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/*
* zle_keymap.c - keymaps and key bindings
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 1992-1997 Paul Falstad
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and to distribute modified versions of this software for any
* purpose, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* In no event shall Paul Falstad or the Zsh Development Group be liable
* to any party for direct, indirect, special, incidental, or consequential
* damages arising out of the use of this software and its documentation,
* even if Paul Falstad and the Zsh Development Group have been advised of
* the possibility of such damage.
*
* Paul Falstad and the Zsh Development Group specifically disclaim any
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose. The software
* provided hereunder is on an "as is" basis, and Paul Falstad and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
*
*/

#include "zle.mdh"

/*
* Keymap structures:
*
* There is a hash table of keymap names. Each name just points to a keymap.
* More than one name may point to the same keymap.
*
* Each keymap consists of a table of bindings for each character, and a
* hash table of multi-character key bindings. The keymap has no individual
* name, but maintains a reference count.
*
* In a keymap's table of initial bindings, each character is either bound to
* a thingy, or is a prefix (in which case NULL is stored). Those prefix
* entries are matched by more complex entries in the multi-character
* binding hash table. Each entry in this hash table (which is indexed by
* metafied key sequence) either has a normal thingy binding or a string to
* send (in which case the NULL thingy is used). Each entry also has a count
* of other entries for which it is a prefix.
*/

typedef struct keymapname *KeymapName;
typedef struct key *Key;

struct keymapname {
    HashNode next; /* next in the hash chain */
    char *nam; /* name of the keymap */
    int flags; /* various flags (see below) */
    Keymap keymap; /* the keymap itsef */
};

/* Can't be deleted (.safe) */
#define KMN_IMMORTAL (1<<1)

struct keymap {
    Thingy first[256]; /* base binding of each character */
    HashTable multi; /* multi-character bindings */
    /*
* The "real" name of this keymap.
* For an aliased keymap, this is the first name to be defined.
* If this is deleted but there are other names we randomly pick another
* one, avoiding the name "main". The principal use
* for this is to make it clear what "main" is aliased to.
*
* If "main" is the only name for this map, this will be NULL.
* That's fine, there's no alias. We'll pick a primary if we
* alias "main" again.
*/
    KeymapName primary;
    int flags; /* various flags (see below) */
    int rc; /* reference count */
};

#define KM_IMMUTABLE (1<<1)

struct key {
    HashNode next; /* next in hash chain */
    char *nam; /* key sequence (metafied) */
    Thingy bind; /* binding of this key sequence */
    char *str; /* string for send-string (metafied) */
    int prefixct; /* number of sequences for which this is a prefix */
};

/* This structure is used when listing keymaps. */

struct bindstate {
    int flags;
    char *kmname;
    char *firstseq;
    char *lastseq;
    Thingy bind;
    char *str;
    char *prefix;
    int prefixlen;
};

/* This structure is used when scanning for prefix bindings to remove */

struct remprefstate {
    Keymap km;
    char *prefix;
    int prefixlen;
};

#define BS_LIST (1<<0)
#define BS_ALL (1<<1)

/* local functions */

#include "zle_keymap.pro"

/* currently selected keymap, and its name */

/**/
Keymap curkeymap, localkeymap;
/**/
char *curkeymapname;

/* the hash table of keymap names */

/**/
mod_export HashTable keymapnamtab;

/* key sequence reading data */

/**/
char *keybuf;

static int keybuflen, keybufsz = 20;

/* last command executed with execute-named-command */

static Thingy lastnamed;

/**********************************/
/* hashtable management functions */
/**********************************/

/**/
static void
createkeymapnamtab(void)
{
    keymapnamtab = newhashtable(7, "keymapnamtab", NULL);

    keymapnamtab->hash = hasher;
    keymapnamtab->emptytable = emptyhashtable;
    keymapnamtab->filltable = NULL;
    keymapnamtab->cmpnodes = strcmp;
    keymapnamtab->addnode = addhashnode;
    keymapnamtab->getnode = gethashnode2;
    keymapnamtab->getnode2 = gethashnode2;
    keymapnamtab->removenode = removehashnode;
    keymapnamtab->disablenode = NULL;
    keymapnamtab->enablenode = NULL;
    keymapnamtab->freenode = freekeymapnamnode;
    keymapnamtab->printnode = NULL;
}

/**/
static KeymapName
makekeymapnamnode(Keymap keymap)
{
    KeymapName kmn = (KeymapName) zshcalloc(sizeof(*kmn));

    kmn->keymap = keymap;
    return kmn;
}


/*
* Reference a keymap from a keymapname.
* Used when linking keymaps. This includes the first link to a
* newly created keymap.
*/

static void
refkeymap_by_name(KeymapName kmn)
{
    refkeymap(kmn->keymap);
    if (!kmn->keymap->primary && strcmp(kmn->nam, "main") != 0)
kmn->keymap->primary = kmn;
}

/*
* Communication to keymap scanner when looking for a new primary name.
*/
static Keymap km_rename_me;

/* Find a new primary name for a keymap. See below. */

static void
scanprimaryname(HashNode hn, int ignored)
{
    KeymapName n = (KeymapName) hn;

    (void)ignored;

    /* Check if we've already found a new primary name. */
    if (km_rename_me->primary)
return;
    /* Don't use "main". */
    if (!strcmp(n->nam, "main"))
return;
    if (n->keymap == km_rename_me)
km_rename_me->primary = n;
}

/*
* Unreference a keymap from a keymapname.
* Used when unlinking keymaps to ensure there is still a primary
* name for the keymap, unless it is an unaliased "main".
*/
static void
unrefkeymap_by_name(KeymapName kmname)
{
    Keymap km = kmname->keymap;
    if (unrefkeymap(km) && km->primary == kmname) {
/*
* The primary name for the keymap has gone,
* but the keymap is still referred to; find a new primary name
* for it. Sort the keymap to make the result deterministic.
*/
/* Set the primary name to NULL so we can check if we've found one */
km->primary = NULL;
km_rename_me = km;
scanhashtable(keymapnamtab, 1, 0, 0, scanprimaryname, 0);
/* Just for neatness */
km_rename_me = NULL;
    }
}


