402 lines
9.1 KiB
C
402 lines
9.1 KiB
C
/*
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* $Id: tailbox.c,v 1.68 2012/11/18 15:48:52 tom Exp $
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*
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* tailbox.c -- implements the tail box
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*
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* Copyright 2000-2011,2012 Thomas E. Dickey
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License, version 2.1
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to
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* Free Software Foundation, Inc.
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* 51 Franklin St., Fifth Floor
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* Boston, MA 02110, USA.
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*
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* An earlier version of this program lists as authors
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* Pasquale De Marco (demarco_p@abramo.it)
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*/
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#include <dialog.h>
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#include <dlg_keys.h>
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#include <sys/stat.h>
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typedef struct {
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DIALOG_CALLBACK obj;
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WINDOW *text;
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const char **buttons;
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int hscroll;
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int old_hscroll;
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char line[MAX_LEN + 2];
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off_t last_pos;
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} MY_OBJ;
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/*
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* Return current line of text.
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*/
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static char *
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get_line(MY_OBJ * obj)
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{
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FILE *fp = obj->obj.input;
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int col = -(obj->hscroll);
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int j, tmpint, ch;
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do {
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if (((ch = getc(fp)) == EOF) && !feof(fp))
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dlg_exiterr("Error moving file pointer in get_line().");
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else if (!feof(fp) && (ch != '\n')) {
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if ((ch == TAB) && (dialog_vars.tab_correct)) {
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tmpint = dialog_state.tab_len
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- ((col + obj->hscroll) % dialog_state.tab_len);
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for (j = 0; j < tmpint; j++) {
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if (col >= 0 && col < MAX_LEN)
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obj->line[col] = ' ';
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++col;
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}
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} else {
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if (col >= 0)
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obj->line[col] = (char) ch;
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++col;
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}
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if (col >= MAX_LEN)
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break;
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}
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} while (!feof(fp) && (ch != '\n'));
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if (col < 0)
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col = 0;
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obj->line[col] = '\0';
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return obj->line;
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}
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/*
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* Print a new line of text.
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*/
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static void
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print_line(MY_OBJ * obj, WINDOW *win, int row, int width)
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{
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int i, y, x;
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char *line = get_line(obj);
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(void) wmove(win, row, 0); /* move cursor to correct line */
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(void) waddch(win, ' ');
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#ifdef NCURSES_VERSION
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(void) waddnstr(win, line, MIN((int) strlen(line), width - 2));
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#else
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line[MIN((int) strlen(line), width - 2)] = '\0';
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waddstr(win, line);
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#endif
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getyx(win, y, x);
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(void) y;
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/* Clear 'residue' of previous line */
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for (i = 0; i < width - x; i++)
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(void) waddch(win, ' ');
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}
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/*
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* Go back 'target' lines in text file. BUFSIZ has to be in 'size_t' range.
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*/
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static void
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last_lines(MY_OBJ * obj, int target)
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{
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FILE *fp = obj->obj.input;
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size_t inx;
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int count = 0;
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char buf[BUFSIZ + 1];
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size_t size_to_read;
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size_t size_as_read;
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long offset = 0;
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long fpos = 0;
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if (fseek(fp, 0L, SEEK_END) == -1
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|| (fpos = ftell(fp)) < 0)
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dlg_exiterr("Error moving file pointer in last_lines().");
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if (fpos != 0) {
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++target;
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for (;;) {
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if (fpos >= BUFSIZ) {
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size_to_read = BUFSIZ;
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} else {
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size_to_read = (size_t) fpos;
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}
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fpos = fpos - (long) size_to_read;
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if (fseek(fp, fpos, SEEK_SET) == -1)
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dlg_exiterr("Error moving file pointer in last_lines().");
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size_as_read = fread(buf, sizeof(char), size_to_read, fp);
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if (ferror(fp))
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dlg_exiterr("Error reading file in last_lines().");
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if (size_as_read == 0) {
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fpos = 0;
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offset = 0;
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break;
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}
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offset += (long) size_as_read;
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for (inx = size_as_read - 1; inx != 0; --inx) {
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if (buf[inx] == '\n') {
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if (++count > target)
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break;
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offset = (long) (inx + 1);
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}
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}
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if (count > target) {
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break;
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} else if (fpos == 0) {
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offset = 0;
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break;
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}
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}
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if (fseek(fp, fpos + offset, SEEK_SET) == -1)
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dlg_exiterr("Error moving file pointer in last_lines().");
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}
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}
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/*
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* Print a new page of text.
