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+/* $Header: /p/tcsh/cvsroot/tcsh/tw.comp.c,v 1.41 2006/03/02 18:46:45 christos Exp $ */
+/*
+ * tw.comp.c: File completion builtin
+ */
+/*-
+ * Copyright (c) 1980, 1991 The Regents of the University of California.
+ * 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, 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.
+ */
+#include "sh.h"
+
+RCSID("$tcsh: tw.comp.c,v 1.41 2006/03/02 18:46:45 christos Exp $")
+
+#include "tw.h"
+#include "ed.h"
+#include "tc.h"
+
+/* #define TDEBUG */
+struct varent completions;
+
+static int tw_result (const Char *, Char **);
+static Char **tw_find (Char *, struct varent *, int);
+static Char *tw_tok (Char *);
+static int tw_pos (Char *, int);
+static void tw_pr (Char **);
+static int tw_match (const Char *, const Char *);
+static void tw_prlist (struct varent *);
+static const Char *tw_dollar (const Char *,Char **, size_t, Char **,
+ Char, const char *);
+
+/* docomplete():
+ * Add or list completions in the completion list
+ */
+/*ARGSUSED*/
+void
+docomplete(Char **v, struct command *t)
+{
+ struct varent *vp;
+ Char *p;
+ Char **pp;
+
+ USE(t);
+ v++;
+ p = *v++;
+ if (p == 0)
+ tw_prlist(&completions);
+ else if (*v == 0) {
+ vp = adrof1(strip(p), &completions);
+ if (vp && vp->vec)
+ tw_pr(vp->vec), xputchar('\n');
+ else
+ {
+#ifdef TDEBUG
+ xprintf("tw_find(%s) \n", short2str(strip(p)));
+#endif /* TDEBUG */
+ pp = tw_find(strip(p), &completions, FALSE);
+ if (pp)
+ tw_pr(pp), xputchar('\n');
+ }
+ }
+ else
+ set1(strip(p), saveblk(v), &completions, VAR_READWRITE);
+} /* end docomplete */
+
+
+/* douncomplete():
+ * Remove completions from the completion list
+ */
+/*ARGSUSED*/
+void
+douncomplete(Char **v, struct command *t)
+{
+ USE(t);
+ unset1(v, &completions);
+} /* end douncomplete */
+
+
+/* tw_prlist():
+ * Pretty print a list of variables
+ */
+static void
+tw_prlist(struct varent *p)
+{
+ struct varent *c;
+
+ for (;;) {
+ while (p->v_left)
+ p = p->v_left;
+x:
+ if (p->v_parent == 0) /* is it the header? */
+ break;
+ if (setintr) {
+ int old_pintr_disabled;
+
+ pintr_push_enable(&old_pintr_disabled);
+ cleanup_until(&old_pintr_disabled);
+ }
+ xprintf("%s\t", short2str(p->v_name));
+ if (p->vec)
+ tw_pr(p->vec);
+ xputchar('\n');
+ if (p->v_right) {
+ p = p->v_right;
+ continue;
+ }
+ do {
+ c = p;
+ p = p->v_parent;
+ } while (p->v_right == c);
+ goto x;
+ }
+} /* end tw_prlist */
+
+
+/* tw_pr():
+ * Pretty print a completion, adding single quotes around
+ * a completion argument and collapsing multiple spaces to one.
+ */
+static void
+tw_pr(Char **cmp)
+{
+ int sp, osp;
+ Char *ptr;
+
+ for (; *cmp; cmp++) {
+ xputchar('\'');
+ for (osp = 0, ptr = *cmp; *ptr; ptr++) {
+ sp = Isspace(*ptr);
+ if (sp && osp)
+ continue;
+ xputwchar(*ptr);
+ osp = sp;
+ }
+ xputchar('\'');
+ if (cmp[1])
+ xputchar(' ');
+ }
+} /* end tw_pr */
+
+
+/* tw_find():
+ * Find the first matching completion.
