, 0, 0, 0, 0, 0, 0);
 363     /* Selection might not be visible, due to cursor wrapping or window
 364        shrinking. In that case, the scroll must be moved to make it visible. */
 365     SCROLL = MAX(MIN(SCROLL, ESEL), ESEL - HEIGHT + 1);
 366     marking = !strcmp(CWD, rover.marks.dirpath);
 367     for (i = 0, j = SCROLL; i < HEIGHT && j < rover.nfiles; i++, j++) {
 368         ishidden = ENAME(j)[0] == '.';
 369         isdir = S_ISDIR(EMODE(j));
 370         if (j == ESEL)
 371             wattr_on(rover.window, A_REVERSE, NULL);
 372         if (ISLINK(j))
 373             wcolor_set(rover.window, RVC_LINK, NULL);
 374         else if (ishidden)
 375             wcolor_set(rover.window, RVC_HIDDEN, NULL);
 376         else if (isdir)
 377             wcolor_set(rover.window, RVC_DIR, NULL);
 378         else
 379             wcolor_set(rover.window, RVC_FILE, NULL);
 380         if (!isdir) {
 381             char *suffix, *suffixes = "BKMGTPEZY";
 382             off_t human_size = ESIZE(j) * 10;
 383             int length = mbstowcs(NULL, ENAME(j), 0);
 384             for (suffix = suffixes; human_size >= 10240; suffix++)
 385                 human_size = (human_size + 512) / 1024;
 386             if (*suffix == 'B')
 387                 swprintf(wbuf, PATH_MAX, L"%s%*d %c", ENAME(j),
 388                          (int) (COLS - length - 6),
 389                          (int) human_size / 10, *suffix);
 390             else
 391                 swprintf(wbuf, PATH_MAX, L"%s%*d.%d %c", ENAME(j),
 392                          (int) (COLS - length - 8),
 393                          (int) human_size / 10, (int) human_size % 10, *suffix);
 394         } else
 395             mbstowcs(wbuf, ENAME(j), PATH_MAX);
 396         mvwhline(rover.window, i + 1, 1, ' ', COLS - 2);
 397         mvwaddnwstr(rover.window, i + 1, 2, wbuf, COLS - 4);
 398         if (marking && MARKED(j)) {
 399             wcolor_set(rover.window, RVC_MARKS, NULL);
 400             mvwaddch(rover.window, i + 1, 1, RVS_MARK);
 401         } else
 402             mvwaddch(rover.window, i + 1, 1, ' ');
 403         if (j == ESEL)
 404             wattr_off(rover.window, A_REVERSE, NULL);
 405     }
 406     for (; i < HEIGHT; i++)
 407         mvwhline(rover.window, i + 1, 1, ' ', COLS - 2);
 408     if (rover.nfiles > HEIGHT) {
 409         int center, height;
 410         center = (SCROLL + (HEIGHT / 2)) * HEIGHT / rover.nfiles;
 411         height = (HEIGHT-1) * HEIGHT / rover.nfiles;
 412         if (!height) height = 1;
 413         wcolor_set(rover.window, RVC_SCROLLBAR, NULL);
 414         mvwvline(rover.window, center-(height/2)+1, COLS-1, RVS_SCROLLBAR, height);
 415     }
 416     STATUS[0] = FLAGS & SHOW_FILES  ? 'F' : ' ';
 417     STATUS[1] = FLAGS & SHOW_DIRS   ? 'D' : ' ';
 418     STATUS[2] = FLAGS & SHOW_HIDDEN ? 'H' : ' ';
 419     if (!rover.nfiles)
 420         strcpy(ROW, "0/0");
 421     else
 422         snprintf(ROW, ROWSZ, "%d/%d", ESEL + 1, rover.nfiles);
 423     snprintf(STATUS+3, STATUSSZ-3, "%12s", ROW);
 424     color_set(RVC_STATUS, NULL);
 425     mvaddstr(LINES - 1, STATUSPOS, STATUS);
 426     wrefresh(rover.window);
 427 }
 428
 429 /* Show a message on the status bar. */
 430 static void
 431 message(const char *msg, Color color)
 432 {
 433     int len, pos;
 434
 435     len = strlen(msg);
 436     pos = (STATUSPOS - len) / 2;
 437     attr_on(A_BOLD, NULL);
 438     color_set(color, NULL);
 439     mvaddstr(LINES - 1, pos, msg);
 440     color_set(DEFAULT, NULL);
 441     attr_off(A_BOLD, NULL);
 442 }
 443
 444 /* Clear message area, leaving only status info. */
 445 static void
 446 clear_message()
 447 {
 448     mvhline(LINES - 1, 0, ' ', STATUSPOS);
 449 }
 450
 451 /* Comparison used to sort listing entries. */
 452 static int
 453 rowcmp(const void *a, const void *b)
 454 {
 455     int isdir1, isdir2, cmpdir;
 456     const Row *r1 = a;
