diff options
Diffstat (limited to 'column.c')
| -rw-r--r-- | column.c | 434 |
1 files changed, 434 insertions, 0 deletions
diff --git a/column.c b/column.c new file mode 100644 index 0000000000..9367ba5db5 --- /dev/null +++ b/column.c @@ -0,0 +1,434 @@ +#include "cache.h" +#include "column.h" +#include "string-list.h" +#include "parse-options.h" +#include "run-command.h" +#include "utf8.h" + +#define XY2LINEAR(d, x, y) (COL_LAYOUT((d)->colopts) == COL_COLUMN ? \ + (x) * (d)->rows + (y) : \ + (y) * (d)->cols + (x)) + +struct column_data { + const struct string_list *list; + unsigned int colopts; + struct column_options opts; + + int rows, cols; + int *len; /* cell length */ + int *width; /* index to the longest row in column */ +}; + +/* return length of 's' in letters, ANSI escapes stripped */ +static int item_length(unsigned int colopts, const char *s) +{ + int len, i = 0; + struct strbuf str = STRBUF_INIT; + + strbuf_addstr(&str, s); + while ((s = strstr(str.buf + i, "\033[")) != NULL) { + int len = strspn(s + 2, "0123456789;"); + i = s - str.buf; + strbuf_remove(&str, i, len + 3); /* \033[<len><func char> */ + } + len = utf8_strwidth(str.buf); + strbuf_release(&str); + return len; +} + +/* + * Calculate cell width, rows and cols for a table of equal cells, given + * table width and how many spaces between cells. + */ +static void layout(struct column_data *data, int *width) +{ + int i; + + *width = 0; + for (i = 0; i < data->list->nr; i++) + if (*width < data->len[i]) + *width = data->len[i]; + + *width += data->opts.padding; + + data->cols = (data->opts.width - strlen(data->opts.indent)) / *width; + if (data->cols == 0) + data->cols = 1; + + data->rows = DIV_ROUND_UP(data->list->nr, data->cols); +} + +static void compute_column_width(struct column_data *data) +{ + int i, x, y; + for (x = 0; x < data->cols; x++) { + data->width[x] = XY2LINEAR(data, x, 0); + for (y = 0; y < data->rows; y++) { + i = XY2LINEAR(data, x, y); + if (i < data->list->nr && + data->len[data->width[x]] < data->len[i]) + data->width[x] = i; + } + } +} + +/* + * Shrink all columns by shortening them one row each time (and adding + * more columns along the way). Hopefully the longest cell will be + * moved to the next column, column is shrunk so we have more space + * for new columns. The process ends when the whole thing no longer + * fits in data->total_width. + */ +static void shrink_columns(struct column_data *data) +{ + data->width = xrealloc(data->width, + sizeof(*data->width) * data->cols); + while (data->rows > 1) { + int x, total_width, cols, rows; + rows = data->rows; + cols = data->cols; + + data->rows--; + data->cols = DIV_ROUND_UP(data->list->nr, data->rows); + if (data->cols != cols) + data->width = xrealloc(data->width, + sizeof(*data->width) * data->cols); + compute_column_width(data); + + total_width = strlen(data->opts.indent); + for (x = 0; x < data->cols; x++) { + total_width += data->len[data->width[x]]; + total_width += data->opts.padding; + } + if (total_width > data->opts.width) { + data->rows = rows; + data->cols = cols; + break; + } + } + compute_column_width(data); +} + +/* Display without layout when not enabled */ +static void display_plain(const struct string_list *list, + const char *indent, const char *nl) +{ + int i; + + for (i = 0; i < list->nr; i++) + printf("%s%s%s", indent, list->items[i].string, nl); +} + +/* Print a cell to stdout with all necessary leading/traling space */ +static int display_cell(struct column_data *data, int initial_width, + const char *empty_cell, int x, int y) +{ + int i, len, newline; + + i = XY2LINEAR(data, x, y); + if (i >= data->list->nr) + return -1; + + len = data->len[i]; + if (data->width && data->len[data->width[x]] < initial_width) { + /* + * empty_cell has initial_width chars, if real column + * is narrower, increase len a bit so we fill less + * space. + */ + len += initial_width - data->len[data->width[x]]; + len -= data->opts.padding; + } + + if (COL_LAYOUT(data->colopts) == COL_COLUMN) + newline = i + data->rows >= data->list->nr; + else + newline = x == data->cols - 1 || i == data->list->nr - 1; + + printf("%s%s%s", + x == 0 ? data->opts.indent : "", + data->list->items[i].string, + newline ? data->opts.nl : empty_cell + len); + return 0; +} + +/* Display COL_COLUMN or COL_ROW */ +static void display_table(const struct string_list *list, + unsigned int colopts, + const struct column_options *opts) +{ + struct column_data data; + int x, y, i, initial_width; + char *empty_cell; + + memset(&data, 0, sizeof(data)); + data.list = list; + data.colopts = colopts; + data.opts = *opts; + + data.len = xmalloc(sizeof(*data.len) * list->nr); + for (i = 0; i < list->nr; i++) + data.len[i] = item_length(colopts, list->items[i].string); + + layout(&data, &initial_width); + + if (colopts & COL_DENSE) + shrink_columns(&data); + + empty_cell = xmalloc(initial_width + 1); + memset(empty_cell, ' ', initial_width); + empty_cell[initial_width] = '\0'; + for (y = 0; y < data.rows; y++) { + for (x = 0; x < data.cols; x++) + if (display_cell(&data, initial_width, empty_cell, x, y)) + break; + } + + free(data.len); + free(data.width); + free(empty_cell); +} + +void print_columns(const struct string_list *list, unsigned int colopts, + const struct column_options *opts) +{ + struct column_options nopts; + + if (!list->nr) + return; + assert((colopts & COL_ENABLE_MASK) != COL_AUTO); + + memset(&nopts, 0, sizeof(nopts)); + nopts.indent = opts && opts->indent ? opts->indent : ""; + nopts.nl = opts && opts->nl ? opts->nl : "\n"; + nopts.padding = opts ? opts->padding : 1; + nopts.width = opts && opts->width ? opts->width : term_columns() - 1; + if (!column_active(colopts)) { + display_plain(list, "", "\n"); + return; + } + switch (COL_LAYOUT(colopts)) { + case COL_PLAIN: + display_plain(list, nopts.indent, nopts.nl); + break; + case COL_ROW: + case COL_COLUMN: + display_table(list, colopts, &nopts); + break; + default: + die("BUG: invalid layout mode %d", COL_LAYOUT(colopts)); + } +} + +int finalize_colopts(unsigned int *colopts, int stdout_is_tty) +{ + if ((*colopts & COL_ENABLE_MASK) == COL_AUTO) { + if (stdout_is_tty < 0) + stdout_is_tty = isatty(1); + *colopts &= ~COL_ENABLE_MASK; + if (stdout_is_tty) + *colopts |= COL_ENABLED; + } + return 0; +} + +struct colopt { + const char *name; + unsigned int value; + unsigned int mask; +}; + +#define LAYOUT_SET 1 +#define ENABLE_SET 2 + +static int parse_option(const char *arg, int len, unsigned int *colopts, + int *group_set) +{ + struct colopt opts[] = { + { "always", COL_ENABLED, COL_ENABLE_MASK }, + { "never", COL_DISABLED, COL_ENABLE_MASK }, + { "auto", COL_AUTO, COL_ENABLE_MASK }, + { "plain", COL_PLAIN, COL_LAYOUT_MASK }, + { "column", COL_COLUMN, COL_LAYOUT_MASK }, + { "row", COL_ROW, COL_LAYOUT_MASK }, + { "dense", COL_DENSE, 0 }, + }; + int i; + + for (i = 0; i < ARRAY_SIZE(opts); i++) { + int set = 1, arg_len = len, name_len; + const char *arg_str = arg; + + if (!opts[i].mask) { + if (arg_len > 2 && !strncmp(arg_str, "no", 2)) { + arg_str += 2; + arg_len -= 2; + set = 0; + } + } + + name_len = strlen(opts[i].name); + if (arg_len != name_len || + strncmp(arg_str, opts[i].name, name_len)) + continue; + + switch (opts[i].mask) { + case COL_ENABLE_MASK: + *group_set |= ENABLE_SET; + break; + case COL_LAYOUT_MASK: + *group_set |= LAYOUT_SET; + break; + } + + if (opts[i].mask) + *colopts = (*colopts & ~opts[i].mask) | opts[i].value; + else { + if (set) + *colopts |= opts[i].value; + else + *colopts &= ~opts[i].value; + } + return 0; + } + + return error("unsupported option '%s'", arg); +} + +static int parse_config(unsigned int *colopts, const char *value) +{ + const char *sep = " ,"; + int group_set = 0; + + while (*value) { + int len = strcspn(value, sep); + if (len) { + if (parse_option(value, len, colopts, &group_set)) + return -1; + + value += len; + } + value += strspn(value, sep); + } + /* + * Setting layout implies "always" if neither always, never + * nor auto is specified. + * + * Current value in COL_ENABLE_MASK is disregarded. This means if + * you set column.ui = auto and pass --column=row, then "auto" + * will become "always". + */ + if ((group_set & LAYOUT_SET) && !(group_set & ENABLE_SET)) + *colopts = (*colopts & ~COL_ENABLE_MASK) | COL_ENABLED; + return 0; +} + +static int column_config(const char *var, const char *value, + const char *key, unsigned int *colopts) +{ + if (!value) + return config_error_nonbool(var); + if (parse_config(colopts, value)) + return error("invalid column.%s mode %s", key, value); + return 0; +} + +int git_column_config(const char *var, const char *value, + const char *command, unsigned int *colopts) +{ + const char *it = skip_prefix(var, "column."); + if (!it) + return 0; + + if (!strcmp(it, "ui")) + return column_config(var, value, "ui", colopts); + + if (command && !strcmp(it, command)) + return column_config(var, value, it, colopts); + + return 0; +} + +int parseopt_column_callback(const struct option *opt, + const char *arg, int unset) +{ + unsigned int *colopts = opt->value; + *colopts |= COL_PARSEOPT; + *colopts &= ~COL_ENABLE_MASK; + if (unset) /* --no-column == never */ + return 0; + /* --column == always unless "arg" states otherwise */ + *colopts |= COL_ENABLED; + if (arg) + return parse_config(colopts, arg); + + return 0; +} + +static int fd_out = -1; +static struct child_process column_process; + +int run_column_filter(int colopts, const struct column_options *opts) +{ + const char *av[10]; + int ret, ac = 0; + struct strbuf sb_colopt = STRBUF_INIT; + struct strbuf sb_width = STRBUF_INIT; + struct strbuf sb_padding = STRBUF_INIT; + + if (fd_out != -1) + return -1; + + av[ac++] = "column"; + strbuf_addf(&sb_colopt, "--raw-mode=%d", colopts); + av[ac++] = sb_colopt.buf; + if (opts && opts->width) { + strbuf_addf(&sb_width, "--width=%d", opts->width); + av[ac++] = sb_width.buf; + } + if (opts && opts->indent) { + av[ac++] = "--indent"; + av[ac++] = opts->indent; + } + if (opts && opts->padding) { + strbuf_addf(&sb_padding, "--padding=%d", opts->padding); + av[ac++] = sb_padding.buf; + } + av[ac] = NULL; + + fflush(stdout); + memset(&column_process, 0, sizeof(column_process)); + column_process.in = -1; + column_process.out = dup(1); + column_process.git_cmd = 1; + column_process.argv = av; + + ret = start_command(&column_process); + + strbuf_release(&sb_colopt); + strbuf_release(&sb_width); + strbuf_release(&sb_padding); + + if (ret) + return -2; + + fd_out = dup(1); + close(1); + dup2(column_process.in, 1); + close(column_process.in); + return 0; +} + +int stop_column_filter(void) +{ + if (fd_out == -1) + return -1; + + fflush(stdout); + close(1); + finish_command(&column_process); + dup2(fd_out, 1); + close(fd_out); + fd_out = -1; + return 0; +} |