/**/
static void
freekeymapnamnode(HashNode hn)
{
    KeymapName kmn = (KeymapName) hn;

    zsfree(kmn->nam);
    unrefkeymap_by_name(kmn);
    zfree(kmn, sizeof(*kmn));
}

/**/
static HashTable
newkeytab(char *kmname)
{
    HashTable ht = newhashtable(19,
kmname ? dyncat("keytab:", kmname) : "keytab:", NULL);

    ht->hash = hasher;
    ht->emptytable = emptyhashtable;
    ht->filltable = NULL;
    ht->cmpnodes = strcmp;
    ht->addnode = addhashnode;
    ht->getnode = gethashnode2;
    ht->getnode2 = gethashnode2;
    ht->removenode = removehashnode;
    ht->disablenode = NULL;
    ht->enablenode = NULL;
    ht->freenode = freekeynode;
    ht->printnode = NULL;

    return ht;
}

/**/
static Key
makekeynode(Thingy t, char *str)
{
    Key k = (Key) zshcalloc(sizeof(*k));

    k->bind = t;
    k->str = str;
    return k;
}

/**/
static void
freekeynode(HashNode hn)
{
    Key k = (Key) hn;

    zsfree(k->nam);
    unrefthingy(k->bind);
    zsfree(k->str);
    zfree(k, sizeof(*k));
}

/**************************/
/* main keymap operations */
/**************************/

static HashTable copyto;

/**/
mod_export Keymap
newkeymap(Keymap tocopy, char *kmname)
{
    Keymap km = zshcalloc(sizeof(*km));
    int i;

    km->rc = 0;
    km->multi = newkeytab(kmname);
    if(tocopy) {
for(i = 256; i--; )
km->first[i] = refthingy(tocopy->first[i]);
copyto = km->multi;
scanhashtable(tocopy->multi, 0, 0, 0, scancopykeys, 0);
    } else {
for(i = 256; i--; )
km->first[i] = refthingy(t_undefinedkey);
    }
    return km;
}

/**/
static void
scancopykeys(HashNode hn, UNUSED(int flags))
{
    Key k = (Key) hn;
    Key kn = zalloc(sizeof(*k));

    memcpy(kn, k, sizeof(*k));
    refthingy(kn->bind);
    kn->str = ztrdup(k->str);
    copyto->addnode(copyto, ztrdup(k->nam), kn);
}

/**/
void
deletekeymap(Keymap km)
{
    int i;

    deletehashtable(km->multi);
    for(i = 256; i--; )
unrefthingy(km->first[i]);
    zfree(km, sizeof(*km));
}

static Keymap skm_km;
static int skm_last;
static KeyScanFunc skm_func;
static void *skm_magic;

/**/
void
scankeymap(Keymap km, int sort, KeyScanFunc func, void *magic)
{
    char m[3];

    skm_km = km;
    skm_last = sort ? -1 : 255;
    skm_func = func;
    skm_magic = magic;
    scanhashtable(km->multi, sort, 0, 0, scankeys, 0);
    if(!sort)
skm_last = -1;
    while(skm_last < 255) {
skm_last++;
if(km->first[skm_last] && km->first[skm_last] != t_undefinedkey) {
m[0] = skm_last;
metafy(m, 1, META_NOALLOC);
func(m, km->first[skm_last], NULL, magic);
}
    }
}

/**/
static void
scankeys(HashNode hn, UNUSED(int flags))
{
    Key k = (Key) hn;
    int f = k->nam[0] == Meta ? STOUC(k->nam[1])^32 : STOUC(k->nam[0]);
    char m[3];

    while(skm_last < f) {
skm_last++;
if(skm_km->first[skm_last] &&
skm_km->first[skm_last] != t_undefinedkey) {
m[0] = skm_last;
metafy(m, 1, META_NOALLOC);
skm_func(m, skm_km->first[skm_last], NULL, skm_magic);
}
    }
    skm_func(k->nam, k->bind, k->str, skm_magic);
}

/**************************/
/* keymap name operations */
/**************************/

/**/
Keymap
openkeymap(char *name)
{
    KeymapName n = (KeymapName) keymapnamtab->getnode(keymapnamtab, name);
    return n ? n->keymap : NULL;
}

/**/
mod_export int
unlinkkeymap(char *name, int ignm)
{
    KeymapName n = (KeymapName) keymapnamtab->getnode(keymapnamtab, name);
    if(!n)
return 2;
    if(!ignm && (n->flags & KMN_IMMORTAL))
return 1;
    keymapnamtab->freenode(keymapnamtab->removenode(keymapnamtab, name));
    return 0;
}

/**/
mod_export int
linkkeymap(Keymap km, char *name, int imm)
{
    KeymapName n = (KeymapName) keymapnamtab->getnode(keymapnamtab, name);
    if(n) {
if(n->flags & KMN_IMMORTAL)
return 1;
if(n->keymap == km)
return 0;
unrefkeymap_by_name(n);
n->keymap = km;
    } else {
n = makekeymapnamnode(km);
if (imm)
n->flags |= KMN_IMMORTAL;
keymapnamtab->addnode(keymapnamtab, ztrdup(name), n);
    }
    refkeymap_by_name(n);
    return 0;
}

/**/
void
refkeymap(Keymap km)
{
    km->rc++;
}

/* Unreference keymap, returning new reference count, 0 if deleted */

/**/
int
unrefkeymap(Keymap km)
{
    if (!--km->rc) {
deletekeymap(km);
return 0;
    }

    return km->rc;
}

/* Select a keymap as the current ZLE keymap. Can optionally fall back *
* on the guaranteed safe keymap if it fails. */

