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sam.c
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sam.c
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/*
* Heavily inspired (and partially based upon) Rob Pike's sam text editor
* for Plan 9. Licensed under the Lucent Public License Version 1.02.
*
* Copyright © 2000-2009 Lucent Technologies
* Copyright © 2016 Marc André Tanner <mat at brain-dump.org>
*/
#include <string.h>
#include <strings.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include <limits.h>
#include "sam.h"
#include "vis-core.h"
#include "buffer.h"
#include "text.h"
#include "text-motions.h"
#include "text-objects.h"
#include "text-regex.h"
#include "util.h"
#define MAX_ARGV 8
typedef struct Address Address;
typedef struct Command Command;
typedef struct CommandDef CommandDef;
typedef struct { /* used to keep context when dealing with external proceses */
Vis *vis; /* editor instance */
Text *txt; /* text into which received data will be inserted */
size_t pos; /* position at which to insert new data */
} Filter;
struct Address {
char type; /* # (char) l (line) g (goto line) / ? . $ + - , ; % */
Regex *regex; /* NULL denotes default for x, y, X, and Y commands */
size_t number; /* line or character number */
Address *left; /* left hand side of a compound address , ; */
Address *right; /* either right hand side of a compound address or next address */
};
struct Command {
const char *argv[MAX_ARGV];/* [0]=cmd-name, [1..MAX_ARGV-2]=arguments, last element always NULL */
Address *address; /* range of text for command */
Regex *regex; /* regex to match, used by x, y, g, v, X, Y */
const CommandDef *cmddef; /* which command is this? */
int count; /* command count if any */
char flags; /* command specific flags */
Command *cmd; /* target of x, y, g, v, X, Y, { */
Command *next; /* next command in {} group */
};
struct CommandDef {
const char *name[3]; /* name and optional alias for the command */
enum {
CMD_CMD = 1 << 0, /* does the command take a sub/target command? */
CMD_REGEX = 1 << 1, /* regex after command? */
CMD_REGEX_DEFAULT = 1 << 2, /* is the regex optional i.e. can we use a default? */
CMD_COUNT = 1 << 3, /* does the command support a count as in s2/../? */
CMD_TEXT = 1 << 4, /* does the command need a text to insert? */
CMD_ADDRESS_NONE = 1 << 5, /* is it an error to specify an address for the command? */
CMD_ADDRESS_POS = 1 << 6, /* no address implies an empty range at current cursor position */
CMD_ADDRESS_LINE = 1 << 7, /* if no address is given, use the current line */
CMD_ADDRESS_AFTER = 1 << 8, /* if no address is given, begin at the start of the next line */
CMD_SHELL = 1 << 9, /* command needs a shell command as argument */
CMD_FILE = 1 << 10, /* does the command take a file name */
CMD_FORCE = 1 << 11, /* can the command be forced with ! */
CMD_ARGV = 1 << 12, /* whether shell like argument splitted is desired */
CMD_ONCE = 1 << 13, /* command should only be executed once, not for every selection */
} flags;
const char *defcmd; /* name of a default target command */
bool (*func)(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*); /* command implementation */
};
/* sam commands */
static bool cmd_insert(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_append(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_change(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_delete(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_guard(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_extract(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_select(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_print(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_files(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_pipein(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_pipeout(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_filter(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_launch(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_substitute(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_write(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_read(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_edit(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_quit(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_cd(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
