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histedit.c

/*    $NetBSD: histedit.c,v 1.36 2005/05/09 11:35:19 christos Exp $     */

/*-
 * Copyright (c) 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * 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, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 */

#ifdef HAVE_SYS_CDEFS_H
#include <sys/cdefs.h>
#endif
#ifndef lint
#if 0
static char sccsid[] = "@(#)histedit.c    8.2 (Berkeley) 5/4/95";
#else
__RCSID("$NetBSD: histedit.c,v 1.36 2005/05/09 11:35:19 christos Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#ifndef __sun__
#include <paths.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
/*
 * Editline and history functions (and glue).
 */
#include "shell.h"
#include "parser.h"
#include "var.h"
#include "options.h"
#include "main.h"
#include "output.h"
#include "mystring.h"
#include "myhistedit.h"
#include "error.h"
#ifndef SMALL
#include "eval.h"
#include "memalloc.h"

#define MAXHISTLOOPS    4     /* max recursions through fc */
#define DEFEDITOR "ed"  /* default editor *should* be $EDITOR */

History *hist;    /* history cookie */
EditLine *el;     /* editline cookie */
int displayhist;
static FILE *el_in, *el_out;
unsigned char _el_fn_complete(EditLine *, int);

STATIC const char *fc_replace(const char *, char *, char *);

#ifdef DEBUG
extern FILE *tracefile;
#endif

/*
 * Set history and editing status.  Called whenever the status may
 * have changed (figures out what to do).
 */
void
histedit(void)
{
      FILE *el_err;

#define editing (Eflag || Vflag)

      if (iflag) {
            if (!hist) {
                  /*
                   * turn history on
                   */
                  INTOFF;
                  hist = history_init();
                  INTON;

                  if (hist != NULL)
                        sethistsize(histsizeval());
                  else
                        out2str("sh: can't initialize history\n");
            }
            if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
                  /*
                   * turn editing on
                   */
                  char *term, *shname;

                  INTOFF;
                  if (el_in == NULL)
                        el_in = fdopen(0, "r");
                  if (el_out == NULL)
                        el_out = fdopen(2, "w");
                  if (el_in == NULL || el_out == NULL)
                        goto bad;
                  el_err = el_out;
#if DEBUG
                  if (tracefile)
                        el_err = tracefile;
#endif
                  term = lookupvar("TERM");
                  if (term)
                        setenv("TERM", term, 1);
                  else
                        unsetenv("TERM");
                  shname = arg0;
                  if (shname[0] == '-')
                        shname++;
                  el = el_init(shname, el_in, el_out, el_err);
                  if (el != NULL) {
                        if (hist)
                              el_set(el, EL_HIST, history, hist);
                        el_set(el, EL_PROMPT, getprompt);
                        el_set(el, EL_SIGNAL, 1);
                        el_set(el, EL_ADDFN, "rl-complete",
                            "ReadLine compatible completion function",
                            _el_fn_complete);
                  } else {
bad:
                        out2str("sh: can't initialize editing\n");
                  }
                  INTON;
            } else if (!editing && el) {
                  INTOFF;
                  el_end(el);
                  el = NULL;
                  INTON;
            }
            if (el) {
                  if (Vflag)
                        el_set(el, EL_EDITOR, "vi");
                  else if (Eflag)
                        el_set(el, EL_EDITOR, "emacs");
                  el_set(el, EL_BIND, "^I",
                      tabcomplete ? "rl-complete" : "ed-insert", NULL);
                  el_source(el, NULL);
            }
      } else {
            INTOFF;
            if (el) {   /* no editing if not interactive */
                  el_end(el);
                  el = NULL;
            }
            if (hist) {
                  history_end(hist);
                  hist = NULL;
            }
            INTON;
      }
}


void
sethistsize(const char *hs)
{
      int histsize;
      HistEvent he;

      if (hist != NULL) {
            if (hs == NULL || *hs == '\0' ||
               (histsize = atoi(hs)) < 0)
                  histsize = 100;
            history(hist, &he, H_SETSIZE, histsize);
      }
}

void
setterm(const char *term)
{
      if (el != NULL && term != NULL)
            if (el_set(el, EL_TERMINAL, term) != 0) {
                  outfmt(out2, "sh: Can't set terminal type %s\n", term);
                  outfmt(out2, "sh: Using dumb terminal settings.\n");
            }
}

int
inputrc(argc, argv)
      int argc;
      char **argv;
{
      if (argc != 2) {
            out2str("usage: inputrc file\n");
            return 1;
      }
      if (el != NULL) {
            if (el_source(el, argv[1])) {
                  out2str("inputrc: failed\n");
                  return 1;
            } else
                  return 0;
      } else {
            out2str("sh: inputrc ignored, not editing\n");
            return 1;
      }
}

