gri3-wm/src/config_parser.c

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#undef I3__FILE__
#define I3__FILE__ "config_parser.c"
/*
* vim:ts=4:sw=4:expandtab
*
* i3 - an improved dynamic tiling window manager
* © 2009-2013 Michael Stapelberg and contributors (see also: LICENSE)
*
* config_parser.c: hand-written parser to parse configuration directives.
*
* See also src/commands_parser.c for rationale on why we use a custom parser.
*
* This parser works VERY MUCH like src/commands_parser.c, so read that first.
* The differences are:
*
* 1. config_parser supports the 'number' token type (in addition to 'word' and
* 'string'). Numbers are referred to using &num (like $str).
*
* 2. Criteria are not executed immediately, they are just stored.
*
* 3. config_parser recognizes \n and \r as 'end' token, while commands_parser
* ignores them.
*
* 4. config_parser skips the current line on invalid inputs and follows the
* nearest <error> token.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdbool.h>
#include <stdint.h>
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#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "all.h"
// Macros to make the YAJL API a bit easier to use.
#define y(x, ...) yajl_gen_##x(command_output.json_gen, ##__VA_ARGS__)
#define ystr(str) yajl_gen_string(command_output.json_gen, (unsigned char *)str, strlen(str))
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#ifndef TEST_PARSER
pid_t config_error_nagbar_pid = -1;
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static struct context *context;
#endif
/*******************************************************************************
* The data structures used for parsing. Essentially the current state and a
* list of tokens for that state.
*
* The GENERATED_* files are generated by generate-commands-parser.pl with the
* input parser-specs/configs.spec.
******************************************************************************/
#include "GENERATED_config_enums.h"
typedef struct token {
char *name;
char *identifier;
/* This might be __CALL */
cmdp_state next_state;
union {
uint16_t call_identifier;
} extra;
} cmdp_token;
typedef struct tokenptr {
cmdp_token *array;
int n;
} cmdp_token_ptr;
#include "GENERATED_config_tokens.h"
/*******************************************************************************
* The (small) stack where identified literals are stored during the parsing
* of a single command (like $workspace).
******************************************************************************/
struct stack_entry {
/* Just a pointer, not dynamically allocated. */
const char *identifier;
enum {
STACK_STR = 0,
STACK_LONG = 1,
} type;
union {
char *str;
long num;
} val;
};
/* 10 entries should be enough for everybody. */
static struct stack_entry stack[10];
/*
* Pushes a string (identified by 'identifier') on the stack. We simply use a
* single array, since the number of entries we have to store is very small.
*
*/
static void push_string(const char *identifier, const char *str) {
for (int c = 0; c < 10; c++) {
if (stack[c].identifier != NULL &&
strcmp(stack[c].identifier, identifier) != 0)
continue;
if (stack[c].identifier == NULL) {
/* Found a free slot, lets store it here. */
stack[c].identifier = identifier;
stack[c].val.str = sstrdup(str);
stack[c].type = STACK_STR;
} else {
/* Append the value. */
char *prev = stack[c].val.str;
sasprintf(&(stack[c].val.str), "%s,%s", prev, str);
free(prev);
}
return;
}
/* When we arrive here, the stack is full. This should not happen and
* means theres either a bug in this parser or the specification
* contains a command with more than 10 identified tokens. */
fprintf(stderr, "BUG: commands_parser stack full. This means either a bug "
"in the code, or a new command which contains more than "
"10 identified tokens.\n");
exit(1);
}
static void push_long(const char *identifier, long num) {
for (int c = 0; c < 10; c++) {
if (stack[c].identifier != NULL)
continue;
/* Found a free slot, lets store it here. */
stack[c].identifier = identifier;
stack[c].val.num = num;
stack[c].type = STACK_LONG;
return;
}
/* When we arrive here, the stack is full. This should not happen and
* means theres either a bug in this parser or the specification
* contains a command with more than 10 identified tokens. */
fprintf(stderr, "BUG: commands_parser stack full. This means either a bug "
"in the code, or a new command which contains more than "
"10 identified tokens.\n");
exit(1);
}
static const char *get_string(const char *identifier) {
for (int c = 0; c < 10; c++) {
if (stack[c].identifier == NULL)
break;
if (strcmp(identifier, stack[c].identifier) == 0)
return stack[c].val.str;
}
return NULL;
}
static long get_long(const char *identifier) {
for (int c = 0; c < 10; c++) {
if (stack[c].identifier == NULL)
break;
if (strcmp(identifier, stack[c].identifier) == 0)
return stack[c].val.num;
}
return 0;
}
static void clear_stack(void) {
for (int c = 0; c < 10; c++) {
if (stack[c].type == STACK_STR && stack[c].val.str != NULL)
free(stack[c].val.str);
stack[c].identifier = NULL;
stack[c].val.str = NULL;
stack[c].val.num = 0;
}
}
// TODO: remove this if it turns out we dont need it for testing.
