column.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "column.h"
   4 #include "string-list.h"
   5 #include "parse-options.h"
   6 #include "run-command.h"
   7 #include "utf8.h"
   8
   9 #define XY2LINEAR(d, x, y) (COL_LAYOUT((d)->colopts) == COL_COLUMN ? \
  10                             (x) * (d)->rows + (y) : \
  11                             (y) * (d)->cols + (x))
  12
  13 struct column_data {
  14         const struct string_list *list;
  15         unsigned int colopts;
  16         struct column_options opts;
  17
  18         int rows, cols;
  19         int *len;               /* cell length */
  20         int *width;           /* index to the longest row in column */
  21 };
  22
  23 /* return length of 's' in letters, ANSI escapes stripped */
  24 static int item_length(const char *s)
  25 {
  26         return utf8_strnwidth(s, -1, 1);
  27 }
  28
  29 /*
  30  * Calculate cell width, rows and cols for a table of equal cells, given
  31  * table width and how many spaces between cells.
  32  */
  33 static void layout(struct column_data *data, int *width)
  34 {
  35         int i;
  36
  37         *width = 0;
  38         for (i = 0; i < data->list->nr; i++)
  39                 if (*width < data->len[i])
  40                         *width = data->len[i];
  41
  42         *width += data->opts.padding;
  43
  44         data->cols = (data->opts.width - strlen(data->opts.indent)) / *width;
  45         if (data->cols == 0)
  46                 data->cols = 1;
  47
  48         data->rows = DIV_ROUND_UP(data->list->nr, data->cols);
  49 }
  50
  51 static void compute_column_width(struct column_data *data)
  52 {
  53         int i, x, y;
  54         for (x = 0; x < data->cols; x++) {
  55                 data->width[x] = XY2LINEAR(data, x, 0);
  56                 for (y = 0; y < data->rows; y++) {
  57                         i = XY2LINEAR(data, x, y);
  58                         if (i < data->list->nr &&
  59                             data->len[data->width[x]] < data->len[i])
  60                                 data->width[x] = i;
  61                 }
  62         }
  63 }
  64
  65 /*
  66  * Shrink all columns by shortening them one row each time (and adding
  67  * more columns along the way). Hopefully the longest cell will be
  68  * moved to the next column, column is shrunk so we have more space
  69  * for new columns. The process ends when the whole thing no longer
  70  * fits in data->total_width.
  71  */
  72 static void shrink_columns(struct column_data *data)
  73 {
  74         REALLOC_ARRAY(data->width, data->cols);
  75         while (data->rows > 1) {
  76                 int x, total_width, cols, rows;
  77                 rows = data->rows;
  78                 cols = data->cols;
  79
  80                 data->rows--;
  81                 data->cols = DIV_ROUND_UP(data->list->nr, data->rows);
  82                 if (data->cols != cols)
  83                         REALLOC_ARRAY(data->width, data->cols);
  84                 compute_column_width(data);
  85
  86                 total_width = strlen(data->opts.indent);
  87                 for (x = 0; x < data->cols; x++) {
  88                         total_width += data->len[data->width[x]];
  89                         total_width += data->opts.padding;
  90                 }
  91                 if (total_width > data->opts.width) {
  92                         data->rows = rows;
  93                         data->cols = cols;
  94                         break;
  95                 }
  96         }
  97         compute_column_width(data);
  98 }
  99
 100 /* Display without layout when not enabled */
 101 static void display_plain(const struct string_list *list,
 102                           const char *indent, const char *nl)
 103 {
 104         int i;
 105
 106         for (i = 0; i < list->nr; i++)
 107                 printf("%s%s%s", indent, list->items[i].string, nl);
 108 }
 109
 110 /* Print a cell to stdout with all necessary leading/trailing space */
 111 static int display_cell(struct column_data *data, int initial_width,
 112                         const char *empty_cell, int x, int y)
 113 {
 114         int i, len, newline;
 115
 116         i = XY2LINEAR(data, x, y);
 117         if (i >= data->list->nr)
 118                 return -1;
 119
 120         len = data->len[i];
 121         if (data->width && data->len[data->width[x]] < initial_width) {
 122                 /*
 123                  * empty_cell has initial_width chars, if real column
 124                  * is narrower, increase len a bit so we fill less
 125                  * space.