/**/
int
selectkeymap(char *name, int fb)
{
    Keymap km = openkeymap(name);

    if(!km) {
char *nm = nicedup(name, 0);
char *msg = tricat("No such keymap `", nm, "'");

zsfree(nm);
showmsg(msg);
zsfree(msg);
if(!fb)
return 1;
km = openkeymap(name = ".safe");
    }
    if(name != curkeymapname) {
char *oname = curkeymapname;

curkeymapname = ztrdup(name);

if (oname && zleactive && strcmp(oname, curkeymapname))
zlecallhook("zle-keymap-select", oname);
zsfree(oname);
    }
    curkeymap = km;
    return 0;
}

/* Select a local key map. */

/**/
mod_export void
selectlocalmap(Keymap m)
{
    localkeymap = m;
}

/* Reopen the currently selected keymap, in case it got deleted. This *
* should be called after doing anything that might have run an *
* arbitrary user-specified command. */

/**/
void
reselectkeymap(void)
{
    selectkeymap(curkeymapname, 1);
}

/******************************/
/* operations on key bindings */
/******************************/

/* Add/delete/change a keybinding in some keymap. km is the keymap to be *
* altered. seq is the metafied key sequence whose binding is to change. *
* bind is the thingy to which the key sequence is to be bound. For *
* send-string, bind is NULL and str is the metafied key sequence to push *
* back onto the input. */

/**/
mod_export int
bindkey(Keymap km, char *seq, Thingy bind, char *str)
{
    Key k;
    int f = seq[0] == Meta ? STOUC(seq[1])^32 : STOUC(seq[0]);
    char *buf, *ptr;

    if(km->flags & KM_IMMUTABLE)
return 1;
    if(!*seq)
return 2;
    if(!bind || ztrlen(seq) > 1) {
/* key needs to become a prefix if isn't one already */
if(km->first[f]) {
char fs[3];
fs[0] = f;
fs[1] = 0;
metafy(fs, 1, META_NOALLOC);
km->multi->addnode(km->multi, ztrdup(fs),
makekeynode(km->first[f], NULL));
km->first[f] = NULL;
}
k = (Key) km->multi->getnode(km->multi, seq);
    } else {
/* If the sequence is a prefix entry only due to being *
* a send-string binding, we can remove that entry. */
if(!km->first[f]) {
k = (Key) km->multi->getnode(km->multi, seq);
if(!k->prefixct)
km->multi->freenode(km->multi->removenode(km->multi, seq));
else
goto domulti;
} else
unrefthingy(km->first[f]);
/* Just replace the single-character binding. */
km->first[f] = bind;
return 0;
    }
    domulti:
    buf = ztrdup(seq);
    ptr = strchr(buf, 0);
    if(bind == t_undefinedkey) {
if(k) {
zsfree(k->str);
unrefthingy(k->bind);
k->bind = t_undefinedkey;
k->str = NULL;
while(!k->prefixct && k->bind == t_undefinedkey) {
km->multi->freenode(km->multi->removenode(km->multi, buf));
*--ptr = 0;
if(ptr[-1] == Meta)
*--ptr = 0;
k = (Key) km->multi->getnode(km->multi, buf);
k->prefixct--;
if(!k->prefixct && k->bind &&
(!buf[1] || (buf[0] == Meta && !buf[2]))) {
km->first[f] = refthingy(k->bind);
km->multi->freenode(km->multi->removenode(km->multi, buf));
break;
}
}
}
    } else {
if(!k) {
int added;

km->multi->addnode(km->multi, ztrdup(buf), makekeynode(bind, ztrdup(str)));
do {
*--ptr = 0;
if(ptr > buf && ptr[-1] == Meta)
*--ptr = 0;
k = (Key) km->multi->getnode(km->multi, buf);
if((added = !k))
km->multi->addnode(km->multi, ztrdup(buf),
k = makekeynode(refthingy(t_undefinedkey), NULL));
k->prefixct++;
} while(added);
} else {
unrefthingy(k->bind);
zsfree(k->str);
k->bind = bind;
k->str = bind ? NULL : ztrdup(str);
}
    }
    free(buf);
    return 0;
}

/* Look up a key binding. The binding is returned. In the case of a *
* send-string, NULL is returned and *strp is modified to point to the *
* metafied string of characters to be pushed back. */

/**/
Thingy
keybind(Keymap km, char *seq, char **strp)
{
    Key k;

    if(ztrlen(seq) == 1) {
int f = seq[0] == Meta ? STOUC(seq[1])^32 : STOUC(seq[0]);
Thingy bind = km->first[f];

if(bind)
return bind;
    }
    k = (Key) km->multi->getnode(km->multi, seq);
    if(!k)
return t_undefinedkey;
    *strp = k->str;
    return k->bind;
}

/* Check whether a key sequence is a prefix of a longer bound sequence. *
* One oddity: if *nothing* in the keymap is bound, this returns true *
* for the empty sequence, even though this is not strictly accurate. */

/**/
static int
keyisprefix(Keymap km, char *seq)
{
    Key k;

    if(!*seq)
return 1;
    if(ztrlen(seq) == 1) {
int f = seq[0] == Meta ? STOUC(seq[1])^32 : STOUC(seq[0]);

if(km->first[f])
return 0;
    }
    k = (Key) km->multi->getnode(km->multi, seq);
    return k && k->prefixct;
}

