Changed indentation to avoid a gcc warning.
[mymail.git] / mymail.c
index cc55261..a04fde8 100644 (file)
--- a/mymail.c
+++ b/mymail.c
 
 /*
 
-  This command is a dumb mail indexer. It can either (1) scan
-  directories containing mbox files, and create a db file containing
-  for each mail a list of fields computed from the header, or (2)
-  read such a db file and get all the mails matching regexp-defined
-  conditions on the fields.
+  mymail is a simple mail indexer. It can:
+
+  (1) scan mbox files, and create a db file containing for each mail a
+      list of fields computed from its header.
+
+  (2) read such a db file, gets all the mails matching regexp-defined
+      conditions on the fields, and generates a resulting mbox file.
 
   It is low-tech, simple, light and fast.
 
@@ -35,6 +37,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <sys/stat.h>
 #include <string.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <time.h>
 
 #define MYMAIL_DB_MAGIC_TOKEN "mymail_index_file"
-#define VERSION "0.9.2"
+#define MYMAIL_VERSION "0.9.10"
+
+#define MYMAIL_DB_FORMAT_VERSION 1
 
-#define MAX_NB_SEARCH_CONDITIONS 10
+#define MAX_NB_SEARCH_CONDITIONS 32
 
 #define BUFFER_SIZE 65536
 #define TOKEN_BUFFER_SIZE 1024
 
-#define LEADING_FROM_LINE_REGEXP "^From [^ ]*  \\(Mon\\|Tue\\|Wed\\|Thu\\|Fri\\|Sat\\|Sun\\) \\(Jan\\|Feb\\|Mar\\|Apr\\|May\\|Jun\\|Jul\\|Aug\\|Sep\\|Oct\\|Nov\\|Dec\\) [ 123][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9] [0-9][0-9][0-9][0-9]\n$"
+#define LEADING_FROM_LINE_REGEXP_STRING "^From .*\\(Mon\\|Tue\\|Wed\\|Thu\\|Fri\\|Sat\\|Sun\\) \\(Jan\\|Feb\\|Mar\\|Apr\\|May\\|Jun\\|Jul\\|Aug\\|Sep\\|Oct\\|Nov\\|Dec\\) [ 0123][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9] [0-9][0-9][0-9][0-9]\n$"
+
+/********************************************************************/
 
-regex_t leading_from_line_regexp;
+struct alias_node {
+  char *alias, *value;
+  struct alias_node *next;
+};
 
 /* Global variables! */
 
-int paranoid;
-int quiet;
-char *default_search_field;
-int ignore_dot_files;
+int global_quiet;
+int global_use_leading_time;
+int global_nb_mails_max;
+int global_discard_mail_from_the_future;
+regex_t global_leading_from_line_regexp;
+struct alias_node *global_alias_list;
+time_t global_current_time;
 
 /********************************************************************/
 
@@ -75,11 +88,14 @@ enum {
   ID_DATE,
   ID_PARTICIPANT,
   ID_BODY,
-  ID_INTERVAL,
+  ID_TIME_INTERVAL,
+  ID_MAIL_ID,
+  ID_REFERENCE_ID,
+  ID_THREAD_ID,
   MAX_ID
 };
 
-static char *field_names[] = {
+static char *field_keys[] = {
   "mail",
   "lead",
   "from",
@@ -88,16 +104,19 @@ static char *field_names[] = {
   "date",
   "part",
   "body",
-  "interval"
+  "interval",
+  "mailid",
+  "reference",
+  "thread"
 };
 
 /********************************************************************/
 
 struct search_condition {
-  int field_id;
+  int db_key;
+  regex_t db_value_regexp;
   int negation;
-  regex_t regexp;
-  time_t interval_start, interval_stop;
+  time_t time_start, time_stop;
 };
 
 /********************************************************************/
@@ -145,6 +164,20 @@ static struct parsable_field fields_to_parse[] = {
     { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
   },
 
+  {
+    ID_MAIL_ID,
+    REG_ICASE,
+    "^message-id: ",
+    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
+  },
+
+  {
+    ID_REFERENCE_ID,
+    REG_ICASE,
+    "^\\(in-reply-to\\|references\\): ",
+    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
+  },
+
 };
 
 /********************************************************************/
@@ -153,21 +186,40 @@ int xor(int a, int b) {
   return (a && !b) || (!a && b);
 }
 
-char *parse_token(char *token_buffer, size_t token_buffer_size,
-                  char separator, char *string) {
+const char *parse_token(char *token_buffer, size_t token_buffer_size,
+                        char separator, const char *string) {
   char *u = token_buffer;
-  while(u < token_buffer + token_buffer_size - 1 && *string &&
-        *string != separator) {
+
+  while(*string == separator) { string++; }
+
+  while(u < token_buffer + token_buffer_size - 1 && *string && *string != separator) {
     *(u++) = *(string++);
   }
-  while(*string == separator) string++;
+
+  while(*string == separator) { string++; }
+
   *u = '\0';
   return string;
 }
 
-/********************************************************************/
+char *default_value(char *current_value,
+                    const char *env_variable,
+                    const char *hard_default_value) {
+  if(current_value) {
+    return current_value;
+  } else {
+    char *env_value = getenv(env_variable);
+    if(env_value) {
+      return strdup(env_value);
+    } else if(hard_default_value) {
+      return strdup(hard_default_value);
+    } else {
+      return 0;
+    }
+  }
+}
 
-/* malloc with error checking.  */
+/********************************************************************/
 
 void *safe_malloc(size_t n) {
   void *p = malloc(n);
@@ -179,10 +231,23 @@ void *safe_malloc(size_t n) {
   return p;
 }
 
+FILE *safe_fopen(const char *path, const char *mode, const char *comment) {
+  FILE *result = fopen(path, mode);
+  if(result) {
+    return result;
+  } else {
+    fprintf(stderr,
+            "mymail: Cannot open file '%s' (%s) with mode \"%s\": %s\n",
+            path, comment, mode,
+            strerror(errno));
+    exit(EXIT_FAILURE);
+  }
+}
+
 /*********************************************************************/
 
 void print_version(FILE *out) {
-  fprintf(out, "mymail version %s (%s)\n", VERSION, UNAME);
+  fprintf(out, "mymail version %s (%s)\n", MYMAIL_VERSION, UNAME);
 }
 