 457     const Row *r2 = b;
 458     isdir1 = S_ISDIR(r1->mode);
 459     isdir2 = S_ISDIR(r2->mode);
 460     cmpdir = isdir2 - isdir1;
 461     return cmpdir ? cmpdir : strcoll(r1->name, r2->name);
 462 }
 463
 464 /* Get all entries in current working directory. */
 465 static int
 466 ls(Row **rowsp, uint8_t flags)
 467 {
 468     DIR *dp;
 469     struct dirent *ep;
 470     struct stat statbuf;
 471     Row *rows;
 472     int i, n;
 473
 474     if(!(dp = opendir("."))) return -1;
 475     n = -2; /* We don't want the entries "." and "..". */
 476     while (readdir(dp)) n++;
 477     rewinddir(dp);
 478     rows = malloc(n * sizeof *rows);
 479     i = 0;
 480     while ((ep = readdir(dp))) {
 481         if (!strcmp(ep->d_name, ".") || !strcmp(ep->d_name, ".."))
 482             continue;
 483         if (!(flags & SHOW_HIDDEN) && ep->d_name[0] == '.')
 484             continue;
 485         lstat(ep->d_name, &statbuf);
 486         rows[i].islink = S_ISLNK(statbuf.st_mode);
 487         stat(ep->d_name, &statbuf);
 488         if (S_ISDIR(statbuf.st_mode)) {
 489             if (flags & SHOW_DIRS) {
 490                 rows[i].name = malloc(strlen(ep->d_name) + 2);
 491                 strcpy(rows[i].name, ep->d_name);
 492                 strcat(rows[i].name, "/");
 493                 rows[i].mode = statbuf.st_mode;
 494                 i++;
 495             }
 496         } else if (flags & SHOW_FILES) {
 497             rows[i].name = malloc(strlen(ep->d_name) + 1);
 498             strcpy(rows[i].name, ep->d_name);
 499             rows[i].size = statbuf.st_size;
 500             rows[i].mode = statbuf.st_mode;
 501             i++;
 502         }
 503     }
 504     n = i; /* Ignore unused space in array caused by filters. */
 505     qsort(rows, n, sizeof (*rows), rowcmp);
 506     closedir(dp);
 507     *rowsp = rows;
 508     return n;
 509 }
 510
 511 static void
 512 free_rows(Row **rowsp, int nfiles)
 513 {
 514     int i;
 515
 516     for (i = 0; i < nfiles; i++)
 517         free((*rowsp)[i].name);
 518     free(*rowsp);
 519     *rowsp = NULL;
 520 }
 521
 522 /* Change working directory to the path in CWD. */
 523 static void
 524 cd(int reset)
 525 {
 526     int i, j;
 527
 528     message("Loading...", CYAN);
 529     refresh();
 530     if (reset) ESEL = SCROLL = 0;
 531     chdir(CWD);
 532     if (rover.nfiles)
 533         free_rows(&rover.rows, rover.nfiles);
 534     rover.nfiles = ls(&rover.rows, FLAGS);
 535     if (!strcmp(CWD, rover.marks.dirpath)) {
 536         for (i = 0; i < rover.nfiles; i++) {
 537             for (j = 0; j < rover.marks.bulk; j++)
 538                 if (
 539                     rover.marks.entries[j] &&
 540                     !strcmp(rover.marks.entries[j], ENAME(i))
 541                 )
 542                     break;
 543             MARKED(i) = j < rover.marks.bulk;
 544         }
 545     } else
 546         for (i = 0; i < rover.nfiles; i++)
 547             MARKED(i) = 0;
 548     clear_message();
 549     update_view();
 550 }
 551
 552 /* Select a target entry, if it is present. */
 553 static void
 554 try_to_sel(const char *target)
 555 {
 556     ESEL = 0;
 557     if (!ISDIR(target))
 558         while ((ESEL+1) < rover.nfiles && S_ISDIR(EMODE(ESEL)))
 559             ESEL++;
 560     while ((ESEL+1) < rover.nfiles && strcoll(ENAME(ESEL), target) < 0)
 561         ESEL++;
 562     if (rover.nfiles > HEIGHT) {
 563         SCROLL = ESEL - (HEIGHT / 2);
 564         SCROLL = MIN(MAX(SCROLL, 0), rover.nfiles - HEIGHT);
 565     }
 566 }
 567
 568 /* Reload CWD, but try to keep selection. */
 569 static void
 570 reload()
 571 {
 572     if (rover.nfiles) {
 573         strcpy(INPUT, ENAME(ESEL));
 574         cd(1);
 575         try_to_sel(INPUT);
 576         update_view();
 577     } else
 578         cd(1);
 579 }
 580
 581 /* Recursively process a source directory using CWD as destination root.