/* vi(m) commands */
static bool cmd_set(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_open(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_bdelete(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_qall(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_split(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_vsplit(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_new(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_vnew(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_wq(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_earlier_later(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_help(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_map(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_unmap(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_langmap(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
static bool cmd_user(Vis*, Win*, Command*, const char *argv[], Cursor*, Filerange*);
/* command recognized at the ':'-prompt. commands are found using a unique
* prefix match. that is if a command should be available under an abbreviation
* which is a prefix for another command it has to be added as an alias. the
* long human readable name should always come first */
static const CommandDef cmds[] = {
/* name(s), flags, default command, implementation */
{ { "a" }, CMD_TEXT, NULL, cmd_append },
{ { "c" }, CMD_TEXT, NULL, cmd_change },
{ { "d" }, 0, NULL, cmd_delete },
{ { "g" }, CMD_CMD|CMD_REGEX, "p", cmd_guard },
{ { "i" }, CMD_TEXT, NULL, cmd_insert },
{ { "p" }, 0, NULL, cmd_print },
{ { "s" }, CMD_SHELL, NULL, cmd_substitute },
{ { "v" }, CMD_CMD|CMD_REGEX, "p", cmd_guard },
{ { "x" }, CMD_CMD|CMD_REGEX|CMD_REGEX_DEFAULT, "p", cmd_extract },
{ { "y" }, CMD_CMD|CMD_REGEX, "p", cmd_extract },
{ { "X" }, CMD_CMD|CMD_REGEX|CMD_REGEX_DEFAULT, NULL, cmd_files },
{ { "Y" }, CMD_CMD|CMD_REGEX, NULL, cmd_files },
{ { ">" }, CMD_SHELL|CMD_ADDRESS_LINE, NULL, cmd_pipeout },
{ { "<" }, CMD_SHELL|CMD_ADDRESS_POS, NULL, cmd_pipein },
{ { "|" }, CMD_SHELL|CMD_ADDRESS_POS, NULL, cmd_filter },
{ { "!" }, CMD_SHELL|CMD_ONCE, NULL, cmd_launch },
{ { "w" }, CMD_ARGV|CMD_FORCE|CMD_ADDRESS_NONE|CMD_ONCE, NULL, cmd_write},
{ { "r" }, CMD_FILE|CMD_ADDRESS_AFTER, NULL, cmd_read },
{ { "{" }, 0, NULL, NULL },
{ { "}" }, 0, NULL, NULL },
{ { "e" }, CMD_FILE|CMD_FORCE|CMD_ONCE, NULL, cmd_edit },
{ { "q" }, CMD_FORCE|CMD_ONCE, NULL, cmd_quit },
{ { "cd" }, CMD_ARGV|CMD_ONCE, NULL, cmd_cd },
/* vi(m) related commands */
{ { "bdelete" }, CMD_FORCE|CMD_ONCE, NULL, cmd_bdelete },
{ { "help" }, CMD_ONCE, NULL, cmd_help },
{ { "map" }, CMD_ARGV|CMD_FORCE|CMD_ONCE, NULL, cmd_map },
{ { "map-window" }, CMD_ARGV|CMD_FORCE|CMD_ONCE, NULL, cmd_map },
{ { "unmap" }, CMD_ARGV|CMD_ONCE, NULL, cmd_unmap },
{ { "unmap-window" }, CMD_ARGV|CMD_ONCE, NULL, cmd_unmap },
{ { "langmap" }, CMD_ARGV|CMD_FORCE|CMD_ONCE, NULL, cmd_langmap },
{ { "new" }, CMD_ARGV|CMD_ONCE, NULL, cmd_new },
{ { "open" }, CMD_ARGV|CMD_ONCE, NULL, cmd_open },
{ { "qall" }, CMD_FORCE|CMD_ONCE, NULL, cmd_qall },
{ { "set" }, CMD_ARGV|CMD_ONCE, NULL, cmd_set },
{ { "split" }, CMD_ARGV|CMD_ONCE, NULL, cmd_split },
{ { "vnew" }, CMD_ARGV|CMD_ONCE, NULL, cmd_vnew },
{ { "vsplit" }, CMD_ARGV|CMD_ONCE, NULL, cmd_vsplit },
{ { "wq" }, CMD_ARGV|CMD_FORCE|CMD_ADDRESS_NONE|CMD_ONCE, NULL, cmd_wq },