 void print_usage(FILE *out) {
@@ -197,34 +262,32 @@ void print_usage(FILE *out) {
   fprintf(out, "         print the version number\n");
   fprintf(out, " -q, --quiet\n");
   fprintf(out, "         do not print information during search\n");
+  fprintf(out, " -t, --use-leading-time\n");
+  fprintf(out, "         use the time stamp from the leading line of each mail and not the Date:\n");
+  fprintf(out, "         field\n");
+  fprintf(out, " -f, --do-not-discard-mails-from-the-future\n");
+  fprintf(out, "         do not ignore mails with a date more than 24h in the future\n");
   fprintf(out, " -p <db filename pattern>, --db-pattern <db filename pattern>\n");
   fprintf(out, "         set the db filename pattern for recursive search\n");
   fprintf(out, " -r <db root path>, --db-root <db root path>\n");
   fprintf(out, "         set the db root path for recursive search\n");
   fprintf(out, " -l <db filename list>, --db-list <db filename list>\n");
   fprintf(out, "         set the semicolon-separated list of db files for search\n");
+  fprintf(out, " -m <mbox filename pattern>, --mbox-pattern <mbox filename pattern>\n");
+  fprintf(out, "         set the mbox filename pattern for recursive search\n");
   fprintf(out, " -s <search pattern>, --search <search pattern>\n");
   fprintf(out, "         search for matching mails in the db file\n");
-  fprintf(out, " -d <db filename>, --db-file <db filename>\n");
+  fprintf(out, " -d <db filename>, --db-file-output <db filename>\n");
   fprintf(out, "         set the db filename for indexing\n");
   fprintf(out, " -i, --index\n");
   fprintf(out, "         index mails\n");
   fprintf(out, " -o <output filename>, --output <output filename>\n");
   fprintf(out, "         set the result file, use stdout if unset\n");
+  fprintf(out, " -n <max number of mails>, --nb-mails-max <max number of mails>\n");
+  fprintf(out, "         set the maximum number of mails to extract\n");
   fprintf(out, " -a <search field>, --default-search <search field>\n");
   fprintf(out, "         set the default search field\n");
-}
 
-/*********************************************************************/
-
-time_t time_for_past_day(int day) {
-  time_t t;
-  struct tm *tm;
-  int delta_day;
-  t = time(0);
-  tm = localtime(&t);
-  delta_day = (7 + tm->tm_wday - day) % 7 + 1;
-  return t - delta_day * 3600 * 24 + tm->tm_sec + 60 * tm->tm_min + 3600 * tm->tm_hour;
 }
 
 /*********************************************************************/
@@ -233,67 +296,40 @@ int ignore_entry(const char *name) {
   return
     strcmp(name, ".") == 0 ||
     strcmp(name, "..") == 0 ||
-    (ignore_dot_files && name[0] == '.' && name[1] != '/');
+    (name[0] == '.' && name[1] != '/');
 }
 
 int is_a_leading_from_line(char *mbox_line) {
   return
-
-    /*
-
-      The mbox man page in qmail documentation states:
-
-       > The reader should not attempt to take advantage of the fact
-       > that every From_ line (past the beginning of the file) is
-       > preceded by a blank line.
-
-    */
-
     strncmp(mbox_line, "From ", 5) == 0 &&
-    regexec(&leading_from_line_regexp, mbox_line, 0, 0, 0) == 0;
+    regexec(&global_leading_from_line_regexp, mbox_line, 0, 0, 0) == 0;
 }
 
-int mbox_line_match_search(struct search_condition *condition,
-                           int mbox_id, char *mbox_value) {
-
-  if(condition->field_id == ID_INTERVAL) {
-    if(mbox_id == ID_LEADING_LINE) {
-      char *c;
-      time_t t;
-      struct tm tm;
-
-      c = mbox_value;
-      while(*c && *c != ' ') c++; while(*c && *c == ' ') c++;
-      strptime(c, "%a %b %e %k:%M:%S %Y", &tm);
-      t = mktime(&tm);
+int db_line_match_search(struct search_condition *condition,
+                         int db_key, const char *db_value) {
 
-      return (t >= condition->interval_start &&
-              (condition->interval_stop == 0 ||
-               t <= condition->interval_stop));
-    } else {
-      return 0;
-    }
-  } else {
-    return
-      (
+  return
+    (
+     (condition->db_key == db_key)
 
-       (condition->field_id == mbox_id)
+     ||
 
-       ||
+     (condition->db_key == ID_PARTICIPANT && (db_key == ID_LEADING_LINE ||
+                                              db_key == ID_FROM ||
+                                              db_key == ID_TO))
+     ||
 
-       (condition->field_id == ID_PARTICIPANT && (mbox_id == ID_LEADING_LINE ||
-                                                  mbox_id == ID_FROM ||
-                                                  mbox_id == ID_TO))
-       ||
+     (condition->db_key == ID_FROM && db_key == ID_LEADING_LINE)
 
-       (condition->field_id == ID_FROM && mbox_id == ID_LEADING_LINE)
+     ||
 
-       )
+     (condition->db_key == ID_THREAD_ID && (db_key == ID_MAIL_ID ||
+                                            db_key == ID_REFERENCE_ID))
+     )
 
-      &&
+    &&
 
-      regexec(&condition->regexp, mbox_value, 0, 0, 0) == 0;
-  }
+    regexec(&condition->db_value_regexp, db_value, 0, 0, 0) == 0;
 }
 
 void update_body_hits(char *mail_filename, int position_in_mail,
@@ -308,29 +344,19 @@ void update_body_hits(char *mail_filename, int position_in_mail,
   nb_body_hits = 0;
 
   header = 1;
-  mail_file = fopen(mail_filename, "r");
-
-  if(!mail_file) {
-    fprintf(stderr,
-            "mymail: Cannot open mbox '%s' for body scan.\n",
-            mail_filename);
-    exit(EXIT_FAILURE);
-  }
+  mail_file = safe_fopen(mail_filename, "r", "mbox for body scan");
 
   fseek(mail_file, position_in_mail, SEEK_SET);
 
   if(fgets(raw_mbox_line, BUFFER_SIZE, mail_file)) {
     while(nb_body_hits < nb_body_conditions) {
-      /* last_mbox_line_was_empty = (raw_mbox_line[0] == '\n'); */
-      /* if(last_mbox_line_was_empty) { header = 0; } */
-
       if(raw_mbox_line[0] == '\n') { header = 0; }
 
       if(!header) {
         for(n = 0; n < nb_search_conditions; n++) {
-          if(search_conditions[n].field_id == ID_BODY && !hits[n]) {
+          if(search_conditions[n].db_key == ID_BODY && !hits[n]) {
             hits[n] =
-              (regexec(&search_conditions[n].regexp, raw_mbox_line, 0, 0, 0) == 0);
+              (regexec(&search_conditions[n].db_value_regexp, raw_mbox_line, 0, 0, 0) == 0);
             if(hits[n]) {
               nb_body_hits++;
             }
@@ -347,28 +373,22 @@ void update_body_hits(char *mail_filename, int position_in_mail,
   fclose(mail_file);
 }
 
-void write_mail(const char *mail_filename, unsigned long int position_in_mail,
-                FILE *output_file) {
+void extract_mail(const char *mail_filename, unsigned long int position_in_mail,
+                  FILE *output_file) {
   char raw_mbox_line[BUFFER_SIZE];
   FILE *mail_file;
 
-  mail_file = fopen(mail_filename, "r");
-
-  if(!mail_file) {
-    fprintf(stderr,
-            "mymail: Cannot open mbox '%s' for mail extraction.\n",
-            mail_filename);
-    exit(EXIT_FAILURE);
-  }
+  /* printf("Extract\n"); */
 
+  mail_file = safe_fopen(mail_filename, "r", "mbox for mail extraction");
+  /* fchmod(fileno(mail_file), 0x660); */
   fseek(mail_file, position_in_mail, SEEK_SET);
 
   if(fgets(raw_mbox_line, BUFFER_SIZE, mail_file)) {
     fprintf(output_file, "%s", raw_mbox_line);
     while(1) {
       if(!fgets(raw_mbox_line, BUFFER_SIZE, mail_file) ||
-         (is_a_leading_from_line(raw_mbox_line))
-         )
+         is_a_leading_from_line(raw_mbox_line))
         break;
       fprintf(output_file, "%s", raw_mbox_line);
     }
@@ -377,35 +397,109 @@ void write_mail(const char *mail_filename, unsigned long int position_in_mail,
   fclose(mail_file);
 }
 