#if 0
/*******************************************************************************
* A dynamically growing linked list which holds the criteria for the current
* command.
******************************************************************************/
typedef struct criterion {
char *type;
char *value;
TAILQ_ENTRY(criterion) criteria;
} criterion;
static TAILQ_HEAD(criteria_head, criterion) criteria =
TAILQ_HEAD_INITIALIZER(criteria);
/*
* Stores the given type/value in the list of criteria.
* Accepts a pointer as first argument, since it is 'call'ed by the parser.
*
*/
static void push_criterion(void *unused_criteria, const char *type,
const char *value) {
struct criterion *criterion = malloc(sizeof(struct criterion));
criterion->type = strdup(type);
criterion->value = strdup(value);
TAILQ_INSERT_TAIL(&criteria, criterion, criteria);
}
/*
* Clears the criteria linked list.
* Accepts a pointer as first argument, since it is 'call'ed by the parser.
*
*/
static void clear_criteria(void *unused_criteria) {
struct criterion *criterion;
while (!TAILQ_EMPTY(&criteria)) {
criterion = TAILQ_FIRST(&criteria);
free(criterion->type);
free(criterion->value);
TAILQ_REMOVE(&criteria, criterion, criteria);
free(criterion);
}
}
#endif
/*******************************************************************************
* The parser itself.
******************************************************************************/
static cmdp_state state;
static Match current_match;
static struct ConfigResultIR subcommand_output;
static struct ConfigResultIR command_output;
/* A list which contains the states that lead to the current state, e.g.
* INITIAL, WORKSPACE_LAYOUT.
* When jumping back to INITIAL, statelist_idx will simply be set to 1
* (likewise for other states, e.g. MODE or BAR).
* This list is used to process the nearest error token. */
static cmdp_state statelist[10] = {INITIAL};
/* NB: statelist_idx points to where the next entry will be inserted */
static int statelist_idx = 1;
#include "GENERATED_config_call.h"
static void next_state(const cmdp_token *token) {
cmdp_state _next_state = token->next_state;
//printf("token = name %s identifier %s\n", token->name, token->identifier);
//printf("next_state = %d\n", token->next_state);
if (token->next_state == __CALL) {
subcommand_output.json_gen = command_output.json_gen;
GENERATED_call(token->extra.call_identifier, &subcommand_output);
_next_state = subcommand_output.next_state;
clear_stack();
}
state = _next_state;
if (state == INITIAL) {
clear_stack();
}
/* See if we are jumping back to a state in which we were in previously
* (statelist contains INITIAL) and just move statelist_idx accordingly. */
for (int i = 0; i < statelist_idx; i++) {
if (statelist[i] != _next_state)
continue;
statelist_idx = i + 1;
return;
}
/* Otherwise, the state is new and we add it to the list */
statelist[statelist_idx++] = _next_state;
}
/*
* Returns a pointer to the start of the line (one byte after the previous \r,
* \n) or the start of the input, if this is the first line.
