/* ex.c */
/* Author:
* Steve Kirkendall
* 14407 SW Teal Blvd. #C
* Beaverton, OR 97005
* kirkenda@cs.pdx.edu
*/
/* This file contains the code for reading ex commands. */
#include "config.h"
#include "ctype.h"
#include "vi.h"
/* This data type is used to describe the possible argument combinations */
typedef short ARGT;
#define FROM 1 /* allow a linespec */
#define TO 2 /* allow a second linespec */
#define BANG 4 /* allow a ! after the command name */
#define EXTRA 8 /* allow extra args after command name */
#define XFILE 16 /* expand wildcards in extra part */
#define NOSPC 32 /* no spaces allowed in the extra part */
#define DFLALL 64 /* default file range is 1,$ */
#define DFLNONE 128 /* no default file range */
#define NODFL 256 /* do not default to the current file name */
#define EXRCOK 512 /* can be in a .exrc file */
#define NL 1024 /* if mode!=MODE_EX, then write a newline first */
#define PLUS 2048 /* allow a line number, as in ":e +32 foo" */
#define ZERO 4096 /* allow 0 to be given as a line number */
#define NOBAR 8192 /* treat following '|' chars as normal */
#define FILES (XFILE + EXTRA) /* multiple extra files allowed */
#define WORD1 (EXTRA + NOSPC) /* one extra word allowed */
#define FILE1 (FILES + NOSPC) /* 1 file allowed, defaults to current file */
#define NAMEDF (FILE1 + NODFL) /* 1 file allowed, defaults to "" */
#define NAMEDFS (FILES + NODFL) /* multiple files allowed, default is "" */
#define RANGE (FROM + TO) /* range of linespecs allowed */
#define NONE 0 /* no args allowed at all */
/* This array maps ex command names to command codes. The order in which
* command names are listed below is significant -- ambiguous abbreviations
* are always resolved to be the first possible match. (e.g. "r" is taken
* to mean "read", not "rewind", because "read" comes before "rewind")
*/
static struct
{
char *name; /* name of the command */
CMD code; /* enum code of the command */
void (*fn)();/* function which executes the command */
ARGT argt; /* command line arguments permitted/needed/used */
}
cmdnames[] =
{ /* cmd name cmd code function arguments */
{"print", CMD_PRINT, cmd_print, RANGE+NL },
{"append", CMD_APPEND, cmd_append, FROM+ZERO+BANG },
#ifdef DEBUG
{"bug", CMD_DEBUG, cmd_debug, RANGE+BANG+EXTRA+NL},
#endif
{"change", CMD_CHANGE, cmd_append, RANGE+BANG },
{"delete", CMD_DELETE, cmd_delete, RANGE+WORD1 },
{"file", CMD_FILE, cmd_file, NONE },
{"global", CMD_GLOBAL, cmd_global, RANGE+BANG+EXTRA+DFLALL+NOBAR},
{"insert", CMD_INSERT, cmd_append, FROM+BANG },
{"join", CMD_INSERT, cmd_join, RANGE+BANG },
{"k", CMD_MARK, cmd_mark, FROM+WORD1 },
{"list", CMD_LIST, cmd_print, RANGE+NL },
{"move", CMD_MOVE, cmd_move, RANGE+EXTRA },
{"next", CMD_NEXT, cmd_next, BANG },
{"Next", CMD_PREVIOUS, cmd_next, BANG },
{"quit", CMD_QUIT, cmd_xit, BANG },
{"substitute", CMD_SUBSTITUTE, cmd_substitute, RANGE+EXTRA },
{"to", CMD_COPY, cmd_move, RANGE+EXTRA },