/*
 *  This command is provided since POSIX decided to standardize
 *  the Korn shell fc command.  Oh well...
 */
int
histcmd(int argc, char **argv)
{
      int ch;
      const char *editor = NULL;
      HistEvent he;
      int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
      int i, retval;
      const char *firststr, *laststr;
      int first, last, direction;
      char *pat = NULL, *repl;      /* ksh "fc old=new" crap */
      static int active = 0;
      struct jmploc jmploc;
      struct jmploc *volatile savehandler;
      char editfile[MAXPATHLEN + 1];
      FILE *efp;
#ifdef __GNUC__
      /* Avoid longjmp clobbering */
      (void) &editor;
      (void) &lflg;
      (void) &nflg;
      (void) &rflg;
      (void) &sflg;
      (void) &firststr;
      (void) &laststr;
      (void) &pat;
      (void) &repl;
      (void) &efp;
      (void) &argc;
      (void) &argv;
#endif

      if (hist == NULL)
            error("history not active");

      if (argc == 1)
            error("missing history argument");

      optreset = 1; optind = 1; /* initialize getopt */
      while (not_fcnumber(argv[optind]) &&
            (ch = getopt(argc, argv, ":e:lnrs")) != -1)
            switch ((char)ch) {
            case 'e':
                  editor = optionarg;
                  break;
            case 'l':
                  lflg = 1;
                  break;
            case 'n':
                  nflg = 1;
                  break;
            case 'r':
                  rflg = 1;
                  break;
            case 's':
                  sflg = 1;
                  break;
            case ':':
                  error("option -%c expects argument", optopt);
                  /* NOTREACHED */
            case '?':
            default:
                  error("unknown option: -%c", optopt);
                  /* NOTREACHED */
            }
      argc -= optind, argv += optind;

      /*
       * If executing...
       */
      if (lflg == 0 || editor || sflg) {
            lflg = 0;   /* ignore */
            editfile[0] = '\0';
            /*
             * Catch interrupts to reset active counter and
             * cleanup temp files.
             */
            if (setjmp(jmploc.loc)) {
                  active = 0;
                  if (*editfile)
                        unlink(editfile);
                  handler = savehandler;
                  longjmp(handler->loc, 1);
            }
            savehandler = handler;
            handler = &jmploc;
            if (++active > MAXHISTLOOPS) {
                  active = 0;
                  displayhist = 0;
                  error("called recursively too many times");
            }
            /*
             * Set editor.
             */
            if (sflg == 0) {
                  if (editor == NULL &&
                      (editor = bltinlookup("FCEDIT", 1)) == NULL &&
                      (editor = bltinlookup("EDITOR", 1)) == NULL)
                        editor = DEFEDITOR;
                  if (editor[0] == '-' && editor[1] == '\0') {
                        sflg = 1;   /* no edit */
                        editor = NULL;
                  }
            }
      }

      /*
       * If executing, parse [old=new] now
       */
      if (lflg == 0 && argc > 0 &&
           ((repl = strchr(argv[0], '=')) != NULL)) {
            pat = argv[0];
            *repl++ = '\0';
            argc--, argv++;
      }
      /*
       * determine [first] and [last]
       */
      switch (argc) {
      case 0:
            firststr = lflg ? "-16" : "-1";
            laststr = "-1";
            break;
      case 1:
            firststr = argv[0];
            laststr = lflg ? "-1" : argv[0];
            break;
      case 2:
            firststr = argv[0];
            laststr = argv[1];
            break;
      default:
            error("too many args");
            /* NOTREACHED */
      }
      /*
       * Turn into event numbers.
       */
      first = str_to_event(firststr, 0);
      last = str_to_event(laststr, 1);

      if (rflg) {
            i = last;
            last = first;
            first = i;
      }
      /*
       * XXX - this should not depend on the event numbers
       * always increasing.  Add sequence numbers or offset
       * to the history element in next (diskbased) release.
       */
      direction = first < last ? H_PREV : H_NEXT;