-void search_in_db(const char *db_filename,
-                  int nb_search_conditions,
-                  struct search_condition *search_conditions,
-                  FILE *output_file) {
+int check_full_mail_match(char *current_mail_filename,
+                          time_t mail_time,
+                          int nb_search_conditions,
+                          struct search_condition *search_conditions,
+                          int nb_body_conditions,
+                          int *hits,
+                          int current_position_in_mail) {
+  int n, nb_fulfilled_body_conditions;
 
-  int hits[MAX_NB_SEARCH_CONDITIONS];
+  for(n = 0; n < nb_search_conditions; n++) {
+    if(search_conditions[n].db_key == ID_TIME_INTERVAL) {
+      hits[n] = (mail_time >= search_conditions[n].time_start &&
+                 (search_conditions[n].time_stop == 0 ||
+                  mail_time <= search_conditions[n].time_stop));
+    }
+  }
+
+  /* We first check all conditions but the body ones */
+
+  for(n = 0; n < nb_search_conditions &&
+        ((search_conditions[n].db_key == ID_BODY) ||
+         xor(hits[n], search_conditions[n].negation)); n++);
+
+  if(n == nb_search_conditions) {
+
+    /* Now check the body ones */
+
+    nb_fulfilled_body_conditions = 0;
+
+    if(nb_body_conditions > 0) {
+      update_body_hits(current_mail_filename, current_position_in_mail,
+                       nb_search_conditions, search_conditions,
+                       nb_body_conditions,
+                       hits);
+
+      for(n = 0; n < nb_search_conditions; n++) {
+        if(search_conditions[n].db_key == ID_BODY &&
+           xor(hits[n], search_conditions[n].negation)) {
+          nb_fulfilled_body_conditions++;
+        }
+      }
+    }
+    return nb_body_conditions == nb_fulfilled_body_conditions;
+  } else {
+    return 0;
+  }
+}
+
+/* We use the mail leading line time by default, and if we should and
+   can, we update with the Date: field */
+
+void update_time(int db_key, const char *db_value, time_t *t) {
+  const char *c;
+  struct tm tm;
+
+  memset(&tm, 0, sizeof(struct tm));
+
+  if(db_key == ID_LEADING_LINE) {
+    c = db_value;
+    while(*c && *c != ' ') c++;
+    while(*c && *c == ' ') c++;
+    /* printf("From %s", db_value); */
+    strptime(c, "%a %b %e %k:%M:%S %Y", &tm);
+    *t = mktime(&tm);
+  } else {
+    if(!global_use_leading_time) {
+      if(db_key == ID_DATE) {
+        if(strptime(db_value, "%a, %d %b %Y %k:%M:%S", &tm) ||
+           strptime(db_value, "%d %b %Y %k:%M:%S", &tm)) {
+          /* printf("Date: %s", db_value); */
+          *t = mktime(&tm);
+        }
+      }
+    }
+  }
+}
+
+int search_in_db(const char *db_filename,
+                 int nb_extracted_mails,
+                 int nb_search_conditions,
+                 struct search_condition *search_conditions,
+                 FILE *output_file) {
+
+  FILE *db_file;
   char raw_db_line[BUFFER_SIZE];
   char current_mail_filename[PATH_MAX + 1];
+  char db_key_string[TOKEN_BUFFER_SIZE];
+  char position_in_file_string[TOKEN_BUFFER_SIZE];
   unsigned long int current_position_in_mail;
-  char mbox_name[TOKEN_BUFFER_SIZE], *mbox_value;
-  int mbox_id;
-  int already_written, m, n;
-  int nb_body_conditions, nb_fulfilled_body_conditions;
-  FILE *db_file;
+  const char *db_value;
+  int db_key;
+  int hits[MAX_NB_SEARCH_CONDITIONS];
+  int nb_body_conditions, need_time;
+  time_t mail_time;
 
-  if(!quiet) {
+  int m, n;
+
+  if(!global_quiet) {
     printf("Searching in '%s' ... ", db_filename);
     fflush(stdout);
   }
 
-  db_file = fopen(db_filename, "r");
-
-  if(!db_file) {
-    fprintf(stderr,
-            "mymail: Cannot open \"%s\" for reading: %s\n",
-            db_filename,
-            strerror(errno));
-    exit(EXIT_FAILURE);
-  }
+  db_file = safe_fopen(db_filename, "r", "index file for search");
 
   /* First, check the db file leading line integrity */
 
@@ -426,93 +520,99 @@ void search_in_db(const char *db_filename,
   /* Then parse the said db file */
 
   current_position_in_mail = 0;
-  already_written = 0;
 
   for(n = 0; n < nb_search_conditions; n++) { hits[n] = 0; }
 
   nb_body_conditions = 0;
+  need_time = global_discard_mail_from_the_future;
+  mail_time = 0;
+
   for(n = 0; n < nb_search_conditions; n++) {
-    if(search_conditions[n].field_id == ID_BODY) {
+    if(search_conditions[n].db_key == ID_BODY) {
       nb_body_conditions++;
     }
+    else if(search_conditions[n].db_key == ID_TIME_INTERVAL) {
+      need_time = 1;
+    }
   }
 
   strcpy(current_mail_filename, "");
 
-  while(fgets(raw_db_line, BUFFER_SIZE, db_file)) {
-    mbox_value = parse_token(mbox_name, TOKEN_BUFFER_SIZE, ' ', raw_db_line);
-
-    if(strcmp("mail", mbox_name) == 0) {
-      char position_in_file_string[TOKEN_BUFFER_SIZE];
-
-      if(current_mail_filename[0]) {
-
-        /* We first check all conditions but the body ones */
+  while(nb_extracted_mails < global_nb_mails_max &&
+        fgets(raw_db_line, BUFFER_SIZE, db_file)) {
 
-        for(n = 0; n < nb_search_conditions &&
-              ((search_conditions[n].field_id == ID_BODY) ||
-               xor(hits[n], search_conditions[n].negation)); n++);
+    /* Removes the CR */
+    char *s = raw_db_line;
+    while(*s && *s != '\n') { s++; }
+    *s = '\0';
 
-        if(n == nb_search_conditions) {
+    db_value = parse_token(db_key_string, TOKEN_BUFFER_SIZE, ' ', raw_db_line);
 
