home *** CD-ROM | disk | FTP | other *** search
- /*
- * Copyright (c) 1984,1985,1989,1994 Mark Nudelman
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice in the documentation and/or other materials provided with
- * the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
- * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
- * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
- * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
- * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-
- /*
- * Functions which manipulate the command buffer.
- * Used only by command() and related functions.
- */
-
- #include "less.h"
- #include "cmd.h"
-
- extern int sc_width;
-
- static char cmdbuf[120]; /* Buffer for holding a multi-char command */
- static int cmd_col; /* Current column of the multi-char command */
- static char *cp; /* Pointer into cmdbuf */
- static int literal;
-
- #if TAB_COMPLETE_FILENAME
- static int cmd_complete();
- /*
- * These variables are statics used by cmd_complete.
- */
- static int in_completion = 0;
- static char *tk_text;
- static char *tk_original;
- static char *tk_ipoint;
- static char *tk_trial;
- static struct textlist tk_tlist;
- #endif
-
- #if CMD_HISTORY
- /*
- * A mlist structure represents a command history.
- */
- struct mlist
- {
- struct mlist *next;
- struct mlist *prev;
- struct mlist *curr_mp;
- char *string;
- };
-
- /*
- * These are the various command histories that exist.
- */
- struct mlist mlist_search =
- { &mlist_search, &mlist_search, &mlist_search, NULL };
- public void *ml_search = (void *) &mlist_search;
- struct mlist mlist_examine =
- { &mlist_examine, &mlist_examine, &mlist_examine, NULL };
- public void *ml_examine = (void *) &mlist_examine;
- #if SHELL_ESCAPE || PIPEC
- struct mlist mlist_shell =
- { &mlist_shell, &mlist_shell, &mlist_shell, NULL };
- public void *ml_shell = (void *) &mlist_shell;
- #endif /* SHELL_ESCAPE || PIPEC */
-
- /*
- * History for the current command.
- */
- static struct mlist *curr_mlist = NULL;
-
- #endif /* CMD_HISTORY */
-
- /*
- * Reset command buffer (to empty).
- */
- public void
- cmd_reset()
- {
- cp = cmdbuf;
- *cp = '\0';
- cmd_col = 0;
- literal = 0;
- }
-
- /*
- * How many characters are in the command buffer?
- */
- public int
- len_cmdbuf()
- {
- return (strlen(cmdbuf));
- }
-
- /*
- * Backspace in the command buffer.
- * Delete the char to the left of the cursor.
- */
- static int
- cmd_erase()
- {
- register char *s;
- char *p;
- int col;
-
- if (cp == cmdbuf)
- {
- /*
- * Backspace past beginning of the buffer:
- * this usually means abort the command.
- */
- return (CC_QUIT);
- }
- /*
- * Back up the pointer.
- */
- --cp;
- /*
- * Remember the current cursor column and
- * set it back the width of the char being erased.
- */
- col = cmd_col;
- p = prchar(*cp);
- cmd_col -= strlen(p);
- /*
- * Shift left the buffer after the erased char.
- */
- for (s = cp; *s != '\0'; s++)
- s[0] = s[1];
- /*
- * Back up the cursor to the position of the erased char,
- * clear the tail of the line,
- * and reprint the line after the erased char.
- */
- while (col > cmd_col)
- {
- putbs();
- col--;
- }
- clear_eol();
- for (s = cp; *s != '\0'; s++)
- {
- p = prchar(*s);
- putstr(p);
- col += strlen(p);
- }
- /*
- * Back up the cursor again.
- */
- while (col > cmd_col)
- {
- putbs();
- col--;
- }
-
- /*
- * This is rather weird.
- * We say that erasing the entire command string causes us
- * to abort the current command, BUT ONLY IF there is no history
- * for this type of command. This causes commands like search (/)
- * and edit (:e) to stay active even if we erase the entire string,
- * but commands like <digit> and - go away when we erase the string.
- * (See same thing in cmd_kill.)
- */
- if (curr_mlist == NULL && cp == cmdbuf && *cp == '\0')
- return (CC_QUIT);
- return (CC_OK);
- }
-
- /*
- * Delete the char under the cursor.