*
*/
static const char *start_of_line(const char *walk, const char *beginning) {
while (*walk != '\n' && *walk != '\r' && walk >= beginning) {
walk--;
}
return walk + 1;
}
/*
* Copies the line and terminates it at the next \n, if any.
*
* The caller has to free() the result.
*
*/
static char *single_line(const char *start) {
char *result = sstrdup(start);
char *end = strchr(result, '\n');
if (end != NULL)
*end = '\0';
return result;
}
struct ConfigResultIR *parse_config(const char *input, struct context *context) {
/* Dump the entire config file into the debug log. We cannot just use
* DLOG("%s", input); because one log message must not exceed 4 KiB. */
const char *dumpwalk = input;
int linecnt = 1;
while (*dumpwalk != '\0') {
char *next_nl = strchr(dumpwalk, '\n');
if (next_nl != NULL) {
DLOG("CONFIG(line %3d): %.*s\n", linecnt, (int)(next_nl - dumpwalk), dumpwalk);
dumpwalk = next_nl + 1;
} else {
DLOG("CONFIG(line %3d): %s\n", linecnt, dumpwalk);
break;
}
linecnt++;
}
state = INITIAL;
statelist_idx = 1;
/* A YAJL JSON generator used for formatting replies. */
command_output.json_gen = yajl_gen_alloc(NULL);
y(array_open);
const char *walk = input;
const size_t len = strlen(input);
int c;
const cmdp_token *token;
bool token_handled;
linecnt = 1;
// TODO: make this testable
#ifndef TEST_PARSER
cfg_criteria_init(&current_match, &subcommand_output, INITIAL);
#endif
/* The "<=" operator is intentional: We also handle the terminating 0-byte
* explicitly by looking for an 'end' token. */
while ((size_t)(walk - input) <= len) {
/* Skip whitespace before every token, newlines are relevant since they
* separate configuration directives. */
while ((*walk == ' ' || *walk == '\t') && *walk != '\0')
walk++;
//printf("remaining input: %s\n", walk);
cmdp_token_ptr *ptr = &(tokens[state]);
token_handled = false;
for (c = 0; c < ptr->n; c++) {
token = &(ptr->array[c]);
/* A literal. */
if (token->name[0] == '\'') {
if (strncasecmp(walk, token->name + 1, strlen(token->name) - 1) == 0) {
if (token->identifier != NULL)
push_string(token->identifier, token->name + 1);
walk += strlen(token->name) - 1;
next_state(token);
token_handled = true;
break;
}
continue;
}
if (strcmp(token->name, "number") == 0) {
/* Handle numbers. We only accept decimal numbers for now. */
char *end = NULL;
errno = 0;
long int num = strtol(walk, &end, 10);
if ((errno == ERANGE && (num == LONG_MIN || num == LONG_MAX)) ||
(errno != 0 && num == 0))
continue;
/* No valid numbers found */
if (end == walk)
continue;
if (token->identifier != NULL)
push_long(token->identifier, num);
/* Set walk to the first non-number character */
walk = end;
next_state(token);
token_handled = true;
break;
}
if (strcmp(token->name, "string") == 0 ||
strcmp(token->name, "word") == 0) {
const char *beginning = walk;
/* Handle quoted strings (or words). */
if (*walk == '"') {
beginning++;
walk++;
while (*walk != '\0' && (*walk != '"' || *(walk - 1) == '\\'))
walk++;
} else {
if (token->name[0] == 's') {
while (*walk != '\0' && *walk != '\r' && *walk != '\n')
walk++;
} else {
/* For a word, the delimiters are white space (' ' or
* '\t'), closing square bracket (]), comma (,) and
* semicolon (;). */
while (*walk != ' ' && *walk != '\t' &&
*walk != ']' && *walk != ',' &&
*walk != ';' && *walk != '\r' &&
*walk != '\n' && *walk != '\0')
walk++;
}
}
if (walk != beginning) {
char *str = scalloc(walk - beginning + 1);