+ * For commands we only look at names that start with -
+ */
+static Char **
+tw_find(Char *nam, struct varent *vp, int cmd)
+{
+ Char **rv;
+
+ for (vp = vp->v_left; vp; vp = vp->v_right) {
+ if (vp->v_left && (rv = tw_find(nam, vp, cmd)) != NULL)
+ return rv;
+ if (cmd) {
+ if (vp->v_name[0] != '-')
+ continue;
+ if (Gmatch(nam, &vp->v_name[1]) && vp->vec != NULL)
+ return vp->vec;
+ }
+ else
+ if (Gmatch(nam, vp->v_name) && vp->vec != NULL)
+ return vp->vec;
+ }
+ return NULL;
+} /* end tw_find */
+
+
+/* tw_pos():
+ * Return true if the position is within the specified range
+ */
+static int
+tw_pos(Char *ran, int wno)
+{
+ Char *p;
+
+ if (ran[0] == '*' && ran[1] == '\0')
+ return 1;
+
+ for (p = ran; *p && *p != '-'; p++)
+ continue;
+
+ if (*p == '\0') /* range == <number> */
+ return wno == getn(ran);
+
+ if (ran == p) /* range = - <number> */
+ return wno <= getn(&ran[1]);
+ *p++ = '\0';
+
+ if (*p == '\0') /* range = <number> - */
+ return getn(ran) <= wno;
+ else /* range = <number> - <number> */
+ return (getn(ran) <= wno) && (wno <= getn(p));
+} /* end tw_pos */
+
+
+/* tw_tok():
+ * Return the next word from string, unquoteing it.
+ */
+static Char *
+tw_tok(Char *str)
+{
+ static Char *bf = NULL;
+
+ if (str != NULL)
+ bf = str;
+
+ /* skip leading spaces */
+ for (; *bf && Isspace(*bf); bf++)
+ continue;
+
+ for (str = bf; *bf && !Isspace(*bf); bf++) {
+ if (ismetahash(*bf))
+ return INVPTR;
+ *bf = *bf & ~QUOTE;
+ }
+ if (*bf != '\0')
+ *bf++ = '\0';
+
+ return *str ? str : NULL;
+} /* end tw_tok */
+
+
+/* tw_match():
+ * Match a string against the pattern given.
+ * and return the number of matched characters
+ * in a prefix of the string.
+ */
+static int
+tw_match(const Char *str, const Char *pat)
+{
+ const Char *estr;
+ int rv = Gnmatch(str, pat, &estr);
+#ifdef TDEBUG
+ xprintf("Gnmatch(%s, ", short2str(str));
+ xprintf("%s, ", short2str(pat));
+ xprintf("%s) = %d [%d]\n", short2str(estr), rv, estr - str);
+#endif /* TDEBUG */
+ return (int) (rv ? estr - str : -1);
+}
+
+
+/* tw_result():
+ * Return what the completion action should be depending on the
+ * string
+ */
+static int
+tw_result(const Char *act, Char **pat)
+{
+ int looking;
+ static Char* res = NULL;
+ Char *p;
+
+ if (res != NULL)
+ xfree(res), res = NULL;
+
+ switch (act[0] & ~QUOTE) {
+ case 'X':
+ looking = TW_COMPLETION;
+ break;
+ case 'S':
+ looking = TW_SIGNAL;
+ break;
+ case 'a':
+ looking = TW_ALIAS;
+ break;
+ case 'b':
+ looking = TW_BINDING;
+ break;
+ case 'c':
+ looking = TW_COMMAND;
+ break;
+ case 'C':
+ looking = TW_PATH | TW_COMMAND;
+ break;
+ case 'd':
+ looking = TW_DIRECTORY;
+ break;
+ case 'D':
+ looking = TW_PATH | TW_DIRECTORY;
+ break;
+ case 'e':
+ looking = TW_ENVVAR;
+ break;
+ case 'f':
+ looking = TW_FILE;
+ break;
+#ifdef COMPAT
+ case 'p':
+#endif /* COMPAT */
+ case 'F':
+ looking = TW_PATH | TW_FILE;
+ break;
+ case 'g':
+ looking = TW_GRPNAME;
+ break;
+ case 'j':
+ looking = TW_JOB;
+ break;
+ case 'l':
+ looking = TW_LIMIT;
+ break;
+ case 'n':
+ looking = TW_NONE;
+ break;
+ case 's':
+ looking = TW_SHELLVAR;
+ break;
+ case 't':
+ looking = TW_TEXT;
+ break;
+ case 'T':
