libsmartcols: cleanup and extend padding functionality

LIBSMARTCOLS_DEBUG_PADDING=on in the next examples forces libsmartcols
print '.' as a padding char. See line "ffff" in the exmaples.

* default output is to fill all except last cell

	$ LIBSMARTCOLS_DEBUG_PADDING=on ./sample-scols-fromfile --nlines 10  --width 80 --column tests/ts/libsmartcols/files/col-name --column tests/ts/libsmartcols/files/col-number --column tests/ts/libsmartcols/files/col-string --column tests/ts/libsmartcols/files/col-string tests/ts/libsmartcols/files/data-string tests/ts/libsmartcols/files/data-number tests/ts/libsmartcols/files/data-string-empty tests/ts/libsmartcols/files/data-string-empty 2> /dev/null
	NAME.. ......NUM STRINGS STRINGS
	aaaa.. ........0 aaaa... aaaa
	bbb... ......100 bbb.... bbb
	ccccc. .......21 ccccc.. ccccc
	dddddd ........3 dddddd. dddddd
	ee.... ......411 ee..... ee
	ffff.. .....5111 .......
	gggggg 678993321 gggggg. gggggg
	hhh... ..7666666 hhh.... hhh

* scols_table_enable_minout() minimizes output for tailing empty cells, example:

	$ LIBSMARTCOLS_DEBUG_PADDING=on ./sample-scols-fromfile --nlines 10 --minout  --width 80 --column tests/ts/libsmartcols/files/col-name --column tests/ts/libsmartcols/files/col-number --column tests/ts/libsmartcols/files/col-string --column tests/ts/libsmartcols/files/col-string tests/ts/libsmartcols/files/data-string tests/ts/libsmartcols/files/data-number tests/ts/libsmartcols/files/data-string-empty tests/ts/libsmartcols/files/data-string-empty 2> /dev/null
	NAME.. ......NUM STRINGS STRINGS
	aaaa.. ........0 aaaa... aaaa
	bbb... ......100 bbb.... bbb
	ccccc. .......21 ccccc.. ccccc
	dddddd ........3 dddddd. dddddd
	ee.... ......411 ee..... ee
	ffff.. .....5111
	gggggg 678993321 gggggg. gggggg
	hhh... ..7666666 hhh.... hhh

* cleanup up scols_table_enable_maxout() use, example:

	$ LIBSMARTCOLS_DEBUG_PADDING=on ./sample-scols-fromfile --nlines 10 --maxout  --width 80 --column tests/ts/libsmartcols/files/col-name --column tests/ts/libsmartcols/files/col-number --column tests/ts/libsmartcols/files/col-string --column tests/ts/libsmartcols/files/col-string tests/ts/libsmartcols/files/data-string tests/ts/libsmartcols/files/data-number tests/ts/libsmartcols/files/data-string-empty tests/ts/libsmartcols/files/data-string-empty 2> /dev/null
	NAME.............. ..................NUM STRINGS............ STRINGS............
	aaaa.............. ....................0 aaaa............... aaaa...............
	bbb............... ..................100 bbb................ bbb................
	ccccc............. ...................21 ccccc.............. ccccc..............
	dddddd............ ....................3 dddddd............. dddddd.............
	ee................ ..................411 ee................. ee.................
	ffff.............. .................5111 ................... ...................
	gggggg............ ............678993321 gggggg............. gggggg.............
	hhh............... ..............7666666 hhh................ hhh................

Note that we cannot make scols_table_enable_minout() default because
for example "column --table" is pretty commonly used with non-blank
columns separator and in this case all cells has to be filled.

	$ echo -e "aa,b,ccc\na,,\naaa,bbb,ccc" |  column --table --separator ',' --output-separator '|'
	aa |b  |ccc
	a  |   |
	aaa|bbb|ccc

Addresses: https://github.com/karelzak/util-linux/issues/826
Signed-off-by: Karel Zak <kzak@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/libsmartcols/src/libsmartcols.h.in b/libsmartcols/src/libsmartcols.h.in
index bd47f7898..d4be9969a 100644
--- a/libsmartcols/src/libsmartcols.h.in
+++ b/libsmartcols/src/libsmartcols.h.in
@@ -243,6 +243,7 @@ extern int scols_table_is_header_repeat(const struct libscols_table *tb);
 extern int scols_table_is_empty(const struct libscols_table *tb);
 extern int scols_table_is_export(const struct libscols_table *tb);
 extern int scols_table_is_maxout(const struct libscols_table *tb);
+extern int scols_table_is_minout(const struct libscols_table *tb);
 extern int scols_table_is_nowrap(const struct libscols_table *tb);
 extern int scols_table_is_nolinesep(const struct libscols_table *tb);
 extern int scols_table_is_tree(const struct libscols_table *tb);
@@ -256,6 +257,7 @@ extern int scols_table_enable_noheadings(struct libscols_table *tb, int enable);
 extern int scols_table_enable_header_repeat(struct libscols_table *tb, int enable);
 extern int scols_table_enable_export(struct libscols_table *tb, int enable);
 extern int scols_table_enable_maxout(struct libscols_table *tb, int enable);
+extern int scols_table_enable_minout(struct libscols_table *tb, int enable);
 extern int scols_table_enable_nowrap(struct libscols_table *tb, int enable);
 extern int scols_table_enable_nolinesep(struct libscols_table *tb, int enable);
 extern int scols_table_enable_noencoding(struct libscols_table *tb, int enable);
@@ -272,6 +274,7 @@ extern int scols_table_remove_columns(struct libscols_table *tb);
 extern int scols_table_move_column(struct libscols_table *tb, struct libscols_column *pre, struct libscols_column *cl);
 extern struct libscols_column *scols_table_new_column(struct libscols_table *tb, const char *name, double whint, int flags);
 extern int scols_table_next_column(struct libscols_table *tb, struct libscols_iter *itr, struct libscols_column **cl);
+extern int scols_table_set_columns_iter(struct libscols_table *tb, struct libscols_iter *itr, struct libscols_column *cl);
 extern const char *scols_table_get_column_separator(const struct libscols_table *tb);
 extern const char *scols_table_get_line_separator(const struct libscols_table *tb);
 extern size_t scols_table_get_ncols(const struct libscols_table *tb);