rofi/source/helper.c

/*
 * rofi
 *
 * MIT/X11 License
 * Copyright © 2012 Sean Pringle <sean.pringle@gmail.com>
 * Copyright © 2013-2022 Qball Cow <qball@gmpclient.org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

/** The log domain for this helper. */
#define G_LOG_DOMAIN "Helper"

#include "config.h"
#include "display.h"
#include "helper-theme.h"
#include "rofi.h"
#include "settings.h"
#include "view.h"
#include "xcb.h"
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <glib.h>
#include <glib/gstdio.h>
#include <limits.h>
#include <pango/pango-fontmap.h>
#include <pango/pango.h>
#include <pango/pangocairo.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

/**
 * Textual description of positioning rofi.
 */
const char *const monitor_position_entries[] = {
    "on focused monitor", "on focused window", "at mouse pointer",
    "on monitor with focused window", "on monitor that has mouse pointer"};
/** copy of the argc for use in commandline argument parser. */
int stored_argc = 0;
/** copy of the argv pointer for use in the commandline argument parser */
char **stored_argv = NULL;

char *helper_string_replace_if_exists_v(char *string, GHashTable *h);

void cmd_set_arguments(int argc, char **argv) {
  stored_argc = argc;
  stored_argv = argv;
}

int helper_parse_setup(char *string, char ***output, int *length, ...) {
  GError *error = NULL;
  GHashTable *h;
  h = g_hash_table_new(g_str_hash, g_str_equal);
  // By default, we insert terminal and ssh-client
  g_hash_table_insert(h, "{terminal}", config.terminal_emulator);
  g_hash_table_insert(h, "{ssh-client}", config.ssh_client);
  // Add list from variable arguments.
  va_list ap;
  va_start(ap, length);
  while (1) {
    char *key = va_arg(ap, char *);
    if (key == (char *)0) {
      break;
    }
    char *value = va_arg(ap, char *);
    if (value == (char *)0) {
      break;
    }
    g_hash_table_insert(h, key, value);
  }
  va_end(ap);

  char *res = helper_string_replace_if_exists_v(string, h);
  // Destroy key-value storage.
  g_hash_table_destroy(h);
  // Parse the string into shell arguments.
  if (g_shell_parse_argv(res, length, output, &error)) {
    g_free(res);
    return TRUE;
  }
  g_free(res);
  // Throw error if shell parsing fails.
  if (error) {
    char *msg = g_strdup_printf("Failed to parse: '%s'\nError: '%s'", string,
                                error->message);
    rofi_view_error_dialog(msg, FALSE);
    g_free(msg);
    // print error.
    g_error_free(error);
  }
  return FALSE;
}

void helper_tokenize_free(rofi_int_matcher **tokens) {
  for (size_t i = 0; tokens && tokens[i]; i++) {
    g_regex_unref((GRegex *)tokens[i]->regex);
    g_free(tokens[i]);
  }
  g_free(tokens);
}

static gchar *glob_to_regex(const char *input) {
  gchar *r = g_regex_escape_string(input, -1);
  size_t str_l = strlen(r);
  for (size_t i = 0; i < str_l; i++) {
    if (r[i] == '\\') {
      if (r[i + 1] == '*') {
        r[i] = '.';
      } else if (r[i + 1] == '?') {
        r[i + 1] = 'S';
      }
      i++;
    }
  }
  return r;
}
static gchar *fuzzy_to_regex(const char *input) {
  GString *str = g_string_new("");
  gchar *r = g_regex_escape_string(input, -1);
  gchar *iter;
  int first = 1;
  for (iter = r; iter && *iter != '\0'; iter = g_utf8_next_char(iter)) {
    if (first) {
      g_string_append(str, "(");
    } else {
      g_string_append(str, ".*?(");
    }
    if (*iter == '\\') {
      g_string_append_c(str, '\\');
      iter = g_utf8_next_char(iter);
      // If EOL, break out of for loop.
      if ((*iter) == '\0') {
        break;
      }
    }
    g_string_append_unichar(str, g_utf8_get_char(iter));
    g_string_append(str, ")");
    first = 0;
  }
  g_free(r);
  char *retv = str->str;
  g_string_free(str, FALSE);
  return retv;
}

static gchar *prefix_regex(const char *input) {
  gchar *r = g_regex_escape_string(input, -1);
  char *retv = g_strconcat("\\b", r, NULL);
  g_free(r);
  return retv;
}

static char *utf8_helper_simplify_string(const char *s) {
  gunichar buf2[G_UNICHAR_MAX_DECOMPOSITION_LENGTH] = {
      0,
  };
  char buf[6] = {
      0,
  };
  // Compose the string in maximally composed form.
  ssize_t str_size = (g_utf8_strlen(s, -1) * 6 + 2 + 1) * sizeof(char);
  char *str = g_malloc0(str_size);
  char *striter = str;
  for (const char *iter = s; iter && *iter; iter = g_utf8_next_char(iter)) {
    gunichar uc = g_utf8_get_char(iter);
    int l = 0;
    gsize dl = g_unichar_fully_decompose(uc, FALSE, buf2,
                                         G_UNICHAR_MAX_DECOMPOSITION_LENGTH);
    if (dl) {
      l = g_unichar_to_utf8(buf2[0], buf);
    } else {
      l = g_unichar_to_utf8(uc, buf);
    }
    memcpy(striter, buf, l);
    striter += l;
  }

  return str;
}

// Macro for quickly generating regex for matching.
static inline GRegex *R(const char *s, int case_sensitive) {
  if (config.normalize_match) {
    char *str = utf8_helper_simplify_string(s);