 582    For each node (i.e. directory), do the following:
 583     1. call pre(destination);
 584     2. call proc() on every child leaf (i.e. files);
 585     3. recurse into every child node;
 586     4. call pos(source).
 587    E.g. to move directory /src/ (and all its contents) inside /dst/:
 588     strcpy(CWD, "/dst/");
 589     process_dir(adddir, movfile, deldir, "/src/"); */
 590 static int
 591 process_dir(PROCESS pre, PROCESS proc, PROCESS pos, const char *path)
 592 {
 593     int ret;
 594     DIR *dp;
 595     struct dirent *ep;
 596     struct stat statbuf;
 597     char subpath[PATH_MAX];
 598
 599     ret = 0;
 600     if (pre) {
 601         char dstpath[PATH_MAX];
 602         strcpy(dstpath, CWD);
 603         strcat(dstpath, path + strlen(rover.marks.dirpath));
 604         ret |= pre(dstpath);
 605     }
 606     if(!(dp = opendir(path))) return -1;
 607     while ((ep = readdir(dp))) {
 608         if (!strcmp(ep->d_name, ".") || !strcmp(ep->d_name, ".."))
 609             continue;
 610         snprintf(subpath, PATH_MAX, "%s%s", path, ep->d_name);
 611         stat(subpath, &statbuf);
 612         if (S_ISDIR(statbuf.st_mode)) {
 613             strcat(subpath, "/");
 614             ret |= process_dir(pre, proc, pos, subpath);
 615         } else
 616             ret |= proc(subpath);
 617     }
 618     closedir(dp);
 619     if (pos) ret |= pos(path);
 620     return ret;
 621 }
 622
 623 /* Process all marked entries using CWD as destination root.
 624    All marked entries that are directories will be recursively processed.
 625    See process_dir() for details on the parameters. */
 626 static void
 627 process_marked(PROCESS pre, PROCESS proc, PROCESS pos)
 628 {
 629     int i, ret;
 630     char path[PATH_MAX];
 631
 632     clear_message();
 633     message("Processing...", CYAN);
 634     refresh();
 635     for (i = 0; i < rover.marks.bulk; i++)
 636         if (rover.marks.entries[i]) {
 637             ret = 0;
 638             snprintf(path, PATH_MAX, "%s%s", rover.marks.dirpath, rover.marks.entries[i]);
 639             if (ISDIR(rover.marks.entries[i])) {
 640                 if (!strncmp(path, CWD, strlen(path)))
 641                     ret = -1;
 642                 else
 643                     ret = process_dir(pre, proc, pos, path);
 644             } else
 645                 ret = proc(path);
 646             if (!ret) del_mark(&rover.marks, rover.marks.entries[i]);
 647         }
 648     reload();
 649     if (!rover.marks.nentries)
 650         message("Done.", GREEN);
 651     else
 652         message("Some errors occured.", RED);
 653 }
 654
 655 /* Wrappers for file operations. */
 656 static PROCESS delfile = unlink;
 657 static PROCESS deldir = rmdir;
 658 static int addfile(const char *path) {
 659     /* Using creat(2) because mknod(2) doesn't seem to be portable. */
 660     int ret;
 661
 662     ret = creat(path, 0644);
 663     if (ret < 0) return ret;
 664     return close(ret);
 665 }
 666 static int cpyfile(const char *srcpath) {
 667     int src, dst, ret;
 668     size_t size;
 669     struct stat st;
 670     char buf[BUFSIZ];
 671     char dstpath[PATH_MAX];
 672
 673     ret = src = open(srcpath, O_RDONLY);
 674     if (ret < 0) return ret;
 675     ret = fstat(src, &st);
 676     if (ret < 0) return ret;
 677     strcpy(dstpath, CWD);
 678     strcat(dstpath, srcpath + strlen(rover.marks.dirpath));
 679     ret = dst = creat(dstpath, st.st_mode);
 680     if (ret < 0) return ret;
 681     while ((size = read(src, buf, BUFSIZ)) > 0) {
 682         write(dst, buf, size);
 683         sync_signals();
 684     }
 685     close(src);
 686     close(dst);
 687     return 0;
 688 }
 689 static int adddir(const char *path) {
 690     int ret;
 691     struct stat st;
 692
 693     ret = stat(CWD, &st);