- */
- static int
- cmd_delete()
- {
- char *p;
-
- if (*cp == '\0')
- {
- /*
- * At end of string; there is no char under the cursor.
- */
- return (CC_OK);
- }
- /*
- * Move right, then use cmd_erase.
- */
- p = prchar(*cp);
- cp++;
- putstr(p);
- cmd_col += strlen(p);
- cmd_erase();
- return (CC_OK);
- }
-
- /*
- * Delete the "word" to the left of the cursor.
- */
- static int
- cmd_werase()
- {
- if (cp > cmdbuf && cp[-1] == ' ')
- {
- /*
- * If the char left of cursor is a space,
- * erase all the spaces left of cursor (to the first non-space).
- */
- while (cp > cmdbuf && cp[-1] == ' ')
- (void) cmd_erase();
- } else
- {
- /*
- * If the char left of cursor is not a space,
- * erase all the nonspaces left of cursor (the whole "word").
- */
- while (cp > cmdbuf && cp[-1] != ' ')
- (void) cmd_erase();
- }
- return (CC_OK);
- }
-
- /*
- * Delete the "word" under the cursor.
- */
- static int
- cmd_wdelete()
- {
- if (*cp == ' ')
- {
- /*
- * If the char under the cursor is a space,
- * delete it and all the spaces right of cursor.
- */
- while (*cp == ' ')
- (void) cmd_delete();
- } else
- {
- /*
- * If the char under the cursor is not a space,
- * delete it and all nonspaces right of cursor (the whole word).
- */
- while (*cp != ' ' && *cp != '\0')
- (void) cmd_delete();
- }
- return (CC_OK);
- }
-
- /*
- * Move cursor to start of command buffer.
- */
- static int
- cmd_home()
- {
- char *p;
-
- /*
- * Back up until we hit start of buffer.
- */
- while (cp > cmdbuf)
- {
- cp--;
- p = prchar(*cp);
- cmd_col -= strlen(p);
- while (*p++ != '\0')
- putbs();
- }
- return (CC_OK);
- }
-
- /*
- * Delete all chars in the command buffer.
- */
- static int
- cmd_kill()
- {
- if (cmdbuf[0] == '\0')
- {
- /*
- * Buffer is already empty; abort the current command.
- */
- return (CC_QUIT);
- }
- (void) cmd_home();
- *cp = '\0';
- clear_eol();
- /*
- * Same weirdness as in cmd_erase.
- * If the current command has no history, abort the current command.
- */
- if (curr_mlist == NULL)
- return (CC_QUIT);
- return (CC_OK);
- }
-
- /*
- * Move cursor right one character.
- */
- static int
- cmd_right()
- {
- char *p;
-
- if (*cp == '\0')
- {
- /*
- * Already at the end of the line.
- */
- return (CC_OK);
- }
- p = prchar(*cp);
- cp++;
- putstr(p);
- cmd_col += strlen(p);
- return (CC_OK);
- }
-
- /*
- * Move cursor left one character.
- */
- static int
- cmd_left()
- {
- char *p;
-
- if (cp <= cmdbuf)
- {
- /* Already at the beginning of the line */
- return (CC_OK);
- }
- cp--;
- p = prchar(*cp);
- cmd_col -= strlen(p);
- while (*p++ != '\0')
- putbs();
- return (CC_OK);
- }
-
- #if CMD_HISTORY
- /*
- * Select an mlist structure to be the current command history.
- */
- public void
- set_mlist(mlist)
- void *mlist;
- {
- curr_mlist = (struct mlist *) mlist;
- }
-
- /*
- * Move up or down in the currently selected command history list.
- */
- static int
- cmd_updown(action)
- int action;
- {
- char *p;
- char *s;
-
- if (curr_mlist == NULL)
- {
- /*
- * The current command has no history list.
- */
- bell();
- return (CC_OK);
- }
- cmd_home();
- clear_eol();
- /*
- * Move curr_mp to the next/prev entry.
- */
- if (action == EC_UP)
- curr_mlist->curr_mp = curr_mlist->curr_mp->prev;
- else
- curr_mlist->curr_mp = curr_mlist->curr_mp->next;
- /*
- * Copy the entry into cmdbuf and echo it on the screen.
