/* $OpenBSD$ */

/*
* Copyright (c) 2009 Jonathan Alvarado <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, 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.
*/

#include <sys/types.h>

#include <stdlib.h>
#include <string.h>

#include "tmux.h"

/*
* Write the entire contents of a pane to a buffer or stdout.
*/

static enum cmd_retval  cmd_capture_pane_exec(struct cmd *, struct cmdq_item *);

static char     *cmd_capture_pane_append(char *, size_t *, char *, size_t);
static char     *cmd_capture_pane_pending(struct args *, struct window_pane *,
                    size_t *);
static char     *cmd_capture_pane_history(struct args *, struct cmdq_item *,
                    struct window_pane *, size_t *);

const struct cmd_entry cmd_capture_pane_entry = {
       .name = "capture-pane",
       .alias = "capturep",

       .args = { "ab:CeE:JNpPqS:Tt:", 0, 0, NULL },
       .usage = "[-aCeJNpPqT] " CMD_BUFFER_USAGE " [-E end-line] "
                "[-S start-line] " CMD_TARGET_PANE_USAGE,

       .target = { 't', CMD_FIND_PANE, 0 },

       .flags = CMD_AFTERHOOK,
       .exec = cmd_capture_pane_exec
};

const struct cmd_entry cmd_clear_history_entry = {
       .name = "clear-history",
       .alias = "clearhist",

       .args = { "Ht:", 0, 0, NULL },
       .usage = "[-H] " CMD_TARGET_PANE_USAGE,

       .target = { 't', CMD_FIND_PANE, 0 },

       .flags = CMD_AFTERHOOK,
       .exec = cmd_capture_pane_exec
};

static char *
cmd_capture_pane_append(char *buf, size_t *len, char *line, size_t linelen)
{
       buf = xrealloc(buf, *len + linelen + 1);
       memcpy(buf + *len, line, linelen);
       *len += linelen;
       return (buf);
}

static char *
cmd_capture_pane_pending(struct args *args, struct window_pane *wp,
   size_t *len)
{
       struct evbuffer *pending;
       char            *buf, *line, tmp[5];
       size_t           linelen;
       u_int            i;

       pending = input_pending(wp->ictx);
       if (pending == NULL)
               return (xstrdup(""));

       line = (char *)EVBUFFER_DATA(pending);
       linelen = EVBUFFER_LENGTH(pending);

       buf = xstrdup("");
       if (args_has(args, 'C')) {
               for (i = 0; i < linelen; i++) {
                       if (line[i] >= ' ' && line[i] != '\\') {
                               tmp[0] = line[i];
                               tmp[1] = '\0';
                       } else
                               xsnprintf(tmp, sizeof tmp, "\\%03hho", line[i]);
                       buf = cmd_capture_pane_append(buf, len, tmp,
                           strlen(tmp));
               }
       } else
               buf = cmd_capture_pane_append(buf, len, line, linelen);
       return (buf);
}

static char *
cmd_capture_pane_history(struct args *args, struct cmdq_item *item,
   struct window_pane *wp, size_t *len)
{
       struct grid             *gd;
       const struct grid_line  *gl;
       struct grid_cell        *gc = NULL;
       int                      n, join_lines, flags = 0;
       u_int                    i, sx, top, bottom, tmp;
       char                    *cause, *buf, *line;
       const char              *Sflag, *Eflag;
       size_t                   linelen;

       sx = screen_size_x(&wp->base);
       if (args_has(args, 'a')) {
               gd = wp->base.saved_grid;
               if (gd == NULL) {
                       if (!args_has(args, 'q')) {
                               cmdq_error(item, "no alternate screen");
                               return (NULL);
                       }
                       return (xstrdup(""));
               }
       } else
               gd = wp->base.grid;

