Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
column.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++
column.h | 2 +
t/t9002-column.sh | 22 ++++++++++++++
3 files changed, 104 insertions(+), 0 deletions(-)
diff --git a/column.c b/column.c
index be4e07c..fcff2fd 100644
--- a/column.c
+++ b/column.c
@@ -19,6 +19,7 @@ struct column_data {
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 */
@@ -63,6 +64,69 @@ static void layout(struct column_data *data, int *width)
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)
+ continue;
+ if (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)
+{
+ int x, y, total_width, cols, rows;
+
+ data->width = xrealloc(data->width,
+ sizeof(*data->width) * data->cols);
+ for (x = 0; x < data->cols; x++) {
+ data->width[x] = 0;
+ for (y = 0; y < data->rows; y++) {
+ int len1 = data->len[data->width[x]];
+ int len2 = data->len[XY2LINEAR(data, x, y)];
+ if (len1 < len2)
+ data->width[x] = y;
+ }
+ }
+
+ while (data->rows > 1) {
+ 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->indent);
+ for (x = 0; x < data->cols; x++) {
+ total_width += data->len[data->width[x]];
+ total_width += data->padding;
+ }
+ if (total_width > data->total_width) {
+ data->rows = rows;
+ data->cols = cols;
+ compute_column_width(data);
+ break;
+ }
+ }
+}
+
/* Display without layout when COL_ENABLED is not set */
static void display_plain(const struct string_list *list,
const char *indent, const char *nl)
@@ -82,7 +146,18 @@ static int display_cell(struct column_data *data, int initial_width,
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->padding;
+ }
+
if (MODE(data->mode) == COL_MODE_COLUMN)
newline = i + data->rows >= data->list->nr;
else
@@ -119,6 +194,9 @@ static void display_table(const struct string_list *list,
layout(&data, &initial_width);
+ if (mode & COL_DENSE)
+ shrink_columns(&data);
+
empty_cell = xmalloc(initial_width + 1);
memset(empty_cell, ' ', initial_width);
empty_cell[initial_width] = '\0';
@@ -129,6 +207,7 @@ static void display_table(const struct string_list *list,
}
free(data.len);
+ free(data.width);
free(empty_cell);
}
@@ -227,6 +306,7 @@ static int parse_option(const char *arg, int len,
{ MODE, "column", COL_MODE_COLUMN },
{ MODE, "row", COL_MODE_ROW },
{ OPTION, "color", COL_ANSI },
+ { OPTION, "dense", COL_DENSE },
};
int i, set, name_len;
diff --git a/column.h b/column.h
index 52181d4..2255851 100644
--- a/column.h
+++ b/column.h
@@ -7,6 +7,8 @@
#define COL_ENABLED (1 << 4)
#define COL_ENABLED_SET (1 << 5) /* Has COL_ENABLED been set by config? */
#define COL_ANSI (1 << 6) /* Remove ANSI escapes from string length */
+#define COL_DENSE (1 << 7) /* Shrink columns when possible,
+ making space for more columns */
struct column_options {
int width;
diff --git a/t/t9002-column.sh b/t/t9002-column.sh
index cffb029..23d340e 100755
--- a/t/t9002-column.sh
+++ b/t/t9002-column.sh
@@ -71,6 +71,17 @@ EOF
test_cmp expected actual
'
+test_expect_success '20 columns, dense' '
+ cat >expected <<\EOF &&
+one five nine
+two six ten
+three seven eleven
+four eight
+EOF
+ git column --mode=column,dense < lista > actual &&
+ test_cmp expected actual
+'
+
test_expect_success '20 columns, padding 2' '
cat >expected <<\EOF &&
one seven
@@ -110,4 +121,15 @@ EOF
test_cmp expected actual
'
+test_expect_success '20 columns, row first, dense' '
+ cat >expected <<\EOF &&
+one two three
+four five six
+seven eight nine
+ten eleven
+EOF
+ git column --mode=row,dense <lista >actual &&
+ test_cmp expected actual
+'
+
test_done
--
1.7.8.36.g69ee2
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