    GRegex *r = g_regex_new(
        str, G_REGEX_OPTIMIZE | ((case_sensitive) ? 0 : G_REGEX_CASELESS), 0,
        NULL);

    g_free(str);
    return r;
  }
  return g_regex_new(
      s, G_REGEX_OPTIMIZE | ((case_sensitive) ? 0 : G_REGEX_CASELESS), 0, NULL);
}

static rofi_int_matcher *create_regex(const char *input, int case_sensitive) {
  GRegex *retv = NULL;
  gchar *r;
  rofi_int_matcher *rv = g_malloc0(sizeof(rofi_int_matcher));
  if (input && input[0] == config.matching_negate_char) {
    rv->invert = 1;
    input++;
  }
  switch (config.matching_method) {
  case MM_GLOB:
    r = glob_to_regex(input);
    retv = R(r, case_sensitive);
    g_free(r);
    break;
  case MM_REGEX:
    retv = R(input, case_sensitive);
    if (retv == NULL) {
      r = g_regex_escape_string(input, -1);
      retv = R(r, case_sensitive);
      g_free(r);
    }
    break;
  case MM_FUZZY:
    r = fuzzy_to_regex(input);
    retv = R(r, case_sensitive);
    g_free(r);
    break;
  case MM_PREFIX:
    r = prefix_regex(input);
    retv = R(r, case_sensitive);
    g_free(r);
    break;
  default:
    r = g_regex_escape_string(input, -1);
    retv = R(r, case_sensitive);
    g_free(r);
    break;
  }
  rv->regex = retv;
  return rv;
}
rofi_int_matcher **helper_tokenize(const char *input, int case_sensitive) {
  if (input == NULL) {
    return NULL;
  }
  size_t len = strlen(input);
  if (len == 0) {
    return NULL;
  }

  char *saveptr = NULL, *token;
  rofi_int_matcher **retv = NULL;
  if (!config.tokenize) {
    retv = g_malloc0(sizeof(rofi_int_matcher *) * 2);
    retv[0] = create_regex(input, case_sensitive);
    return retv;
  }

  // First entry is always full (modified) stringtext.
  int num_tokens = 0;

  // Copy the string, 'strtok_r' modifies it.
  char *str = g_strdup(input);

  // Iterate over tokens.
  // strtok should still be valid for utf8.
  const char *const sep = " ";
  for (token = strtok_r(str, sep, &saveptr); token != NULL;
       token = strtok_r(NULL, sep, &saveptr)) {
    retv = g_realloc(retv, sizeof(rofi_int_matcher *) * (num_tokens + 2));
    retv[num_tokens] = create_regex(token, case_sensitive);
    retv[num_tokens + 1] = NULL;
    num_tokens++;
  }
  // Free str.
  g_free(str);
  return retv;
}

// cli arg handling
int find_arg(const char *const key) {
  int i;

  for (i = 0; i < stored_argc && strcasecmp(stored_argv[i], key); i++) {
    ;
  }

  return i < stored_argc ? i : -1;
}
int find_arg_str(const char *const key, char **val) {
  int i = find_arg(key);

  if (val != NULL && i > 0 && i < stored_argc - 1) {
    *val = stored_argv[i + 1];
    return TRUE;
  }
  return FALSE;
}

const char **find_arg_strv(const char *const key) {
  const char **retv = NULL;
  int length = 0;
  for (int i = 0; i < stored_argc; i++) {
    if (i < (stored_argc - 1) && strcasecmp(stored_argv[i], key) == 0) {
      length++;
    }
  }
  if (length > 0) {
    retv = g_malloc0((length + 1) * sizeof(char *));
    int index = 0;
    for (int i = 0; i < stored_argc; i++) {
      if (i < (stored_argc - 1) && strcasecmp(stored_argv[i], key) == 0) {
        retv[index++] = stored_argv[i + 1];
      }
    }
  }
  return retv;
}

int find_arg_int(const char *const key, int *val) {
  int i = find_arg(key);

  if (val != NULL && i > 0 && i < (stored_argc - 1)) {
    *val = strtol(stored_argv[i + 1], NULL, 10);
    return TRUE;
  }
  return FALSE;
}
int find_arg_uint(const char *const key, unsigned int *val) {
  int i = find_arg(key);

  if (val != NULL && i > 0 && i < (stored_argc - 1)) {
    *val = strtoul(stored_argv[i + 1], NULL, 10);
    return TRUE;
  }
  return FALSE;
}