/*******************/
/* bindkey builtin */
/*******************/

/*
* THE BINDKEY BUILTIN
*
* Keymaps can be specified to bindkey in the following ways:
*
* -e select "emacs", also link it to "main"
* -v select "viins", also link it to "main"
* -a select "vicmd"
* -M first argument gives map name
* defaults to "main"
*
* These operations cannot have a keymap selected in the normal way:
*
* -l list all the keymap names
* -d delete all keymaps and reset to the default state (no arguments)
* -D delete named keymaps
* -A link the two named keymaps (2 arguments)
* -N create new empty keymap (1 argument)
* -N create new keymap, copying the second named keymap (2 arguments)
*
* Other operations:
*
* -m add the meta bindings to the selected keymap (no arguments)
* -r unbind each named string in the selected keymap
* -s bind send-strings in the selected keymap (2+ arguments)
* bind commands in the selected keymap (2+ arguments)
* display one binding in the selected keymap (1 argument)
* display the entire selected keymap (no arguments)
*
* There is an exception that the entire keymap display will not be performed
* if the -e or -v options were used.
*
* Other options:
*
* -L do listings in the form of bindkey commands
* -R for the binding operations, accept ranges instead of sequences
*/

/**/
int
bin_bindkey(char *name, char **argv, Options ops, UNUSED(int func))
{
    static struct opn {
char o;
char selp;
int (*func) _((char *, char *, Keymap, char **, Options, char));
int min, max;
    } const opns[] = {
{ 'l', 0, bin_bindkey_lsmaps, 0, -1 },
{ 'd', 0, bin_bindkey_delall, 0, 0 },
{ 'D', 0, bin_bindkey_del, 1, -1 },
{ 'A', 0, bin_bindkey_link, 2, 2 },
{ 'N', 0, bin_bindkey_new, 1, 2 },
{ 'm', 1, bin_bindkey_meta, 0, 0 },
{ 'r', 1, bin_bindkey_bind, 1, -1 },
{ 's', 1, bin_bindkey_bind, 2, -1 },
{ 0, 1, bin_bindkey_bind, 0, -1 },
    };
    struct opn const *op, *opp;
    char *kmname;
    Keymap km;
    int n;

    /* select operation and ensure no clashing arguments */
    for(op = opns; op->o && !OPT_ISSET(ops,STOUC(op->o)); op++) ;
    if(op->o)
for(opp = op; (++opp)->o; )
if(OPT_ISSET(ops,STOUC(opp->o))) {
zwarnnam(name, "incompatible operation selection options");
return 1;
}
    n = OPT_ISSET(ops,'e') + OPT_ISSET(ops,'v') +
OPT_ISSET(ops,'a') + OPT_ISSET(ops,'M');
    if(!op->selp && n) {
zwarnnam(name, "keymap cannot be selected with -%c", op->o);
return 1;
    }
    if(n > 1) {
zwarnnam(name, "incompatible keymap selection options");
return 1;
    }

    /* keymap selection */
    if(op->selp) {
if(OPT_ISSET(ops,'e'))
kmname = "emacs";
else if(OPT_ISSET(ops,'v'))
kmname = "viins";
else if(OPT_ISSET(ops,'a'))
kmname = "vicmd";
else if(OPT_ISSET(ops,'M')) {
kmname = OPT_ARG(ops,'M');
} else
kmname = "main";
km = openkeymap(kmname);
if(!km) {
zwarnnam(name, "no such keymap `%s'", kmname);
return 1;
}
if(OPT_ISSET(ops,'e') || OPT_ISSET(ops,'v'))
linkkeymap(km, "main", 0);
    } else {
kmname = NULL;
km = NULL;
    }

    /* listing is a special case */
    if(!op->o && (!argv[0] || !argv[1])) {
if(OPT_ISSET(ops,'e') || OPT_ISSET(ops,'v'))
return 0;
return bin_bindkey_list(name, kmname, km, argv, ops, op->o);
    }

    /* check number of arguments */
    for(n = 0; argv[n]; n++) ;
    if(n < op->min) {
zwarnnam(name, "not enough arguments for -%c", op->o);
return 1;
    } else if(op->max != -1 && n > op->max) {
zwarnnam(name, "too many arguments for -%c", op->o);
return 1;
    }

    /* pass on the work to the operation function */
    return op->func(name, kmname, km, argv, ops, op->o);
}

/* list the available keymaps */

/**/
static int
bin_bindkey_lsmaps(char *name, UNUSED(char *kmname), UNUSED(Keymap km), char **argv, Options ops, UNUSED(char func))
{
    int ret = 0;
    if (*argv) {
for (; *argv; argv++) {
KeymapName kmn = (KeymapName)
keymapnamtab->getnode(keymapnamtab, *argv);
if (!kmn) {
zwarnnam(name, "no such keymap: `%s'", *argv);
ret = 1;
} else {
scanlistmaps((HashNode)kmn, OPT_ISSET(ops,'L'));
}
}
    } else {
scanhashtable(keymapnamtab, 1, 0, 0, scanlistmaps, OPT_ISSET(ops,'L'));
    }
    return ret;
}

/**/
static void
scanlistmaps(HashNode hn, int list_verbose)
{
    KeymapName n = (KeymapName) hn;

    if (list_verbose) {
Keymap km = n->keymap;
/*
* Don't list ".safe" as a bindkey command; we can't
* actually create it that way.
*/
if (!strcmp(n->nam, ".safe"))
return;
fputs("bindkey -", stdout);
if (km->primary && km->primary != n) {
KeymapName pn = km->primary;
fputs("A ", stdout);
if (pn->nam[0] == '-')
fputs("-- ", stdout);
quotedzputs(pn->nam, stdout);
fputc(' ', stdout);
} else {
fputs("N ", stdout);
if(n->nam[0] == '-')
fputs("-- ", stdout);
}
quotedzputs(n->nam, stdout);
    } else
nicezputs(n->nam, stdout);
    putchar('\n');
}