-          /* Now check the body ones */
-
-          if(nb_body_conditions > 0) {
-            update_body_hits(current_mail_filename, current_position_in_mail,
-                             nb_search_conditions, search_conditions,
-                             nb_body_conditions,
-                             hits);
-          }
-
-          nb_fulfilled_body_conditions = 0;
-
-          for(n = 0; n < nb_search_conditions; n++) {
-            if(search_conditions[n].field_id == ID_BODY &&
-               xor(hits[n], search_conditions[n].negation)) {
-              nb_fulfilled_body_conditions++;
-            }
-          }
-
-          if(nb_body_conditions == nb_fulfilled_body_conditions) {
-            write_mail(current_mail_filename, current_position_in_mail, output_file);
-          }
-        }
+    if(strcmp("mail", db_key_string) == 0) {
+      if(current_mail_filename[0] &&
+         (!global_discard_mail_from_the_future || mail_time < global_current_time + 3600 * 24) &&
+         check_full_mail_match(current_mail_filename,
+                               mail_time,
+                               nb_search_conditions, search_conditions,
+                               nb_body_conditions, hits, current_position_in_mail)) {
+        extract_mail(current_mail_filename, current_position_in_mail, output_file);
+        nb_extracted_mails++;
       }
 
       for(n = 0; n < nb_search_conditions; n++) { hits[n] = 0; }
-
-      mbox_value = parse_token(position_in_file_string, TOKEN_BUFFER_SIZE, ' ', mbox_value);
-      mbox_value = parse_token(current_mail_filename, TOKEN_BUFFER_SIZE, '\n', mbox_value);
+      db_value = parse_token(position_in_file_string, TOKEN_BUFFER_SIZE, ' ', db_value);
+      strncpy(current_mail_filename, db_value, PATH_MAX + 1);
       current_position_in_mail = atol(position_in_file_string);
-      already_written = 0;
     }
 
     else {
-      mbox_id = -1;
-      for(m = 0; (m < MAX_ID) && mbox_id == -1; m++) {
-        if(strncmp(field_names[m], mbox_name, strlen(mbox_name)) == 0) {
-          mbox_id = m;
+      db_key = -1;
+      for(m = 0; (m < MAX_ID) && db_key == -1; m++) {
+        if(strncmp(field_keys[m], db_key_string, strlen(db_key_string)) == 0) {
+          db_key = m;
         }
       }
+
       for(n = 0; n < nb_search_conditions; n++) {
-        hits[n] |= mbox_line_match_search(&search_conditions[n],
-                                          mbox_id, mbox_value);
+        hits[n] |= db_line_match_search(&search_conditions[n],
+                                        db_key, db_value);
+      }
+
+      if(need_time) {
+        update_time(db_key, db_value, &mail_time);
       }
     }
   }
 
+  /* printf("global_discard_mail_from_the_future = %d\n",
+     global_discard_mail_from_the_future); */
+
+  if(nb_extracted_mails < global_nb_mails_max &&
+     current_mail_filename[0] &&
+     (!global_discard_mail_from_the_future || mail_time < global_current_time + 3600 * 24) &&
+     check_full_mail_match(current_mail_filename,
+                           mail_time,
+                           nb_search_conditions, search_conditions,
+                           nb_body_conditions, hits, current_position_in_mail)) {
+    extract_mail(current_mail_filename, current_position_in_mail, output_file);
+    nb_extracted_mails++;
+  }
+
   fclose(db_file);
 
-  if(!quiet) {
+  if(!global_quiet) {
     printf("done.\n");
     fflush(stdout);
   }
+
+  return nb_extracted_mails;
 }
 
-void recursive_search_in_db(const char *entry_name, regex_t *db_filename_regexp,
-                            int nb_search_conditions,
-                            struct search_condition *search_conditions,
-                            FILE *output_file) {
+int recursive_search_in_db(const char *entry_name, regex_t *db_filename_regexp,
+                           int nb_extracted_mails,
+                           int nb_search_conditions,
+                           struct search_condition *search_conditions,
+                           FILE *output_file) {
   DIR *dir;
   struct dirent *dir_e;
   struct stat sb;
@@ -526,15 +626,19 @@ void recursive_search_in_db(const char *entry_name, regex_t *db_filename_regexp,
     exit(EXIT_FAILURE);
   }
 
+  /* printf("recursive_search_in_db %s\n", entry_name); */
+
   dir = opendir(entry_name);
 
   if(dir) {
-    while((dir_e = readdir(dir))) {
+    while((dir_e = readdir(dir)) &&
+          nb_extracted_mails < global_nb_mails_max) {
       if(!ignore_entry(dir_e->d_name)) {
         snprintf(subname, PATH_MAX, "%s/%s", entry_name, dir_e->d_name);
-        recursive_search_in_db(subname, db_filename_regexp,
-                               nb_search_conditions, search_conditions,
-                               output_file);
+        nb_extracted_mails = recursive_search_in_db(subname, db_filename_regexp,
+                                                    nb_extracted_mails,
+                                                    nb_search_conditions, search_conditions,
+                                                    output_file);
       }
     }
     closedir(dir);
@@ -545,21 +649,27 @@ void recursive_search_in_db(const char *entry_name, regex_t *db_filename_regexp,
     while(*s) { if(*s == '/') { filename = s+1; } s++; }
 
     if(regexec(db_filename_regexp, filename, 0, 0, 0) == 0) {
-      search_in_db(entry_name, nb_search_conditions, search_conditions, output_file);
+      nb_extracted_mails =
+        search_in_db(entry_name,
+                     nb_extracted_mails,
+                     nb_search_conditions, search_conditions, output_file);
     }
   }
+
+  return nb_extracted_mails;
 }
 
 /*********************************************************************/
 
-void index_one_mbox_line(int nb_fields_to_parse, struct parsable_field *fields_to_parse,
+void index_one_mbox_line(unsigned int nb_fields_to_parse,
+                         struct parsable_field *fields_to_parse,
                          char *raw_mbox_line, FILE *db_file) {
   regmatch_t matches;
-  int f;
+  unsigned int f;
   for(f = 0; f < nb_fields_to_parse; f++) {
     if(regexec(&fields_to_parse[f].regexp, raw_mbox_line, 1, &matches, 0) == 0) {
       fprintf(db_file, "%s %s\n",
-              field_names[fields_to_parse[f].id],
+              field_keys[fields_to_parse[f].id],
               raw_mbox_line + matches.rm_eo);
     }
   }
@@ -574,13 +684,7 @@ void index_mbox(const char *mbox_filename,
   int in_header, new_header;
   unsigned long int position_in_file;
 
-  file = fopen(mbox_filename, "r");
-
-  if(!file) {
-    fprintf(stderr, "mymail: Cannot open '%s'.\n", mbox_filename);
-    if(paranoid) { exit(EXIT_FAILURE); }
-    return;
-  }
+  file = safe_fopen(mbox_filename, "r", "mbox for indexing");
 
   in_header = 0;
   new_header = 0;
@@ -591,17 +695,29 @@ void index_mbox(const char *mbox_filename,
 
   while(fgets(raw_mbox_line, BUFFER_SIZE, file)) {
     if(is_a_leading_from_line(raw_mbox_line)) {
+      /* This starts a new mail */
       if(in_header) {
         fprintf(stderr,
                 "Got a ^\"From \" in the header in %s:%lu.\n",
                 mbox_filename, position_in_file);
         fprintf(stderr, "%s", raw_mbox_line);
-        if(paranoid) { exit(EXIT_FAILURE); }
       }
+
+      /* printf("LEADING_LINE %s", raw_mbox_line); */
+
       in_header = 1;
       new_header = 1;
     } else if(raw_mbox_line[0] == '\n') {
-      if(in_header) { in_header = 0; }
+      if(in_header) {
+        in_header = 0;
+        /* We leave the header, index the current line */
+        if(full_line[0]) {
+          /* printf("INDEX %s\n", full_line); */
+          index_one_mbox_line(nb_fields_to_parse, fields_to_parse, full_line, db_file);
+        }
+        end_of_full_line = full_line;
+        *end_of_full_line = '\0';
+      }
     }
 