{"undo", CMD_UNDO, cmd_undo, NONE },
{"vglobal", CMD_VGLOBAL, cmd_global, RANGE+EXTRA+DFLALL+NOBAR},
{"write", CMD_WRITE, cmd_write, RANGE+BANG+DFLALL},
{"xit", CMD_XIT, cmd_xit, BANG+NL },
{"yank", CMD_YANK, cmd_delete, RANGE+WORD1 },
{"!", CMD_BANG, cmd_shell, EXRCOK+RANGE+NAMEDFS+DFLNONE+NL+NOBAR},
{"#", CMD_NUMBER, cmd_print, RANGE+NL },
{"<", CMD_SHIFTL, cmd_shift, RANGE },
{">", CMD_SHIFTR, cmd_shift, RANGE },
{"=", CMD_EQUAL, cmd_file, RANGE },
{"&", CMD_SUBAGAIN, cmd_substitute, RANGE },
#ifndef NO_AT
{"@", CMD_AT, cmd_at, EXTRA },
#endif
#ifndef NO_ABBR
{"abbreviate", CMD_ABBR, cmd_map, EXRCOK+BANG+EXTRA},
#endif
{"args", CMD_ARGS, cmd_args, EXRCOK },
#ifndef NO_ERRLIST
#endif
{"copy", CMD_COPY, cmd_move, RANGE+EXTRA },
#ifndef NO_DIGRAPH
{"digraph", CMD_DIGRAPH, cmd_digraph, EXRCOK+BANG+EXTRA},
#endif
{"mark", CMD_MARK, cmd_mark, FROM+WORD1 },
#ifndef NO_MKEXRC
{"mkexrc", CMD_MKEXRC, cmd_mkexrc, NONE },
#endif
{"number", CMD_NUMBER, cmd_print, RANGE+NL },
#ifndef NO_TAGSTACK
{"pop", CMD_POP, cmd_pop, BANG+WORD1 },
#endif
{"put", CMD_PUT, cmd_put, FROM+ZERO+WORD1 },
{"set", CMD_SET, cmd_set, EXRCOK+EXTRA },
{"shell", CMD_SHELL, cmd_shell, NL },
/* better to not have this, unless someone thinks up a use for it */
/* maybe for the patch program? .. nah.. */
/* {"source", CMD_SOURCE, cmd_source, EXRCOK+NAMEDF },*/
#ifdef SIGTSTP
{"stop", CMD_STOP, cmd_suspend, NONE },
#endif
{"version", CMD_VERSION, cmd_version, EXRCOK+NONE },
{"wq", CMD_WQUIT, cmd_xit, NL },
#ifdef DEBUG
{"debug", CMD_DEBUG, cmd_debug, RANGE+BANG+EXTRA+NL},
{"validate", CMD_VALIDATE, cmd_validate, BANG+NL },
#endif
#ifndef NO_COLOR
{"color", CMD_COLOR, cmd_color, EXRCOK+EXTRA },
#endif
{"map", CMD_MAP, cmd_map, EXRCOK+BANG+EXTRA},
{"previous", CMD_PREVIOUS, cmd_next, BANG },
{"rewind", CMD_REWIND, cmd_next, BANG },
#ifdef SIGTSTP
{"suspend", CMD_SUSPEND, cmd_suspend, NONE },
#endif
{"unmap", CMD_UNMAP, cmd_map, EXRCOK+BANG+EXTRA},
#ifndef NO_ABBR
{"unabbreviate",CMD_UNABBR, cmd_map, EXRCOK+WORD1 },
#endif
{(char *)0}
};
/* This function parses a search pattern - given a pointer to a / or ?,
* it replaces the ending / or ? with a \0, and returns a pointer to the
* stuff that came after the pattern.
*/
char *parseptrn(ptrn)
REG char *ptrn;
{
REG char *scan;
for (scan = ptrn + 1;
*scan && *scan != *ptrn;
scan++)
{
/* allow backslashed versions of / and ? in the pattern */
if (*scan == '\\' && scan[1] != '\0')
{
scan++;
}
}
if (*scan)
{
*scan++ = '\0';
}
return scan;
}
/* This function parses a line specifier for ex commands */
char *linespec(s, markptr)
REG char *s; /* start of the line specifier */
MARK *markptr; /* where to store the mark's value */
{
long num;
REG char *t;
/* parse each ;-delimited clause of this linespec */
do
{
/* skip an initial ';', if any */
if (*s == ';')
{
s++;
}
/* skip leading spaces */
while (isspace(*s))
{
s++;
}
/* dot means current position */
if (*s == '.')