/* reset all keymaps to the default state */

/**/
static int
bin_bindkey_delall(UNUSED(char *name), UNUSED(char *kmname), UNUSED(Keymap km), UNUSED(char **argv), UNUSED(Options ops), UNUSED(char func))
{
    keymapnamtab->emptytable(keymapnamtab);
    default_bindings();
    return 0;
}

/* delete named keymaps */

/**/
static int
bin_bindkey_del(char *name, UNUSED(char *kmname), UNUSED(Keymap km), char **argv, UNUSED(Options ops), UNUSED(char func))
{
    int ret = 0;

    do {
int r = unlinkkeymap(*argv, 0);
if(r == 1)
zwarnnam(name, "keymap name `%s' is protected", *argv);
else if(r == 2)
zwarnnam(name, "no such keymap `%s'", *argv);
ret |= !!r;
    } while(*++argv);
    return ret;
}

/* link named keymaps */

/**/
static int
bin_bindkey_link(char *name, UNUSED(char *kmname), Keymap km, char **argv, UNUSED(Options ops), UNUSED(char func))
{
    km = openkeymap(argv[0]);
    if(!km) {
zwarnnam(name, "no such keymap `%s'", argv[0]);
return 1;
    } else if(linkkeymap(km, argv[1], 0)) {
zwarnnam(name, "keymap name `%s' is protected", argv[1]);
return 1;
    }
    return 0;
}

/* create a new keymap */

/**/
static int
bin_bindkey_new(char *name, UNUSED(char *kmname), Keymap km, char **argv, UNUSED(Options ops), UNUSED(char func))
{
    KeymapName kmn = (KeymapName) keymapnamtab->getnode(keymapnamtab, argv[0]);

    if(kmn && (kmn -> flags & KMN_IMMORTAL)) {
zwarnnam(name, "keymap name `%s' is protected", argv[0]);
return 1;
    }
    if(argv[1]) {
km = openkeymap(argv[1]);
if(!km) {
zwarnnam(name, "no such keymap `%s'", argv[0]);
return 1;
}
    } else
km = NULL;
    linkkeymap(newkeymap(km, argv[0]), argv[0], 0);
    return 0;
}

/* Add standard meta bindings to a keymap. Only sequences currently either *
* unbound or bound to self-insert are affected. Note that the use of *
* bindkey() is quite necessary: if this function were to go through the *
* km->first table itself, it would miss any prefix sequences that should *
* be rebound. */

/**/
static int
bin_bindkey_meta(char *name, char *kmname, Keymap km, UNUSED(char **argv), UNUSED(Options ops), UNUSED(char func))
{
    char m[3], *str;
    int i;
    Thingy fn;

    if(km->flags & KM_IMMUTABLE) {
zwarnnam(name, "keymap `%s' is protected", kmname);
return 1;
    }
#ifdef MULTIBYTE_SUPPORT
    zwarnnam(name, "warning: `bindkey -m' disables multibyte support");
#endif
    for(i = 128; i < 256; i++)
if(metabind[i - 128] != z_undefinedkey) {
m[0] = i;
metafy(m, 1, META_NOALLOC);
fn = keybind(km, m, &str);
if(fn == t_selfinsert || fn == t_undefinedkey)
bindkey(km, m, refthingy(Th(metabind[i - 128])), NULL);
}
    return 0;
}

/* Change key bindings. func can be: *
* 'r' bind sequences to undefined-key *
* 's' bind sequneces to specified send-strings *
* 0 bind sequences to specified functions *
* If the -R option is used, bind to key ranges *
* instead of single key sequences. */

/**/
static int
bin_bindkey_bind(char *name, char *kmname, Keymap km, char **argv, Options ops, char func)
{
    int ret = 0;

    if(!func || func == 's') {
char **a;

for(a = argv+2; *a; a++)
if(!*++a) {
zwarnnam(name, "even number of arguments required");
return 1;
}
    }
    if(km->flags & KM_IMMUTABLE) {
zwarnnam(name, "keymap `%s' is protected", kmname);
return 1;
    }
    if (func == 'r' && OPT_ISSET(ops,'p')) {
char *useq, *bseq;
int len;
struct remprefstate rps;
rps.km = km;
while ((useq = *argv++)) {
bseq = getkeystring(useq, &len, GETKEYS_BINDKEY, NULL);
rps.prefix = metafy(bseq, len, META_USEHEAP);
rps.prefixlen = strlen(rps.prefix);
scankeymap(km, 0, scanremoveprefix, &rps);
}
return 0;
    }
    do {
char *useq = *argv, *bseq, *seq, *str;
int len;
Thingy fn;

if(func == 'r') {
fn = refthingy(t_undefinedkey);
str = NULL;
} else if(func == 's') {
str = getkeystring(*++argv, &len, GETKEYS_BINDKEY, NULL);
fn = NULL;
str = metafy(str, len, META_HREALLOC);
} else {
fn = rthingy(*++argv);
str = NULL;
}
bseq = getkeystring(useq, &len, GETKEYS_BINDKEY, NULL);
seq = metafy(bseq, len, META_USEHEAP);
if(OPT_ISSET(ops,'R')) {
int first, last;
char m[3];

if(len < 2 || len > 2 + (bseq[1] == '-') ||
(first = STOUC(bseq[0])) > (last = STOUC(bseq[len - 1]))) {
zwarnnam(name, "malformed key range `%s'", useq);
ret = 1;
} else {
for(; first <= last; first++) {
m[0] = first;
metafy(m, 1, META_NOALLOC);
bindkey(km, m, refthingy(fn), str);
}
}
unrefthingy(fn);
} else {
if(bindkey(km, seq, fn, str)) {
zwarnnam(name, "cannot bind to an empty key sequence");
unrefthingy(fn);
ret = 1;
}
}
    } while(*++argv);
    return ret;
}