{ { "earlier" }, CMD_ARGV|CMD_ONCE, NULL, cmd_earlier_later },
{ { "later" }, CMD_ARGV|CMD_ONCE, NULL, cmd_earlier_later },
{ { NULL }, 0, NULL, NULL },
};
static const CommandDef cmddef_select =
{ { NULL }, 0, NULL, cmd_select };
static const CommandDef cmddef_user =
{ { NULL }, CMD_ARGV|CMD_FORCE|CMD_ONCE, NULL, cmd_user };
bool sam_init(Vis *vis) {
if (!(vis->cmds = map_new()))
return false;
bool ret = true;
for (const CommandDef *cmd = cmds; cmd && cmd->name[0]; cmd++) {
for (const char *const *name = cmd->name; *name; name++)
ret &= map_put(vis->cmds, *name, cmd);
}
return ret;
}
const char *sam_error(enum SamError err) {
static const char *error_msg[] = {
[SAM_ERR_OK] = "Success",
[SAM_ERR_MEMORY] = "Out of memory",
[SAM_ERR_ADDRESS] = "Bad address",
[SAM_ERR_NO_ADDRESS] = "Command takes no address",
[SAM_ERR_UNMATCHED_BRACE] = "Unmatched `}'",
[SAM_ERR_REGEX] = "Bad regular expression",
[SAM_ERR_TEXT] = "Bad text",
[SAM_ERR_FILENAME] = "Filename expected",
[SAM_ERR_COMMAND] = "Unknown command",
[SAM_ERR_EXECUTE] = "Error executing command",
};
return err < LENGTH(error_msg) ? error_msg[err] : NULL;
}
static Address *address_new(void) {
return calloc(1, sizeof(Address));
}
static void address_free(Address *addr) {
if (!addr)
return;
text_regex_free(addr->regex);
address_free(addr->left);
address_free(addr->right);
free(addr);
}
static void skip_spaces(const char **s) {
while (**s == ' ' || **s == '\t')
(*s)++;
}
static char *parse_delimited_text(const char **s) {
Buffer buf;
bool escaped = false;
char delim = **s;
if (!delim)
return NULL;
buffer_init(&buf);
for ((*s)++; **s && (**s != delim || escaped); (*s)++) {
if (!escaped && **s == '\\') {
escaped = true;
continue;
}
char c = **s;
if (escaped) {
escaped = false;
switch (**s) {
case '\n':
continue;
case 'n':
c = '\n';
break;
case 't':
c = '\t';
break;
default:
if (**s != '\\' && **s != delim)
buffer_append(&buf, "\\", 1);
break;
}
}
if (!buffer_append(&buf, &c, 1)) {
buffer_release(&buf);
return NULL;
}
}
if (**s == delim)
(*s)++;
if (!buffer_append(&buf, "\0", 1)) {
buffer_release(&buf);
return NULL;
}
return buf.data;
}
static char *parse_text(const char **s) {
skip_spaces(s);
if (**s != '\n')
return parse_delimited_text(s);
Buffer buf;
buffer_init(&buf);
const char *start = *s + 1;
bool dot = false;
for ((*s)++; **s && (!dot || **s != '\n'); (*s)++)
dot = (**s == '.');
if (!dot || !buffer_put(&buf, start, *s - start - 1) ||
!buffer_append(&buf, "\0", 1)) {
buffer_release(&buf);
return NULL;
}
return buf.data;
}
static char *parse_until(const char **s, const char *until) {
Buffer buf;
buffer_init(&buf);
size_t len = strlen(until);
while (**s && !memchr(until, **s, len))
buffer_append(&buf, (*s)++, 1);
if (buffer_length(&buf))
buffer_append(&buf, "\0", 1);
return buf.data;
}
static char *parse_shellcmd(const char **s) {
skip_spaces(s);
return parse_until(s, "\n");
}
static char *parse_filename(const char **s) {
skip_spaces(s);
if (**s == '"' || **s == '\'')
return parse_delimited_text(s);
return parse_until(s, "\n");
}
static void parse_argv(const char **s, const char *argv[], size_t maxarg) {
for (size_t i = 0; i < maxarg; i++) {
skip_spaces(s);
if (**s == '"' || **s == '\'')
argv[i] = parse_delimited_text(s);
else
argv[i] = parse_until(s, " \t\n");
}
}
static char *parse_cmdname(const char **s) {
skip_spaces(s);
Buffer buf;
buffer_init(&buf);
while (isalpha((unsigned char)**s) || **s == '-')
buffer_append(&buf, (*s)++, 1);
if (buffer_length(&buf))
buffer_append(&buf, "\0", 1);
return buf.data;
}
static Regex *parse_regex(Vis *vis, const char **s) {
char *pattern = parse_delimited_text(s);
if (!pattern)
return NULL;
Regex *regex = vis_regex(vis, *pattern ? pattern : NULL);
free(pattern);
return regex;
}
static int parse_number(const char **s) {
char *end = NULL;