/* We copy manually to handle escaping of characters. */
int inpos, outpos;
for (inpos = 0, outpos = 0;
inpos < (walk - beginning);
inpos++, outpos++) {
/* We only handle escaped double quotes to not break
* backwards compatibility with people using \w in
* regular expressions etc. */
if (beginning[inpos] == '\\' && beginning[inpos + 1] == '"')
inpos++;
str[outpos] = beginning[inpos];
}
if (token->identifier)
push_string(token->identifier, str);
free(str);
/* If we are at the end of a quoted string, skip the ending
* double quote. */
if (*walk == '"')
walk++;
next_state(token);
token_handled = true;
break;
}
}
if (strcmp(token->name, "line") == 0) {
while (*walk != '\0' && *walk != '\n' && *walk != '\r')
walk++;
next_state(token);
token_handled = true;
linecnt++;
walk++;
break;
}
if (strcmp(token->name, "end") == 0) {
//printf("checking for end: *%s*\n", walk);
if (*walk == '\0' || *walk == '\n' || *walk == '\r') {
next_state(token);
token_handled = true;
/* To make sure we start with an appropriate matching
* datastructure for commands which do *not* specify any
* criteria, we re-initialize the criteria system after
* every command. */
// TODO: make this testable
#ifndef TEST_PARSER
cfg_criteria_init(&current_match, &subcommand_output, INITIAL);
#endif
linecnt++;
walk++;
break;
}
}
}
if (!token_handled) {
/* Figure out how much memory we will need to fill in the names of
* all tokens afterwards. */
int tokenlen = 0;
for (c = 0; c < ptr->n; c++)
tokenlen += strlen(ptr->array[c].name) + strlen("'', ");
/* Build up a decent error message. We include the problem, the
* full input, and underline the position where the parser
* currently is. */
char *errormessage;
char *possible_tokens = smalloc(tokenlen + 1);
char *tokenwalk = possible_tokens;
for (c = 0; c < ptr->n; c++) {
token = &(ptr->array[c]);
if (token->name[0] == '\'') {
/* A literal is copied to the error message enclosed with
* single quotes. */
*tokenwalk++ = '\'';
strcpy(tokenwalk, token->name + 1);
tokenwalk += strlen(token->name + 1);
*tokenwalk++ = '\'';
} else {
/* Skip error tokens in error messages, they are used
* internally only and might confuse users. */
if (strcmp(token->name, "error") == 0)
continue;
/* Any other token is copied to the error message enclosed
* with angle brackets. */
*tokenwalk++ = '<';
strcpy(tokenwalk, token->name);
tokenwalk += strlen(token->name);
*tokenwalk++ = '>';
}
if (c < (ptr->n - 1)) {
*tokenwalk++ = ',';
*tokenwalk++ = ' ';
}
}
*tokenwalk = '\0';
sasprintf(&errormessage, "Expected one of these tokens: %s",
possible_tokens);
free(possible_tokens);
/* Go back to the beginning of the line */
const char *error_line = start_of_line(walk, input);
/* Contains the same amount of characters as 'input' has, but with
* the unparseable part highlighted using ^ characters. */
char *position = scalloc(strlen(error_line) + 1);
const char *copywalk;
for (copywalk = error_line;
*copywalk != '\n' && *copywalk != '\r' && *copywalk != '\0';
copywalk++)
position[(copywalk - error_line)] = (copywalk >= walk ? '^' : (*copywalk == '\t' ? '\t' : ' '));
position[(copywalk - error_line)] = '\0';
ELOG("CONFIG: %s\n", errormessage);
ELOG("CONFIG: (in file %s)\n", context->filename);
char *error_copy = single_line(error_line);
/* Print context lines *before* the error, if any. */
if (linecnt > 1) {
const char *context_p1_start = start_of_line(error_line - 2, input);