     if(in_header) {
@@ -611,6 +727,7 @@ void index_mbox(const char *mbox_filename,
       }
 
       if(raw_mbox_line[0] == ' ' || raw_mbox_line[0] == '\t') {
+        /* Continuation of a line */
         char *start = raw_mbox_line;
         while(*start == ' ' || *start == '\t') start++;
         *(end_of_full_line++) = ' ';
@@ -622,17 +739,10 @@ void index_mbox(const char *mbox_filename,
       }
 
       else {
-        /*
-          if(!((raw_mbox_line[0] >= 'a' && raw_mbox_line[0] <= 'z') ||
-          (raw_mbox_line[0] >= 'A' && raw_mbox_line[0] <= 'Z'))) {
-          fprintf(stderr,
-          "Header line syntax error %s:%lu.\n",
-          mbox_filename, position_in_file);
-          fprintf(stderr, "%s", raw_mbox_line);
-          }
-        */
+        /* Start a new header line, not a continuation */
 
         if(full_line[0]) {
+          /* printf("INDEX %s\n", full_line); */
           index_one_mbox_line(nb_fields_to_parse, fields_to_parse, full_line, db_file);
         }
 
@@ -653,7 +763,7 @@ void index_mbox(const char *mbox_filename,
 }
 
 void recursive_index_mbox(FILE *db_file,
-                          const char *entry_name,
+                          const char *entry_name, regex_t *mbox_filename_regexp,
                           int nb_fields_to_parse, struct parsable_field *fields_to_parse) {
   DIR *dir;
   struct dirent *dir_e;
@@ -674,12 +784,17 @@ void recursive_index_mbox(FILE *db_file,
     while((dir_e = readdir(dir))) {
       if(!ignore_entry(dir_e->d_name)) {
         snprintf(subname, PATH_MAX, "%s/%s", entry_name, dir_e->d_name);
-        recursive_index_mbox(db_file, subname, nb_fields_to_parse, fields_to_parse);
+        recursive_index_mbox(db_file, subname, mbox_filename_regexp,
+                             nb_fields_to_parse, fields_to_parse);
       }
     }
     closedir(dir);
   } else {
-    index_mbox(entry_name, nb_fields_to_parse, fields_to_parse, db_file);
+    const char *s = entry_name, *filename = s;
+    while(*s) { if(*s == '/') { filename = s+1; }; s++; }
+    if(!mbox_filename_regexp || regexec(mbox_filename_regexp, filename, 0, 0, 0) == 0) {
+      index_mbox(entry_name, nb_fields_to_parse, fields_to_parse, db_file);
+    }
   }
 }
 
@@ -695,23 +810,85 @@ static struct option long_options[] = {
   { "help", no_argument, 0, 'h' },
   { "version", no_argument, 0, 'v' },
   { "quiet", no_argument, 0, 'q' },
-  { "db-file", 1, 0, 'd' },
+  { "use-leading-time", no_argument, 0, 't' },
+  { "do-not-discard-mails-from-the-future", no_argument, 0, 'f' },
+  { "db-file-output", 1, 0, 'd' },
   { "db-pattern", 1, 0, 'p' },
   { "db-root", 1, 0, 'r' },
   { "db-list", 1, 0, 'l' },
+  { "mbox-pattern", 1, 0, 'm' },
   { "search", 1, 0, 's' },
   { "index", 0, 0, 'i' },
   { "output", 1, 0, 'o' },
   { "default-search", 1, 0, 'a' },
+  { "nb-mails-max", 1, 0, 'n' },
   { 0, 0, 0, 0 }
 };
 
+struct time_criterion {
+  char *label;
+  int day_criterion;
+  int start_hour, end_hour;
+  int past_week_day;
+};
+
+/*********************************************************************/
+
+static struct time_criterion time_criteria[] = {
+
+  { "1h",        0,  1,       -1, -1 },
+  { "2h",        0,  2,       -1, -1 },
+  { "4h",        0,  4,       -1, -1 },
+  { "8h",        0,  8,       -1, -1 },
+  { "24h",       0, 24,       -1, -1 },
+  { "48h",       0, 48,       -1, -1 },
+  { "week",      0, 24 *   7, -1, -1 },
+  { "2weeks",    0, 24 *  14, -1, -1 },
+  { "month",     0, 24 *  31, -1, -1 },
+  { "semester",  0, 24 * 185, -1, -1 },
+  { "trimester", 0, 24 *  92, -1, -1 },
+  { "year",      0, 24 * 365, -1, -1 },
+
+  { "yesterday", 1, -1,       -1, -1 },
+  { "today",     1, -1,       -1,  0 },
+
+  { "monday",    1, -1,       -1,  1 },
+  { "tuesday",   1, -1,       -1,  2 },
+  { "wednesday", 1, -1,       -1,  3 },
+  { "thursday",  1, -1,       -1,  4 },
+  { "friday",    1, -1,       -1,  5 },
+  { "saturday",  1, -1,       -1,  6 },
+  { "sunday",    1, -1,       -1,  7 },
+
+};
+
 /*********************************************************************/
 
-void init_condition(struct search_condition *condition, char *full_string) {
+time_t time_for_past_day(int day) {
+  struct tm *tm;
+  int delta_day;
+  tm = localtime(&global_current_time);
+  if(day > 0) {
+    delta_day = (7 + tm->tm_wday - day) % 7;
+  } else {
+    delta_day = - day;
+  }
+  return global_current_time - (delta_day * 3600 * 24 + tm->tm_sec + 60 * tm->tm_min + 3600 * tm->tm_hour);
+}
+
+void init_condition(struct search_condition *condition, const char *full_string,
+                    const char *default_search_field) {
   char full_search_field[TOKEN_BUFFER_SIZE], *search_field;
-  int m;
-  char *string;
+  unsigned int k, m;
+  const char *string;
+  struct alias_node *a;
+
+  for(a = global_alias_list; a; a = a->next) {
+    if(strcmp(full_string, a->alias) == 0) {
+      full_string = a->value;
+      break;
+    }
+  }
 
   string = parse_token(full_search_field, TOKEN_BUFFER_SIZE, ' ', full_string);
   search_field = full_search_field;
@@ -723,137 +900,142 @@ void init_condition(struct search_condition *condition, char *full_string) {
     condition->negation = 0;
   }
 