int number = strtoull(*s, &end, 10);
if (end == *s)
return 1;
*s = end;
return number;
}
static Address *address_parse_simple(Vis *vis, const char **s, enum SamError *err) {
skip_spaces(s);
Address addr = {
.type = **s,
.regex = NULL,
.number = 0,
.left = NULL,
.right = NULL,
};
switch (addr.type) {
case '#': /* character #n */
(*s)++;
addr.number = parse_number(s);
break;
case '0': case '1': case '2': case '3': case '4': /* line n */
case '5': case '6': case '7': case '8': case '9':
addr.type = 'l';
addr.number = parse_number(s);
break;
case '/': /* regexp forwards */
case '?': /* regexp backwards */
addr.regex = parse_regex(vis, s);
if (!addr.regex) {
*err = SAM_ERR_REGEX;
return NULL;
}
break;
case '$': /* end of file */
case '.':
case '+':
case '-':
case '%':
(*s)++;
break;
default:
return NULL;
}
if ((addr.right = address_parse_simple(vis, s, err))) {
switch (addr.right->type) {
case '.':
case '$':
return NULL;
case '#':
case 'l':
case '/':
case '?':
if (addr.type != '+' && addr.type != '-') {
Address *plus = address_new();
if (!plus) {
address_free(addr.right);
return NULL;
}
plus->type = '+';
plus->right = addr.right;
addr.right = plus;
}
break;
}
}
Address *ret = address_new();
if (!ret) {
address_free(addr.right);
return NULL;
}
*ret = addr;
return ret;
}
static Address *address_parse_compound(Vis *vis, const char **s, enum SamError *err) {
Address addr = { 0 }, *left = address_parse_simple(vis, s, err), *right = NULL;
skip_spaces(s);
addr.type = **s;
switch (addr.type) {
case ',': /* a1,a2 */
case ';': /* a1;a2 */
(*s)++;
right = address_parse_compound(vis, s, err);
if (right && (right->type == ',' || right->type == ';') && !right->left) {
*err = SAM_ERR_ADDRESS;
goto fail;
}
break;
default:
return left;
}
addr.left = left;
addr.right = right;
Address *ret = address_new();
if (ret) {
*ret = addr;
return ret;
}
fail:
address_free(left);
address_free(right);
return NULL;
}
static Command *command_new(const char *name) {
Command *cmd = calloc(1, sizeof(Command));
if (!cmd)
return NULL;
if (name && !(cmd->argv[0] = strdup(name))) {
free(cmd);
return NULL;
}
return cmd;
}
static void command_free(Command *cmd) {
if (!cmd)
return;
for (Command *c = cmd->cmd, *next; c; c = next) {
next = c->next;
command_free(c);
}
for (const char **args = cmd->argv; *args; args++)
free((void*)*args);
address_free(cmd->address);
text_regex_free(cmd->regex);
free(cmd);
}
static const CommandDef *command_lookup(Vis *vis, const char *name) {
return map_closest(vis->cmds, name);
}
static Command *command_parse(Vis *vis, const char **s, int level, enum SamError *err) {
if (!**s) {
*err = SAM_ERR_COMMAND;
return NULL;
}
Command *cmd = command_new(NULL);
if (!cmd)
return NULL;
cmd->address = address_parse_compound(vis, s, err);
skip_spaces(s);
cmd->argv[0] = parse_cmdname(s);
if (!cmd->argv[0]) {
char name[2] = { **s ? **s : 'p', '\0' };
if (**s)
(*s)++;
if (!(cmd->argv[0] = strdup(name)))
goto fail;
}
const CommandDef *cmddef = command_lookup(vis, cmd->argv[0]);
if (!cmddef) {
*err = SAM_ERR_COMMAND;
goto fail;
}
cmd->cmddef = cmddef;
if (strcmp(cmd->argv[0], "{") == 0) {
Command *prev = NULL, *next;
do {
skip_spaces(s);
if (**s == '\n')
(*s)++;
next = command_parse(vis, s, level+1, err);
if (prev)
prev->next = next;
else
cmd->cmd = next;
} while ((prev = next));
} else if (strcmp(cmd->argv[0], "}") == 0) {
if (level == 0) {
*err = SAM_ERR_UNMATCHED_BRACE;
goto fail;
}
command_free(cmd);
return NULL;
}
if (cmddef->flags & CMD_ADDRESS_NONE && cmd->address) {
*err = SAM_ERR_NO_ADDRESS;
goto fail;
}
if (cmddef->flags & CMD_COUNT)
cmd->count = parse_number(s);
if (cmddef->flags & CMD_FORCE && **s == '!') {
cmd->flags = '!';
(*s)++;
}
if (cmddef->flags & CMD_FILE) {
if (!(cmd->argv[1] = parse_filename(s)) && cmd->argv[0][0] != 'w') {
*err = SAM_ERR_FILENAME;
goto fail;
}
}
if (cmddef->flags & CMD_REGEX) {