- */
- s = curr_mlist->curr_mp->string;
- if (s == NULL)
- s = "";
- for (cp = cmdbuf; *s != '\0'; s++, cp++)
- {
- *cp = *s;
- p = prchar(*cp);
- cmd_col += strlen(p);
- putstr(p);
- }
- *cp = '\0';
- return (CC_OK);
- }
-
- /*
- * Accept the command in the command buffer.
- * Add it to the currently selected history list.
- */
- public void
- cmd_accept()
- {
- struct mlist *ml;
-
- /*
- * Nothing to do if there is no currently selected history list.
- */
- if (curr_mlist == NULL)
- return;
- /*
- * Don't save a trivial command.
- */
- if (strlen(cmdbuf) == 0)
- return;
- /*
- * Don't save if a duplicate of a command which is already in the history.
- * But select the one already in the history to be current.
- */
- for (ml = curr_mlist->next; ml != curr_mlist; ml = ml->next)
- {
- if (strcmp(ml->string, cmdbuf) == 0)
- break;
- }
- if (ml == curr_mlist)
- {
- /*
- * Did not find command in history.
- * Save the command and put it at the end of the history list.
- */
- ml = (struct mlist *) ecalloc(1, sizeof(struct mlist));
- ml->string = save(cmdbuf);
- ml->next = curr_mlist;
- ml->prev = curr_mlist->prev;
- curr_mlist->prev->next = ml;
- curr_mlist->prev = ml;
- }
- /*
- * Point to the cmd just after the just-accepted command.
- * Thus, an UPARROW will always retrieve the previous command.
- */
- curr_mlist->curr_mp = ml->next;
- }
- #endif
-
- /*
- * Try to perform a line-edit function on the command buffer,
- * using a specified char as a line-editing command.
- * Returns:
- * CC_PASS The char does not invoke a line edit function.
- * CC_OK Line edit function done.
- * CC_QUIT The char requests the current command to be aborted.
- */
- static int
- cmd_edit(c)
- int c;
- {
- int action;
- int flags;
-
- #if TAB_COMPLETE_FILENAME
- #define not_in_completion() in_completion = 0
- #else
- #define not_in_completion()
- #endif
-
- /*
- * See if the char is indeed a line-editing command.
- */
- flags = 0;
- if (curr_mlist == NULL)
- /*
- * No current history; don't accept history manipulation cmds.
- */
- flags |= EC_NOHISTORY;
- if (curr_mlist == &mlist_search)
- /*
- * In a search command; don't accept file-completion cmds.
- */
- flags |= EC_NOCOMPLETE;
-
- action = editchar(c, flags);
-
- switch (action)
- {
- case EC_RIGHT:
- not_in_completion();
- return (cmd_right());
- case EC_LEFT:
- not_in_completion();
- return (cmd_left());
- case EC_W_RIGHT:
- not_in_completion();
- while (*cp != '\0' && *cp != ' ')
- cmd_right();
- while (*cp == ' ')
- cmd_right();
- return (CC_OK);
- case EC_W_LEFT:
- not_in_completion();
- while (cp > cmdbuf && cp[-1] == ' ')
- cmd_left();
- while (cp > cmdbuf && cp[-1] != ' ')
- cmd_left();
- return (CC_OK);
- case EC_HOME:
- not_in_completion();
- return (cmd_home());
- case EC_END:
- not_in_completion();
- while (*cp != '\0')
- cmd_right();
- return (CC_OK);
- case EC_INSERT:
- not_in_completion();
- return (CC_OK);
- case EC_BACKSPACE:
- not_in_completion();
- return (cmd_erase());
- case EC_LINEKILL:
- not_in_completion();
- return (cmd_kill());
- case EC_W_BACKSPACE:
- not_in_completion();
- return (cmd_werase());
- case EC_DELETE:
- not_in_completion();
- return (cmd_delete());
- case EC_W_DELETE:
- not_in_completion();
- return (cmd_wdelete());
- case EC_LITERAL:
- literal = 1;
- return (CC_OK);
- #if CMD_HISTORY
- case EC_UP:
- case EC_DOWN:
- not_in_completion();
- return (cmd_updown(action));
- #endif
- #if TAB_COMPLETE_FILENAME
- case EC_F_COMPLETE:
- case EC_B_COMPLETE:
- case EC_EXPAND:
- return (cmd_complete(action));
- #endif
- default:
- not_in_completion();
- return (CC_PASS);
- }
- }
-
- /*
- * Insert a char into the command buffer, at the current position.
