escape and descape aql history

aql2/src/prompt/Prompt.cpp

@@ -7,11 +7,76 @@
 #include "Prompt.h"
+char esc_char [] = { '\a', '\b', '\f', '\n', '\r', '\t', '\v', '\\' };
+char essc_str [] = {  'a',  'b',  'f',  'n',  'r',  't',  'v', '\\' };
+size_t esc_char_size = sizeof ( esc_char );
+
+char * descape ( const char * buffer ) {
+	size_t l = strlen ( buffer );
+
+	char * dest = ( char * ) malloc ( ( l + 1 ) * sizeof ( char ) );
+	char * ptr = dest;
+	for ( size_t i = 0; i < l; ++ i ) {
+		if ( buffer [ i ] == '\\' ) {
+			++ i;
+			size_t j = std::find ( essc_str, essc_str + esc_char_size, buffer [ i ] ) - essc_str;
+			if ( j == esc_char_size ) {
+				free ( dest );
+				return strdup ( buffer );
+			}
+			* ptr ++ = esc_char [ j ];
+		} else {
+			* ptr ++ = buffer [ i ];
+		}
+	}
+	* ptr = '\0';
+
+	return dest;
+}
+
+char * escape ( const char * buffer){
+	size_t l = strlen ( buffer );
+
+	char * dest = ( char * ) malloc ( ( l * 2 + 1 ) * sizeof ( char ) );
+	char * ptr = dest;
+	for ( size_t i = 0; i < l; ++ i ) {
+		size_t j = std::find ( esc_char, esc_char + esc_char_size, buffer [ i ] ) - esc_char;
+		if ( j == esc_char_size ) {
+			* ptr ++ = buffer [ i ];
+		} else {
+			* ptr ++ = '\\';
+			* ptr ++ = essc_str [ j ];
+		}
+	}
+	* ptr = '\0';
+
+	return dest;
+}
+
 Prompt::Prompt ( cli::Environment environment ) : m_history_file ( std::string ( std::getenv ( "HOME" ) ) + "/.aql_history" ), m_environment ( std::move ( environment ) ) {
 	read_history ( m_history_file.c_str ( ) );
+
+	HIST_ENTRY ** history = history_list ( );
+	int i = 0;
+	if ( history ) while ( * history ) {
+		char * tmp = descape ( ( * history )->line );
+		replace_history_entry ( i, tmp, ( * history )->data );
+		free ( tmp );
+		++ history;
+		++ i;
+	}
 }
 Prompt::~Prompt ( ) {
+	HIST_ENTRY ** history = history_list ( );
+	int i = 0;
+	if ( history ) while ( * history ) {
+		char * tmp = escape ( ( * history )->line );
+		replace_history_entry ( i, tmp, ( * history )->data );
+		free ( tmp );
+		++ history;
+		++ i;
+	}
 	write_history ( m_history_file.c_str ( ) );
 }