config: add 'pipe-selected' key binding

This works just like pipe-visible and pipe-scrollback, but pipes the
user-selected text, if any, to the external tool.

Closes #51

CHANGELOG.md

@@ -22,6 +22,9 @@
   (https://codeberg.org/dnkl/foot/issues/42).
 * Key bindings in _scollback search_ mode are now configurable.
 * `--check-config` command line option.
+* **pipe-selected** key binding. Works like **pipe-visible** and
+  **pipe-scrollback**, but only pipes the currently selected text, if
+  any (https://codeberg.org/dnkl/foot/issues/51).
 
 
 ### Deprecated

config.c

@@ -66,6 +66,7 @@ static const char *const binding_action_map[] = {
     [BIND_ACTION_FULLSCREEN] = "fullscreen",
     [BIND_ACTION_PIPE_SCROLLBACK] = "pipe-scrollback",
     [BIND_ACTION_PIPE_VIEW] = "pipe-visible",
+    [BIND_ACTION_PIPE_SELECTED] = "pipe-selected",
 };
 
 static_assert(ALEN(binding_action_map) == BIND_ACTION_COUNT,

doc/footrc.5.scd

@@ -251,11 +251,11 @@ e.g. *search-start=none*.
 *fullscreen*
 	Toggles the fullscreen state. Default: _not bound_.
 
-*pipe-visible*, *pipe-scrollback*
-	Pipes the currently visible text, or the entire scrollback, to an
-	external tool. The syntax for this option is a bit special; the
-	first part of the value is the command to execute enclosed in
-	"[]", followed by the binding(s).
+*pipe-visible*, *pipe-scrollback*, *pipe-selected*
+	Pipes the currently visible text, the entire scrollback, or the
+	currently selected text to an external tool. The syntax for this
+	option is a bit special; the first part of the value is the
+	command to execute enclosed in "[]", followed by the binding(s).
 	
 	You can configure multiple pipes as long as the command strings
 	are different and the key bindings are unique.

footrc

@@ -64,6 +64,8 @@
 # fullscreen=none
 # pipe-visible=[sh -c "xurls | bemenu | xargs -r firefox"] none
 # pipe-scrollback=[sh -c "xurls | bemenu | xargs -r firefox"] none
+# pipe-selected=[xargs -r firefox] none
+
 
 [search-bindings]
 # cancel=Control+g Escape

input.c

@@ -145,7 +145,8 @@ execute_binding(struct seat *seat, struct terminal *term,
         break;
 
     case BIND_ACTION_PIPE_SCROLLBACK:
-    case BIND_ACTION_PIPE_VIEW: {
+    case BIND_ACTION_PIPE_VIEW:
+    case BIND_ACTION_PIPE_SELECTED: {
         if (pipe_argv == NULL)
             break;
 
@@ -171,9 +172,27 @@ execute_binding(struct seat *seat, struct terminal *term,
             goto pipe_err;
         }
 
-        bool success = action == BIND_ACTION_PIPE_SCROLLBACK
-            ? term_scrollback_to_text(term, &text, &len)
-            : term_view_to_text(term, &text, &len);
+        bool success;
+        switch (action) {
+        case BIND_ACTION_PIPE_SCROLLBACK:
+            success = term_scrollback_to_text(term, &text, &len);
+            break;
+
+        case BIND_ACTION_PIPE_VIEW:
+            success = term_view_to_text(term, &text, &len);
+            break;
+
+        case BIND_ACTION_PIPE_SELECTED:
+            text = selection_to_text(term);
+            success = text != NULL;
+            len = text != NULL ? strlen(text) : 0;
+            break;
+
+        default:
+            assert(false);
+            success = false;
+            break;
+        }
 
         if (!success)
             goto pipe_err;

selection.c

@@ -204,9 +204,12 @@ extract_one_const_wrapper(struct terminal *term,
     return extract_one(term, row, cell, col, data);
 }
 
-static char *
-extract_selection(const struct terminal *term)
+char *
+selection_to_text(const struct terminal *term)
 {
+    if (term->selection.end.row == -1)
+        return NULL;
+
     struct extraction_context *ctx = extract_begin(term->selection.kind);
     if (ctx == NULL)
         return NULL;
@@ -873,7 +876,7 @@ selection_to_clipboard(struct seat *seat, struct terminal *term, uint32_t serial
         return;
 
     /* Get selection as a string */
-    char *text = extract_selection(term);
+    char *text = selection_to_text(term);
     if (!text_to_clipboard(seat, term, text, serial))
         free(text);
 }
@@ -1074,7 +1077,7 @@ selection_to_primary(struct seat *seat, struct terminal *term, uint32_t serial)
         return;
 
     /* Get selection as a string */
-    char *text = extract_selection(term);
+    char *text = selection_to_text(term);
     if (!text_to_primary(seat, term, text, serial))
         free(text);
 }

selection.h

@@ -30,6 +30,7 @@ void selection_mark_word(
 void selection_mark_row(
     struct seat *seat, struct terminal *term, int row, uint32_t serial);
 
+char *selection_to_text(const struct terminal *term);
 void selection_to_clipboard(
     struct seat *seat, struct terminal *term, uint32_t serial);
 void selection_from_clipboard(

wayland.h

@@ -41,6 +41,7 @@ enum bind_action_normal {
     BIND_ACTION_FULLSCREEN,
     BIND_ACTION_PIPE_SCROLLBACK,
     BIND_ACTION_PIPE_VIEW,
+    BIND_ACTION_PIPE_SELECTED,
     BIND_ACTION_COUNT,
 };