+ looking = TW_PATH | TW_TEXT;
+ break;
+ case 'v':
+ looking = TW_VARIABLE;
+ break;
+ case 'u':
+ looking = TW_USER;
+ break;
+ case 'x':
+ looking = TW_EXPLAIN;
+ break;
+
+ case '$':
+ *pat = res = Strsave(&act[1]);
+ (void) strip(res);
+ return(TW_VARLIST);
+
+ case '(':
+ *pat = res = Strsave(&act[1]);
+ if ((p = Strchr(res, ')')) != NULL)
+ *p = '\0';
+ (void) strip(res);
+ return TW_WORDLIST;
+
+ case '`':
+ res = Strsave(act);
+ if ((p = Strchr(&res[1], '`')) != NULL)
+ *++p = '\0';
+
+ if (didfds == 0) {
+ /*
+ * Make sure that we have some file descriptors to
+ * play with, so that the processes have at least 0, 1, 2
+ * open
+ */
+ (void) dcopy(SHIN, 0);
+ (void) dcopy(SHOUT, 1);
+ (void) dcopy(SHDIAG, 2);
+ }
+ if ((p = globone(res, G_APPEND)) != NULL) {
+ xfree(res), res = NULL;
+ *pat = res = Strsave(p);
+ xfree(p);
+ return TW_WORDLIST;
+ }
+ return TW_ZERO;
+
+ default:
+ stderror(ERR_COMPCOM, short2str(act));
+ return TW_ZERO;
+ }
+
+ switch (act[1] & ~QUOTE) {
+ case '\0':
+ return looking;
+
+ case ':':
+ *pat = res = Strsave(&act[2]);
+ (void) strip(res);
+ return looking;
+
+ default:
+ stderror(ERR_COMPCOM, short2str(act));
+ return TW_ZERO;
+ }
+} /* end tw_result */
+
+
+/* tw_dollar():
+ * Expand $<n> args in buffer
+ */
+static const Char *
+tw_dollar(const Char *str, Char **wl, size_t nwl, Char **result, Char sep,
+ const char *msg)
+{
+ struct Strbuf buf = Strbuf_INIT;
+ Char *res;
+ const Char *sp;
+
+ for (sp = str; *sp && *sp != sep;)
+ if (sp[0] == '$' && sp[1] == ':' && Isdigit(sp[sp[2] == '-' ? 3 : 2])) {
+ int num, neg = 0;
+ sp += 2;
+ if (*sp == '-') {
+ neg = 1;
+ sp++;
+ }
+ for (num = *sp++ - '0'; Isdigit(*sp); num += 10 * num + *sp++ - '0')
+ continue;
+ if (neg)
+ num = nwl - num - 1;
+ if (num >= 0 && (size_t)num < nwl)
+ Strbuf_append(&buf, wl[num]);
+ }
+ else
+ Strbuf_append1(&buf, *sp++);
+
+ res = Strbuf_finish(&buf);
+
+ if (*sp++ == sep) {
+ *result = res;
+ return sp;
+ }
+
+ xfree(res);
+ /* Truncates data if WIDE_STRINGS */
+ stderror(ERR_COMPMIS, (int)sep, msg, short2str(str));
+ return --sp;
+} /* end tw_dollar */
+
+
+/* tw_complete():
+ * Return the appropriate completion for the command
+ *
+ * valid completion strings are:
+ * p/<range>/<completion>/[<suffix>/] positional
+ * c/<pattern>/<completion>/[<suffix>/] current word ignore pattern
+ * C/<pattern>/<completion>/[<suffix>/] current word with pattern
+ * n/<pattern>/<completion>/[<suffix>/] next word
+ * N/<pattern>/<completion>/[<suffix>/] next-next word
+ */
+int
+tw_complete(const Char *line, Char **word, Char **pat, int looking, eChar *suf)
+{
+ Char *buf, **vec, **wl;
+ static Char nomatch[2] = { (Char) ~0, 0x00 };
+ const Char *ptr;
+ size_t wordno;
+ int n;
+
+ buf = Strsave(line);
+ cleanup_push(buf, xfree);
+ /* Single-character words, empty current word, terminating NULL */
+ wl = xmalloc(((Strlen(line) + 1) / 2 + 2) * sizeof (*wl));
+ cleanup_push(wl, xfree);
+
+ /* find the command */
+ if ((wl[0] = tw_tok(buf)) == NULL || wl[0] == INVPTR) {
+ cleanup_until(buf);
+ return TW_ZERO;
+ }
+
+ /*
+ * look for hardwired command completions using a globbing
+ * search and for arguments using a normal search.
