column.c

   1 #include "git-compat-util.h"
   2 #include "config.h"
   3 #include "column.h"
   4 #include "string-list.h"
   5 #include "pager.h"
   6 #include "parse-options.h"
   7 #include "run-command.h"
   8 #include "utf8.h"
   9
  10 #define XY2LINEAR(d, x, y) (COL_LAYOUT((d)->colopts) == COL_COLUMN ? \
  11                             (x) * (d)->rows + (y) : \
  12                             (y) * (d)->cols + (x))
  13
  14 struct column_data {
  15         const struct string_list *list;
  16         unsigned int colopts;
  17         struct column_options opts;
  18
  19         int rows, cols;
  20         int *len;               /* cell length */
  21         int *width;           /* index to the longest row in column */
  22 };
  23
  24 /* return length of 's' in letters, ANSI escapes stripped */
  25 static int item_length(const char *s)
  26 {
  27         return utf8_strnwidth(s, strlen(s), 1);
  28 }
  29
  30 /*
  31  * Calculate cell width, rows and cols for a table of equal cells, given
  32  * table width and how many spaces between cells.
  33  */
  34 static void layout(struct column_data *data, int *width)
  35 {
  36         int i;
  37
  38         *width = 0;
  39         for (i = 0; i < data->list->nr; i++)
  40                 if (*width < data->len[i])
  41                         *width = data->len[i];
  42
  43         *width += data->opts.padding;
  44
  45         data->cols = (data->opts.width - strlen(data->opts.indent)) / *width;
  46         if (data->cols == 0)
  47                 data->cols = 1;
  48
  49         data->rows = DIV_ROUND_UP(data->list->nr, data->cols);
  50 }
  51
  52 static void compute_column_width(struct column_data *data)
  53 {
  54         int i, x, y;
  55         for (x = 0; x < data->cols; x++) {
  56                 data->width[x] = XY2LINEAR(data, x, 0);
  57                 for (y = 0; y < data->rows; y++) {
  58                         i = XY2LINEAR(data, x, y);
  59                         if (i < data->list->nr &&
  60                             data->len[data->width[x]] < data->len[i])
  61                                 data->width[x] = i;
  62                 }
  63         }
  64 }
  65
  66 /*
  67  * Shrink all columns by shortening them one row each time (and adding
  68  * more columns along the way). Hopefully the longest cell will be
  69  * moved to the next column, column is shrunk so we have more space
  70  * for new columns. The process ends when the whole thing no longer
  71  * fits in data->total_width.
  72  */
  73 static void shrink_columns(struct column_data *data)
  74 {
  75         REALLOC_ARRAY(data->width, data->cols);
  76         while (data->rows > 1) {
  77                 int x, total_width, cols, rows;
  78                 rows = data->rows;
  79                 cols = data->cols;
  80
  81                 data->rows--;
  82                 data->cols = DIV_ROUND_UP(data->list->nr, data->rows);
  83                 if (data->cols != cols)
  84                         REALLOC_ARRAY(data->width, data->cols);
  85                 compute_column_width(data);
  86
  87                 total_width = strlen(data->opts.indent);
  88                 for (x = 0; x < data->cols; x++) {
  89                         total_width += data->len[data->width[x]];
  90                         total_width += data->opts.padding;
  91                 }
  92                 if (total_width > data->opts.width) {
  93                         data->rows = rows;
  94                         data->cols = cols;
  95                         break;
  96                 }
  97         }
  98         compute_column_width(data);
  99 }
 100
 101 /* Display without layout when not enabled */
 102 static void display_plain(const struct string_list *list,
 103                           const char *indent, const char *nl)
 104 {
 105         int i;
 106
 107         for (i = 0; i < list->nr; i++)
 108                 printf("%s%s%s", indent, list->items[i].string, nl);
 109 }
 110
 111 /* Print a cell to stdout with all necessary leading/trailing space */
 112 static int display_cell(struct column_data *data, int initial_width,
 113                         const char *empty_cell, int x, int y)
 114 {
 115         int i, len, newline;
 116
 117         i = XY2LINEAR(data, x, y);
 118         if (i >= data->list->nr)
 119                 return -1;
 120
 121         len = data->len[i];
 122         if (data->width && data->len[data->width[x]] < initial_width) {
 123                 /*
 124                  * empty_cell has initial_width chars, if real column
 125                  * is narrower, increase len a bit so we fill less
 126                  * space.