char *context_p1_line = single_line(context_p1_start);
if (linecnt > 2) {
const char *context_p2_start = start_of_line(context_p1_start - 2, input);
char *context_p2_line = single_line(context_p2_start);
ELOG("CONFIG: Line %3d: %s\n", linecnt - 2, context_p2_line);
free(context_p2_line);
}
ELOG("CONFIG: Line %3d: %s\n", linecnt - 1, context_p1_line);
free(context_p1_line);
}
ELOG("CONFIG: Line %3d: %s\n", linecnt, error_copy);
ELOG("CONFIG: %s\n", position);
free(error_copy);
/* Print context lines *after* the error, if any. */
for (int i = 0; i < 2; i++) {
char *error_line_end = strchr(error_line, '\n');
if (error_line_end != NULL && *(error_line_end + 1) != '\0') {
error_line = error_line_end + 1;
error_copy = single_line(error_line);
ELOG("CONFIG: Line %3d: %s\n", linecnt + i + 1, error_copy);
free(error_copy);
}
}
context->has_errors = true;
/* Format this error message as a JSON reply. */
y(map_open);
ystr("success");
y(bool, false);
/* We set parse_error to true to distinguish this from other
* errors. i3-nagbar is spawned upon keypresses only for parser
* errors. */
ystr("parse_error");
y(bool, true);
ystr("error");
ystr(errormessage);
ystr("input");
ystr(input);
ystr("errorposition");
ystr(position);
y(map_close);
/* Skip the rest of this line, but continue parsing. */
while ((size_t)(walk - input) <= len && *walk != '\n')
walk++;
free(position);
free(errormessage);
clear_stack();
/* To figure out in which state to go (e.g. MODE or INITIAL),
* we find the nearest state which contains an <error> token
* and follow that one. */
bool error_token_found = false;
for (int i = statelist_idx - 1; (i >= 0) && !error_token_found; i--) {
cmdp_token_ptr *errptr = &(tokens[statelist[i]]);
for (int j = 0; j < errptr->n; j++) {
if (strcmp(errptr->array[j].name, "error") != 0)
continue;
next_state(&(errptr->array[j]));
error_token_found = true;
break;
}
}
assert(error_token_found);
}
}
y(array_close);
return &command_output;
}
/*******************************************************************************
* Code for building the stand-alone binary test.commands_parser which is used
* by t/187-commands-parser.t.
******************************************************************************/
#ifdef TEST_PARSER
/*
* Logs the given message to stdout while prefixing the current time to it,
* but only if debug logging was activated.
* This is to be called by DLOG() which includes filename/linenumber
*
*/
void debuglog(char *fmt, ...) {
va_list args;
va_start(args, fmt);
fprintf(stdout, "# ");
vfprintf(stdout, fmt, args);
va_end(args);
}
void errorlog(char *fmt, ...) {
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
}
static int criteria_next_state;
void cfg_criteria_init(I3_CFG, int _state) {
criteria_next_state = _state;
}
void cfg_criteria_add(I3_CFG, const char *ctype, const char *cvalue) {
}
void cfg_criteria_pop_state(I3_CFG) {
result->next_state = criteria_next_state;
}
int main(int argc, char *argv[]) {
if (argc < 2) {
fprintf(stderr, "Syntax: %s <command>\n", argv[0]);
return 1;
}
struct context context;
context.filename = "<stdin>";
parse_config(argv[1], &context);
}
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#else
/*
* Goes through each line of buf (separated by \n) and checks for statements /
* commands which only occur in i3 v4 configuration files. If it finds any, it
* returns version 4, otherwise it returns version 3.