 694     if (ret < 0) return ret;
 695     return mkdir(path, st.st_mode);
 696 }
 697 static int movfile(const char *srcpath) {
 698     int ret;
 699     char dstpath[PATH_MAX];
 700
 701     strcpy(dstpath, CWD);
 702     strcat(dstpath, srcpath + strlen(rover.marks.dirpath));
 703     ret = rename(srcpath, dstpath);
 704     if (ret < 0 && errno == EXDEV) {
 705         ret = cpyfile(srcpath);
 706         if (ret < 0) return ret;
 707         ret = delfile(srcpath);
 708     }
 709     return ret;
 710 }
 711
 712 static void
 713 start_line_edit(const char *init_input)
 714 {
 715     curs_set(TRUE);
 716     strncpy(INPUT, init_input, INPUTSZ);
 717     rover.edit.left = mbstowcs(rover.edit.buffer, init_input, INPUTSZ);
 718     rover.edit.right = INPUTSZ - 1;
 719     rover.edit.buffer[INPUTSZ] = L'\0';
 720     rover.edit_scroll = 0;
 721 }
 722
 723 /* Read input and change editing state accordingly. */
 724 static EditStat
 725 get_line_edit()
 726 {
 727     wchar_t eraser, killer;
 728     int length;
 729     wchar_t wch = (wchar_t) rover_get_wch();
 730
 731     erasewchar(&eraser);
 732     killwchar(&killer);
 733     if (wch == L'\r' || wch == L'\n' || wch == KEY_ENTER) {
 734         curs_set(FALSE);
 735         return CONFIRM;
 736     } else if (wch == L'\t') {
 737         curs_set(FALSE);
 738         return CANCEL;
 739     } else if (wch == KEY_LEFT) {
 740         if (EDIT_CAN_LEFT(rover.edit)) EDIT_LEFT(rover.edit);
 741     } else if (wch == KEY_RIGHT) {
 742         if (EDIT_CAN_RIGHT(rover.edit)) EDIT_RIGHT(rover.edit);
 743     } else if (wch == KEY_UP) {
 744         while (EDIT_CAN_LEFT(rover.edit)) EDIT_LEFT(rover.edit);
 745     } else if (wch == KEY_DOWN) {
 746         while (EDIT_CAN_RIGHT(rover.edit)) EDIT_RIGHT(rover.edit);
 747     } else if (wch == eraser || wch == KEY_BACKSPACE) {
 748         if (EDIT_CAN_LEFT(rover.edit)) EDIT_BACKSPACE(rover.edit);
 749     } else if (wch == KEY_DC) {
 750         if (EDIT_CAN_RIGHT(rover.edit)) EDIT_DELETE(rover.edit);
 751     } else if (wch == killer) {
 752         EDIT_CLEAR(rover.edit);
 753         clear_message();
 754     } else if (iswprint(wch)) {
 755         if (!EDIT_FULL(rover.edit)) EDIT_INSERT(rover.edit, wch);
 756     }
 757     /* Encode edit contents in INPUT. */
 758     rover.edit.buffer[rover.edit.left] = L'\0';
 759     length = wcstombs(INPUT, rover.edit.buffer, INPUTSZ);
 760     wcstombs(&INPUT[length], &rover.edit.buffer[rover.edit.right+1],
 761              INPUTSZ-length);
 762     return CONTINUE;
 763 }
 764
 765 /* Update line input on the screen. */
 766 static void
 767 update_input(char *prompt, Color color)
 768 {
 769     int plen, ilen, maxlen;
 770
 771     plen = strlen(prompt);
 772     ilen = mbstowcs(NULL, INPUT, 0);
 773     maxlen = STATUSPOS - plen - 2;
 774     if (ilen - rover.edit_scroll < maxlen)
 775         rover.edit_scroll = MAX(ilen - maxlen, 0);
 776     else if (rover.edit.left > rover.edit_scroll + maxlen - 1)
 777         rover.edit_scroll = rover.edit.left - maxlen;
 778     else if (rover.edit.left < rover.edit_scroll)
 779         rover.edit_scroll = MAX(rover.edit.left - maxlen, 0);
 780     color_set(RVC_PROMPT, NULL);
 781     mvaddstr(LINES - 1, 0, prompt);
 782     color_set(color, NULL);
 783     mvaddnstr(LINES - 1, plen, &INPUT[rover.edit_scroll], maxlen);
 784     mvaddch(LINES - 1, plen + MIN(ilen - rover.edit_scroll, maxlen + 1), ' ');
 785     color_set(DEFAULT, NULL);
 786     if (rover.edit_scroll)
 787         mvaddch(LINES - 1, plen - 1, '<');
 788     if (ilen > rover.edit_scroll + maxlen)
 789         mvaddch(LINES - 1, plen + maxlen, '>');
 790     move(LINES - 1, plen + rover.edit.left - rover.edit_scroll);
 791 }
 792
 793 int
 794 main(int argc, char *argv[])
 795 {
 796     int i, ch;
 797     char *program;
