draw.c

   1 #include <stdlib.h>
   2 #include <string.h>
   3 #include <stdio.h>
   4 #include <sys/ioctl.h>
   5
   6 #include "main.h"
   7
   8
   9 /*
  10  * Print a line to stderr.
  11  */
  12 void
  13 draw_line(Line *line, int current, int cols, Opt *opt)
  14 {
  15         size_t i;
  16         int n = 0;
  17         char *content = expand_tabs(line->content);
  18         char *comment = expand_tabs(line->comment);
  19
  20         /* clean the line and add a small margin */
  21         fputs("\033[K", stderr);
  22
  23         /* line number if option set */
  24         if (opt->line_numbers) {
  25                 fputs(current ? "\033[1m" : "\033[1;30m", stderr);
  26                 fprintf(stderr, "%7d\033[0m ", line->number);
  27                 n += 8;
  28         } else {
  29                 fputs("  ", stderr);
  30                 n += 2;
  31         }
  32
  33         /* highlight current line */
  34         if (current)
  35                 fputs("\033[1;33m", stderr);
  36
  37         /* print content without overflowing terminal width */
  38         for (i = 0; i < strlen(content) && n < cols; n++, i++)
  39                 fputc(content[i], stderr);
  40
  41         /* shift without overflowing terminal width */
  42         if (!line->header && line->comment[0] != '\0') {
  43                 fprintf(stderr, "\033[%dC", MAX(40 - n, 1));
  44                 n += MAX(40 - n, 1);
  45         }
  46
  47         /* comments in grey */
  48         fputs("\033[1;30m", stderr);
  49
  50         /* print comment without overflowing terminal width */
  51         for (i = 0; i < strlen(comment) && n < cols; n++, i++)
  52                 fputc(comment[i], stderr);
  53
  54         fputs("\033[0m\n", stderr);
  55
  56         free(content);
  57         free(comment);
  58 }
  59
  60
  61 /*
  62  * Print all the lines from an array of pointer to lines.
  63  *
  64  * The total number oflines printed shall not excess 'count'.
  65  */
  66 void
  67 draw_lines(Buffer *buffer, int count, int cols, Opt *opt)
  68 {
  69         Line *line = buffer->current;
  70         int i = 0;
  71         int j = 0;
  72
  73         /* seek back from current line to the first line to print */
  74         while (line && i < count - OFFSET) {
  75                 i    = line->matches ? i + 1 : i;
  76                 line = line->prev;
  77         }
  78         line = line ? line : buffer->first;
  79
  80         /* print up to count lines that match the input */
  81         while (line && j < count) {
  82                 if (line->matches) {
  83                         draw_line(line, line == buffer->current, cols, opt);
  84                         j++;
  85                 }
  86
  87                 line = line->next;
  88         }
  89
  90         /* continue up to the end of the screen clearing it */
  91         for (; j < count; j++)
  92                 fputs("\r\033[K\n", stderr);
  93 }
  94
  95
  96 /*
  97  * Update the screen interface and print all candidates.
  98  *
  99  * This also has to clear the previous lines.
 100  */
 101 void
 102 draw_screen(Buffer *buffer, int tty_fd, Opt *opt)
 103 {
 104         struct winsize w;
 105         int count;
 106
 107         ioctl(tty_fd, TIOCGWINSZ, &w);
 108         count = MIN(opt->lines, w.ws_row - 2);
 109
 110         fputs("\n", stderr);
 111         draw_lines(buffer, count, w.ws_col, opt);
 112
 113         /* go up to the prompt position and update it */
 114         fprintf(stderr, "\033[%dA", count + 1);
 115         draw_prompt(buffer, w.ws_col, opt);
 116 }
 117
 118
 119 void
 120 draw_clear(int lines)
 121 {
 122         int i;
 123
 124         for (i = 0; i < lines + 1; i++)
 125                 fputs("\r\033[K\n", stderr);
 126         fprintf(stderr, "\033[%dA", lines + 1);
 127 }
 128
 129
 130 /*
 131  * Print the prompt, before the input, with the number of candidates that
 132  * match.
 133  */
 134 void
 135 draw_prompt(Buffer *buffer, int cols, Opt *opt)
 136 {
 137         size_t  i;
 138         int     matching = buffer->matching;
 139         int     total    = buffer->total;
 140         char   *input    = expand_tabs(buffer->input);
 141         char   *suggest  = expand_tabs(buffer->current->content);
 142
 143         /* for the '/' separator between the numbers */
 144         cols--;
 145
 146         /* number of digits */
 147         for (i = matching; i; i /= 10, cols--);
 148         for (i = total;    i; i /= 10, cols--);
 149
 150         /* 0 also has one digit*/
 151         cols -= !matching ? 1 : 0;
 152
 153         /* actual prompt */
 154         fprintf(stderr, "\r%s\033[K> ", opt->prompt);
 155         cols -= 2 + strlen(opt->prompt);
 156
 157         /* input without overflowing terminal width */
 158         for (i = 0; i < strlen(input) && cols > 0; cols--, i++)
 159                 fputc(input[i], stderr);
 160
 161         /* save the cursor position at the end of the input */
 162         fputs("\033[s", stderr);
 163
 164         /* grey */
 165         fputs("\033[1;30m", stderr);
 166
 167         /* suggest without overflowing terminal width */
 168         if (opt->complete) {
 169                 for (; i < strlen(suggest) && cols > 0; cols--, i++)
 170                         fputc(suggest[i], stderr);
 171         }
 172
 173         /* go to the end of the line */
 174         fprintf(stderr, "\033[%dC", cols);
 175
 176         /* total match and line count at the end of the line */
 177         fprintf(stderr, "%d/%d", matching, total);
 178
 179         /* restore cursor position at the end of the input */
 180         fputs("\033[0m\033[u", stderr);
 181
 182         free(input);
 183         free(suggest);
 184 }