       Sflag = args_get(args, 'S');
       if (Sflag != NULL && strcmp(Sflag, "-") == 0)
               top = 0;
       else {
               n = args_strtonum_and_expand(args, 'S', INT_MIN, SHRT_MAX,
                       item, &cause);
               if (cause != NULL) {
                       top = gd->hsize;
                       free(cause);
               } else if (n < 0 && (u_int) -n > gd->hsize)
                       top = 0;
               else
                       top = gd->hsize + n;
               if (top > gd->hsize + gd->sy - 1)
                       top = gd->hsize + gd->sy - 1;
       }

       Eflag = args_get(args, 'E');
       if (Eflag != NULL && strcmp(Eflag, "-") == 0)
               bottom = gd->hsize + gd->sy - 1;
       else {
               n = args_strtonum_and_expand(args, 'E', INT_MIN, SHRT_MAX,
                       item, &cause);
               if (cause != NULL) {
                       bottom = gd->hsize + gd->sy - 1;
                       free(cause);
               } else if (n < 0 && (u_int) -n > gd->hsize)
                       bottom = 0;
               else
                       bottom = gd->hsize + n;
               if (bottom > gd->hsize + gd->sy - 1)
                       bottom = gd->hsize + gd->sy - 1;
       }

       if (bottom < top) {
               tmp = bottom;
               bottom = top;
               top = tmp;
       }

       join_lines = args_has(args, 'J');
       if (args_has(args, 'e'))
               flags |= GRID_STRING_WITH_SEQUENCES;
       if (args_has(args, 'C'))
               flags |= GRID_STRING_ESCAPE_SEQUENCES;
       if (!join_lines && !args_has(args, 'T'))
               flags |= GRID_STRING_EMPTY_CELLS;
       if (!join_lines && !args_has(args, 'N'))
               flags |= GRID_STRING_TRIM_SPACES;

       buf = NULL;
       for (i = top; i <= bottom; i++) {
               line = grid_string_cells(gd, 0, i, sx, &gc, flags, wp->screen);
               linelen = strlen(line);

               buf = cmd_capture_pane_append(buf, len, line, linelen);

               gl = grid_peek_line(gd, i);
               if (!join_lines || !(gl->flags & GRID_LINE_WRAPPED))
                       buf[(*len)++] = '\n';

               free(line);
       }
       return (buf);
}

static enum cmd_retval
cmd_capture_pane_exec(struct cmd *self, struct cmdq_item *item)
{
       struct args             *args = cmd_get_args(self);
       struct client           *c = cmdq_get_client(item);
       struct window_pane      *wp = cmdq_get_target(item)->wp;
       char                    *buf, *cause;
       const char              *bufname;
       size_t                   len;

       if (cmd_get_entry(self) == &cmd_clear_history_entry) {
               window_pane_reset_mode_all(wp);
               grid_clear_history(wp->base.grid);
               if (args_has(args, 'H'))
                       screen_reset_hyperlinks(wp->screen);
               return (CMD_RETURN_NORMAL);
       }

       len = 0;
       if (args_has(args, 'P'))
               buf = cmd_capture_pane_pending(args, wp, &len);
       else
               buf = cmd_capture_pane_history(args, item, wp, &len);
       if (buf == NULL)
               return (CMD_RETURN_ERROR);

       if (args_has(args, 'p')) {
               if (len > 0 && buf[len - 1] == '\n')
                       len--;
               if (c->flags & CLIENT_CONTROL)
                       control_write(c, "%.*s", (int)len, buf);
               else {
                       if (!file_can_print(c)) {
                               cmdq_error(item, "can't write to client");
                               free(buf);
                               return (CMD_RETURN_ERROR);
                       }
                       file_print_buffer(c, buf, len);
                       file_print(c, "\n");
                       free(buf);
               }
       } else {
               bufname = NULL;
               if (args_has(args, 'b'))
                       bufname = args_get(args, 'b');

               if (paste_set(buf, len, bufname, &cause) != 0) {
                       cmdq_error(item, "%s", cause);
                       free(cause);
                       free(buf);
                       return (CMD_RETURN_ERROR);
               }
       }

       return (CMD_RETURN_NORMAL);
}

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