char helper_parse_char(const char *arg) {
  const size_t len = strlen(arg);
  // If the length is 1, it is not escaped.
  if (len == 1) {
    return arg[0];
  }
  // If the length is 2 and the first character is '\', we unescape it.
  if (len == 2 && arg[0] == '\\') {
    switch (arg[1]) {
    // New line
    case 'n':
      return '\n';
    // Bell
    case 'a':
      return '\a';
    // Backspace
    case 'b':
      return '\b';
    // Tab
    case 't':
      return '\t';
    // Vertical tab
    case 'v':
      return '\v';
    // Form feed
    case 'f':
      return '\f';
    // Carriage return
    case 'r':
      return '\r';
    // Forward slash
    case '\\':
      return '\\';
    // 0 line.
    case '0':
      return '\0';
    default:
      break;
    }
  }
  if (len > 2 && arg[0] == '\\' && arg[1] == 'x') {
    return (char)strtol(&arg[2], NULL, 16);
  }
  g_warning("Failed to parse character string: \"%s\"", arg);
  // for now default to newline.
  return '\n';
}

int find_arg_char(const char *const key, char *val) {
  int i = find_arg(key);

  if (val != NULL && i > 0 && i < (stored_argc - 1)) {
    *val = helper_parse_char(stored_argv[i + 1]);
    return TRUE;
  }
  return FALSE;
}

PangoAttrList *helper_token_match_get_pango_attr(RofiHighlightColorStyle th,
                                                 rofi_int_matcher **tokens,
                                                 const char *input,
                                                 PangoAttrList *retv) {
  // Disable highlighting for normalize match, not supported atm.
  if (config.normalize_match) {
    return retv;
  }
  // Do a tokenized match.
  if (tokens) {
    for (int j = 0; tokens[j]; j++) {
      GMatchInfo *gmi = NULL;
      if (tokens[j]->invert) {
        continue;
      }
      g_regex_match(tokens[j]->regex, input, G_REGEX_MATCH_PARTIAL, &gmi);
      while (g_match_info_matches(gmi)) {
        int count = g_match_info_get_match_count(gmi);
        for (int index = (count > 1) ? 1 : 0; index < count; index++) {
          int start, end;
          g_match_info_fetch_pos(gmi, index, &start, &end);
          if (th.style & ROFI_HL_BOLD) {
            PangoAttribute *pa = pango_attr_weight_new(PANGO_WEIGHT_BOLD);
            pa->start_index = start;
            pa->end_index = end;
            pango_attr_list_insert(retv, pa);
          }
          if (th.style & ROFI_HL_UNDERLINE) {
            PangoAttribute *pa =
                pango_attr_underline_new(PANGO_UNDERLINE_SINGLE);
            pa->start_index = start;
            pa->end_index = end;
            pango_attr_list_insert(retv, pa);
          }
          if (th.style & ROFI_HL_STRIKETHROUGH) {
            PangoAttribute *pa = pango_attr_strikethrough_new(TRUE);
            pa->start_index = start;
            pa->end_index = end;
            pango_attr_list_insert(retv, pa);
          }
          if (th.style & ROFI_HL_SMALL_CAPS) {
            PangoAttribute *pa =
                pango_attr_variant_new(PANGO_VARIANT_SMALL_CAPS);
            pa->start_index = start;
            pa->end_index = end;
            pango_attr_list_insert(retv, pa);
          }
          if (th.style & ROFI_HL_ITALIC) {
            PangoAttribute *pa = pango_attr_style_new(PANGO_STYLE_ITALIC);
            pa->start_index = start;
            pa->end_index = end;
            pango_attr_list_insert(retv, pa);
          }
          if (th.style & ROFI_HL_COLOR) {
            PangoAttribute *pa = pango_attr_foreground_new(
                th.color.red * 65535, th.color.green * 65535,
                th.color.blue * 65535);
            pa->start_index = start;
            pa->end_index = end;
            pango_attr_list_insert(retv, pa);

            if (th.color.alpha < 1.0) {
              pa = pango_attr_foreground_alpha_new(th.color.alpha * 65535);
              pa->start_index = start;
              pa->end_index = end;
              pango_attr_list_insert(retv, pa);
            }
          }
        }
        g_match_info_next(gmi, NULL);
      }
      g_match_info_free(gmi);
    }
  }
  return retv;
}

int helper_token_match(rofi_int_matcher *const *tokens, const char *input) {
  int match = TRUE;
  // Do a tokenized match.
  if (tokens) {
    if (config.normalize_match) {
      char *r = utf8_helper_simplify_string(input);
      for (int j = 0; match && tokens[j]; j++) {
        match = g_regex_match(tokens[j]->regex, r, 0, NULL);
        match ^= tokens[j]->invert;
      }
      g_free(r);
    } else {
      for (int j = 0; match && tokens[j]; j++) {
        match = g_regex_match(tokens[j]->regex, input, 0, NULL);
        match ^= tokens[j]->invert;
      }
    }
  }
  return match;
}

int execute_generator(const char *cmd) {
  char **args = NULL;
  int argv = 0;
  helper_parse_setup(config.run_command, &args, &argv, "{cmd}", cmd, (char *)0);

  int fd = -1;
  GError *error = NULL;
  g_spawn_async_with_pipes(NULL, args, NULL, G_SPAWN_SEARCH_PATH, NULL, NULL,
                           NULL, NULL, &fd, NULL, &error);