if ((cmddef->flags & CMD_REGEX_DEFAULT) && (!**s || **s == ' ')) {
skip_spaces(s);
} else if (!(cmd->regex = parse_regex(vis, s))) {
*err = SAM_ERR_REGEX;
goto fail;
}
}
if (cmddef->flags & CMD_SHELL && !(cmd->argv[1] = parse_shellcmd(s))) {
*err = SAM_ERR_SHELL;
goto fail;
}
if (cmddef->flags & CMD_TEXT && !(cmd->argv[1] = parse_text(s))) {
*err = SAM_ERR_TEXT;
goto fail;
}
if (cmddef->flags & CMD_ARGV) {
parse_argv(s, &cmd->argv[1], MAX_ARGV-2);
cmd->argv[MAX_ARGV-1] = NULL;
}
if (cmddef->flags & CMD_CMD) {
skip_spaces(s);
if (cmddef->defcmd && (**s == '\n' || **s == '\0')) {
if (**s == '\n')
(*s)++;
if (!(cmd->cmd = command_new(cmddef->defcmd)))
goto fail;
cmd->cmd->cmddef = command_lookup(vis, cmddef->defcmd);
} else {
if (!(cmd->cmd = command_parse(vis, s, level, err)))
goto fail;
if (strcmp(cmd->argv[0], "X") == 0 || strcmp(cmd->argv[0], "Y") == 0) {
Command *sel = command_new("s");
if (!sel)
goto fail;
sel->cmd = cmd->cmd;
sel->cmddef = &cmddef_select;
cmd->cmd = sel;
}
}
}
return cmd;
fail:
command_free(cmd);
return NULL;
}
static Command *sam_parse(Vis *vis, const char *cmd, enum SamError *err) {
const char **s = &cmd;
Command *c = command_parse(vis, s, 0, err);
if (!c)
return NULL;
Command *sel = command_new("s");
if (!sel) {
command_free(c);
return NULL;
}
sel->cmd = c;
sel->cmddef = &cmddef_select;
return sel;
}
static Filerange address_line_evaluate(Address *addr, File *file, Filerange *range, int sign) {
Text *txt = file->text;
size_t offset = addr->number != 0 ? addr->number : 1;
size_t start = range->start, end = range->end, line;
if (sign > 0) {
char c;
if (end > 0 && text_byte_get(txt, end-1, &c) && c == '\n')
end--;
line = text_lineno_by_pos(txt, end);
line = text_pos_by_lineno(txt, line + offset);
} else if (sign < 0) {
line = text_lineno_by_pos(txt, start);
line = offset < line ? text_pos_by_lineno(txt, line - offset) : 0;
} else {
line = text_pos_by_lineno(txt, addr->number);
}
if (addr->type == 'g')
return text_range_new(line, line);
else
return text_range_new(line, text_line_next(txt, line));
}
static Filerange address_evaluate(Address *addr, File *file, Filerange *range, int sign) {
Filerange ret = text_range_empty();
do {
switch (addr->type) {
case '#':
if (sign > 0)
ret.start = ret.end = range->end + addr->number;
else if (sign < 0)
ret.start = ret.end = range->start - addr->number;
else
ret = text_range_new(addr->number, addr->number);
break;
case 'l':
case 'g':
ret = address_line_evaluate(addr, file, range, sign);
break;
case '?':
sign = sign == 0 ? -1 : -sign;
/* fall through */
case '/':
if (sign >= 0)
ret = text_object_search_forward(file->text, range->end, addr->regex);
else
ret = text_object_search_backward(file->text, range->start, addr->regex);
break;
case '$':
{
size_t size = text_size(file->text);
ret = text_range_new(size, size);
break;
}
case '.':
ret = *range;
break;
case '+':
case '-':
sign = addr->type == '+' ? +1 : -1;
if (!addr->right || addr->right->type == '+' || addr->right->type == '-')
ret = address_line_evaluate(addr, file, range, sign);
break;
case ',':
case ';':
{
Filerange left, right;
if (addr->left)
left = address_evaluate(addr->left, file, range, 0);
else
left = text_range_new(0, 0);
if (addr->type == ';')
range = &left;
if (addr->right) {
right = address_evaluate(addr->right, file, range, 0);
} else {
size_t size = text_size(file->text);
right = text_range_new(size, size);
}
/* TODO: enforce strict ordering? */
return text_range_union(&left, &right);
}
case '%':
return text_range_new(0, text_size(file->text));
}
if (text_range_valid(&ret))
range = &ret;
} while ((addr = addr->right));
return ret;
}
static bool sam_execute(Vis *vis, Win *win, Command *cmd, Cursor *cur, Filerange *range) {
bool ret = true;
if (cmd->address && win)
*range = address_evaluate(cmd->address, win->file, range, 0);
switch (cmd->argv[0][0]) {