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*/
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static void
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print_page(MY_OBJ * obj, int height, int width)
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{
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int i;
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for (i = 0; i < height; i++) {
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print_line(obj, obj->text, i, width);
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}
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(void) wnoutrefresh(obj->text);
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}
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static void
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print_last_page(MY_OBJ * obj)
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{
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int high = getmaxy(obj->obj.win) - (2 * MARGIN + (obj->obj.bg_task ? 1 : 3));
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int wide = getmaxx(obj->text);
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last_lines(obj, high);
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print_page(obj, high, wide);
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}
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static void
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repaint_text(MY_OBJ * obj)
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{
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FILE *fp = obj->obj.input;
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int cur_y, cur_x;
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getyx(obj->obj.win, cur_y, cur_x);
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obj->old_hscroll = obj->hscroll;
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print_last_page(obj);
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obj->last_pos = ftell(fp);
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(void) wmove(obj->obj.win, cur_y, cur_x); /* Restore cursor position */
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wrefresh(obj->obj.win);
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}
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static bool
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handle_input(DIALOG_CALLBACK * cb)
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{
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MY_OBJ *obj = (MY_OBJ *) cb;
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FILE *fp = obj->obj.input;
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struct stat sb;
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if (fstat(fileno(fp), &sb) == 0
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&& sb.st_size != obj->last_pos) {
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repaint_text(obj);
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}
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return TRUE;
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}
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static bool
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handle_my_getc(DIALOG_CALLBACK * cb, int ch, int fkey, int *result)
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{
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MY_OBJ *obj = (MY_OBJ *) cb;
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bool done = FALSE;
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if (!fkey && dlg_char_to_button(ch, obj->buttons) == 0) {
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ch = DLGK_ENTER;
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fkey = TRUE;
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}
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if (fkey) {
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switch (ch) {
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case DLGK_ENTER:
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*result = DLG_EXIT_OK;
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done = TRUE;
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break;
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case DLGK_BEGIN: /* Beginning of line */
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obj->hscroll = 0;
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break;
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case DLGK_GRID_LEFT: /* Scroll left */
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if (obj->hscroll > 0) {
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obj->hscroll -= 1;
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}
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break;
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case DLGK_GRID_RIGHT: /* Scroll right */
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if (obj->hscroll < MAX_LEN)
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obj->hscroll += 1;
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break;
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default:
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beep();
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break;
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}
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if ((obj->hscroll != obj->old_hscroll))
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repaint_text(obj);
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} else {
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switch (ch) {
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case ERR:
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clearerr(cb->input);
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ch = getc(cb->input);
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(void) ungetc(ch, cb->input);
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if (ch != EOF) {
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handle_input(cb);
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}
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break;
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case ESC:
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done = TRUE;
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*result = DLG_EXIT_ESC;
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break;
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default:
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beep();
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break;
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}
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}
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return !done;
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}
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/*
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* Display text from a file in a dialog box, like in a "tail -f".