*
*/
static int detect_version(char *buf) {
char *walk = buf;
char *line = buf;
while (*walk != '\0') {
if (*walk != '\n') {
walk++;
continue;
}
/* check for some v4-only statements */
if (strncasecmp(line, "bindcode", strlen("bindcode")) == 0 ||
strncasecmp(line, "force_focus_wrapping", strlen("force_focus_wrapping")) == 0 ||
strncasecmp(line, "# i3 config file (v4)", strlen("# i3 config file (v4)")) == 0 ||
strncasecmp(line, "workspace_layout", strlen("workspace_layout")) == 0) {
LOG("deciding for version 4 due to this line: %.*s\n", (int)(walk - line), line);
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return 4;
}
/* if this is a bind statement, we can check the command */
if (strncasecmp(line, "bind", strlen("bind")) == 0) {
char *bind = strchr(line, ' ');
if (bind == NULL)
goto next;
while ((*bind == ' ' || *bind == '\t') && *bind != '\0')
bind++;
if (*bind == '\0')
goto next;
if ((bind = strchr(bind, ' ')) == NULL)
goto next;
while ((*bind == ' ' || *bind == '\t') && *bind != '\0')
bind++;
if (*bind == '\0')
goto next;
if (strncasecmp(bind, "layout", strlen("layout")) == 0 ||
strncasecmp(bind, "floating", strlen("floating")) == 0 ||
strncasecmp(bind, "workspace", strlen("workspace")) == 0 ||
strncasecmp(bind, "focus left", strlen("focus left")) == 0 ||
strncasecmp(bind, "focus right", strlen("focus right")) == 0 ||
strncasecmp(bind, "focus up", strlen("focus up")) == 0 ||
strncasecmp(bind, "focus down", strlen("focus down")) == 0 ||
strncasecmp(bind, "border normal", strlen("border normal")) == 0 ||
strncasecmp(bind, "border 1pixel", strlen("border 1pixel")) == 0 ||
strncasecmp(bind, "border pixel", strlen("border pixel")) == 0 ||
strncasecmp(bind, "border borderless", strlen("border borderless")) == 0 ||
strncasecmp(bind, "--no-startup-id", strlen("--no-startup-id")) == 0 ||
strncasecmp(bind, "bar", strlen("bar")) == 0) {
LOG("deciding for version 4 due to this line: %.*s\n", (int)(walk - line), line);
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return 4;
}
}
next:
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/* advance to the next line */
walk++;
line = walk;
}
return 3;
}
/*
* Calls i3-migrate-config-to-v4 to migrate a configuration file (input
* buffer).
*
* Returns the converted config file or NULL if there was an error (for
* example the script could not be found in $PATH or the i3 executables
* directory).
*
*/
static char *migrate_config(char *input, off_t size) {
int writepipe[2];
int readpipe[2];
if (pipe(writepipe) != 0 ||
pipe(readpipe) != 0) {
warn("migrate_config: Could not create pipes");
return NULL;
}
pid_t pid = fork();
if (pid == -1) {
warn("Could not fork()");
return NULL;
}
/* child */
if (pid == 0) {
/* close writing end of writepipe, connect reading side to stdin */
close(writepipe[1]);
dup2(writepipe[0], 0);
/* close reading end of readpipe, connect writing side to stdout */
close(readpipe[0]);
dup2(readpipe[1], 1);
static char *argv[] = {
NULL, /* will be replaced by the executable path */
NULL};
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exec_i3_utility("i3-migrate-config-to-v4", argv);
}
/* parent */
/* close reading end of the writepipe (connected to the scripts stdin) */
close(writepipe[0]);
/* write the whole config file to the pipe, the script will read everything
* immediately */
int written = 0;
int ret;
while (written < size) {
if ((ret = write(writepipe[1], input + written, size - written)) < 0) {
warn("Could not write to pipe");
return NULL;
}
written += ret;
}
close(writepipe[1]);
/* close writing end of the readpipe (connected to the scripts stdout) */
close(readpipe[1]);
/* read the scripts output */
int conv_size = 65535;
char *converted = malloc(conv_size);
int read_bytes = 0;
do {
if (read_bytes == conv_size) {
conv_size += 65535;
converted = realloc(converted, conv_size);
}
ret = read(readpipe[0], converted + read_bytes, conv_size - read_bytes);
if (ret == -1) {
warn("Cannot read from pipe");
FREE(converted);
return NULL;
}
read_bytes += ret;
} while (ret > 0);
/* get the returncode */
int status;
wait(&status);
if (!WIFEXITED(status)) {
fprintf(stderr, "Child did not terminate normally, using old config file (will lead to broken behaviour)\n");
return NULL;
}
int returncode = WEXITSTATUS(status);
if (returncode != 0) {
fprintf(stderr, "Migration process exit code was != 0\n");
if (returncode == 2) {
fprintf(stderr, "could not start the migration script\n");
/* TODO: script was not found. tell the user to fix his system or create a v4 config */
} else if (returncode == 1) {
fprintf(stderr, "This already was a v4 config. Please add the following line to your config file:\n");
fprintf(stderr, "# i3 config file (v4)\n");
/* TODO: nag the user with a message to include a hint for i3 in his config file */
}
return NULL;
}
return converted;
}
/*
* Parses the given file by first replacing the variables, then calling
* parse_config and possibly launching i3-nagbar.