-  /* Recently */
-
-  if(strcmp(search_field, "8h") == 0) {
-    condition->field_id = ID_INTERVAL;
-    condition->interval_start = time(0) - 3600 * 8;
-    condition->interval_stop = 0;
-  }
-
-  else if(strcmp(search_field, "24h") == 0 ||
-          strcmp(search_field, "today") == 0) {
-    condition->field_id = ID_INTERVAL;
-    condition->interval_start = time(0) - 3600 * 24;
-    condition->interval_stop = 0;
-  }
-
-  else if(strcmp(search_field, "week") == 0) {
-    condition->field_id = ID_INTERVAL;
-    condition->interval_start = time(0) - 3600 * 24 * 7;
-    condition->interval_stop = 0;
-  }
-
-  else if(strcmp(search_field, "month") == 0) {
-    condition->field_id = ID_INTERVAL;
-    condition->interval_start = time(0) - 3600 * 24 * 31;
-    condition->interval_stop = 0;
-  }
-
-  else if(strcmp(search_field, "year") == 0) {
-    condition->field_id = ID_INTERVAL;
-    condition->interval_start = time(0) - 3600 * 24 * 365;
-    condition->interval_stop = 0;
-  }
-
-  /* Yesterday */
-
-  else if(strcmp(search_field, "yesterday") == 0) {
-    condition->field_id = ID_INTERVAL;
-    condition->interval_start = time(0) - 2 * 3600 * 24;
-    condition->interval_stop = condition->interval_start + 3600 * 24;
-  }
-
-  /* Week days */
-
-  else if(strcmp(search_field, "monday") == 0) {
-    condition->field_id = ID_INTERVAL;
-    condition->interval_start = time_for_past_day(1);
-    condition->interval_stop = condition->interval_start + 3600 * 24;
-  }
-
-  else if(strcmp(search_field, "tuesday") == 0) {
-    condition->field_id = ID_INTERVAL;
-    condition->interval_start = time_for_past_day(2);
-    condition->interval_stop = condition->interval_start + 3600 * 24;
-  }
-
-  else if(strcmp(search_field, "wednesday") == 0) {
-    condition->field_id = ID_INTERVAL;
-    condition->interval_start = time_for_past_day(3);
-    condition->interval_stop = condition->interval_start + 3600 * 24;
-  }
-
-  else if(strcmp(search_field, "thursday") == 0) {
-    condition->field_id = ID_INTERVAL;
-    condition->interval_start = time_for_past_day(4);
-    condition->interval_stop = condition->interval_start + 3600 * 24;
-  }
-
-  else if(strcmp(search_field, "friday") == 0) {
-    condition->field_id = ID_INTERVAL;
-    condition->interval_start = time_for_past_day(5);
-    condition->interval_stop = condition->interval_start + 3600 * 24;
-  }
-
-  else if(strcmp(search_field, "saturday") == 0) {
-    condition->field_id = ID_INTERVAL;
-    condition->interval_start = time_for_past_day(6);
-    condition->interval_stop = condition->interval_start + 3600 * 24;
-  }
+  condition->db_key = -1;
+
+  /* Time condition */
+
+  for(k = 0; k < sizeof(time_criteria) / sizeof(struct time_criterion); k++) {
+    if(strcmp(time_criteria[k].label, search_field) == 0) {
+      condition->db_key = ID_TIME_INTERVAL;
+      if(time_criteria[k].day_criterion) {
+        condition->time_start = time_for_past_day(time_criteria[k].past_week_day);
+        condition->time_stop = condition->time_start + 3600 * 24;
+      } else {
+        condition->time_start = global_current_time - 3600 * time_criteria[k].start_hour;
+        if(time_criteria[k].end_hour >= 0) {
+          condition->time_stop = global_current_time - 3600 * time_criteria[k].end_hour;
+        } else {
+          condition->time_stop = 0;
+        }
+      }
 
-  else if(strcmp(search_field, "sunday") == 0) {
-    condition->field_id = ID_INTERVAL;
-    condition->interval_start = time_for_past_day(7);
-    condition->interval_stop = condition->interval_start + 3600 * 24;
+      break;
+    }
   }
 
-  else {
-
-    /* header-related conditions */
+  if(condition->db_key == -1) {
 
-    condition->field_id = -1;
+    /* No time condition matched, look for the search fields */
 
-    for(m = 0; (m < MAX_ID) && condition->field_id == -1; m++) {
-      if(strncmp(field_names[m], search_field, strlen(search_field)) == 0) {
-        condition->field_id = m;
+    for(m = 0; (m < MAX_ID) && condition->db_key == -1; m++) {
+      if(strncmp(field_keys[m], search_field, strlen(search_field)) == 0) {
+        condition->db_key = m;
       }
     }
 
-    if(condition->field_id == -1) {
+    /* None match, if there is a default search field, re-run the search with it */
+
+    if(condition->db_key == -1) {
       if(default_search_field) {
-        for(m = 0; (m < MAX_ID) && condition->field_id == -1; m++) {
-          if(strncmp(field_names[m],
+        for(m = 0; (m < MAX_ID) && condition->db_key == -1; m++) {
+          if(strncmp(field_keys[m],
                      default_search_field, strlen(default_search_field)) == 0) {
-            condition->field_id = m;
+            condition->db_key = m;
           }
         }
         string = full_string;
+        if(string[0] == '!') { string++; }
       }
     }
 
-    if(condition->field_id == -1) {
+    if(condition->db_key == -1) {
       fprintf(stderr,
-              "mymail: Syntax error in field name \"%s\".\n",
+              "mymail: Syntax error in field key \"%s\".\n",
               search_field);
       exit(EXIT_FAILURE);
     }
 
-    if(regcomp(&condition->regexp,
+    if(regcomp(&condition->db_value_regexp,
                string,
                REG_ICASE)) {
       fprintf(stderr,
               "mymail: Syntax error in regexp \"%s\" for field \"%s\".\n",
               string,
-              field_names[condition->field_id]);
+              field_keys[condition->db_key]);
       exit(EXIT_FAILURE);
     }
   }
 }
 
 void free_condition(struct search_condition *condition) {
-  if(condition->field_id != ID_INTERVAL) {
-    regfree(&condition->regexp);
+  if(condition->db_key != ID_TIME_INTERVAL) {
+    regfree(&condition->db_value_regexp);
+  }
+}
+
+const char *eat_space(const char *s) {
+  while(*s == ' ' || *s == '\t') { s++; }
+  return s;
+}
+
+void read_rc_file(const char *rc_filename) {
+  char raw_line[BUFFER_SIZE];
+  char command[TOKEN_BUFFER_SIZE], tmp_token[TOKEN_BUFFER_SIZE];
+
+  FILE *rc_file;
+  int line_number;
+  const char *s;
+  char *t;
+
+  rc_file = fopen(rc_filename, "r");
+
+  if(rc_file) {
+    line_number = 1;
+    while(fgets(raw_line, BUFFER_SIZE, rc_file)) {
+      t = raw_line;
+      while(*t) { if(*t == '\n') { *t = '\0'; }; t++; }
+
+      s = raw_line;
+      s = eat_space(s);
+
+      if(*s && *s != '#') {
+        s = parse_token(command, TOKEN_BUFFER_SIZE, ' ', s);
+
+        if(strcmp(command, "alias") == 0) {
+          struct alias_node *a = safe_malloc(sizeof(struct alias_node));
+          a->next = global_alias_list;
+          global_alias_list = a;
+          if(s) {
+            s = eat_space(s);
+            s = parse_token(tmp_token, TOKEN_BUFFER_SIZE, '=', s);
+            a->alias = strdup(tmp_token);
+            if(s) {
+              s = eat_space(s);
+              a->value = strdup(s);
+            } else {
+              fprintf(stderr, "%s:%d syntax error, missing alias value.\n",
+                      rc_filename,
+                      line_number);
+              exit(EXIT_FAILURE);
+            }
+          } else {
+            fprintf(stderr, "%s:%d syntax error, missing alias key.\n",
+                    rc_filename,
+                    line_number);
+            exit(EXIT_FAILURE);
+          }
+        } else {
+          fprintf(stderr, "%s:%d syntax error, unknown command '%s'.\n",
+                  rc_filename,
+                  line_number,
+                  command);
+          exit(EXIT_FAILURE);
+        }
+      }
+
+      line_number++;
+    }
+    fclose(rc_file);
   }
 }
 