  if (error != NULL) {
    char *msg = g_strdup_printf("Failed to execute: '%s'\nError: '%s'", cmd,
                                error->message);
    rofi_view_error_dialog(msg, FALSE);
    g_free(msg);
    // print error.
    g_error_free(error);
    fd = -1;
  }
  g_strfreev(args);
  return fd;
}

int create_pid_file(const char *pidfile, gboolean kill_running) {
  if (pidfile == NULL) {
    return -1;
  }

  int fd = g_open(pidfile, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
  if (fd < 0) {
    g_warning("Failed to create pid file: '%s'.", pidfile);
    return -1;
  }
  // Set it to close the File Descriptor on exit.
  int flags = fcntl(fd, F_GETFD, NULL);
  flags = flags | FD_CLOEXEC;
  if (fcntl(fd, F_SETFD, flags, NULL) < 0) {
    g_warning("Failed to set CLOEXEC on pidfile.");
    remove_pid_file(fd);
    return -1;
  }
  // Try to get exclusive write lock on FD
  int retv = flock(fd, LOCK_EX | LOCK_NB);
  if (retv != 0) {
    g_warning("Failed to set lock on pidfile: Rofi already running?");
    g_warning("Got error: %d %s", retv, g_strerror(errno));
    if (kill_running) {
      char buffer[64] = {
          0,
      };
      ssize_t l = read(fd, &buffer, 64);
      if (l > 1) {
        pid_t pid = g_ascii_strtoll(buffer, NULL, 0);
        kill(pid, SIGTERM);
        while (1) {
          retv = flock(fd, LOCK_EX | LOCK_NB);
          if (retv == 0) {
            break;
          }
          g_usleep(100);
        }
      }
      remove_pid_file(fd);
      return create_pid_file(pidfile, FALSE);
    }

    remove_pid_file(fd);
    return -1;
  }
  if (ftruncate(fd, (off_t)0) == 0) {
    // Write pid, not needed, but for completeness sake.
    char buffer[64];
    int length = snprintf(buffer, 64, "%i", getpid());
    ssize_t l = 0;
    while (l < length) {
      l += write(fd, &buffer[l], length - l);
    }
  }
  return fd;
}

void remove_pid_file(int fd) {
  if (fd >= 0) {
    if (close(fd)) {
      g_warning("Failed to close pidfile: '%s'", g_strerror(errno));
    }
  }
}

gboolean helper_validate_font(PangoFontDescription *pfd, const char *font) {
  const char *fam = pango_font_description_get_family(pfd);
  int size = pango_font_description_get_size(pfd);
  if (fam == NULL || size == 0) {
    g_debug("Pango failed to parse font: '%s'", font);
    g_debug("Got family: <b>%s</b> at size: <b>%d</b>", fam ? fam : "{unknown}",
            size);
    return FALSE;
  }
  return TRUE;
}

/**
 * Do some input validation, especially the first few could break things.
 * It is good to catch them beforehand.
 *
 * This functions exits the program with 1 when it finds an invalid
 * configuration.
 */
int config_sanity_check(void) {
  int found_error = FALSE;
  GString *msg =
      g_string_new("<big><b>The configuration failed to validate:</b></big>\n");

  if (config.sorting_method) {
    if (g_strcmp0(config.sorting_method, "normal") == 0) {
      config.sorting_method_enum = SORT_NORMAL;
    } else if (g_strcmp0(config.sorting_method, "levenshtein") == 0) {
      config.sorting_method_enum = SORT_NORMAL;
    } else if (g_strcmp0(config.sorting_method, "fzf") == 0) {
      config.sorting_method_enum = SORT_FZF;
    } else {
      g_string_append_printf(
          msg,
          "\t<b>config.sorting_method</b>=%s is not a valid sorting "
          "strategy.\nValid options are: normal or fzf.\n",
          config.sorting_method);
      found_error = 1;
    }
  }

  if (config.matching) {
    if (g_strcmp0(config.matching, "regex") == 0) {
      config.matching_method = MM_REGEX;
    } else if (g_strcmp0(config.matching, "glob") == 0) {
      config.matching_method = MM_GLOB;
    } else if (g_strcmp0(config.matching, "fuzzy") == 0) {
      config.matching_method = MM_FUZZY;
    } else if (g_strcmp0(config.matching, "normal") == 0) {
      config.matching_method = MM_NORMAL;
      ;
    } else if (g_strcmp0(config.matching, "prefix") == 0) {
      config.matching_method = MM_PREFIX;
    } else {
      g_string_append_printf(msg,
                             "\t<b>config.matching</b>=%s is not a valid "
                             "matching strategy.\nValid options are: glob, "
                             "regex, fuzzy, prefix or normal.\n",
                             config.matching);
      found_error = 1;
    }
  }

  if (config.element_height < 1) {
    g_string_append_printf(msg,
                           "\t<b>config.element_height</b>=%d is invalid. An "
                           "element needs to be at least 1 line high.\n",
                           config.element_height);
    config.element_height = 1;
    found_error = TRUE;
  }
  if (!(config.location >= 0 && config.location <= 8)) {
    g_string_append_printf(msg,
                           "\t<b>config.location</b>=%d is invalid. Value "
                           "should be between %d and %d.\n",
                           config.location, 0, 8);
    config.location = WL_CENTER;
    found_error = 1;
  }