 127                  */
 128                 len += initial_width - data->len[data->width[x]];
 129                 len -= data->opts.padding;
 130         }
 131
 132         if (COL_LAYOUT(data->colopts) == COL_COLUMN)
 133                 newline = i + data->rows >= data->list->nr;
 134         else
 135                 newline = x == data->cols - 1 || i == data->list->nr - 1;
 136
 137         printf("%s%s%s",
 138                x == 0 ? data->opts.indent : "",
 139                data->list->items[i].string,
 140                newline ? data->opts.nl : empty_cell + len);
 141         return 0;
 142 }
 143
 144 /* Display COL_COLUMN or COL_ROW */
 145 static void display_table(const struct string_list *list,
 146                           unsigned int colopts,
 147                           const struct column_options *opts)
 148 {
 149         struct column_data data;
 150         int x, y, i, initial_width;
 151         char *empty_cell;
 152
 153         memset(&data, 0, sizeof(data));
 154         data.list = list;
 155         data.colopts = colopts;
 156         data.opts = *opts;
 157
 158         ALLOC_ARRAY(data.len, list->nr);
 159         for (i = 0; i < list->nr; i++)
 160                 data.len[i] = item_length(list->items[i].string);
 161
 162         layout(&data, &initial_width);
 163
 164         if (colopts & COL_DENSE)
 165                 shrink_columns(&data);
 166
 167         empty_cell = xmallocz(initial_width);
 168         memset(empty_cell, ' ', initial_width);
 169         for (y = 0; y < data.rows; y++) {
 170                 for (x = 0; x < data.cols; x++)
 171                         if (display_cell(&data, initial_width, empty_cell, x, y))
 172                                 break;
 173         }
 174
 175         free(data.len);
 176         free(data.width);
 177         free(empty_cell);
 178 }
 179
 180 void print_columns(const struct string_list *list, unsigned int colopts,
 181                    const struct column_options *opts)
 182 {
 183         struct column_options nopts;
 184
 185         if (!list->nr)
 186                 return;
 187         assert((colopts & COL_ENABLE_MASK) != COL_AUTO);
 188
 189         memset(&nopts, 0, sizeof(nopts));
 190         nopts.indent = opts && opts->indent ? opts->indent : "";
 191         nopts.nl = opts && opts->nl ? opts->nl : "\n";
 192         nopts.padding = opts ? opts->padding : 1;
 193         nopts.width = opts && opts->width ? opts->width : term_columns() - 1;
 194         if (!column_active(colopts)) {
 195                 display_plain(list, "", "\n");
 196                 return;
 197         }
 198         switch (COL_LAYOUT(colopts)) {
 199         case COL_PLAIN:
 200                 display_plain(list, nopts.indent, nopts.nl);
 201                 break;
 202         case COL_ROW:
 203         case COL_COLUMN:
 204                 display_table(list, colopts, &nopts);
 205                 break;
 206         default:
 207                 BUG("invalid layout mode %d", COL_LAYOUT(colopts));
 208         }
 209 }
 210
 211 int finalize_colopts(unsigned int *colopts, int stdout_is_tty)
 212 {
 213         if ((*colopts & COL_ENABLE_MASK) == COL_AUTO) {
 214                 if (stdout_is_tty < 0)
 215                         stdout_is_tty = isatty(1);
 216                 *colopts &= ~COL_ENABLE_MASK;
 217                 if (stdout_is_tty || pager_in_use())
 218                         *colopts |= COL_ENABLED;
 219         }
 220         return 0;
 221 }
 222
 223 struct colopt {
 224         const char *name;
 225         unsigned int value;
 226         unsigned int mask;
 227 };
 228
 229 #define LAYOUT_SET 1
 230 #define ENABLE_SET 2
 231
 232 static int parse_option(const char *arg, int len, unsigned int *colopts,
 233                         int *group_set)
 234 {
 235         struct colopt opts[] = {
 236                 { "always", COL_ENABLED,  COL_ENABLE_MASK },
 237                 { "never",  COL_DISABLED, COL_ENABLE_MASK },
 238                 { "auto",   COL_AUTO,     COL_ENABLE_MASK },
 239                 { "plain",  COL_PLAIN,    COL_LAYOUT_MASK },
 240                 { "column", COL_COLUMN,   COL_LAYOUT_MASK },
 241                 { "row",    COL_ROW,      COL_LAYOUT_MASK },
 242                 { "dense",  COL_DENSE,    0 },
 243         };
 244         int i;
 245
 246         for (i = 0; i < ARRAY_SIZE(opts); i++) {
 247                 int set = 1, arg_len = len, name_len;
 248                 const char *arg_str = arg;
 249
 250                 if (!opts[i].mask) {
 251                         if (arg_len > 2 && !strncmp(arg_str, "no", 2)) {
 252                                 arg_str += 2;
 253                                 arg_len -= 2;
 254                                 set = 0;
 255                         }
 256                 }
 257
 258                 name_len = strlen(opts[i].name);
 259                 if (arg_len != name_len ||
 260                     strncmp(arg_str, opts[i].name, name_len))
 261                         continue;
 262
 263                 switch (opts[i].mask) {
 264                 case COL_ENABLE_MASK:
 265                         *group_set |= ENABLE_SET;
 266                         break;
 267                 case COL_LAYOUT_MASK:
 268                         *group_set |= LAYOUT_SET;
 269                         break;
 270                 }
 271
 272                 if (opts[i].mask)
 273                         *colopts = (*colopts & ~opts[i].mask) | opts[i].value;
 274                 else {
 275                         if (set)
 276                                 *colopts |= opts[i].value;
 277                         else
 278                                 *colopts &= ~opts[i].value;
 279                 }
 280                 return 0;
 281         }
 282
 283         return error("unsupported option '%s'", arg);
 284 }
 285
 286 static int parse_config(unsigned int *colopts, const char *value)
 287 {
 288         const char *sep = " ,";
 289         int group_set = 0;
 290
 291         while (*value) {
 292                 int len = strcspn(value, sep);
 293                 if (len) {
 294                         if (parse_option(value, len, colopts, &group_set))
 295                                 return -1;
 296
 297                         value += len;
 298                 }
 299                 value += strspn(value, sep);
 300         }
 301         /*
 302          * If none of "always", "never", and "auto" is specified, then setting
 303          * layout implies "always".