*
*/
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void parse_file(const char *f) {
SLIST_HEAD(variables_head, Variable) variables = SLIST_HEAD_INITIALIZER(&variables);
int fd, ret, read_bytes = 0;
struct stat stbuf;
char *buf;
FILE *fstr;
char buffer[1026], key[512], value[512];
if ((fd = open(f, O_RDONLY)) == -1)
die("Could not open configuration file: %s\n", strerror(errno));
if (fstat(fd, &stbuf) == -1)
die("Could not fstat file: %s\n", strerror(errno));
buf = scalloc((stbuf.st_size + 1) * sizeof(char));
while (read_bytes < stbuf.st_size) {
if ((ret = read(fd, buf + read_bytes, (stbuf.st_size - read_bytes))) < 0)
die("Could not read(): %s\n", strerror(errno));
read_bytes += ret;
}
if (lseek(fd, 0, SEEK_SET) == (off_t)-1)
die("Could not lseek: %s\n", strerror(errno));
if ((fstr = fdopen(fd, "r")) == NULL)
die("Could not fdopen: %s\n", strerror(errno));
while (!feof(fstr)) {
if (fgets(buffer, 1024, fstr) == NULL) {
if (feof(fstr))
break;
die("Could not read configuration file\n");
}
/* sscanf implicitly strips whitespace. Also, we skip comments and empty lines. */
if (sscanf(buffer, "%s %[^\n]", key, value) < 1 ||
key[0] == '#' || strlen(key) < 3)
continue;
if (strcasecmp(key, "set") == 0) {
if (value[0] != '$') {
ELOG("Malformed variable assignment, name has to start with $\n");
continue;
}
/* get key/value for this variable */
char *v_key = value, *v_value;
if (strstr(value, " ") == NULL && strstr(value, "\t") == NULL) {
ELOG("Malformed variable assignment, need a value\n");
continue;
}
if (!(v_value = strstr(value, " ")))
v_value = strstr(value, "\t");
*(v_value++) = '\0';
while (*v_value == '\t' || *v_value == ' ')
v_value++;
struct Variable *new = scalloc(sizeof(struct Variable));
new->key = sstrdup(v_key);
new->value = sstrdup(v_value);
SLIST_INSERT_HEAD(&variables, new, variables);
DLOG("Got new variable %s = %s\n", v_key, v_value);
continue;
}
}
fclose(fstr);
/* For every custom variable, see how often it occurs in the file and
* how much extra bytes it requires when replaced. */
struct Variable *current, *nearest;
int extra_bytes = 0;
/* We need to copy the buffer because we need to invalidate the
* variables (otherwise we will count them twice, which is bad when
* 'extra' is negative) */
char *bufcopy = sstrdup(buf);
SLIST_FOREACH (current, &variables, variables) {
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int extra = (strlen(current->value) - strlen(current->key));
char *next;
for (next = bufcopy;
next < (bufcopy + stbuf.st_size) &&
(next = strcasestr(next, current->key)) != NULL;
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next += strlen(current->key)) {
*next = '_';
extra_bytes += extra;
}
}
FREE(bufcopy);
/* Then, allocate a new buffer and copy the file over to the new one,
* but replace occurences of our variables */
char *walk = buf, *destwalk;
char *new = smalloc((stbuf.st_size + extra_bytes + 1) * sizeof(char));
destwalk = new;
while (walk < (buf + stbuf.st_size)) {
/* Find the next variable */
SLIST_FOREACH (current, &variables, variables)
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current->next_match = strcasestr(walk, current->key);
nearest = NULL;
int distance = stbuf.st_size;
SLIST_FOREACH (current, &variables, variables) {
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if (current->next_match == NULL)