  // Check size
  {
    workarea mon;
    if (!monitor_active(&mon)) {
      const char *name = config.monitor;
      if (name && name[0] == '-') {
        int index = name[1] - '0';
        if (index < 5 && index > 0) {
          name = monitor_position_entries[index - 1];
        }
      }
      g_string_append_printf(
          msg, "\t<b>config.monitor</b>=%s Could not find monitor.\n", name);
      found_error = TRUE;
    }
  }

  if (g_strcmp0(config.monitor, "-3") == 0) {
    // On -3, set to location 1.
    config.location = 1;
  }

  if (found_error) {
    g_string_append(msg, "Please update your configuration.");
    rofi_add_error_message(msg);
    return TRUE;
  }

  g_string_free(msg, TRUE);
  return FALSE;
}

char *rofi_expand_path(const char *input) {
  char **str = g_strsplit(input, G_DIR_SEPARATOR_S, -1);
  for (unsigned int i = 0; str && str[i]; i++) {
    // Replace ~ with current user homedir.
    if (str[i][0] == '~' && str[i][1] == '\0') {
      g_free(str[i]);
      str[i] = g_strdup(g_get_home_dir());
    }
    // If other user, ask getpwnam.
    else if (str[i][0] == '~') {
      struct passwd *p = getpwnam(&(str[i][1]));
      if (p != NULL) {
        g_free(str[i]);
        str[i] = g_strdup(p->pw_dir);
      }
    } else if (i == 0) {
      char *s = str[i];
      if (input[0] == G_DIR_SEPARATOR) {
        str[i] = g_strdup_printf("%s%s", G_DIR_SEPARATOR_S, s);
        g_free(s);
      }
    }
  }
  char *retv = g_build_filenamev(str);
  g_strfreev(str);
  return retv;
}

/** Return the minimum value of a,b,c */
#define MIN3(a, b, c)                                                          \
  ((a) < (b) ? ((a) < (c) ? (a) : (c)) : ((b) < (c) ? (b) : (c)))

unsigned int levenshtein(const char *needle, const glong needlelen,
                         const char *haystack, const glong haystacklen) {
  if (needlelen == G_MAXLONG) {
    // String to long, we cannot handle this.
    return UINT_MAX;
  }
  unsigned int column[needlelen + 1];
  for (glong y = 0; y < needlelen; y++) {
    column[y] = y;
  }
  // Removed out of the loop, otherwise static code analyzers think it is
  // unset.. silly but true. old loop: for ( glong y = 0; y <= needlelen; y++)
  column[needlelen] = needlelen;
  for (glong x = 1; x <= haystacklen; x++) {
    const char *needles = needle;
    column[0] = x;
    gunichar haystackc = g_utf8_get_char(haystack);
    if (!config.case_sensitive) {
      haystackc = g_unichar_tolower(haystackc);
    }
    for (glong y = 1, lastdiag = x - 1; y <= needlelen; y++) {
      gunichar needlec = g_utf8_get_char(needles);
      if (!config.case_sensitive) {
        needlec = g_unichar_tolower(needlec);
      }
      unsigned int olddiag = column[y];
      column[y] = MIN3(column[y] + 1, column[y - 1] + 1,
                       lastdiag + (needlec == haystackc ? 0 : 1));
      lastdiag = olddiag;
      needles = g_utf8_next_char(needles);
    }
    haystack = g_utf8_next_char(haystack);
  }
  return column[needlelen];
}

char *rofi_latin_to_utf8_strdup(const char *input, gssize length) {
  gsize slength = 0;
  return g_convert_with_fallback(input, length, "UTF-8", "latin1", "\uFFFD",
                                 NULL, &slength, NULL);
}

char *rofi_force_utf8(const gchar *data, ssize_t length) {
  if (data == NULL) {
    return NULL;
  }
  const char *end;
  GString *string;

  if (g_utf8_validate(data, length, &end)) {
    return g_memdup(data, length + 1);
  }
  string = g_string_sized_new(length + 16);

  do {
    /* Valid part of the string */
    g_string_append_len(string, data, end - data);
    /* Replacement character */
    g_string_append(string, "\uFFFD");
    length -= (end - data) + 1;
    data = end + 1;
  } while (!g_utf8_validate(data, length, &end));

  if (length) {
    g_string_append_len(string, data, length);
  }

  return g_string_free(string, FALSE);
}

/****
 * FZF like scorer
 */

/** Max length of input to score. */
#define FUZZY_SCORER_MAX_LENGTH 256
/** minimum score */
#define MIN_SCORE (INT_MIN / 2)
/** Leading gap score */
#define LEADING_GAP_SCORE -4
/** gap score */
#define GAP_SCORE -5
/** start of word score */
#define WORD_START_SCORE 50
/** non-word score */
#define NON_WORD_SCORE 40
/** CamelCase score */
#define CAMEL_SCORE (WORD_START_SCORE + GAP_SCORE - 1)
/** Consecutive score */
#define CONSECUTIVE_SCORE (WORD_START_SCORE + GAP_SCORE)
/** non-start multiplier */
#define PATTERN_NON_START_MULTIPLIER 1
/** start multiplier */
#define PATTERN_START_MULTIPLIER 2