case '{':
{
if (!win) {
ret = false;
break;
}
Text *txt = win->file->text;
Mark start, end;
Filerange group = *range;
for (Command *c = cmd->cmd; c && ret; c = c->next) {
if (!text_range_valid(&group))
return false;
start = text_mark_set(txt, group.start);
end = text_mark_set(txt, group.end);
ret &= sam_execute(vis, win, c, NULL, &group);
size_t s = text_mark_get(txt, start);
/* hack to make delete work, only update if still valid */
if (s != EPOS)
group.start = s;
group.end = text_mark_get(txt, end);
}
break;
}
default:
ret = cmd->cmddef->func(vis, win, cmd, cmd->argv, cur, range);
break;
}
return ret;
}
enum SamError sam_cmd(Vis *vis, const char *s) {
enum SamError err = SAM_ERR_OK;
if (!s)
return err;
Command *cmd = sam_parse(vis, s, &err);
if (!cmd) {
if (err == SAM_ERR_OK)
err = SAM_ERR_MEMORY;
return err;
}
Filerange range = text_range_empty();
sam_execute(vis, vis->win, cmd, NULL, &range);
if (vis->win) {
bool completed = true;
for (Cursor *c = view_cursors(vis->win->view); c; c = view_cursors_next(c)) {
Filerange sel = view_cursors_selection_get(c);
if (text_range_valid(&sel)) {
completed = false;
break;
}
}
vis_mode_switch(vis, completed ? VIS_MODE_NORMAL : VIS_MODE_VISUAL);
}
command_free(cmd);
return err;
}
static bool cmd_insert(Vis *vis, Win *win, Command *cmd, const char *argv[], Cursor *cur, Filerange *range) {
if (!win)
return false;
size_t len = strlen(argv[1]);
bool ret = text_insert(win->file->text, range->start, argv[1], len);
if (ret)
*range = text_range_new(range->start, range->start + len);
return ret;
}
static bool cmd_append(Vis *vis, Win *win, Command *cmd, const char *argv[], Cursor *cur, Filerange *range) {
if (!win)
return false;
size_t len = strlen(argv[1]);
bool ret = text_insert(win->file->text, range->end, argv[1], len);
if (ret)
*range = text_range_new(range->end, range->end + len);
return ret;
}
static bool cmd_change(Vis *vis, Win *win, Command *cmd, const char *argv[], Cursor *cur, Filerange *range) {
if (!win)
return false;
Text *txt = win->file->text;
size_t len = strlen(argv[1]);
bool ret = text_delete(txt, range->start, text_range_size(range)) &&
text_insert(txt, range->start, argv[1], len);
if (ret)
*range = text_range_new(range->start, range->start + len);
return ret;
}
static bool cmd_delete(Vis *vis, Win *win, Command *cmd, const char *argv[], Cursor *cur, Filerange *range) {
if (!win)
return false;
bool ret = text_delete(win->file->text, range->start, text_range_size(range));
if (ret)
*range = text_range_new(range->start, range->start);
return ret;
}
static bool cmd_guard(Vis *vis, Win *win, Command *cmd, const char *argv[], Cursor *cur, Filerange *range) {
if (!win)
return false;
bool match = !text_search_range_forward(win->file->text, range->start,
text_range_size(range), cmd->regex, 0, NULL, 0);
if (match ^ (argv[0][0] == 'v'))
return sam_execute(vis, win, cmd->cmd, cur, range);
view_cursors_dispose(cur);
return true;
}
static bool cmd_extract(Vis *vis, Win *win, Command *cmd, const char *argv[], Cursor *cur, Filerange *range) {
if (!win)
return false;
bool ret = true;
Text *txt = win->file->text;
if (cmd->regex) {
size_t start = range->start, end = range->end, last_start = EPOS;
RegexMatch match[1];
while (start < end) {
bool found = text_search_range_forward(txt, start,
end - start, cmd->regex, 1, match,
start > range->start ? REG_NOTBOL : 0) == 0;
Filerange r = text_range_empty();
if (found) {
if (argv[0][0] == 'x')
r = text_range_new(match[0].start, match[0].end);
else
r = text_range_new(start, match[0].start);
if (match[0].start == match[0].end) {
if (last_start == match[0].start) {
start++;
continue;
}
/* in Plan 9's regexp library ^ matches the beginning
* of a line, however in POSIX with REG_NEWLINE ^
* matches the zero-length string immediately after a
* newline. Try filtering out the last such match at EOF.