@@ -862,41 +1044,70 @@ void free_condition(struct search_condition *condition) {
 /*********************************************************************/
 
 int main(int argc, char **argv) {
-  char *db_filename;
-  char *db_filename_regexp_string;
-  char *db_root_path;
-  char *db_filename_list;
+  char *db_filename = 0;
+  char *db_filename_regexp_string = 0;
+  char *db_root_path = 0;
+  char *db_filename_list = 0;
+  char *mbox_filename_regexp_string = 0;
+  char *default_search_field;
   char output_filename[PATH_MAX + 1];
-  int action_index;
+  char rc_filename[PATH_MAX + 1];
+  int action_index = 0;
   int error = 0, show_help = 0;
-  const int nb_fields_to_parse = sizeof(fields_to_parse) / sizeof(struct parsable_field);
+  const unsigned int nb_fields_to_parse =
+    sizeof(fields_to_parse) / sizeof(struct parsable_field);
   char c;
-  int f, n;
-  int nb_search_conditions;
-  FILE *output_file;
+  unsigned int f, n;
+  unsigned int nb_search_conditions;
   struct search_condition search_conditions[MAX_NB_SEARCH_CONDITIONS];
+  struct alias_node *a, *b;
 
-  if(regcomp(&leading_from_line_regexp, LEADING_FROM_LINE_REGEXP, 0)) {
+  /* Group and others have no access */
+  umask(S_IRWXG | S_IRWXO);
+
+  if(regcomp(&global_leading_from_line_regexp, LEADING_FROM_LINE_REGEXP_STRING, 0)) {
     fprintf(stderr,
             "mymail: Cannot compile leading \"from\" line regexp. That is strange.\n");
     exit(EXIT_FAILURE);
   }
 
-  paranoid = 0;
-  action_index = 0;
-  db_filename = 0;
-  db_filename_regexp_string = 0;
-  db_root_path = 0;
-  db_filename_list = 0;
-  quiet = 0;
+  if(getenv("MYMAILRC")) {
+    sprintf(rc_filename, "%s", getenv("MYMAILRC"));
+  } else if(getenv("HOME")) {
+    sprintf(rc_filename, "%s/.mymailrc", getenv("HOME"));
+  } else {
+    rc_filename[0] = '\0';
+  }
+
+  global_alias_list = 0;
+  global_quiet = 0;
+  global_use_leading_time = 0;
+  global_nb_mails_max = 250;
+  global_discard_mail_from_the_future = 1;
+  global_current_time = time(0);
+
   default_search_field = 0;
-  ignore_dot_files = 1;
+  strncpy(output_filename, "", PATH_MAX);
+
+  if(rc_filename[0]) {
+    read_rc_file(rc_filename);
+  }
+
+  /*
+    {
+    #warning Test code added on 2013 May 02 11:17:01
+    struct alias_node *a;
+    for(a = global_alias_list; a; a = a->next) {
+    printf ("ALIAS [%s] [%s]\n", a->alias, a->value);
+    }
+    }
+  */
 
   setlocale(LC_ALL, "");
 
   nb_search_conditions = 0;
 
-  while ((c = getopt_long(argc, argv, "hvqip:s:d:r:l:o:a:",
+  while ((c = getopt_long(argc, argv, "hvqtfip:s:d:r:l:o:a:m:",
                           long_options, NULL)) != -1) {
 
     switch(c) {
@@ -910,7 +1121,15 @@ int main(int argc, char **argv) {
       break;
 
     case 'q':
-      quiet = 1;
+      global_quiet = 1;
+      break;
+
+    case 't':
+      global_use_leading_time = 1;
+      break;
+
+    case 'f':
+      global_discard_mail_from_the_future = 0;
       break;
 
     case 'i':
@@ -918,22 +1137,46 @@ int main(int argc, char **argv) {
       break;
 
     case 'd':
+      if(db_filename) {
+        fprintf(stderr, "mymail: Can not set the db filename twice.\n");
+        exit(EXIT_FAILURE);
+      }
       db_filename = strdup(optarg);
       break;
 
     case 'p':
+      if(db_filename_regexp_string) {
+        fprintf(stderr, "mymail: Can not set the db filename pattern twice.\n");
+        exit(EXIT_FAILURE);
+      }
       db_filename_regexp_string = strdup(optarg);
       break;
 
+    case 'm':
+      if(mbox_filename_regexp_string) {
+        fprintf(stderr, "mymail: Can not set the mbox filename pattern twice.\n");
+        exit(EXIT_FAILURE);
+      }
+      mbox_filename_regexp_string = strdup(optarg);
+      break;
+
     case 'o':
       strncpy(output_filename, optarg, PATH_MAX);
       break;
 
     case 'r':
+      if(db_root_path) {
+        fprintf(stderr, "mymail: Can not set the db root path twice.\n");
+        exit(EXIT_FAILURE);
+      }
       db_root_path = strdup(optarg);
       break;
 
     case 'l':
+      if(db_filename_list) {
+        fprintf(stderr, "mymail: Can not set the db filename list twice.\n");
+        exit(EXIT_FAILURE);
+      }
       db_filename_list = strdup(optarg);
       break;
 
@@ -942,7 +1185,7 @@ int main(int argc, char **argv) {
         fprintf(stderr, "mymail: Too many search patterns.\n");
         exit(EXIT_FAILURE);
       }
-      init_condition(&search_conditions[nb_search_conditions], optarg);
+      init_condition(&search_conditions[nb_search_conditions], optarg, default_search_field);
       nb_search_conditions++;
       break;
 
@@ -950,86 +1193,72 @@ int main(int argc, char **argv) {
       default_search_field = optarg;
       break;
 
+    case 'n':
+      global_nb_mails_max = atoi(optarg);
+      break;
+
     default:
       error = 1;
       break;
     }
   }
 
-  if(!db_filename) {
-    char *default_db_filename = getenv("MYMAIL_DB_FILE");
-
-    if(!default_db_filename) {
-      default_db_filename = "mymail.db";
-    }
-
-    db_filename = strdup(default_db_filename);
+  if(error) {
+    print_usage(stderr);
+    exit(EXIT_FAILURE);
   }
 
-  if(!db_filename_regexp_string) {
-    char *default_db_filename_regexp_string = getenv("MYMAIL_DB_PATTERN");
-
-    if(!default_db_filename_regexp_string) {
-      default_db_filename_regexp_string = "^mymail.db$";
-    }
-
-    db_filename_regexp_string = strdup(default_db_filename_regexp_string);
+  if(show_help) {
+    print_usage(stdout);
+    exit(EXIT_SUCCESS);
   }
 
-  if(!db_root_path) {
-    char *default_db_root_path = getenv("MYMAIL_DB_ROOT");
+  /* Set all the values that may defined in the arguments, through
+     environment variables, or hard-coded */
 
