detect rectangular edit support, display in notcurses-info #2498

doc/man/man1/notcurses-info.1.md

@@ -45,7 +45,6 @@ The next five lines describe properties of the terminal environment:
   * af: Foreground color can be set
   * ab: Background color can be set
   * sum: Synchronized Update Mode is supported
-  * cup: Arbitrary cursor moves
   * vpa: Cursor can be moved to an absolute vertical coordinate
   * hpa: Cursor can be moved to an absolute horizontal coordinate
   * sgr0: Styling can be reset via a single escape
@@ -53,6 +52,7 @@ The next five lines describe properties of the terminal environment:
   * fgop: Foreground can be reset via a single escape
   * bgop: Background can be reset via a single escape
   * bce: The back-color-erase property is in play
+  * rect: Rectangular editing is available
 
 * The second line is more of the same:
   * bold: Boldface is available
@@ -75,9 +75,11 @@ The next five lines describe properties of the terminal environment:
   * vid: Video can be decoded
   * indn: Multiple-line scrolling is available
   * gpm: Connection is established to the GPM server
+  * kbd: The Kitty keyboard protocol is in use
 
 * The fourth line indicates the default background color, and whether that
-  color is treated as transparent.
+  color is treated as transparent by the terminal (only **kitty** is known
+  to do this), and the default foreground color.
 
 * The fifth line describes the available bitmap graphics. If Sixels are
   available, the maximum number of color registers and maximum Sixel
@@ -86,6 +88,9 @@ The next five lines describe properties of the terminal environment:
   with "rgba graphics are available"; if Kitty's animation support is also
   present, that will be reported with "rgba pixel animation support".
 
+To the right of this material is the Notcurses homepage's URI, and the
+Notcurses logo (the latter only if bitmap graphics are available).
+
 The final eleven lines, only printed when in a UTF8 locale, show various
 Unicode glyphs. The first four lines include the quadrant, sextant, and
 box-drawing characters. The next four lines include the entire Braille set.

src/info/main.c

@@ -422,7 +422,6 @@ tinfo_debug_caps(struct ncplane* n, const tinfo* ti, const char* indent){
   tinfo_debug_cap(n, "af", get_escape(ti, ESCAPE_SETAF));
   tinfo_debug_cap(n, "ab", get_escape(ti, ESCAPE_SETAB));
   tinfo_debug_cap(n, "sum", get_escape(ti, ESCAPE_BSUM));
-  tinfo_debug_cap(n, "cup", get_escape(ti, ESCAPE_CUP));
   tinfo_debug_cap(n, "vpa", get_escape(ti, ESCAPE_VPA));
   tinfo_debug_cap(n, "hpa", get_escape(ti, ESCAPE_HPA));
   tinfo_debug_cap(n, "sgr0", get_escape(ti, ESCAPE_SGR0));
@@ -430,6 +429,7 @@ tinfo_debug_caps(struct ncplane* n, const tinfo* ti, const char* indent){
   tinfo_debug_cap(n, "fgop", get_escape(ti, ESCAPE_FGOP));
   tinfo_debug_cap(n, "bgop", get_escape(ti, ESCAPE_BGOP));
   tinfo_debug_cap(n, "bce", ti->bce);
+  tinfo_debug_cap(n, "rect", get_escape(ti, ESCAPE_DECERA));
   finish_line(n);
 }
 

src/lib/in.c

@@ -1082,6 +1082,8 @@ da1_attrs_cb(inputctx* ictx){
           if(ictx->initdata->color_registers <= 0){
             ictx->initdata->color_registers = 256;
           }
+        }else if(curattr == 28){
+          ictx->initdata->rectangular_edits = true;
         }
         curattr = 0;
       }
@@ -1091,6 +1093,8 @@ da1_attrs_cb(inputctx* ictx){
       if(ictx->initdata->color_registers <= 0){
         ictx->initdata->color_registers = 256;
       }
+    }else if(curattr == 28){
+      ictx->initdata->rectangular_edits = true;
     }
     if(!foundsixel){
       scrub_sixel_responses(ictx->initdata);

src/lib/in.h

@@ -66,6 +66,7 @@ struct initial_responses {
   bool got_bg;                 // have we read default background?
   bool got_fg;                 // have we read default foreground?
   bool rgb;                    // was RGB DirectColor advertised?
+  bool rectangular_edits;      // were rectangular edits advertised?
   int pixx;                    // screen geometry in pixels
   int pixy;                    // screen geometry in pixels
   int dimx;                    // screen geometry in cells

src/lib/termdesc.c

@@ -1327,6 +1327,11 @@ int interrogate_terminfo(tinfo* ti, FILE* out, unsigned utf8,
       ti->sixel_maxy = iresp->sixely;
       ti->sixel_maxx = iresp->sixelx;
     }
+    if(iresp->rectangular_edits){
+      if(grow_esc_table(ti, "\x1b[6n", ESCAPE_DECERA, &tablelen, &tableused)){
+        goto err;
+      }
+    }
     free(iresp);
     if(nocbreak){
       // FIXME do this in input later, upon signaling completion?

src/lib/termdesc.h

@@ -84,6 +84,7 @@ typedef enum {
   ESCAPE_ESUM,     // End Synchronized Update Mode
   ESCAPE_SAVECOLORS,    // XTPUSHCOLORS (push palette/fg/bg)
   ESCAPE_RESTORECOLORS, // XTPOPCOLORS  (pop palette/fg/bg)
+  ESCAPE_DECERA,   // rectangular erase
   ESCAPE_MAX
 } escape_e;