Added example for hiding secret information

examples/cli.c

@@ -21,6 +21,7 @@
 
 #include "editline.h"
 #include <string.h>
+#include <regex.h>
 
 #define HISTORY "/tmp/.cli-history"
 
@@ -116,6 +117,33 @@ el_status_t do_suspend(void)
     return CSstay;
 }
 
+static int my_rl_check_secret(const char* source)
+{
+    const char* pattern = (char *)"^unlock\\s";
+    regex_t regex;
+
+    int reti;
+    int rez = 0;
+
+    if (!pattern || !source)
+        return rez;
+
+    /* Compile regular expression */
+    reti = regcomp(&regex, pattern, 0);
+    if (reti) // If couldn't compile regex
+        return rez;
+
+    /* Execute regular expression */
+    reti = regexec(&regex, source, 0, NULL, 0);
+    if (!reti) // If regex match
+        rez = 1;
+
+    /* Free memory allocated to the pattern buffer by regcomp() */
+    regfree(&regex);
+
+    return rez;
+}
+
 int main(void)
 {
     char *line;
@@ -124,6 +152,7 @@ int main(void)
     /* Setup callbacks */
     rl_set_complete_func(&my_rl_complete);
     rl_set_list_possib_func(&my_rl_list_possib);
+    rl_set_check_secret_func(&my_rl_check_secret);
     el_bind_key('?', list_possible);
     el_bind_key(CTL('C'), do_break);
     el_bind_key(CTL('D'), do_exit);