-    if(default_db_root_path) {
-      db_root_path = strdup(default_db_root_path);
-    }
-  }
+  db_filename = default_value(db_filename,
+                              "MYMAIL_DB_FILE",
+                              "mymail.db");
 
-  if(!db_filename_list) {
-    char *default_db_filename_list = getenv("MYMAIL_DB_LIST");
+  db_filename_regexp_string = default_value(db_filename_regexp_string,
+                                            "MYMAIL_DB_FILE",
+                                            "\\.db$");
 
-    if(default_db_filename_list) {
-      db_filename_list = strdup(default_db_filename_list);
-    }
-  }
+  db_root_path = default_value(db_root_path,
+                               "MYMAIL_DB_ROOT",
+                               0);
 
-  if(output_filename[0]) {
-    output_file = fopen(output_filename, "w");
+  db_filename_list = default_value(db_filename_list,
+                                   "MYMAIL_DB_LIST",
+                                   0);
 
-    if(!output_file) {
-      fprintf(stderr,
-              "mymail: Cannot open result file \"%s\" for writing: %s\n",
-              output_filename,
-              strerror(errno));
-      exit(EXIT_FAILURE);
-    }
-  } else {
-    output_file = stdout;
-    quiet = 1;
-  }
+  mbox_filename_regexp_string = default_value(mbox_filename_regexp_string,
+                                              "MYMAIL_MBOX_PATTERN",
+                                              0);
 
-  if(error) {
-    print_usage(stderr);
-    exit(EXIT_FAILURE);
-  }
-
-  if(show_help) {
-    print_usage(stdout);
-    exit(EXIT_SUCCESS);
-  }
+  /* mbox indexing */
 
   if(action_index) {
     FILE *db_file;
+    regex_t mbox_filename_regexp_static;
+    regex_t *mbox_filename_regexp;
 
-    db_file = fopen(db_filename, "w");
-
-    if(!db_file) {
-      fprintf(stderr,
-              "mymail: Cannot open \"%s\" for writing: %s\n",
-              db_filename,
-              strerror(errno));
-      exit(EXIT_FAILURE);
+    if(mbox_filename_regexp_string) {
+      if(regcomp(&mbox_filename_regexp_static,
+                 mbox_filename_regexp_string,
+                 0)) {
+        fprintf(stderr,
+                "mymail: Syntax error in regexp \"%s\".\n",
+                mbox_filename_regexp_string);
+        exit(EXIT_FAILURE);
+      }
+      mbox_filename_regexp = &mbox_filename_regexp_static;
+    } else {
+      mbox_filename_regexp = 0;
     }
 
+    db_file = safe_fopen(db_filename, "w", "index file for indexing");
+
     for(f = 0; f < nb_fields_to_parse; f++) {
       if(regcomp(&fields_to_parse[f].regexp,
                  fields_to_parse[f].regexp_string,
@@ -1037,16 +1266,20 @@ int main(int argc, char **argv) {
         fprintf(stderr,
                 "mymail: Syntax error in regexp \"%s\" for field \"%s\".\n",
                 fields_to_parse[f].regexp_string,
-                field_names[fields_to_parse[f].id]);
+                field_keys[fields_to_parse[f].id]);
         exit(EXIT_FAILURE);
       }
     }
 
-    fprintf(db_file, "%s version_%s raw\n", MYMAIL_DB_MAGIC_TOKEN, VERSION);
+    fprintf(db_file,
+            "%s version_%s format_%d raw\n",
+            MYMAIL_DB_MAGIC_TOKEN,
+            MYMAIL_VERSION,
+            MYMAIL_DB_FORMAT_VERSION);
 
     while(optind < argc) {
       recursive_index_mbox(db_file,
-                           argv[optind],
+                           argv[optind], mbox_filename_regexp,
                            nb_fields_to_parse, fields_to_parse);
       optind++;
     }
@@ -1054,13 +1287,29 @@ int main(int argc, char **argv) {
     fflush(db_file);
     fclose(db_file);
 
+    if(mbox_filename_regexp) {
+      regfree(mbox_filename_regexp);
+    }
+
     for(f = 0; f < nb_fields_to_parse; f++) {
       regfree(&fields_to_parse[f].regexp);
     }
   }
 
+  /* Mail search */
+
   else {
 
+    FILE *output_file;
+    int nb_extracted_mails = 0;
+
+    if(output_filename[0]) {
+      output_file = safe_fopen(output_filename, "w", "result mbox");
+    } else {
+      output_file = stdout;
+      global_quiet = 1;
+    }
+
     if(nb_search_conditions > 0) {
 
       /* Recursive search if db_root_path is set */
@@ -1076,9 +1325,10 @@ int main(int argc, char **argv) {
           exit(EXIT_FAILURE);
         }
 
-        recursive_search_in_db(db_root_path, &db_filename_regexp,
-                               nb_search_conditions, search_conditions,
-                               output_file);
+        nb_extracted_mails = recursive_search_in_db(db_root_path, &db_filename_regexp,
+                                                    nb_extracted_mails,
+                                                    nb_search_conditions, search_conditions,
+                                                    output_file);
 
         regfree(&db_filename_regexp);
       }
@@ -1087,7 +1337,7 @@ int main(int argc, char **argv) {
 
       if(db_filename_list) {
         char db_filename[PATH_MAX + 1];
-        char *s;
+        const char *s;
 
         s = db_filename_list;
 
@@ -1095,7 +1345,10 @@ int main(int argc, char **argv) {
           s = parse_token(db_filename, PATH_MAX + 1, ';', s);
 
           if(db_filename[0]) {
-            search_in_db(db_filename, nb_search_conditions, search_conditions, output_file);
+            nb_extracted_mails =
+              search_in_db(db_filename,
+                           nb_extracted_mails,
+                           nb_search_conditions, search_conditions, output_file);
           }
         }
       }
@@ -1103,27 +1356,49 @@ int main(int argc, char **argv) {
       /* Search in all db files listed in the command arguments */
 
       while(optind < argc) {
-        search_in_db(argv[optind], nb_search_conditions, search_conditions, output_file);
+        nb_extracted_mails =
+          search_in_db(argv[optind],
+                       nb_extracted_mails,
+                       nb_search_conditions, search_conditions, output_file);
         optind++;
       }
     }
+
+    if(!global_quiet) {
+      if(nb_extracted_mails > 0) {
+        printf("Found %d matching mails.\n", nb_extracted_mails);
+      } else {
+        printf("No matching mail found.\n");
+      }
+    }
+
+    fflush(output_file);
+
+    if(output_file != stdout) {
+      fclose(output_file);
+    }
   }
 
   for(n = 0; n < nb_search_conditions; n++) {
     free_condition(&search_conditions[n]);
   }
 
-  if(output_file != stdout) {
-    fflush(output_file);
-    fclose(output_file);
+  a = global_alias_list;
+  while(a) {
+    b = a->next;
+    free(a->alias);
+    free(a->value);
+    free(a);
+    a = b;
   }
 
   free(db_filename);
   free(db_filename_regexp_string);
   free(db_root_path);
   free(db_filename_list);
+  free(mbox_filename_regexp_string);
 
-  regfree(&leading_from_line_regexp);
+  regfree(&global_leading_from_line_regexp);
 
   exit(EXIT_SUCCESS);
 }