{
s++;
*markptr = cursor;
}
/* '$' means the last line */
else if (*s == '$')
{
s++;
*markptr = MARK_LAST;
}
/* digit means an absolute line number */
else if (isdigit(*s))
{
for (num = 0; isdigit(*s); s++)
{
num = num * 10 + *s - '0';
}
*markptr = MARK_AT_LINE(num);
}
/* appostrophe means go to a set mark */
else if (*s == '\'')
{
s++;
*markptr = m_tomark(cursor, 1L, (int)*s);
s++;
}
/* slash means do a search */
else if (*s == '/' || *s == '?')
{
/* put a '\0' at the end of the search pattern */
t = parseptrn(s);
/* search for the pattern */
*markptr &= ~(BLKSIZE - 1);
if (*s == '/')
{
pfetch(markline(*markptr));
if (plen > 0)
*markptr += plen - 1;
*markptr = m_fsrch(*markptr, s);
}
else
{
*markptr = m_bsrch(*markptr, s);
}
/* adjust command string pointer */
s = t;
}
/* if linespec was faulty, quit now */
if (!*markptr)
{
return s;
}
/* maybe add an offset */
t = s;
if (*t == '-' || *t == '+')
{
s++;
for (num = 0; isdigit(*s); s++)
{
num = num * 10 + *s - '0';
}
if (num == 0)
{
num = 1;
}
*markptr = m_updnto(*markptr, num, *t);
}
} while (*s == ';' || *s == '+' || *s == '-');
/* protect against invalid line numbers */
num = markline(*markptr);
if (num < 1L || num > nlines)
{
msg("Invalid line number -- must be from 1 to %ld", nlines);
*markptr = MARK_UNSET;
}
return s;
}
/* This function reads an ex command and executes it. */
void ex()
{
char cmdbuf[150];
REG int cmdlen;
static long oldline;
significant = FALSE;
oldline = markline(cursor);
while (mode == MODE_EX)
{
/* read a line */
#ifdef CRUNCH
cmdlen = vgets(':', cmdbuf, sizeof(cmdbuf));
#else
cmdlen = vgets(*o_prompt ? ':' : '\0', cmdbuf, sizeof(cmdbuf));
#endif
if (cmdlen < 0)
{
return;
}
/* if empty line, assume ".+1" */
if (cmdlen == 0)
{
strcpy(cmdbuf, ".+1");
qaddch('\r');
clrtoeol();
}
else
{
addch('\n');
}
refresh();
/* parse & execute the command */
doexcmd(cmdbuf);
/* handle autoprint */
if (significant || markline(cursor) != oldline)
{
significant = FALSE;
oldline = markline(cursor);
if (*o_autoprint && mode == MODE_EX)
{
cmd_print(cursor, cursor, CMD_PRINT, FALSE, "");
}
}
}
}
void doexcmd(cmdbuf)
char *cmdbuf; /* string containing an ex command */
{
REG char *scan; /* used to scan thru cmdbuf */
MARK frommark; /* first linespec */
MARK tomark; /* second linespec */
REG int cmdlen; /* length of the command name given */
CMD cmd; /* what command is this? */
ARGT argt; /* argument types for this command */
short forceit; /* bang version of a command? */
REG int cmdidx; /* index of command */
REG char *build; /* used while copying filenames */
int iswild; /* boolean: filenames use wildcards? */
int isdfl; /* using default line ranges? */
int didsub; /* did we substitute file names for % or # */
/* ex commands can't be undone via the shift-U command */
U_line = 0L;
/* permit extra colons at the start of the line */
for (; *cmdbuf == ':'; cmdbuf++)
{
}
/* ignore command lines that start with a double-quote */
if (*cmdbuf == '"')
{
return;
}
scan = cmdbuf;
/* parse the line specifier */
if (nlines < 1)
{
/* no file, so don't allow addresses */
}
else if (*scan == '%')
{
/* '%' means all lines */
frommark = MARK_FIRST;
tomark = MARK_LAST;
scan++;
}
else if (*scan == '0')
{
scan++;
frommark = tomark = (*scan ? MARK_UNSET : MARK_FIRST);
}
else
{
frommark = cursor;
scan = linespec(scan, &frommark);
tomark = frommark;
if (frommark && *scan == ',')
{
scan++;
scan = linespec(scan, &tomark);
}
if (!tomark)
{
/* faulty line spec -- fault already described */
return;
}
if (frommark > tomark)
{
msg("first address exceeds the second");
return;
}
}
isdfl = (scan == cmdbuf);
/* skip whitespace */
while (isspace(*scan))
{
scan++;
}
/* Figure out how long the command name is. If no command, then the
* length is 0, which will match the "print" command.
