sidebar: a status can have more than one row (tab_bar_status_lines)

Sixteen cells is not enough for a sentence, and a sentence is what a pane
has to say: "add a summary…" is most of a status and none of its meaning.
tab_bar_status_lines 3 word-wraps instead of cutting, and the same column
carries forty-eight cells rather than sixteen.

Wrapped, the rows under a tab stop being a list of panes and become a
paragraph each, so the shape no longer says where one pane's status ends and
the next begins -- both are italic text down one column. Alternate panes are
drawn on alternate bands to say it instead: tab_status_stripe, derived from
the theme like tab_status_fg, so a theme that has never heard of any of this
still gets a band in its own family. Nothing is painted at one line, where
there is no ambiguity to resolve and a band would take a translucent
terminal's background away for nothing.

1 is the default and is the old behaviour exactly, down to cutting at the
column rather than the last word before it: with no next row to move the word
to, breaking early would spend cells on nothing. The reason to prefer a word
boundary only exists once there is somewhere for the word to go.

Rows count against tab_bar_status as before, so wrapping trades panes for
words within the same allowance, and the allowance itself still gives way to
the tabs. A status that will not fit whole is dropped whole and reported with
the ellipsis, rather than shown as a fragment that reads like the whole
thing. Every row of a status is the same `find:` door.

tabstatus's buffer goes to 256 to match pane_status's own slot: at one line
the drawing cut it anyway, but wrapped it is the whole string that has to
survive the trip.

2 files changed, 20 insertions, 0 deletions

diff --git a/include/app_internal.h b/include/app_internal.h
index 94a92cf..97f6028 100644
--- a/include/app_internal.h
+++ b/include/app_internal.h
@@ -394,6 +394,7 @@ extern config_t CFG;
 #define TAB_COUNT (CFG.tab_count)
 #define TAB_STATUS_FG (CFG.tab_status_fg)
 #define TAB_STATUS_BG (CFG.tab_status_bg)
+#define TAB_STATUS_STRIPE (CFG.tab_status_stripe)
 #define STATUS_C (CFG.status)
 #define STATUS_STATE (CFG.status_state)
 #define FINDER_FG (CFG.finder_fg)
diff --git a/include/config.h b/include/config.h
index 0f9d37e..d0aeccd 100644
--- a/include/config.h
+++ b/include/config.h
@@ -345,6 +345,17 @@ typedef struct {
    * at all -- the top strip has one row and no room to say any of it. 0 turns
    * it off. */
   uint16_t tab_bar_status;
+  /* How many rows one pane's status may wrap onto, rather than being cut at
+   * the sidebar's width. 1 is the old behaviour and the default: a status is
+   * one row, truncated with an ellipsis.
+   *
+   * Above 1 it is word-wrapped, which buys a narrow sidebar a great deal --
+   * three rows of sixteen cells is forty-eight, and the difference between
+   * "add a summary\u2026" and the whole sentence. The cost is that the rows
+   * under a tab stop being a list of panes and become a paragraph per pane,
+   * so the stripe below is what keeps one pane's status apart from the next
+   * one's. Counts against tab_bar_status the same as any other row. */
+  uint16_t tab_bar_status_lines;
   /* Frame the sidebar the way panes are framed, so it reads as part of the
    * chrome rather than as text floating beside it. In compact mode its lines
    * are shared with the tab area's outer ring -- the same junction-forming
@@ -457,6 +468,14 @@ typedef struct {
    * none leaves the terminal's own background alone, which is what a
    * translucent one wants. */
   color_t tab_status_fg, tab_status_bg;
+  /* The other stripe. With wrapped statuses, where one pane's rows end and
+   * the next one's begin is no longer obvious from the shape -- both are
+   * just italic text down the same column -- so alternate panes sit on
+   * alternate bands. Unset and derived from the theme, like tab_status_fg,
+   * and only ever drawn when a status can actually wrap: a single-row status
+   * has no ambiguity to resolve, and painting a band behind it would take a
+   * translucent terminal's own background away for nothing. */
+  color_t tab_status_stripe;
 
   /* the line along the bottom */
   color_t status, status_state;