/**
 * Character classification.
 */
enum CharClass {
  /* Lower case */
  LOWER,
  /* Upper case */
  UPPER,
  /* Number */
  DIGIT,
  /* non word character */
  NON_WORD
};

/**
 * @param c The character to determine class of
 *
 * @returns the class of the character c.
 */
static enum CharClass rofi_scorer_get_character_class(gunichar c) {
  if (g_unichar_islower(c)) {
    return LOWER;
  }
  if (g_unichar_isupper(c)) {
    return UPPER;
  }
  if (g_unichar_isdigit(c)) {
    return DIGIT;
  }
  return NON_WORD;
}

/**
 * @param prev The previous character.
 * @param curr The current character
 *
 * Scrore the transition.
 *
 * @returns score of the transition.
 */
static int rofi_scorer_get_score_for(enum CharClass prev, enum CharClass curr) {
  if (prev == NON_WORD && curr != NON_WORD) {
    return WORD_START_SCORE;
  }
  if ((prev == LOWER && curr == UPPER) || (prev != DIGIT && curr == DIGIT)) {
    return CAMEL_SCORE;
  }
  if (curr == NON_WORD) {
    return NON_WORD_SCORE;
  }
  return 0;
}

int rofi_scorer_fuzzy_evaluate(const char *pattern, glong plen, const char *str,
                               glong slen) {
  if (slen > FUZZY_SCORER_MAX_LENGTH) {
    return -MIN_SCORE;
  }
  glong pi, si;
  // whether we are aligning the first character of pattern
  gboolean pfirst = TRUE;
  // whether the start of a word in pattern
  gboolean pstart = TRUE;
  // score for each position
  int *score = g_malloc_n(slen, sizeof(int));
  // dp[i]: maximum value by aligning pattern[0..pi] to str[0..si]
  int *dp = g_malloc_n(slen, sizeof(int));
  // uleft: value of the upper left cell; ulefts: maximum value of uleft and
  // cells on the left. The arbitrary initial values suppress warnings.
  int uleft = 0, ulefts = 0, left, lefts;
  const gchar *pit = pattern, *sit;
  enum CharClass prev = NON_WORD;
  for (si = 0, sit = str; si < slen; si++, sit = g_utf8_next_char(sit)) {
    enum CharClass cur = rofi_scorer_get_character_class(g_utf8_get_char(sit));
    score[si] = rofi_scorer_get_score_for(prev, cur);
    prev = cur;
    dp[si] = MIN_SCORE;
  }
  for (pi = 0; pi < plen; pi++, pit = g_utf8_next_char(pit)) {
    gunichar pc = g_utf8_get_char(pit), sc;
    if (g_unichar_isspace(pc)) {
      pstart = TRUE;
      continue;
    }
    lefts = MIN_SCORE;
    for (si = 0, sit = str; si < slen; si++, sit = g_utf8_next_char(sit)) {
      left = dp[si];
      lefts = MAX(lefts + GAP_SCORE, left);
      sc = g_utf8_get_char(sit);
      if (config.case_sensitive
              ? pc == sc
              : g_unichar_tolower(pc) == g_unichar_tolower(sc)) {
        int t = score[si] * (pstart ? PATTERN_START_MULTIPLIER
                                    : PATTERN_NON_START_MULTIPLIER);
        dp[si] = pfirst ? LEADING_GAP_SCORE * si + t
                        : MAX(uleft + CONSECUTIVE_SCORE, ulefts + t);
      } else {
        dp[si] = MIN_SCORE;
      }
      uleft = left;
      ulefts = lefts;
    }
    pfirst = pstart = FALSE;
  }
  lefts = MIN_SCORE;
  for (si = 0; si < slen; si++) {
    lefts = MAX(lefts + GAP_SCORE, dp[si]);
  }
  g_free(score);
  g_free(dp);
  return -lefts;
}

/**
 * @param a    UTF-8 string to compare
 * @param b    UTF-8 string to compare
 * @param n    Maximum number of characters to compare
 *
 * Compares the `G_NORMALIZE_ALL_COMPOSE` forms of the two strings.
 *
 * @returns less than, equal to, or greater than zero if the first `n`
 * characters (not bytes) of `a` are found, respectively, to be less than, to
 * match, or be greater than the first `n` characters (not bytes) of `b`.
 */
int utf8_strncmp(const char *a, const char *b, size_t n) {
  char *na = g_utf8_normalize(a, -1, G_NORMALIZE_ALL_COMPOSE);
  char *nb = g_utf8_normalize(b, -1, G_NORMALIZE_ALL_COMPOSE);
  *g_utf8_offset_to_pointer(na, n) = '\0';
  *g_utf8_offset_to_pointer(nb, n) = '\0';
  int r = g_utf8_collate(na, nb);
  g_free(na);
  g_free(nb);
  return r;
}

gboolean helper_execute(const char *wd, char **args, const char *error_precmd,
                        const char *error_cmd,
                        RofiHelperExecuteContext *context) {
  gboolean retv = TRUE;
  GError *error = NULL;