continue;
if ((current->next_match - walk) < distance) {
distance = (current->next_match - walk);
nearest = current;
}
}
if (nearest == NULL) {
/* If there are no more variables, we just copy the rest */
strncpy(destwalk, walk, (buf + stbuf.st_size) - walk);
destwalk += (buf + stbuf.st_size) - walk;
*destwalk = '\0';
break;
} else {
/* Copy until the next variable, then copy its value */
strncpy(destwalk, walk, distance);
strncpy(destwalk + distance, nearest->value, strlen(nearest->value));
walk += distance + strlen(nearest->key);
destwalk += distance + strlen(nearest->value);
}
}
/* analyze the string to find out whether this is an old config file (3.x)
* or a new config file (4.x). If its old, we run the converter script. */
int version = detect_version(buf);
if (version == 3) {
/* We need to convert this v3 configuration */
char *converted = migrate_config(new, stbuf.st_size);
if (converted != NULL) {
ELOG("\n");
ELOG("****************************************************************\n");
ELOG("NOTE: Automatically converted configuration file from v3 to v4.\n");
ELOG("\n");
ELOG("Please convert your config file to v4. You can use this command:\n");
ELOG(" mv %s %s.O\n", f, f);
ELOG(" i3-migrate-config-to-v4 %s.O > %s\n", f, f);
ELOG("****************************************************************\n");
ELOG("\n");
free(new);
new = converted;
} else {
LOG("\n");
LOG("**********************************************************************\n");
LOG("ERROR: Could not convert config file. Maybe i3-migrate-config-to-v4\n");
LOG("was not correctly installed on your system?\n");
LOG("**********************************************************************\n");
LOG("\n");
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}
}
context = scalloc(sizeof(struct context));
context->filename = f;
struct ConfigResultIR *config_output = parse_config(new, context);
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yajl_gen_free(config_output->json_gen);
check_for_duplicate_bindings(context);
if (context->has_errors || context->has_warnings) {
ELOG("FYI: You are using i3 version " I3_VERSION "\n");
if (version == 3)
ELOG("Please convert your configfile first, then fix any remaining errors (see above).\n");
char *editaction,
*pageraction;
sasprintf(&editaction, "i3-sensible-editor \"%s\" && i3-msg reload\n", f);
sasprintf(&pageraction, "i3-sensible-pager \"%s\"\n", errorfilename);
char *argv[] = {
NULL, /* will be replaced by the executable path */
"-f",
(config.font.pattern ? config.font.pattern : "fixed"),
"-t",
(context->has_errors ? "error" : "warning"),
"-m",
(context->has_errors ? "You have an error in your i3 config file!" : "Your config is outdated. Please fix the warnings to make sure everything works."),
"-b",
"edit config",
editaction,
(errorfilename ? "-b" : NULL),
(context->has_errors ? "show errors" : "show warnings"),
pageraction,
NULL};
start_nagbar(&config_error_nagbar_pid, argv);
free(editaction);
free(pageraction);
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}
FREE(context->line_copy);
free(context);
free(new);
free(buf);
while (!SLIST_EMPTY(&variables)) {
current = SLIST_FIRST(&variables);
FREE(current->key);
FREE(current->value);
SLIST_REMOVE_HEAD(&variables, variables);
FREE(current);
}
}
#endif