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-rw-r--r--src/pacman/util.c95
1 files changed, 71 insertions, 24 deletions
diff --git a/src/pacman/util.c b/src/pacman/util.c
index efd8563d..f317223e 100644
--- a/src/pacman/util.c
+++ b/src/pacman/util.c
@@ -487,52 +487,86 @@ void string_display(const char *title, const char *string)
printf("\n");
}
-static void table_print_line(const alpm_list_t *line,
- size_t colcount, size_t *widths)
+static void table_print_line(const alpm_list_t *line, short col_padding,
+ size_t colcount, size_t *widths, int *has_data)
{
- size_t i;
+ size_t i, lastcol = 0;
+ int need_padding = 0;
const alpm_list_t *curcell;
+ for(i = colcount; i > 0; i--) {
+ if(has_data[i - 1]) {
+ lastcol = i - 1;
+ break;
+ }
+ }
+
for(i = 0, curcell = line; curcell && i < colcount;
i++, curcell = alpm_list_next(curcell)) {
- const char *value = curcell->data;
- size_t len = string_length(value);
+ const char *value;
+ int cell_padding;
+
+ if(!has_data[i]) {
+ continue;
+ }
+
+ value = curcell->data;
/* silly printf requires padding size to be an int */
- int padding = (int)widths[i] - (int)len;
- if(padding < 0) {
- padding = 0;
+ cell_padding = (int)widths[i] - (int)string_length(value);
+ if(cell_padding < 0) {
+ cell_padding = 0;
+ }
+ if(need_padding) {
+ printf("%*s", col_padding, "");
}
/* left-align all but the last column */
- if(i + 1 < colcount) {
- printf("%s%*s", value, padding, "");
+ if(i != lastcol) {
+ printf("%s%*s", value, cell_padding, "");
} else {
- printf("%*s%s", padding, "", value);
+ printf("%*s%s", cell_padding, "", value);
}
+ need_padding = 1;
}
printf("\n");
}
-/* find the max string width of each column */
+
+
+/**
+ * Find the max string width of each column. Also determines whether values
+ * exist in the column and sets the value in has_data accordingly.
+ * @param header a list of header strings
+ * @param rows a list of lists of rows as strings
+ * @param padding the amount of padding between columns
+ * @param totalcols the total number of columns in the header and each row
+ * @param widths a pointer to store width data
+ * @param has_data a pointer to store whether column has data
+ *
+ * @return the total width of the table; 0 on failure
+ */
static size_t table_calc_widths(const alpm_list_t *header,
- const alpm_list_t *rows, size_t totalcols, size_t **widths)
+ const alpm_list_t *rows, short padding, size_t totalcols,
+ size_t **widths, int **has_data)
{
const alpm_list_t *i;
- const unsigned short padding = 2;
- size_t curcol, totalwidth = 0;
+ size_t curcol, totalwidth = 0, usefulcols = 0;
size_t *colwidths;
+ int *coldata;
if(totalcols <= 0) {
return 0;
}
colwidths = malloc(totalcols * sizeof(size_t));
- if(!colwidths) {
+ coldata = calloc(totalcols, sizeof(int));
+ if(!colwidths || !coldata) {
return 0;
}
/* header determines column count and initial values of longest_strs */
for(i = header, curcol = 0; i; i = alpm_list_next(i), curcol++) {
colwidths[curcol] = string_length(i->data);
+ /* note: header does not determine whether column has data */
}
/* now find the longest string in each column */
@@ -546,18 +580,27 @@ static size_t table_calc_widths(const alpm_list_t *header,
if(str_len > colwidths[curcol]) {
colwidths[curcol] = str_len;
}
+ if(str_len > 0) {
+ coldata[curcol] = 1;
+ }
}
}
for(i = header, curcol = 0; i; i = alpm_list_next(i), curcol++) {
- /* pad everything but the last column */
- if(curcol + 1 < totalcols) {
- colwidths[curcol] += padding;
+ /* only include columns that have data */
+ if(coldata[curcol]) {
+ usefulcols++;
+ totalwidth += colwidths[curcol];
}
- totalwidth += colwidths[curcol];
+ }
+
+ /* add padding between columns */
+ if(usefulcols > 0) {
+ totalwidth += padding * (usefulcols - 1);
}
*widths = colwidths;
+ *has_data = coldata;
return totalwidth;
}
@@ -574,21 +617,24 @@ static size_t table_calc_widths(const alpm_list_t *header,
int table_display(const char *title, const alpm_list_t *header,
const alpm_list_t *rows)
{
+ const unsigned short padding = 2;
const alpm_list_t *i;
size_t *widths = NULL, totalcols, totalwidth;
+ int *has_data = NULL;
if(rows == NULL || header == NULL) {
return 0;
}
totalcols = alpm_list_count(header);
- totalwidth = table_calc_widths(header, rows, totalcols, &widths);
+ totalwidth = table_calc_widths(header, rows, padding, totalcols,
+ &widths, &has_data);
/* return -1 if terminal is not wide enough */
if(totalwidth > getcols()) {
fprintf(stderr, _("insufficient columns available for table display\n"));
return -1;
}
- if(!totalwidth || !widths) {
+ if(!totalwidth || !widths || !has_data) {
return -1;
}
@@ -596,14 +642,15 @@ int table_display(const char *title, const alpm_list_t *header,
printf("%s\n\n", title);
}
- table_print_line(header, totalcols, widths);
+ table_print_line(header, padding, totalcols, widths, has_data);
printf("\n");
for(i = rows; i; i = alpm_list_next(i)) {
- table_print_line(i->data, totalcols, widths);
+ table_print_line(i->data, padding, totalcols, widths, has_data);
}
free(widths);
+ free(has_data);
return 0;
}