  GSpawnChildSetupFunc child_setup = NULL;
  gpointer user_data = NULL;

  display_startup_notification(context, &child_setup, &user_data);

  g_spawn_async(wd, args, NULL, G_SPAWN_SEARCH_PATH, child_setup, user_data,
                NULL, &error);
  if (error != NULL) {
    char *msg = g_strdup_printf("Failed to execute: '%s%s'\nError: '%s'",
                                error_precmd, error_cmd, error->message);
    rofi_view_error_dialog(msg, FALSE);
    g_free(msg);
    // print error.
    g_error_free(error);
    retv = FALSE;
  }

  // Free the args list.
  g_strfreev(args);
  return retv;
}

gboolean helper_execute_command(const char *wd, const char *cmd,
                                gboolean run_in_term,
                                RofiHelperExecuteContext *context) {
  char **args = NULL;
  int argc = 0;

  if (run_in_term) {
    helper_parse_setup(config.run_shell_command, &args, &argc, "{cmd}", cmd,
                       (char *)0);
  } else {
    helper_parse_setup(config.run_command, &args, &argc, "{cmd}", cmd,
                       (char *)0);
  }

  if (args == NULL) {
    return FALSE;
  }

  if (context != NULL) {
    if (context->name == NULL) {
      context->name = args[0];
    }
    if (context->binary == NULL) {
      context->binary = args[0];
    }
    if (context->description == NULL) {
      gsize l = strlen("Launching '' via rofi") + strlen(cmd) + 1;
      gchar *description = g_newa(gchar, l);

      g_snprintf(description, l, "Launching '%s' via rofi", cmd);
      context->description = description;
    }
    if (context->command == NULL) {
      context->command = cmd;
    }
  }

  return helper_execute(wd, args, "", cmd, context);
}

char *helper_get_theme_path(const char *file, const char *ext) {
  char *filename = rofi_expand_path(file);
  g_debug("Opening theme, testing: %s\n", filename);
  if (g_file_test(filename, G_FILE_TEST_EXISTS)) {
    return filename;
  }
  g_free(filename);

  if (g_str_has_suffix(file, ext)) {
    filename = g_strdup(file);
  } else {
    filename = g_strconcat(file, ext, NULL);
  }
  // Check config's themes directory.
  const char *cpath = g_get_user_config_dir();
  if (cpath) {
    char *themep = g_build_filename(cpath, "rofi", "themes", filename, NULL);
    g_debug("Opening theme, testing: %s", themep);
    if (themep && g_file_test(themep, G_FILE_TEST_EXISTS)) {
      g_free(filename);
      return themep;
    }
    g_free(themep);
  }
  // Check config directory.
  if (cpath) {
    char *themep = g_build_filename(cpath, "rofi", filename, NULL);
    g_debug("Opening theme, testing: %s", themep);
    if (g_file_test(themep, G_FILE_TEST_EXISTS)) {
      g_free(filename);
      return themep;
    }
    g_free(themep);
  }
  const char *datadir = g_get_user_data_dir();
  if (datadir) {
    char *theme_path =
        g_build_filename(datadir, "rofi", "themes", filename, NULL);
    if (theme_path) {
      g_debug("Opening theme, testing: %s", theme_path);
      if (g_file_test(theme_path, G_FILE_TEST_EXISTS)) {
        g_free(filename);
        return theme_path;
      }
      g_free(theme_path);
    }
  }

  const gchar *const *system_data_dirs = g_get_system_data_dirs();
  if (system_data_dirs) {
    for (uint_fast32_t i = 0; system_data_dirs[i] != NULL; i++) {
      const char *const sdatadir = system_data_dirs[i];
      g_debug("Opening theme directory: %s", sdatadir);
      char *theme_path =
          g_build_filename(sdatadir, "rofi", "themes", filename, NULL);
      if (theme_path) {
        g_debug("Opening theme, testing: %s", theme_path);
        if (g_file_test(theme_path, G_FILE_TEST_EXISTS)) {
          g_free(filename);
          return theme_path;
        }
        g_free(theme_path);
      }
    }
  }

  char *theme_path = g_build_filename(THEME_DIR, filename, NULL);
  if (theme_path) {
    g_debug("Opening theme, testing: %s", theme_path);
    if (g_file_test(theme_path, G_FILE_TEST_EXISTS)) {
      g_free(filename);
      return theme_path;
    }
    g_free(theme_path);
  }
  return filename;
}

static gboolean parse_pair(char *input, rofi_range_pair *item) {
  // Skip leading blanks.
  while (input != NULL && isblank(*input)) {
    ++input;
  }

  if (input == NULL) {
    return FALSE;
  }

  const char *sep[] = {"-", ":"};
  int pythonic = (strchr(input, ':') || input[0] == '-') ? 1 : 0;
  int index = 0;

  for (char *token = strsep(&input, sep[pythonic]); token != NULL;
       token = strsep(&input, sep[pythonic])) {
    if (index == 0) {
      item->start = item->stop = (int)strtol(token, NULL, 10);
      index++;
      continue;
    }