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*/
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int
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dialog_tailbox(const char *title, const char *file, int height, int width, int bg_task)
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{
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/* *INDENT-OFF* */
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static DLG_KEYS_BINDING binding[] = {
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HELPKEY_BINDINGS,
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ENTERKEY_BINDINGS,
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DLG_KEYS_DATA( DLGK_BEGIN, '0' ),
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DLG_KEYS_DATA( DLGK_BEGIN, KEY_BEG ),
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DLG_KEYS_DATA( DLGK_GRID_LEFT, 'H' ),
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DLG_KEYS_DATA( DLGK_GRID_LEFT, 'h' ),
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DLG_KEYS_DATA( DLGK_GRID_LEFT, KEY_LEFT ),
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DLG_KEYS_DATA( DLGK_GRID_RIGHT, 'L' ),
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DLG_KEYS_DATA( DLGK_GRID_RIGHT, 'l' ),
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DLG_KEYS_DATA( DLGK_GRID_RIGHT, KEY_RIGHT ),
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END_KEYS_BINDING
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};
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/* *INDENT-ON* */
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#ifdef KEY_RESIZE
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int old_height = height;
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int old_width = width;
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#endif
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int fkey;
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int x, y, result, thigh;
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WINDOW *dialog, *text;
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const char **buttons = 0;
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MY_OBJ *obj;
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FILE *fd;
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int min_width = 12;
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/* Open input file for reading */
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if ((fd = fopen(file, "rb")) == NULL)
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dlg_exiterr("Can't open input file in dialog_tailbox().");
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#ifdef KEY_RESIZE
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retry:
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#endif
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dlg_auto_sizefile(title, file, &height, &width, 2, min_width);
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dlg_print_size(height, width);
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dlg_ctl_size(height, width);
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x = dlg_box_x_ordinate(width);
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y = dlg_box_y_ordinate(height);
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thigh = height - ((2 * MARGIN) + (bg_task ? 0 : 2));
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dialog = dlg_new_window(height, width, y, x);
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dlg_mouse_setbase(x, y);
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/* Create window for text region, used for scrolling text */
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text = dlg_sub_window(dialog,
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thigh,
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width - (2 * MARGIN),
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y + MARGIN,
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x + MARGIN);
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dlg_draw_box2(dialog, 0, 0, height, width, dialog_attr, border_attr, border2_attr);
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dlg_draw_bottom_box2(dialog, border_attr, border2_attr, dialog_attr);
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dlg_draw_title(dialog, title);
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dlg_draw_helpline(dialog, FALSE);
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if (!bg_task) {
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buttons = dlg_exit_label();
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dlg_button_layout(buttons, &min_width);
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dlg_draw_buttons(dialog, height - (2 * MARGIN), 0, buttons, FALSE,
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FALSE, width);
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}
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(void) wmove(dialog, thigh, (MARGIN + 1));
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(void) wnoutrefresh(dialog);
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obj = dlg_calloc(MY_OBJ, 1);
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assert_ptr(obj, "dialog_tailbox");
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obj->obj.input = fd;
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obj->obj.win = dialog;
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obj->obj.handle_getc = handle_my_getc;
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obj->obj.handle_input = bg_task ? handle_input : 0;
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obj->obj.keep_bg = bg_task && dialog_vars.cant_kill;
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obj->obj.bg_task = bg_task;
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obj->text = text;
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obj->buttons = buttons;
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dlg_add_callback(&(obj->obj));
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dlg_register_window(dialog, "tailbox", binding);
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dlg_register_buttons(dialog, "tailbox", buttons);
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/* Print last page of text */
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dlg_attr_clear(text, thigh, getmaxx(text), dialog_attr);
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repaint_text(obj);
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dlg_trace_win(dialog);
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if (bg_task) {
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result = DLG_EXIT_OK;
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} else {
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int ch;
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do {
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ch = dlg_getc(dialog, &fkey);
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#ifdef KEY_RESIZE
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if (fkey && ch == KEY_RESIZE) {
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/* reset data */
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height = old_height;
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width = old_width;
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/* repaint */
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dlg_clear();
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dlg_del_window(dialog);
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refresh();
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dlg_mouse_free_regions();
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dlg_button_layout(buttons, &min_width);
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goto retry;
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}
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#endif
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}
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while (handle_my_getc(&(obj->obj), ch, fkey, &result));
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}
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dlg_mouse_free_regions();
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return result;
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}
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