 126                  */
 127                 len += initial_width - data->len[data->width[x]];
 128                 len -= data->opts.padding;
 129         }
 130
 131         if (COL_LAYOUT(data->colopts) == COL_COLUMN)
 132                 newline = i + data->rows >= data->list->nr;
 133         else
 134                 newline = x == data->cols - 1 || i == data->list->nr - 1;
 135
 136         printf("%s%s%s",
 137                x == 0 ? data->opts.indent : "",
 138                data->list->items[i].string,
 139                newline ? data->opts.nl : empty_cell + len);
 140         return 0;
 141 }
 142
 143 /* Display COL_COLUMN or COL_ROW */
 144 static void display_table(const struct string_list *list,
 145                           unsigned int colopts,
 146                           const struct column_options *opts)
 147 {
 148         struct column_data data;
 149         int x, y, i, initial_width;
 150         char *empty_cell;
 151
 152         memset(&data, 0, sizeof(data));
 153         data.list = list;
 154         data.colopts = colopts;
 155         data.opts = *opts;
 156
 157         ALLOC_ARRAY(data.len, list->nr);
 158         for (i = 0; i < list->nr; i++)
 159                 data.len[i] = item_length(list->items[i].string);
 160
 161         layout(&data, &initial_width);
 162
 163         if (colopts & COL_DENSE)
 164                 shrink_columns(&data);
 165
 166         empty_cell = xmallocz(initial_width);
 167         memset(empty_cell, ' ', initial_width);
 168         for (y = 0; y < data.rows; y++) {
 169                 for (x = 0; x < data.cols; x++)
 170                         if (display_cell(&data, initial_width, empty_cell, x, y))
 171                                 break;
 172         }
 173
 174         free(data.len);
 175         free(data.width);
 176         free(empty_cell);
 177 }
 178
 179 void print_columns(const struct string_list *list, unsigned int colopts,
 180                    const struct column_options *opts)
 181 {
 182         struct column_options nopts;
 183
 184         if (!list->nr)
 185                 return;
 186         assert((colopts & COL_ENABLE_MASK) != COL_AUTO);
 187
 188         memset(&nopts, 0, sizeof(nopts));
 189         nopts.indent = opts && opts->indent ? opts->indent : "";
 190         nopts.nl = opts && opts->nl ? opts->nl : "\n";
 191         nopts.padding = opts ? opts->padding : 1;
 192         nopts.width = opts && opts->width ? opts->width : term_columns() - 1;
 193         if (!column_active(colopts)) {
 194                 display_plain(list, "", "\n");
 195                 return;
 196         }
 197         switch (COL_LAYOUT(colopts)) {
 198         case COL_PLAIN:
 199                 display_plain(list, nopts.indent, nopts.nl);
 200                 break;
 201         case COL_ROW:
 202         case COL_COLUMN:
 203                 display_table(list, colopts, &nopts);
 204                 break;
 205         default:
 206                 BUG("invalid layout mode %d", COL_LAYOUT(colopts));
 207         }
 208 }
 209
 210 int finalize_colopts(unsigned int *colopts, int stdout_is_tty)
 211 {
 212         if ((*colopts & COL_ENABLE_MASK) == COL_AUTO) {
 213                 if (stdout_is_tty < 0)
 214                         stdout_is_tty = isatty(1);
 215                 *colopts &= ~COL_ENABLE_MASK;
 216                 if (stdout_is_tty || pager_in_use())
 217                         *colopts |= COL_ENABLED;
 218         }
 219         return 0;
 220 }
 221
 222 struct colopt {
 223         const char *name;
 224         unsigned int value;
 225         unsigned int mask;
 226 };
 227
 228 #define LAYOUT_SET 1
 229 #define ENABLE_SET 2
 230
 231 static int parse_option(const char *arg, int len, unsigned int *colopts,
 232                         int *group_set)
 233 {
 234         struct colopt opts[] = {
 235                 { "always", COL_ENABLED,  COL_ENABLE_MASK },
 236                 { "never",  COL_DISABLED, COL_ENABLE_MASK },
 237                 { "auto",   COL_AUTO,     COL_ENABLE_MASK },
 238                 { "plain",  COL_PLAIN,    COL_LAYOUT_MASK },
 239                 { "column", COL_COLUMN,   COL_LAYOUT_MASK },
 240                 { "row",    COL_ROW,      COL_LAYOUT_MASK },
 241                 { "dense",  COL_DENSE,    0 },
 242         };
 243         int i;
 244
 245         for (i = 0; i < ARRAY_SIZE(opts); i++) {
 246                 int set = 1, arg_len = len, name_len;
 247                 const char *arg_str = arg;
 248
 249                 if (!opts[i].mask) {
 250                         if (arg_len > 2 && !strncmp(arg_str, "no", 2)) {
 251                                 arg_str += 2;
 252                                 arg_len -= 2;
 253                                 set = 0;
 254                         }
 255                 }
 256
 257                 name_len = strlen(opts[i].name);
 258                 if (arg_len != name_len ||
 259                     strncmp(arg_str, opts[i].name, name_len))
 260                         continue;
 261
 262                 switch (opts[i].mask) {
 263                 case COL_ENABLE_MASK:
 264                         *group_set |= ENABLE_SET;
 265                         break;
 266                 case COL_LAYOUT_MASK:
 267                         *group_set |= LAYOUT_SET;
 268                         break;
 269                 }
 270
 271                 if (opts[i].mask)
 272                         *colopts = (*colopts & ~opts[i].mask) | opts[i].value;
 273                 else {
 274                         if (set)
 275                                 *colopts |= opts[i].value;
 276                         else
 277                                 *colopts &= ~opts[i].value;
 278                 }
 279                 return 0;
 280         }
 281
 282         return error("unsupported option '%s'", arg);
 283 }
 284
 285 static int parse_config(unsigned int *colopts, const char *value)
 286 {
 287         const char *sep = " ,";
 288         int group_set = 0;
 289
 290         while (*value) {
 291                 int len = strcspn(value, sep);
 292                 if (len) {
 293                         if (parse_option(value, len, colopts, &group_set))
 294                                 return -1;
 295
 296                         value += len;
 297                 }
 298                 value += strspn(value, sep);
 299         }
 300         /*
 301          * If none of "always", "never", and "auto" is specified, then setting
 302          * layout implies "always".