      /*
       * If editing, grab a temp file.
       */
      if (editor) {
            int fd;
            INTOFF;           /* easier */
            snprintf(editfile, sizeof(editfile), "%s_shXXXXXX", _PATH_TMP);
            if ((fd = mkstemp(editfile)) < 0)
                  error("can't create temporary file %s", editfile);
            if ((efp = fdopen(fd, "w")) == NULL) {
                  close(fd);
                  error("can't allocate stdio buffer for temp");
            }
      }

      /*
       * Loop through selected history events.  If listing or executing,
       * do it now.  Otherwise, put into temp file and call the editor
       * after.
       *
       * The history interface needs rethinking, as the following
       * convolutions will demonstrate.
       */
      history(hist, &he, H_FIRST);
      retval = history(hist, &he, H_NEXT_EVENT, first);
      for (;retval != -1; retval = history(hist, &he, direction)) {
            if (lflg) {
                  if (!nflg)
                        out1fmt("%5d ", he.num);
                  out1str(he.str);
            } else {
                  const char *s = pat ?
                     fc_replace(he.str, pat, repl) : he.str;

                  if (sflg) {
                        if (displayhist) {
                              out2str(s);
                        }

                        evalstring(strcpy(stalloc(strlen(s) + 1), s), 0);
                        if (displayhist && hist) {
                              /*
                               *  XXX what about recursive and
                               *  relative histnums.
                               */
                              history(hist, &he, H_ENTER, s);
                        }
                  } else
                        fputs(s, efp);
            }
            /*
             * At end?  (if we were to lose last, we'd sure be
             * messed up).
             */
            if (he.num == last)
                  break;
      }
      if (editor) {
            char *editcmd;

            fclose(efp);
            editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
            sprintf(editcmd, "%s %s", editor, editfile);
            evalstring(editcmd, 0); /* XXX - should use no JC command */
            INTON;
            readcmdfile(editfile);  /* XXX - should read back - quick tst */
            unlink(editfile);
      }

      if (lflg == 0 && active > 0)
            --active;
      if (displayhist)
            displayhist = 0;
      return 0;
}

STATIC const char *
fc_replace(const char *s, char *p, char *r)
{
      char *dest;
      int plen = strlen(p);

      STARTSTACKSTR(dest);
      while (*s) {
            if (*s == *p && strncmp(s, p, plen) == 0) {
                  while (*r)
                        STPUTC(*r++, dest);
                  s += plen;
                  *p = '\0';  /* so no more matches */
            } else
                  STPUTC(*s++, dest);
      }
      STACKSTRNUL(dest);
      dest = grabstackstr(dest);

      return (dest);
}

int
not_fcnumber(char *s)
{
      if (s == NULL)
            return 0;
        if (*s == '-')
                s++;
      return (!is_number(s));
}

int
str_to_event(const char *str, int last)
{
      HistEvent he;
      const char *s = str;
      int relative = 0;
      int i, retval;

      retval = history(hist, &he, H_FIRST);
      switch (*s) {
      case '-':
            relative = 1;
            /*FALLTHROUGH*/
      case '+':
            s++;
      }
      if (is_number(s)) {
            i = atoi(s);
            if (relative) {
                  while (retval != -1 && i--) {
                        retval = history(hist, &he, H_NEXT);
                  }
                  if (retval == -1)
                        retval = history(hist, &he, H_LAST);
            } else {
                  retval = history(hist, &he, H_NEXT_EVENT, i);
                  if (retval == -1) {
                        /*
                         * the notion of first and last is
                         * backwards to that of the history package
                         */
                        retval = history(hist, &he,
                                    last ? H_FIRST : H_LAST);
                  }
            }
            if (retval == -1)
                  error("history number %s not found (internal error)",
                         str);
      } else {
            /*
             * pattern
             */
            retval = history(hist, &he, H_PREV_STR, str);
            if (retval == -1)
                  error("history pattern not found: %s", str);
      }
      return (he.num);
}
#else
int
histcmd(int argc, char **argv)
{
      error("not compiled with history support");
      /* NOTREACHED */
}
int
inputrc(int argc, char **argv)
{
      error("not compiled with history support");
      /* NOTREACHED */
}
#endif

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