use cheap caching by choosing the buffer - iomenu - interactive terminal-based selection menu
 (HTM) git clone git://bitreich.org/iomenu git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/iomenu
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       ---
 (DIR) commit 00bb578f57d039ac6e6c2ce2835da575c78c76f3
 (DIR) parent d189ed552264d9b402a8b62c09ff38597944f734
 (HTM) Author: Josuah Demangeon <mail@josuah.net>
       Date:   Thu, 18 Jan 2018 02:10:39 +0100
       
       use cheap caching by choosing the buffer
       
       Diffstat:
         M iomenu.c                            |      31 ++++++++++++++++---------------
       
       1 file changed, 16 insertions(+), 15 deletions(-)
       ---
 (DIR) diff --git a/iomenu.c b/iomenu.c
       @@ -161,26 +161,27 @@ tokenize(char **tokv, char *str)
        
        /*
         * First split input into token, then match every token independently against
       - * every line.  The matching lines fills matchv.
       + * every line.  The matching lines fills matchv.  Matches are searched inside
       + * of `searchv' of size `searchc'
         */
        static void
       -filter(void)
       +filter(int searchc, char **searchv)
        {
       -        extern char        **linev, **matchv;
       -        extern int        linec, matchc, cur;
       +        extern char        **matchv;
       +        extern int        matchc, cur;
        
                int        n;
                char        *tokv[sizeof(input) / 2 * sizeof(char *) + sizeof(NULL)];
                char        *s, buf[sizeof(input)];
        
       -        cur = 0;
                strncpy(buf, input, sizeof(input));
                buf[sizeof(input) - 1] = '\0';
                tokenize(tokv, buf);
       -        matchc = 0;
       -        for (n = 0; n < linec; n++)
       -                if (match_line(linev[n], tokv))
       -                        matchv[matchc++] = linev[n];
       +
       +        cur = matchc = 0;
       +        for (n = 0; n < searchc; n++)
       +                if (match_line(searchv[n], tokv))
       +                        matchv[matchc++] = searchv[n];
                if (flag_hs && matchv[cur][0] == '#')
                        move(+1);
        }
       @@ -214,7 +215,7 @@ remove_word()
                len = strlen(input) - 1;
                for (i = len; i >= 0 && !isspace(input[i]); i--)
                        input[i] = '\0';
       -        filter();
       +        filter(linec, linev);
        }
        
        static void
       @@ -229,7 +230,7 @@ add_char(char c)
                        input[len]     = c;
                        input[len + 1] = '\0';
                }
       -        filter();
       +        filter(matchc, matchv);
        }
        
        static void
       @@ -272,7 +273,7 @@ top:
                        return -1;
                case CTL('U'):
                        input[0] = '\0';
       -                filter();
       +                filter(linec, linev);
                        break;
                case CTL('W'):
                        remove_word();
       @@ -280,7 +281,7 @@ top:
                case 127:
                case CTL('H'):  /* backspace */
                        input[strlen(input) - 1] = '\0';
       -                filter();
       +                filter(linec, linev);
                        break;
                case CSI('A'):  /* up */
                case CTL('P'):
       @@ -309,7 +310,7 @@ top:
                                strncpy(input, matchv[cur], sizeof(input));
                                input[sizeof(input) - 1] = '\0';
                        }
       -                filter();
       +                filter(matchc, matchv);
                        break;
                case CTL('J'):  /* enter */
                case CTL('M'):
       @@ -499,7 +500,7 @@ main(int argc, char *argv[])
        
                parse_opt(argc, argv);
                read_stdin();
       -        filter();
       +        filter(linec, linev);
                if (!freopen("/dev/tty", "r", stdin))
                        die("freopen /dev/tty");
                if (!freopen("/dev/tty", "w", stderr))