/* Remove bindings for key sequences which have the given (proper) prefix. */

/**/
static void
scanremoveprefix(char *seq, UNUSED(Thingy bind), UNUSED(char *str), void *magic)
{
    struct remprefstate *rps = magic;

    if (strncmp(seq, rps->prefix, rps->prefixlen) || !seq[rps->prefixlen])
return;

    bindkey(rps->km, seq, refthingy(t_undefinedkey), NULL);
}

/* List key bindings. If an argument is given, list just that one *
* binding, otherwise list the entire keymap. If the -L option is *
* given, list in the form of bindkey commands. */

/**/
static int
bin_bindkey_list(char *name, char *kmname, Keymap km, char **argv, Options ops, UNUSED(char func))
{
    struct bindstate bs;

    bs.flags = OPT_ISSET(ops,'L') ? BS_LIST : 0;
    bs.kmname = kmname;
    if(argv[0] && !OPT_ISSET(ops,'p')) {
int len;
char *seq;

seq = getkeystring(argv[0], &len, GETKEYS_BINDKEY, NULL);
seq = metafy(seq, len, META_HREALLOC);
bs.flags |= BS_ALL;
bs.firstseq = bs.lastseq = seq;
bs.bind = keybind(km, seq, &bs.str);
bs.prefix = NULL;
bs.prefixlen = 0;
bindlistout(&bs);
    } else {
/* empty prefix is equivalent to no prefix */
if (OPT_ISSET(ops,'p') && (!argv[0] || argv[0][0])) {
if (!argv[0]) {
zwarnnam(name, "option -p requires a prefix string");
return 1;
}
bs.prefix = getkeystring(argv[0], &bs.prefixlen, GETKEYS_BINDKEY,
NULL);
bs.prefix = metafy(bs.prefix, bs.prefixlen, META_HREALLOC);
bs.prefixlen = strlen(bs.prefix);
} else {
bs.prefix = NULL;
bs.prefixlen = 0;
}
bs.firstseq = ztrdup("");
bs.lastseq = ztrdup("");
bs.bind = t_undefinedkey;
bs.str = NULL;
scankeymap(km, 1, scanbindlist, &bs);
bindlistout(&bs);
zsfree(bs.firstseq);
zsfree(bs.lastseq);
    }
    return 0;
}

/**/
static void
scanbindlist(char *seq, Thingy bind, char *str, void *magic)
{
    struct bindstate *bs = magic;

    if (bs->prefixlen &&
(strncmp(seq, bs->prefix, bs->prefixlen) || !seq[bs->prefixlen]))
return;

    if(bind == bs->bind && (bind || !strcmp(str, bs->str)) &&
       ztrlen(seq) == 1 && ztrlen(bs->lastseq) == 1) {
int l = bs->lastseq[1] ?
STOUC(bs->lastseq[1]) ^ 32 : STOUC(bs->lastseq[0]);
int t = seq[1] ? STOUC(seq[1]) ^ 32 : STOUC(seq[0]);

if(t == l + 1) {
zsfree(bs->lastseq);
bs->lastseq = ztrdup(seq);
return;
}
    }
    bindlistout(bs);
    zsfree(bs->firstseq);
    bs->firstseq = ztrdup(seq);
    zsfree(bs->lastseq);
    bs->lastseq = ztrdup(seq);
    bs->bind = bind;
    bs->str = str;
}

/**/
static void
bindlistout(struct bindstate *bs)
{
    int range;

    if(bs->bind == t_undefinedkey && !(bs->flags & BS_ALL))
return;
    range = strcmp(bs->firstseq, bs->lastseq);
    if(bs->flags & BS_LIST) {
int nodash = 1;

fputs("bindkey ", stdout);
if(range)
fputs("-R ", stdout);
if(!bs->bind)
fputs("-s ", stdout);
if(!strcmp(bs->kmname, "main"))
;
else if(!strcmp(bs->kmname, "vicmd"))
fputs("-a ", stdout);
else {
fputs("-M ", stdout);
quotedzputs(bs->kmname, stdout);
putchar(' ');
nodash = 0;
}
if(nodash && bs->firstseq[0] == '-')
fputs("-- ", stdout);
    }
    printbind(bs->firstseq, stdout);
    if(range) {
putchar('-');
printbind(bs->lastseq, stdout);
    }
    putchar(' ');
    if(bs->bind) {
if (bs->flags & BS_LIST)
quotedzputs(bs->bind->nam, stdout);
else
nicezputs(bs->bind->nam, stdout);
    } else
printbind(bs->str, stdout);
    putchar('\n');
}

/****************************/
/* initialisation functions */
/****************************/

/* main initialisation entry point */

/**/
void
init_keymaps(void)
{
    createkeymapnamtab();
    default_bindings();
    keybuf = (char *)zalloc(keybufsz);
    lastnamed = refthingy(t_undefinedkey);
}

/* cleanup entry point (for unloading the zle module) */

/**/
void
cleanup_keymaps(void)
{
    unrefthingy(lastnamed);
    deletehashtable(keymapnamtab);
    zfree(keybuf, keybufsz);
}

static char *cursorptr;

/* utility function for termcap output routine to add to string */

static int
add_cursor_char(int c)
{
    *cursorptr++ = c;
    return 0;
}

/* interrogate termcap for cursor keys and add bindings to keymap */

/**/
static void
add_cursor_key(Keymap km, int tccode, Thingy thingy, int defchar)
{
    char buf[2048];
    int ok = 0;

    /*
* Be careful not to try too hard with bindings for dubious or
* dysfunctional terminals.
*/
    if (tccan(tccode) && !(termflags & (TERM_NOUP|TERM_BAD|TERM_UNKNOWN))) {
/*
* We can use the real termcap sequence. We need to
* persuade termcap to output `move cursor 1 char' and capture it.
*/
cursorptr = buf;
tputs(tcstr[tccode], 1, add_cursor_char);
*cursorptr = '\0';