 798     const char *key;
 799     DIR *d;
 800     EditStat edit_stat;
 801     const char *save_cwd_file = NULL;
 802
 803     if (argc >= 2) {
 804         if (!strcmp(argv[1], "-v") || !strcmp(argv[1], "--version")) {
 805             printf("rover %s\n", RV_VERSION);
 806             return 0;
 807         } else if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")) {
 808             printf(
 809                 "Usage: rover [DIRECTORY [DIRECTORY [DIRECTORY [...]]]]\n"
 810                 "  or:  rover [OPTION]\n"
 811                 "Browse current working directory or the ones specified.\n\n"
 812                 "Options:\n"
 813                 "  -h, --help       print this help message and exit\n"
 814                 "  -v, --version    print program version and exit\n\n"
 815                 "See rover(1) for more information.\n\n"
 816                 "Rover homepage: <https://github.com/lecram/rover>.\n"
 817             );
 818             return 0;
 819         } else if (argc > 2 && !strcmp(argv[1], "--save-cwd")) {
 820             save_cwd_file = argv[2];
 821             argc -= 2; argv += 2;
 822         }
 823     }
 824     init_term();
 825     rover.nfiles = 0;
 826     for (i = 0; i < 10; i++) {
 827         rover.esel[i] = rover.scroll[i] = 0;
 828         rover.flags[i] = SHOW_FILES | SHOW_DIRS;
 829     }
 830     strcpy(rover.cwd[0], getenv("HOME"));
 831     for (i = 1; i < argc && i < 10; i++) {
 832         if ((d = opendir(argv[i]))) {
 833             realpath(argv[i], rover.cwd[i]);
 834             closedir(d);
 835         } else
 836             strcpy(rover.cwd[i], rover.cwd[0]);
 837     }
 838     getcwd(rover.cwd[i], PATH_MAX);
 839     for (i++; i < 10; i++)
 840         strcpy(rover.cwd[i], rover.cwd[i-1]);
 841     for (i = 0; i < 10; i++)
 842         if (rover.cwd[i][strlen(rover.cwd[i]) - 1] != '/')
 843             strcat(rover.cwd[i], "/");
 844     rover.tab = 1;
 845     rover.window = subwin(stdscr, LINES - 2, COLS, 1, 0);
 846     init_marks(&rover.marks);
 847     cd(1);
 848     while (1) {
 849         ch = rover_getch();
 850         key = keyname(ch);
 851         clear_message();
 852         if (!strcmp(key, RVK_QUIT)) break;
 853         else if (ch >= '0' && ch <= '9') {
 854             rover.tab = ch - '0';
 855             cd(0);
 856         } else if (!strcmp(key, RVK_HELP)) {
 857             ARGS[0] = "man";
 858             ARGS[1] = "rover";
 859             ARGS[2] = NULL;
 860             spawn();
 861         } else if (!strcmp(key, RVK_DOWN)) {
 862             if (!rover.nfiles) continue;
 863             ESEL = (ESEL + 1) % rover.nfiles;
 864             update_view();
 865         } else if (!strcmp(key, RVK_UP)) {
 866             if (!rover.nfiles) continue;
 867             ESEL = ESEL ? ESEL - 1 : rover.nfiles - 1;
 868             update_view();
 869         } else if (!strcmp(key, RVK_JUMP_DOWN)) {
 870             if (!rover.nfiles) continue;
 871             ESEL = MIN(ESEL + RV_JUMP, rover.nfiles - 1);
 872             if (rover.nfiles > HEIGHT)
 873                 SCROLL = MIN(SCROLL + RV_JUMP, rover.nfiles - HEIGHT);
 874             update_view();
 875         } else if (!strcmp(key, RVK_JUMP_UP)) {
 876             if (!rover.nfiles) continue;
 877             ESEL = MAX(ESEL - RV_JUMP, 0);
 878             SCROLL = MAX(SCROLL - RV_JUMP, 0);
 879             update_view();
 880         } else if (!strcmp(key, RVK_JUMP_TOP)) {
 881             if (!rover.nfiles) continue;
 882             ESEL = 0;
 883             SCROLL = 0;
 884             update_view();
 885         } else if (!strcmp(key, RVK_JUMP_BOTTOM)) {
 886             if (!rover.nfiles) continue;
 887             ESEL = rover.nfiles - 1;
 888             SCROLL = MAX(rover.nfiles - 1 - HEIGHT, 0);