- */
- static int
- cmd_ichar(c)
- int c;
- {
- int col;
- char *p;
- char *s;
-
- if (strlen(cmdbuf) >= sizeof(cmdbuf)-2)
- {
- /*
- * No room in the command buffer for another char.
- */
- bell();
- return (CC_ERROR);
- }
-
- /*
- * Remember the current cursor column and
- * move it forward the width of the char being inserted.
- */
- col = cmd_col;
- p = prchar(c);
- cmd_col += strlen(p);
- if (cmd_col >= sc_width-1)
- {
- cmd_col -= strlen(p);
- bell();
- return (CC_ERROR);
- }
- /*
- * Insert the character in the string.
- * First, make room for the new char.
- */
- for (s = &cmdbuf[strlen(cmdbuf)]; s >= cp; s--)
- s[1] = s[0];
- *cp++ = c;
- /*
- * Reprint the tail of the line after the inserted char.
- */
- clear_eol();
- for (s = cp-1; *s != '\0'; s++)
- {
- p = prchar(*s);
- col += strlen(p);
- if (col >= sc_width-1)
- {
- /*
- * Oops. There is no room on the screen
- * for the new char. Back up the cursor to
- * just after the inserted char and erase it.
- */
- col -= strlen(p);
- while (col > cmd_col)
- {
- putbs();
- col--;
- }
- (void) cmd_erase();
- bell();
- return (CC_ERROR);
- }
- putstr(p);
- }
- /*
- * Back up the cursor to just after the inserted char.
- */
- while (col > cmd_col)
- {
- putbs();
- col--;
- }
- return (CC_OK);
- }
-
- #if TAB_COMPLETE_FILENAME
- /*
- * Insert a string into the command buffer, at the current position.
- */
- static int
- cmd_istr(str)
- char *str;
- {
- char *s;
- int action;
-
- for (s = str; *s != '\0'; s++)
- {
- action = cmd_ichar(*s);
- if (action != CC_OK)
- {
- bell();
- return (action);
- }
- }
- return (CC_OK);
- }
-
- /*
- * Find the beginning and end of the "current" word.
- * This is the word which the cursor (cp) is inside or at the end of.
- * Return pointer to the beginning of the word and put the
- * cursor at the end of the word.
- */
- static char *
- delimit_word()
- {
- char *word;
-
- /*
- * Move cursor to end of word.
- */
- if (*cp != ' ' && *cp != '\0')
- {
- /*
- * Cursor is on a nonspace.
- * Move cursor right to the next space.
- */
- while (*cp != ' ' && *cp != '\0')
- cmd_right();
- } else if (cp > cmdbuf && cp[-1] != ' ')
- {
- /*
- * Cursor is on a space, and char to the left is a nonspace.
- * We're already at the end of the word.
- */
- ;
- } else
- {
- /*
- * Cursor is on a space and char to the left is a space.
- * Huh? There's no word here.
- */
- return (NULL);
- }
- /*
- * Search backwards for beginning of the word.
- */
- if (cp == cmdbuf)
- return (NULL);
- for (word = cp-1; word > cmdbuf; word--)
- if (word[-1] == ' ')
- break;
- return (word);
- }
-
- /*
- * Set things up to enter completion mode.
- * Expand the word under the cursor into a list of filenames
- * which start with that word, and set tk_text to that list.
- */
- static void
- init_compl()
- {
- char *word;
- char c;
-
- /*
- * Get rid of any previous tk_text.
- */
- if (tk_text != NULL)
- {
- free(tk_text);
- tk_text = NULL;
- }
- /*
- * Find the original (uncompleted) word in the command buffer.
- */
- word = delimit_word();
- if (word == NULL)
- return;
- /*
- * Set the insertion point to the point in the command buffer
- * where the original (uncompleted) word now sits.