 303          *
 304          * Current value in COL_ENABLE_MASK is disregarded. This means if
 305          * you set column.ui = auto and pass --column=row, then "auto"
 306          * will become "always".
 307          */
 308         if ((group_set & LAYOUT_SET) && !(group_set & ENABLE_SET))
 309                 *colopts = (*colopts & ~COL_ENABLE_MASK) | COL_ENABLED;
 310         return 0;
 311 }
 312
 313 static int column_config(const char *var, const char *value,
 314                          const char *key, unsigned int *colopts)
 315 {
 316         if (!value)
 317                 return config_error_nonbool(var);
 318         if (parse_config(colopts, value))
 319                 return error("invalid column.%s mode %s", key, value);
 320         return 0;
 321 }
 322
 323 int git_column_config(const char *var, const char *value,
 324                       const char *command, unsigned int *colopts)
 325 {
 326         const char *it;
 327
 328         if (!skip_prefix(var, "column.", &it))
 329                 return 0;
 330
 331         if (!strcmp(it, "ui"))
 332                 return column_config(var, value, "ui", colopts);
 333
 334         if (command && !strcmp(it, command))
 335                 return column_config(var, value, it, colopts);
 336
 337         return 0;
 338 }
 339
 340 int parseopt_column_callback(const struct option *opt,
 341                              const char *arg, int unset)
 342 {
 343         unsigned int *colopts = opt->value;
 344         *colopts |= COL_PARSEOPT;
 345         *colopts &= ~COL_ENABLE_MASK;
 346         if (unset)              /* --no-column == never */
 347                 return 0;
 348         /* --column == always unless "arg" states otherwise */
 349         *colopts |= COL_ENABLED;
 350         if (arg)
 351                 return parse_config(colopts, arg);
 352
 353         return 0;
 354 }
 355
 356 static int fd_out = -1;
 357 static struct child_process column_process = CHILD_PROCESS_INIT;
 358
 359 int run_column_filter(int colopts, const struct column_options *opts)
 360 {
 361         struct strvec *argv;
 362
 363         if (fd_out != -1)
 364                 return -1;
 365
 366         child_process_init(&column_process);
 367         argv = &column_process.args;
 368
 369         strvec_push(argv, "column");
 370         strvec_pushf(argv, "--raw-mode=%d", colopts);
 371         if (opts && opts->width)
 372                 strvec_pushf(argv, "--width=%d", opts->width);
 373         if (opts && opts->indent)
 374                 strvec_pushf(argv, "--indent=%s", opts->indent);
 375         if (opts && opts->padding)
 376                 strvec_pushf(argv, "--padding=%d", opts->padding);
 377
 378         fflush(stdout);
 379         column_process.in = -1;
 380         column_process.out = dup(1);
 381         column_process.git_cmd = 1;
 382
 383         if (start_command(&column_process))
 384                 return -2;
 385
 386         fd_out = dup(1);
 387         close(1);
 388         dup2(column_process.in, 1);
 389         close(column_process.in);
 390         return 0;
 391 }
 392
 393 int stop_column_filter(void)
 394 {
 395         if (fd_out == -1)
 396                 return -1;
 397
 398         fflush(stdout);
 399         close(1);
 400         finish_command(&column_process);
 401         dup2(fd_out, 1);
 402         close(fd_out);
 403         fd_out = -1;
 404         return 0;
 405 }