*/
if (!*scan)
{
/* if not in ex mode, and both endpoints are at the line,
* then just move to the start of that line without printing
*/
if (mode != MODE_EX && frommark == tomark)
{
if (tomark != MARK_UNSET)
cursor = tomark;
return;
}
cmdlen = 0;
}
else if (!isalpha(*scan))
{
cmdlen = 1;
}
else
{
for (cmdlen = 1;
isalpha(scan[cmdlen]);
cmdlen++)
{
}
}
/* lookup the command code */
for (cmdidx = 0;
cmdnames[cmdidx].name && strncmp(scan, cmdnames[cmdidx].name, cmdlen);
cmdidx++)
{
}
argt = cmdnames[cmdidx].argt;
cmd = cmdnames[cmdidx].code;
if (cmd == CMD_NULL)
{
msg("Unknown command \"%.*s\"", cmdlen, scan);
return;
}
/* !!! if the command doesn't have NOBAR set, then replace | with \0 */
/* if the command ended with a bang, set the forceit flag */
scan += cmdlen;
if ((argt & BANG) && *scan == '!')
{
scan++;
forceit = 1;
}
else
{
forceit = 0;
}
/* skip any more whitespace, to leave scan pointing to arguments */
while (isspace(*scan))
{
scan++;
}
/* a couple of special cases for filenames */
if (argt & XFILE)
{
/* if names were given, process them */
if (*scan)
{
for (build = tmpblk.c, iswild = didsub = FALSE; *scan; scan++)
{
switch (*scan)
{
case '\\':
if (scan[1] == '\\' || scan[1] == '%' || scan[1] == '#')
{
*build++ = *++scan;
}
else
{
*build++ = '\\';
}
break;
case '%':
if (!*origname)
{
msg("No filename to substitute for %%");
return;
}
strcpy(build, origname);
while (*build)
{
build++;
}
didsub = TRUE;
break;
case '#':
if (!*prevorig)
{
msg("No filename to substitute for #");
return;
}
strcpy(build, prevorig);
while (*build)
{
build++;
}
didsub = TRUE;
break;
case '*':
case '?':
#if !(MSDOS || TOS)
case '[':
case '`':
case '{': /* } */
case '$':
case '~':
#endif
*build++ = *scan;
iswild = TRUE;
break;
default:
*build++ = *scan;
}
}
*build = '\0';
if (cmd == CMD_BANG
|| cmd == CMD_READ && tmpblk.c[0] == '!'
|| cmd == CMD_WRITE && tmpblk.c[0] == '!')
{
if (didsub)
{
if (mode != MODE_EX)
{
addch('\n');
}
addstr(tmpblk.c);
addch('\n');
exrefresh();
}
}
else
{
if (iswild && tmpblk.c[0] != '>')
{
scan = wildcard(tmpblk.c);
}
}
}
else /* no names given, maybe assume origname */
{
if (!(argt & NODFL))
{
strcpy(tmpblk.c, origname);
}
else
{
*tmpblk.c = '\0';
}
}
scan = tmpblk.c;
}
/* bad arguments? */
if (!(argt & EXRCOK) && nlines < 1L)
{
msg("Can't use the \"%s\" command in a %s file", cmdnames[cmdidx].name, EXRC);
return;
}
if (!(argt & (ZERO | EXRCOK)) && frommark == MARK_UNSET)
{
msg("Can't use address 0 with \"%s\" command.", cmdnames[cmdidx].name);
return;
}
if (!(argt & FROM) && frommark != cursor && nlines >= 1L)
{
msg("Can't use address with \"%s\" command.", cmdnames[cmdidx].name);
return;
}
if (!(argt & TO) && tomark != frommark && nlines >= 1L)
{
msg("Can't use a range with \"%s\" command.", cmdnames[cmdidx].name);
return;
}
if (!(argt & EXTRA) && *scan)
{
msg("Extra characters after \"%s\" command.", cmdnames[cmdidx].name);
return;
}
if ((argt & NOSPC) && !(cmd == CMD_READ && (forceit || *scan == '!')))