/*
* Sanity checking. If the cursor key is zero-length (unlikely,
* but this is termcap we're talking about), or it's a single
* character, then we don't bind it.
*/
if (buf[0] && buf[1] && (buf[0] != Meta || buf[2]))
ok = 1;
    }
    if (!ok) {
/* Assume the normal VT100-like values. */
sprintf(buf, "\33[%c", defchar);
    }
    bindkey(km, buf, refthingy(thingy), NULL);

    /*
* If the string looked like \e[? or \eO?, bind the other one, too.
* This is necessary to make cursor keys work on many xterms with
* both normal and application modes.
*/
    if (buf[0] == '\33' && (buf[1] == '[' || buf[1] == 'O') &&
buf[2] && !buf[3])
    {
buf[1] = (buf[1] == '[') ? 'O' : '[';
bindkey(km, buf, refthingy(thingy), NULL);
    }
}

/* Create the default keymaps. For efficiency reasons, this function *
* assigns directly to the km->first array. It knows that there are no *
* prefix bindings in the way, and that it is using a simple keymap. */

/**/
static void
default_bindings(void)
{
    Keymap vmap = newkeymap(NULL, "viins");
    Keymap emap = newkeymap(NULL, "emacs");
    Keymap amap = newkeymap(NULL, "vicmd");
    Keymap smap = newkeymap(NULL, ".safe");
    Keymap vimaps[2], kptr;
    char buf[3], *ed;
    int i;

    /* vi insert mode and emacs mode: *
* 0-31 taken from the tables *
* 32-126 self-insert *
* 127 same as entry[8] *
* 128-255 self-insert */
    for (i = 0; i < 32; i++) {
vmap->first[i] = refthingy(Th(viinsbind[i]));
emap->first[i] = refthingy(Th(emacsbind[i]));
    }
    for (i = 32; i < 256; i++) {
vmap->first[i] = refthingy(t_selfinsert);
emap->first[i] = refthingy(t_selfinsert);
    }
    unrefthingy(t_selfinsert);
    unrefthingy(t_selfinsert);
    vmap->first[127] = refthingy(vmap->first[8]);
    emap->first[127] = refthingy(emap->first[8]);

    /* vi command mode: *
* 0-127 taken from the table *
* 128-255 undefined-key */
    for (i = 0; i < 128; i++)
amap->first[i] = refthingy(Th(vicmdbind[i]));
    for (i = 128; i < 256; i++)
amap->first[i] = refthingy(t_undefinedkey);

    /* safe fallback keymap:
* 0-255 self-insert, except: *
* '\n' accept-line *
* '\r' accept-line */
    for (i = 0; i < 256; i++)
smap->first[i] = refthingy(t_selfinsert);
    unrefthingy(t_selfinsert);
    unrefthingy(t_selfinsert);
    smap->first['\n'] = refthingy(t_acceptline);
    smap->first['\r'] = refthingy(t_acceptline);

    /* vt100 arrow keys are bound by default, for historical reasons. *
* Both standard and keypad modes are supported. */

    vimaps[0] = vmap;
    vimaps[1] = amap;
    for (i = 0; i < 2; i++) {
kptr = vimaps[i];
/* vi command and insert modes: arrow keys */
add_cursor_key(kptr, TCUPCURSOR, t_uplineorhistory, 'A');
add_cursor_key(kptr, TCDOWNCURSOR, t_downlineorhistory, 'B');
add_cursor_key(kptr, TCLEFTCURSOR, t_vibackwardchar, 'D');
add_cursor_key(kptr, TCRIGHTCURSOR, t_viforwardchar, 'C');
    }

    /* emacs mode: arrow keys */
    add_cursor_key(emap, TCUPCURSOR, t_uplineorhistory, 'A');
    add_cursor_key(emap, TCDOWNCURSOR, t_downlineorhistory, 'B');
    add_cursor_key(emap, TCLEFTCURSOR, t_backwardchar, 'D');
    add_cursor_key(emap, TCRIGHTCURSOR, t_forwardchar, 'C');
   
    /* emacs mode: ^X sequences */
    bindkey(emap, "\30*", refthingy(t_expandword), NULL);
    bindkey(emap, "\30g", refthingy(t_listexpand), NULL);
    bindkey(emap, "\30G", refthingy(t_listexpand), NULL);
    bindkey(emap, "\30\16", refthingy(t_infernexthistory), NULL);
    bindkey(emap, "\30\13", refthingy(t_killbuffer), NULL);
    bindkey(emap, "\30\6", refthingy(t_vifindnextchar), NULL);
    bindkey(emap, "\30\17", refthingy(t_overwritemode), NULL);
    bindkey(emap, "\30\25", refthingy(t_undo), NULL);
    bindkey(emap, "\30\26", refthingy(t_vicmdmode), NULL);
    bindkey(emap, "\30\12", refthingy(t_vijoin), NULL);
    bindkey(emap, "\30\2", refthingy(t_vimatchbracket), NULL);
    bindkey(emap, "\30s", refthingy(t_historyincrementalsearchforward), NULL);
    bindkey(emap, "\30r", refthingy(t_historyincrementalsearchbackward), NULL);
    bindkey(emap, "\30u", refthingy(t_undo), NULL);
    bindkey(emap, "\30\30", refthingy(t_exchangepointandmark), NULL);
    bindkey(emap, "\30=", refthingy(t_whatcursorposition), NULL);

    /* emacs mode: ESC sequences, all taken from the meta binding table */
    buf[0] = '\33';
    buf[2] = 0;
    for (i = 0; i < 128; i++)
if (metabind[i] != z_undefinedkey) {
buf[1] = i;
bindkey(emap, buf, refthingy(Th(metabind[i])), NULL);
}