+ */
+ if ((vec = tw_find(wl[0], &completions, (looking == TW_COMMAND)))
+ == NULL) {
+ cleanup_until(buf);
+ return looking;
+ }
+
+ /* tokenize the line one more time :-( */
+ for (wordno = 1; (wl[wordno] = tw_tok(NULL)) != NULL &&
+ wl[wordno] != INVPTR; wordno++)
+ continue;
+
+ if (wl[wordno] == INVPTR) { /* Found a meta character */
+ cleanup_until(buf);
+ return TW_ZERO; /* de-activate completions */
+ }
+#ifdef TDEBUG
+ {
+ size_t i;
+ for (i = 0; i < wordno; i++)
+ xprintf("'%s' ", short2str(wl[i]));
+ xprintf("\n");
+ }
+#endif /* TDEBUG */
+
+ /* if the current word is empty move the last word to the next */
+ if (**word == '\0') {
+ wl[wordno] = *word;
+ wordno++;
+ }
+ wl[wordno] = NULL;
+
+
+#ifdef TDEBUG
+ xprintf("\r\n");
+ xprintf(" w#: %lu\n", (unsigned long)wordno);
+ xprintf("line: %s\n", short2str(line));
+ xprintf(" cmd: %s\n", short2str(wl[0]));
+ xprintf("word: %s\n", short2str(*word));
+ xprintf("last: %s\n", wordno >= 2 ? short2str(wl[wordno-2]) : "n/a");
+ xprintf("this: %s\n", wordno >= 1 ? short2str(wl[wordno-1]) : "n/a");
+#endif /* TDEBUG */
+
+ for (;vec != NULL && (ptr = vec[0]) != NULL; vec++) {
+ Char *ran, /* The pattern or range X/<range>/XXXX/ */
+ *com, /* The completion X/XXXXX/<completion>/ */
+ *pos = NULL; /* scratch pointer */
+ int cmd, res;
+ Char sep; /* the command and separator characters */
+
+ if (ptr[0] == '\0')
+ continue;
+
+#ifdef TDEBUG
+ xprintf("match %s\n", short2str(ptr));
+#endif /* TDEBUG */
+
+ switch (cmd = ptr[0]) {
+ case 'N':
+ pos = (wordno < 3) ? nomatch : wl[wordno - 3];
+ break;
+ case 'n':
+ pos = (wordno < 2) ? nomatch : wl[wordno - 2];
+ break;
+ case 'c':
+ case 'C':
+ pos = (wordno < 1) ? nomatch : wl[wordno - 1];
+ break;
+ case 'p':
+ break;
+ default:
+ stderror(ERR_COMPINV, CGETS(27, 1, "command"), cmd);
+ return TW_ZERO;
+ }
+
+ sep = ptr[1];
+ if (!Ispunct(sep)) {
+ /* Truncates data if WIDE_STRINGS */
+ stderror(ERR_COMPINV, CGETS(27, 2, "separator"), (int)sep);
+ return TW_ZERO;
+ }
+
+ ptr = tw_dollar(&ptr[2], wl, wordno, &ran, sep,
+ CGETS(27, 3, "pattern"));
+ cleanup_push(ran, xfree);
+ if (ran[0] == '\0') /* check for empty pattern (disallowed) */
+ {
+ stderror(ERR_COMPINC, cmd == 'p' ? CGETS(27, 4, "range") :
+ CGETS(27, 3, "pattern"), "");
+ return TW_ZERO;
+ }
+
+ ptr = tw_dollar(ptr, wl, wordno, &com, sep,
+ CGETS(27, 5, "completion"));
+ cleanup_push(com, xfree);
+
+ if (*ptr != '\0') {
+ if (*ptr == sep)
+ *suf = CHAR_ERR;
+ else
+ *suf = *ptr;
+ }
+ else
+ *suf = '\0';
+
+#ifdef TDEBUG
+ xprintf("command: %c\nseparator: %c\n", cmd, (int)sep);
+ xprintf("pattern: %s\n", short2str(ran));
+ xprintf("completion: %s\n", short2str(com));
+ xprintf("suffix: ");
+ switch (*suf) {
+ case 0:
+ xprintf("*auto suffix*\n");
+ break;
+ case CHAR_ERR:
+ xprintf("*no suffix*\n");
+ break;
+ default:
+ xprintf("%c\n", (int)*suf);
+ break;
+ }
+#endif /* TDEBUG */
+
+ switch (cmd) {
+ case 'p': /* positional completion */
+#ifdef TDEBUG
+ xprintf("p: tw_pos(%s, %lu) = ", short2str(ran),
+ (unsigned long)wordno - 1);
+ xprintf("%d\n", tw_pos(ran, wordno - 1));
+#endif /* TDEBUG */
+ if (!tw_pos(ran, wordno - 1)) {
+ cleanup_until(ran);
+ continue;
+ }
+ break;
+
+ case 'N': /* match with the next-next word */
+ case 'n': /* match with the next word */
+ case 'c': /* match with the current word */
+ case 'C':
+#ifdef TDEBUG
+ xprintf("%c: ", cmd);
+#endif /* TDEBUG */
+ if ((n = tw_match(pos, ran)) < 0) {
+ cleanup_until(ran);
+ continue;
+ }
+ if (cmd == 'c')
+ *word += n;
+ break;
+
+ default:
+ abort(); /* Cannot happen */
+ }
+ res = tw_result(com, pat);
+ cleanup_until(buf);
+ return res;
+ }
+ cleanup_until(buf);
+ *suf = '\0';
+ return TW_ZERO;
+} /* end tw_complete */
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