 889             update_view();
 890         } else if (!strcmp(key, RVK_CD_DOWN)) {
 891             if (!rover.nfiles || !S_ISDIR(EMODE(ESEL))) continue;
 892             strcat(CWD, ENAME(ESEL));
 893             cd(1);
 894         } else if (!strcmp(key, RVK_CD_UP)) {
 895             char *dirname, first;
 896             if (!strcmp(CWD, "/")) continue;
 897             CWD[strlen(CWD) - 1] = '\0';
 898             dirname = strrchr(CWD, '/') + 1;
 899             first = dirname[0];
 900             dirname[0] = '\0';
 901             cd(1);
 902             dirname[0] = first;
 903             dirname[strlen(dirname)] = '/';
 904             try_to_sel(dirname);
 905             dirname[0] = '\0';
 906             update_view();
 907         } else if (!strcmp(key, RVK_HOME)) {
 908             strcpy(CWD, getenv("HOME"));
 909             if (CWD[strlen(CWD) - 1] != '/')
 910                 strcat(CWD, "/");
 911             cd(1);
 912         } else if (!strcmp(key, RVK_REFRESH)) {
 913             reload();
 914         } else if (!strcmp(key, RVK_SHELL)) {
 915             program = getenv("SHELL");
 916             if (program) {
 917                 ARGS[0] = program;
 918                 ARGS[1] = NULL;
 919                 spawn();
 920                 reload();
 921             }
 922         } else if (!strcmp(key, RVK_VIEW)) {
 923             if (!rover.nfiles || S_ISDIR(EMODE(ESEL))) continue;
 924             program = getenv("PAGER");
 925             if (program) {
 926                 ARGS[0] = program;
 927                 ARGS[1] = ENAME(ESEL);
 928                 ARGS[2] = NULL;
 929                 spawn();
 930             }
 931         } else if (!strcmp(key, RVK_EDIT)) {
 932             if (!rover.nfiles || S_ISDIR(EMODE(ESEL))) continue;
 933             program = getenv("EDITOR");
 934             if (program) {
 935                 ARGS[0] = program;
 936                 ARGS[1] = ENAME(ESEL);
 937                 ARGS[2] = NULL;
 938                 spawn();
 939                 cd(0);
 940             }
 941         } else if (!strcmp(key, RVK_SEARCH)) {
 942             int oldsel, oldscroll, length;
 943             char *prompt = "search: ";
 944             if (!rover.nfiles) continue;
 945             oldsel = ESEL;
 946             oldscroll = SCROLL;
 947             start_line_edit("");
 948             update_input(prompt, DEFAULT);
 949             while ((edit_stat = get_line_edit()) == CONTINUE) {
 950                 int sel;
 951                 Color color = RED;
 952                 length = strlen(INPUT);
 953                 if (length) {
 954                     for (sel = 0; sel < rover.nfiles; sel++)
 955                         if (!strncmp(ENAME(sel), INPUT, length))
 956                             break;
 957                     if (sel < rover.nfiles) {
 958                         color = GREEN;
 959                         ESEL = sel;
 960                         if (rover.nfiles > HEIGHT) {
 961                             if (sel < 3)
 962                                 SCROLL = 0;
 963                             else if (sel - 3 > rover.nfiles - HEIGHT)
 964                                 SCROLL = rover.nfiles - HEIGHT;
 965                             else
 966                                 SCROLL = sel - 3;
 967                         }
 968                     }
 969                 } else {
 970                     ESEL = oldsel;
 971                     SCROLL = oldscroll;
 972                 }
 973                 update_view();
 974                 update_input(prompt, color);
 975             }
 976             if (edit_stat == CANCEL) {
 977                 ESEL = oldsel;
 978                 SCROLL = oldscroll;
 979             }
 980             clear_message();