    /* Put the keymaps in the right namespace. The "main" keymap *
* will be linked to the "emacs" keymap, except that if VISUAL *
* or EDITOR contain the string "vi" then it will be linked to *
* the "viins" keymap. */
    linkkeymap(vmap, "viins", 0);
    linkkeymap(emap, "emacs", 0);
    linkkeymap(amap, "vicmd", 0);
    linkkeymap(smap, ".safe", 1);
    if (((ed = zgetenv("VISUAL")) && strstr(ed, "vi")) ||
((ed = zgetenv("EDITOR")) && strstr(ed, "vi")))
linkkeymap(vmap, "main", 0);
    else
linkkeymap(emap, "main", 0);

    /* the .safe map cannot be modified or deleted */
    smap->flags |= KM_IMMUTABLE;

    /* isearch keymap: initially empty */
    isearch_keymap = newkeymap(NULL, "isearch");
    linkkeymap(isearch_keymap, "isearch", 0);

    /* command keymap: make sure accept-line and send-break are bound */
    command_keymap = newkeymap(NULL, "command");
    command_keymap->first['\n'] = refthingy(t_acceptline);
    command_keymap->first['\r'] = refthingy(t_acceptline);
    command_keymap->first['G'&0x1F] = refthingy(t_sendbreak);
    linkkeymap(command_keymap, "command", 0);
}

/*************************/
/* reading key sequences */
/*************************/

/* read a sequence of keys that is bound to some command in a keymap */

/**/
char *
getkeymapcmd(Keymap km, Thingy *funcp, char **strp)
{
    Thingy func = t_undefinedkey;
    char *str = NULL;
    int lastlen = 0, lastc = lastchar;

    keybuflen = 0;
    keybuf[0] = 0;
    /*
* getkeybuf returns multibyte strings, which may not
* yet correspond to complete wide characters, regardless
* of the locale. This is because we can't be sure whether
* the key bindings and keyboard input always return such
* characters. So we always look up bindings for each
* chunk of string. Intelligence within self-insert tries
* to fix up insertion of real wide characters properly.
*
* Note that this does not stop the user binding wide characters to
* arbitrary functions, just so long as the string used in the
* argument to bindkey is in the correct form for the locale.
* That's beyond our control.
*/
    while(getkeybuf(!!lastlen) != EOF) {
char *s;
Thingy f;
int loc = !!localkeymap;
int ispfx = 0;

if (loc) {
loc = ((f = keybind(localkeymap, keybuf, &s)) != t_undefinedkey);
ispfx = keyisprefix(localkeymap, keybuf);
}
if (!loc)
f = keybind(km, keybuf, &s);
ispfx |= keyisprefix(km, keybuf);

if (f != t_undefinedkey) {
lastlen = keybuflen;
func = f;
str = s;
lastc = lastchar;
}
if (!ispfx)
break;
    }
    if(!lastlen && keybuflen)
lastlen = keybuflen;
    else
lastchar = lastc;
    if(lastlen != keybuflen) {
unmetafy(keybuf + lastlen, &keybuflen);
ungetbytes(keybuf+lastlen, keybuflen);
if(vichgflag)
vichgbufptr -= keybuflen;
keybuf[lastlen] = 0;
    }
    *funcp = func;
    *strp = str;
    return keybuf;
}

/*
* Add a (possibly metafied) byte to the key input so far.
* This handles individual bytes of a multibyte string separately;
* see note in getkeymapcmd. Hence there is no wide character
* support at this level.
*
* TODO: Need to be careful about whether we return EOF in the
* middle of a wide character. However, I think we're OK since
* EOF and 0xff are distinct and we're reading bytes from the
* lower level, so EOF really does mean something went wrong. Even so,
* I'm worried enough to leave this note here for now.
*/

/**/
static int
getkeybuf(int w)
{
    int c = getbyte((long)w, NULL);

    if(c < 0)
return EOF;
    if(keybuflen + 3 > keybufsz)
keybuf = realloc(keybuf, keybufsz *= 2);
    if(imeta(c)) {
keybuf[keybuflen++] = Meta;
keybuf[keybuflen++] = c ^ 32;
    } else
keybuf[keybuflen++] = c;
    keybuf[keybuflen] = 0;
    return c;
}

/* Push back the last command sequence read by getkeymapcmd(). *
* Must be executed at most once after each getkeymapcmd(). */

/**/
mod_export void
ungetkeycmd(void)
{
    ungetbytes(keybuf, keybuflen);
}

/* read a command from the current keymap, with widgets */

/**/
mod_export Thingy
getkeycmd(void)
{
    Thingy func;
    int hops = 0;
    char *seq, *str;

    sentstring:
    seq = getkeymapcmd(curkeymap, &func, &str);
    if(!*seq)
return NULL;
    if(!func) {
int len;
char *pb;

if (++hops == 20) {
zerr("string inserting another one too many times");
hops = 0;
return NULL;
}
pb = unmetafy(ztrdup(str), &len);
ungetbytes(pb, len);
zfree(pb, strlen(str) + 1);
goto sentstring;
    }
    if (func == Th(z_executenamedcmd) && !statusline) {
while(func == Th(z_executenamedcmd))
func = executenamedcommand("execute: ");
if(!func)
func = t_undefinedkey;
else if(func != Th(z_executelastnamedcmd)) {
unrefthingy(lastnamed);
lastnamed = refthingy(func);
}
    }
    if (func == Th(z_executelastnamedcmd))
func = lastnamed;
    return func;
}

/**/
mod_export void
zlesetkeymap(int mode)
{
    Keymap km = openkeymap((mode == VIMODE) ? "viins" : "emacs");
    if (!km)
return;
    linkkeymap(km, "main", 0);
}

/**/
mod_export int
readcommand(UNUSED(char **args))
{
    Thingy thingy = getkeycmd();

    if (!thingy)
return 1;

    setsparam("REPLY", ztrdup(thingy->nam));
    return 0;
}
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