- */
- tk_ipoint = word;
- /*
- * Save the original (uncompleted) word
- */
- if (tk_original != NULL)
- free(tk_original);
- tk_original = (char *) ecalloc(cp-word+1, sizeof(char));
- strncpy(tk_original, word, cp-word);
- /*
- * Get the expanded filename.
- * This may result in a single filename, or
- * a blank-separated list of filenames.
- */
- c = *cp;
- *cp = '\0';
- tk_text = fcomplete(word);
- *cp = c;
- }
-
- /*
- * Return the next word in the current completion list.
- */
- static char *
- next_compl(action, prev)
- int action;
- char *prev;
- {
- switch (action)
- {
- case EC_F_COMPLETE:
- return (forw_textlist(&tk_tlist, prev));
- case EC_B_COMPLETE:
- return (back_textlist(&tk_tlist, prev));
- default:
- /* Cannot happen */
- return ("?");
- }
- }
-
- /*
- * Complete the filename before (or under) the cursor.
- * cmd_complete may be called multiple times. The global in_completion
- * remembers whether this call is the first time (create the list),
- * or a subsequent time (step thru the list).
- */
- static int
- cmd_complete(action)
- int action;
- {
-
- if (!in_completion || action == EC_EXPAND)
- {
- /*
- * Expand the word under the cursor and
- * use the first word in the expansion
- * (or the entire expansion if we're doing EC_EXPAND).
- */
- init_compl();
- if (tk_text == NULL)
- {
- bell();
- return (CC_OK);
- }
- if (action == EC_EXPAND)
- {
- /*
- * Use the whole list.
- */
- tk_trial = tk_text;
- } else
- {
- /*
- * Use the first filename in the list.
- */
- in_completion = 1;
- init_textlist(&tk_tlist, tk_text);
- tk_trial = next_compl(action, (char*)NULL);
- }
- } else
- {
- /*
- * We already have a completion list.
- * Use the next/previous filename from the list.
- */
- tk_trial = next_compl(action, tk_trial);
- }
-
- /*
- * Remove the original word, or the previous trial completion.
- */
- while (cp > tk_ipoint)
- (void) cmd_erase();
-
- if (tk_trial == NULL)
- {
- /*
- * There are no more trial completions.
- * Insert the original (uncompleted) filename.
- */
- in_completion = 0;
- if (cmd_istr(tk_original) != CC_OK)
- goto fail;
- } else
- {
- /*
- * Insert trial completion.
- */
- if (cmd_istr(tk_trial) != CC_OK)
- goto fail;
- }
-
- return (CC_OK);
-
- fail:
- in_completion = 0;
- bell();
- return (CC_OK);
- }
-
- #endif /* TAB_COMPLETE_FILENAME */
-
- /*
- * Process a single character of a multi-character command, such as
- * a number, or the pattern of a search command.
- * Returns:
- * CC_OK The char was accepted.
- * CC_QUIT The char requests the command to be aborted.
- * CC_ERROR The char could not be accepted due to an error.
- */
- public int
- cmd_char(c)
- int c;
- {
- int action;
-
- if (literal)
- {
- /*
- * Insert the char, even if it is a line-editing char.
- */
- literal = 0;
- return (cmd_ichar(c));
- }
-
- /*
- * See if it is a special line-editing character.
- */
- if (in_mca())
- {
- action = cmd_edit(c);
- switch (action)
- {
- case CC_OK:
- case CC_QUIT:
- return (action);
- case CC_PASS:
- break;
- }
- }
-
- /*
- * Insert the char into the command buffer.
- */
- action = cmd_ichar(c);
- if (action != CC_OK)
- return (action);
- return (CC_OK);
- }
-
- /*
- * Return the number currently in the command buffer.
- */
- public int
- cmd_int()
- {
- return (atoi(cmdbuf));
- }
-
- /*
- * Display a string, usually as a prompt for input into the command buffer.
- */
- public void
- cmd_putstr(s)
- char *s;
- {
- putstr(s);
- cmd_col += strlen(s);
- }
-
- /*
- * Return a pointer to the command buffer.
- */
- public char *
- get_cmdbuf()
- {
- return (cmdbuf);
- }
-