{
build = scan;
#ifndef CRUNCH
if ((argt & PLUS) && *build == '+')
{
while (*build && !isspace(*build))
{
build++;
}
while (*build && isspace(*build))
{
build++;
}
}
#endif /* not CRUNCH */
for (; *build; build++)
{
if (isspace(*build))
{
msg("Too many %s to \"%s\" command.",
(argt & XFILE) ? "filenames" : "arguments",
cmdnames[cmdidx].name);
return;
}
}
}
/* some commands have special default ranges */
if (isdfl && (argt & DFLALL))
{
frommark = MARK_FIRST;
tomark = MARK_LAST;
}
else if (isdfl && (argt & DFLNONE))
{
frommark = tomark = 0L;
}
/* write a newline if called from visual mode */
if ((argt & NL) && mode != MODE_EX && !exwrote)
{
addch('\n');
exrefresh();
}
/* act on the command */
(*cmdnames[cmdidx].fn)(frommark, tomark, cmd, forceit, scan);
}
/* This function executes EX commands from a file. It returns 1 normally, or
* 0 if the file could not be opened for reading.
*/
int doexrc(filename)
char *filename; /* name of a ".exrc" file */
{
int fd; /* file descriptor */
int len; /* length of the ".exrc" file */
#ifdef CRUNCH
/* small address space - we need to conserve space */
/* !!! kludge: we use U_text as the buffer. This has the side-effect
* of interfering with the shift-U visual command. Disable shift-U.
*/
U_line = 0L;
#else
# if TINYSTACK
# if TOS || MINT
/* small stack, but big heap. Allocate buffer from heap */
char *U_text = (char *)malloc(4096);
if (!U_text)
{
return 0;
}
# else
/* small stack - we need to conserve space */
/* !!! kludge: we use U_text as the buffer. This has the side-effect
* of interfering with the shift-U visual command. Disable shift-U.
*/
U_line = 0L;
# endif
# else
/* This is how we would *like* to do it -- with a large buffer on the
* stack, so we can handle large .exrc files and also recursion.
*/
char U_text[4096];
# endif
#endif
/* open the file, read it, and close */
fd = open(filename, O_RDONLY);
if (fd < 0)
{
#if TINYSTACK && (TOS || MINT)
free(U_text);
#endif
return 0;
}
#if TINYSTACK && (TOS || MINT)
len = tread(fd, U_text, 4096);
#else
len = tread(fd, U_text, sizeof U_text);
#endif
close(fd);
/* execute the string */
exstring(U_text, len, ctrl('V'));
#if TINYSTACK && (TOS || MINT)
free(U_text);
#endif
return 1;
}
/* This function executes EX commands from a string. The commands may be
* separated by newlines or by | characters. It also handles quoting.
* Each individual command is limited to 132 bytes, but the total string
* may be longer.
*/
void exstring(buf, len, qchar)
char *buf; /* the commands to execute */
int len; /* the length of the string */
int qchar; /* the quote character -- ^V for file, or \ for kbd */
{
char single[133]; /* a single command */
char *src, *dest;
int i;
/* find & do each command */
for (src = buf; src < &buf[len]; src++)
{
/* Copy a single command into single[]. Convert any quoted |
* into a normal |, and stop at a newline or unquoted |.
*/
for (dest = single, i = 0;
i < 132 && src < &buf[len] && *src != '\n' && *src != '|';
src++, i++)
{
if (src[0] == qchar && src[1] == '|')
{
src++;
}
*dest++ = *src;
}
*dest = '\0';
/* do it */
doexcmd(single);
}
}