 304          *
 305          * Current value in COL_ENABLE_MASK is disregarded. This means if
 306          * you set column.ui = auto and pass --column=row, then "auto"
 307          * will become "always".
 308          */
 309         if ((group_set & LAYOUT_SET) && !(group_set & ENABLE_SET))
 310                 *colopts = (*colopts & ~COL_ENABLE_MASK) | COL_ENABLED;
 311         return 0;
 312 }
 313
 314 static int column_config(const char *var, const char *value,
 315                          const char *key, unsigned int *colopts)
 316 {
 317         if (!value)
 318                 return config_error_nonbool(var);
 319         if (parse_config(colopts, value))
 320                 return error("invalid column.%s mode %s", key, value);
 321         return 0;
 322 }
 323
 324 int git_column_config(const char *var, const char *value,
 325                       const char *command, unsigned int *colopts)
 326 {
 327         const char *it;
 328
 329         if (!skip_prefix(var, "column.", &it))
 330                 return 0;
 331
 332         if (!strcmp(it, "ui"))
 333                 return column_config(var, value, "ui", colopts);
 334
 335         if (command && !strcmp(it, command))
 336                 return column_config(var, value, it, colopts);
 337
 338         return 0;
 339 }
 340
 341 int parseopt_column_callback(const struct option *opt,
 342                              const char *arg, int unset)
 343 {
 344         unsigned int *colopts = opt->value;
 345         *colopts |= COL_PARSEOPT;
 346         *colopts &= ~COL_ENABLE_MASK;
 347         if (unset)              /* --no-column == never */
 348                 return 0;
 349         /* --column == always unless "arg" states otherwise */
 350         *colopts |= COL_ENABLED;
 351         if (arg)
 352                 return parse_config(colopts, arg);
 353
 354         return 0;
 355 }
 356
 357 static int fd_out = -1;
 358 static struct child_process column_process = CHILD_PROCESS_INIT;
 359
 360 int run_column_filter(int colopts, const struct column_options *opts)
 361 {
 362         struct strvec *argv;
 363
 364         if (fd_out != -1)
 365                 return -1;
 366
 367         child_process_init(&column_process);
 368         argv = &column_process.args;
 369
 370         strvec_push(argv, "column");
 371         strvec_pushf(argv, "--raw-mode=%d", colopts);
 372         if (opts && opts->width)
 373                 strvec_pushf(argv, "--width=%d", opts->width);
 374         if (opts && opts->indent)
 375                 strvec_pushf(argv, "--indent=%s", opts->indent);
 376         if (opts && opts->padding)
 377                 strvec_pushf(argv, "--padding=%d", opts->padding);
 378
 379         fflush(stdout);
 380         column_process.in = -1;
 381         column_process.out = dup(1);
 382         column_process.git_cmd = 1;
 383
 384         if (start_command(&column_process))
 385                 return -2;
 386
 387         fd_out = dup(1);
 388         close(1);
 389         dup2(column_process.in, 1);
 390         close(column_process.in);
 391         return 0;
 392 }
 393
 394 int stop_column_filter(void)
 395 {
 396         if (fd_out == -1)
 397                 return -1;
 398
 399         fflush(stdout);
 400         close(1);
 401         finish_command(&column_process);
 402         dup2(fd_out, 1);
 403         close(fd_out);
 404         fd_out = -1;
 405         return 0;
 406 }