    if (token[0] == '\0') {
      item->stop = -1;
      continue;
    }

    item->stop = (int)strtol(token, NULL, 10);
    if (pythonic) {
      --item->stop;
    }
  }
  return TRUE;
}
void parse_ranges(char *input, rofi_range_pair **list, unsigned int *length) {
  char *endp;
  if (input == NULL) {
    return;
  }
  const char *const sep = ",";
  for (char *token = strtok_r(input, sep, &endp); token != NULL;
       token = strtok_r(NULL, sep, &endp)) {
    // Make space.
    *list =
        g_realloc((*list), ((*length) + 1) * sizeof(struct rofi_range_pair));
    // Parse a single pair.
    if (parse_pair(token, &((*list)[*length]))) {
      (*length)++;
    }
  }
}
void rofi_output_formatted_line(const char *format, const char *string,
                                int selected_line, const char *filter) {
  for (int i = 0; format && format[i]; i++) {
    if (format[i] == 'i') {
      fprintf(stdout, "%d", selected_line);
    } else if (format[i] == 'd') {
      fprintf(stdout, "%d", (selected_line + 1));
    } else if (format[i] == 's') {
      fputs(string, stdout);
    } else if (format[i] == 'p') {
      char *esc = NULL;
      pango_parse_markup(string, -1, 0, NULL, &esc, NULL, NULL);
      if (esc) {
        fputs(esc, stdout);
        g_free(esc);
      } else {
        fputs("invalid string", stdout);
      }
    } else if (format[i] == 'q') {
      char *quote = g_shell_quote(string);
      fputs(quote, stdout);
      g_free(quote);
    } else if (format[i] == 'f') {
      if (filter) {
        fputs(filter, stdout);
      }
    } else if (format[i] == 'F') {
      if (filter) {
        char *quote = g_shell_quote(filter);
        fputs(quote, stdout);
        g_free(quote);
      }
    } else {
      fputc(format[i], stdout);
    }
  }
  fputc('\n', stdout);
  fflush(stdout);
}

static gboolean helper_eval_cb2(const GMatchInfo *info, GString *res,
                                gpointer data) {
  gchar *match;
  // Get the match
  int num_match = g_match_info_get_match_count(info);
  // Just {text} This is inside () 5.
  if (num_match == 5) {
    match = g_match_info_fetch(info, 4);
    if (match != NULL) {
      // Lookup the match, so we can replace it.
      gchar *r = g_hash_table_lookup((GHashTable *)data, match);
      if (r != NULL) {
        // Append the replacement to the string.
        g_string_append(res, r);
      }
      // Free match.
      g_free(match);
    }
  }
  // {} with [] guard around it.
  else if (num_match == 4) {
    match = g_match_info_fetch(info, 2);
    if (match != NULL) {
      // Lookup the match, so we can replace it.
      gchar *r = g_hash_table_lookup((GHashTable *)data, match);
      if (r != NULL) {
        // Add (optional) prefix
        gchar *prefix = g_match_info_fetch(info, 1);
        g_string_append(res, prefix);
        g_free(prefix);
        // Append the replacement to the string.
        g_string_append(res, r);
        // Add (optional) postfix
        gchar *post = g_match_info_fetch(info, 3);
        g_string_append(res, post);
        g_free(post);
      }
      // Free match.
      g_free(match);
    }
  }
  // Else we have an invalid match.
  // Continue replacement.
  return FALSE;
}

char *helper_string_replace_if_exists(char *string, ...) {
  GHashTable *h;
  h = g_hash_table_new(g_str_hash, g_str_equal);
  va_list ap;
  va_start(ap, string);
  // Add list from variable arguments.
  while (1) {
    char *key = va_arg(ap, char *);
    if (key == (char *)0) {
      break;
    }
    char *value = va_arg(ap, char *);
    g_hash_table_insert(h, key, value);
  }
  char *retv = helper_string_replace_if_exists_v(string, h);
  va_end(ap);
  // Destroy key-value storage.
  g_hash_table_destroy(h);
  return retv;
}
/**
 * @param string The string with elements to be replaced
 * @param h      Hash table with set of {key}, value that will be replaced,
 * terminated by  a NULL
 *
 * Items {key} are replaced by the value if '{key}' is passed as key/value
 * pair, otherwise removed from string. If the {key} is in between []  all the
 * text between [] are removed if {key} is not found. Otherwise key is
 * replaced and [ & ] removed.
 *
 * This allows for optional replacement, f.e.   '{ssh-client} [-t  {title}] -e
 * "{cmd}"' the '-t {title}' is only there if {title} is set.
 *
 * @returns a new string with the keys replaced.
 */
char *helper_string_replace_if_exists_v(char *string, GHashTable *h) {
  GError *error = NULL;
  char *res = NULL;

  // Replace hits within {-\w+}.
  GRegex *reg = g_regex_new("\\[(.*)({[-\\w]+})(.*)\\]|({[\\w-]+})",
                            G_REGEX_UNGREEDY, 0, &error);
  if (error == NULL) {
    res =
        g_regex_replace_eval(reg, string, -1, 0, 0, helper_eval_cb2, h, &error);
  }
  // Free regex.
  g_regex_unref(reg);
  // Throw error if shell parsing fails.
  if (error != NULL) {
    char *msg = g_strdup_printf("Failed to parse: '%s'\nError: '%s'", string,
                                error->message);
    rofi_view_error_dialog(msg, FALSE);
    g_free(msg);
    // print error.
    g_error_free(error);
    g_free(res);
    return NULL;
  }
  return res;
}