*/
if (end == match[0].start && start > range->start)
break;
}
start = match[0].end;
} else {
if (argv[0][0] == 'y')
r = text_range_new(start, end);
start = end;
}
if (text_range_valid(&r)) {
Mark mark_start = text_mark_set(txt, start);
Mark mark_end = text_mark_set(txt, end);
ret &= sam_execute(vis, win, cmd->cmd, NULL, &r);
last_start = start = text_mark_get(txt, mark_start);
if (start == EPOS && last_start != r.end)
last_start = start = r.end;
end = text_mark_get(txt, mark_end);
if (start == EPOS || end == EPOS) {
ret = false;
break;
}
}
}
} else {
size_t start = range->start, end = range->end;
while (start < end) {
size_t next = text_line_next(txt, start);
if (next > end)
next = end;
Filerange r = text_range_new(start, next);
if (start == next || !text_range_valid(&r))
break;
start = next;
Mark mark_start = text_mark_set(txt, start);
Mark mark_end = text_mark_set(txt, end);
ret &= sam_execute(vis, win, cmd->cmd, NULL, &r);
start = text_mark_get(txt, mark_start);
if (start == EPOS)
start = r.end;
end = text_mark_get(txt, mark_end);
if (end == EPOS) {
ret = false;
break;
}
}
}
view_cursors_dispose(cur);
return ret;
}
static bool cmd_select(Vis *vis, Win *win, Command *cmd, const char *argv[], Cursor *cur, Filerange *range) {
Filerange sel = text_range_empty();
if (!win)
return sam_execute(vis, NULL, cmd->cmd, NULL, &sel);
bool ret = true;
View *view = win->view;
Text *txt = win->file->text;
bool multiple_cursors = view_cursors_multiple(view);
Cursor *primary = view_cursors_primary_get(view);
for (Cursor *c = view_cursors(view), *next; c && ret; c = next) {
next = view_cursors_next(c);
size_t pos = view_cursors_pos(c);
if (vis->mode->visual) {
sel = view_cursors_selection_get(c);
} else if (cmd->cmd->address) {
/* convert a single line range to a goto line motion */
if (!multiple_cursors && cmd->cmd->cmddef->func == cmd_print) {
Address *addr = cmd->cmd->address;
switch (addr->type) {
case '+':
case '-':
addr = addr->right;
/* fall through */
case 'l':
if (addr && addr->type == 'l' && !addr->right)
addr->type = 'g';
break;
}
}
sel = text_range_new(pos, pos);
} else if (cmd->cmd->cmddef->flags & CMD_ADDRESS_POS) {
sel = text_range_new(pos, pos);
} else if (cmd->cmd->cmddef->flags & CMD_ADDRESS_LINE) {
sel = text_object_line(txt, pos);
} else if (cmd->cmd->cmddef->flags & CMD_ADDRESS_AFTER) {
size_t next_line = text_line_next(txt, pos);
sel = text_range_new(next_line, next_line);
} else if (multiple_cursors) {
sel = text_object_line(txt, pos);
} else {
sel = text_range_new(0, text_size(txt));
}
if (text_range_valid(&sel))
ret &= sam_execute(vis, win, cmd->cmd, c, &sel);
if (cmd->cmd->cmddef->flags & CMD_ONCE)
break;
}
if (vis->win && vis->win->view == view && primary != view_cursors_primary_get(view))
view_cursors_primary_set(view_cursors(view));
return ret;
}
static bool cmd_print(Vis *vis, Win *win, Command *cmd, const char *argv[], Cursor *cur, Filerange *range) {
if (!win || !text_range_valid(range))
return false;
View *view = win->view;
Text *txt = win->file->text;
size_t pos = range->end;
if (range->start != range->end)
pos = text_char_prev(txt, pos);
if (cur)
view_cursors_to(cur, pos);
else
cur = view_cursors_new_force(view, pos);
if (cur) {
if (range->start != range->end)
view_cursors_selection_set(cur, range);
else