 981             update_view();
 982         } else if (!strcmp(key, RVK_TG_FILES)) {
 983             FLAGS ^= SHOW_FILES;
 984             reload();
 985         } else if (!strcmp(key, RVK_TG_DIRS)) {
 986             FLAGS ^= SHOW_DIRS;
 987             reload();
 988         } else if (!strcmp(key, RVK_TG_HIDDEN)) {
 989             FLAGS ^= SHOW_HIDDEN;
 990             reload();
 991         } else if (!strcmp(key, RVK_NEW_FILE)) {
 992             int ok = 0;
 993             char *prompt = "new file: ";
 994             start_line_edit("");
 995             update_input(prompt, DEFAULT);
 996             while ((edit_stat = get_line_edit()) == CONTINUE) {
 997                 int length = strlen(INPUT);
 998                 ok = 1;
 999                 for (i = 0; i < rover.nfiles; i++) {
1000                     if (
1001                         !strncmp(ENAME(i), INPUT, length) &&
1002                         (!strcmp(ENAME(i) + length, "") ||
1003                          !strcmp(ENAME(i) + length, "/"))
1004                     ) {
1005                         ok = 0;
1006                         break;
1007                     }
1008                 }
1009                 update_input(prompt, ok ? GREEN : RED);
1010             }
1011             clear_message();
1012             if (edit_stat == CONFIRM && strlen(INPUT)) {
1013                 if (ok) {
1014                     addfile(INPUT);
1015                     cd(1);
1016                     try_to_sel(INPUT);
1017                     update_view();
1018                 } else
1019                     message("File already exists.", RED);
1020             }
1021         } else if (!strcmp(key, RVK_NEW_DIR)) {
1022             int ok = 0;
1023             char *prompt = "new directory: ";
1024             start_line_edit("");
1025             update_input(prompt, DEFAULT);
1026             while ((edit_stat = get_line_edit()) == CONTINUE) {
1027                 int length = strlen(INPUT);
1028                 ok = 1;
1029                 for (i = 0; i < rover.nfiles; i++) {
1030                     if (
1031                         !strncmp(ENAME(i), INPUT, length) &&
1032                         (!strcmp(ENAME(i) + length, "") ||
1033                          !strcmp(ENAME(i) + length, "/"))
1034                     ) {
1035                         ok = 0;
1036                         break;
1037                     }
1038                 }
1039                 update_input(prompt, ok ? GREEN : RED);
1040             }
1041             clear_message();
1042             if (edit_stat == CONFIRM && strlen(INPUT)) {
1043                 if (ok) {
1044                     adddir(INPUT);
1045                     cd(1);
1046                     try_to_sel(INPUT);
1047                     update_view();
1048                 } else
1049                     message("File already exists.", RED);
1050             }
1051         } else if (!strcmp(key, RVK_RENAME)) {
1052             int ok = 0;
1053             char *prompt = "rename: ";
1054             char *last;
1055             int isdir;
1056             strcpy(INPUT, ENAME(ESEL));
1057             last = INPUT + strlen(INPUT) - 1;
1058             if ((isdir = *last == '/'))
1059                 *last = '\0';
1060             start_line_edit(INPUT);
1061             update_input(prompt, RED);
1062             while ((edit_stat = get_line_edit()) == CONTINUE) {
1063                 int length = strlen(INPUT);
1064                 ok = 1;
1065                 for (i = 0; i < rover.nfiles; i++)
1066                     if (
1067                         !strncmp(ENAME(i), INPUT, length) &&
1068                         (!strcmp(ENAME(i) + length, "") ||
1069                          !strcmp(ENAME(i) + length, "/"))
1070                     ) {
1071                         ok = 0;
1072                         break;
1073                     }
1074                 update_input(prompt, ok ? GREEN : RED);
1075             }
1076             clear_message();
1077             if (edit_stat == CONFIRM && strlen(INPUT)) {
1078                 if (isdir)
1079                     strcat(INPUT, "/");
1080                 if (ok) {
1081                     if (!rename(ENAME(ESEL), INPUT) && MARKED(ESEL)) {
1082                         del_mark(&rover.marks, ENAME(ESEL));
1083                         add_mark(&rover.marks, CWD, INPUT);
1084                     }
1085                     cd(1);
1086                     try_to_sel(INPUT);
1087                     update_view();
1088                 } else
1089                     message("File already exists.", RED);
1090             }
1091         } else if (!strcmp(key, RVK_DELETE)) {
1092             if (rover.nfiles) {
1093                 message("Delete selected entry? (Y to confirm)", YELLOW);
1094                 if (rover_getch() == 'Y') {
1095                     const char *name = ENAME(ESEL);
1096                     int ret = S_ISDIR(EMODE(ESEL)) ? deldir(name) : delfile(name);
1097                     reload();
1098                     if (ret)
1099                         message("Could not delete entry.", RED);
1100                 } else
1101                     clear_message();
1102             } else
1103                   message("No entry selected for deletion.", RED);
1104         } else if (!strcmp(key, RVK_TG_MARK)) {
1105             if (MARKED(ESEL))
1106                 del_mark(&rover.marks, ENAME(ESEL));
1107             else
1108                 add_mark(&rover.marks, CWD, ENAME(ESEL));
1109             MARKED(ESEL) = !MARKED(ESEL);
1110             ESEL = (ESEL + 1) % rover.nfiles;
1111             update_view();
1112         } else if (!strcmp(key, RVK_INVMARK)) {
1113             for (i = 0; i < rover.nfiles; i++) {
1114                 if (MARKED(i))
1115                     del_mark(&rover.marks, ENAME(i));
1116                 else
1117                     add_mark(&rover.marks, CWD, ENAME(i));
1118                 MARKED(i) = !MARKED(i);
1119             }
1120             update_view();
1121         } else if (!strcmp(key, RVK_MARKALL)) {
1122             for (i = 0; i < rover.nfiles; i++)
1123                 if (!MARKED(i)) {
1124                     add_mark(&rover.marks, CWD, ENAME(i));
1125                     MARKED(i) = 1;
1126                 }
1127             update_view();
1128         } else if (!strcmp(key, RVK_MARK_DELETE)) {
1129             if (rover.marks.nentries) {
1130                 message("Delete marked entries? (Y to confirm)", YELLOW);
1131                 if (rover_getch() == 'Y')
1132                     process_marked(NULL, delfile, deldir);
1133                 else
1134                     clear_message();
1135             } else
1136                 message("No entries marked for deletion.", RED);
1137         } else if (!strcmp(key, RVK_MARK_COPY)) {
1138             if (rover.marks.nentries)
1139                 process_marked(adddir, cpyfile, NULL);
1140             else
1141                 message("No entries marked for copying.", RED);
1142         } else if (!strcmp(key, RVK_MARK_MOVE)) {
1143             if (rover.marks.nentries)
1144                 process_marked(adddir, movfile, deldir);
1145             else
1146                 message("No entries marked for moving.", RED);
1147         }
1148     }
1149     if (rover.nfiles)
1150         free_rows(&rover.rows, rover.nfiles);
1151     free_marks(&rover.marks);
1152     delwin(rover.window);
1153     if (save_cwd_file != NULL) {
1154         FILE *fd = fopen(save_cwd_file, "w");
1155         fputs(CWD, fd);
1156         fclose(fd);
1157     }
1158     return 0;
1159 }