From 8bd969262b091b910560d183c57df5ee09805fbb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Wed, 17 Jul 2019 21:30:57 +0200
Subject: [PATCH] selection: implement double-click-to-select-word

---
 input.c     | 28 ++++++++++++++++++----
 selection.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 selection.h |  1 +
 terminal.h  |  3 +++
 4 files changed, 97 insertions(+), 4 deletions(-)

diff --git a/input.c b/input.c
index a50f76cf..6c5353ca 100644
--- a/input.c
+++ b/input.c
@@ -6,6 +6,7 @@
 #include <threads.h>
 #include <locale.h>
 #include <sys/mman.h>
+#include <sys/time.h>
 
 #include <linux/input-event-codes.h>
 
@@ -354,19 +355,38 @@ wl_pointer_button(void *data, struct wl_pointer *wl_pointer,
     struct terminal *term = data;
 
     switch (state) {
-    case WL_POINTER_BUTTON_STATE_PRESSED:
-        if (button == BTN_LEFT)
-            selection_start(term, term->mouse.col, term->mouse.row);
-        else {
+    case WL_POINTER_BUTTON_STATE_PRESSED: {
+        bool double_click = false;
+
+        struct timeval now;
+        gettimeofday(&now, NULL);
+
+        struct timeval since_last;
+        timersub(&now, &term->mouse.last_time, &since_last);
+        if (button == term->mouse.last_button &&
+            since_last.tv_sec == 0 && since_last.tv_usec <= 300 * 1000)
+        {
+            double_click = true;
+        }
+
+        if (button == BTN_LEFT) {
+            if (double_click)
+                selection_mark_word(term, term->mouse.col, term->mouse.row, serial);
+            else
+                selection_start(term, term->mouse.col, term->mouse.row);
+        } else {
             if (button == BTN_MIDDLE)
                 selection_from_primary(term);
             selection_cancel(term);
         }
 
         term->mouse.button = button; /* For motion events */
+        term->mouse.last_button = button;
+        term->mouse.last_time = now;
         term_mouse_down(term, button, term->mouse.row, term->mouse.col,
                         term->kbd.shift, term->kbd.alt, term->kbd.ctrl);
         break;
+    }
 
     case WL_POINTER_BUTTON_STATE_RELEASED:
         if (button != BTN_LEFT || term->selection.end.col == -1)
diff --git a/selection.c b/selection.c
index 76b4d3dc..73a20b40 100644
--- a/selection.c
+++ b/selection.c
@@ -1,5 +1,6 @@
 #include "selection.h"
 
+#include <ctype.h>
 #include <string.h>
 #include <unistd.h>
 #include <fcntl.h>
@@ -214,6 +215,74 @@ selection_cancel(struct terminal *term)
     }
 }
 
+void
+selection_mark_word(struct terminal *term, int col, int row, uint32_t serial)
+{
+    if (!selection_enabled(term))
+        return;
+
+    selection_cancel(term);
+
+    struct coord start = {col, row};
+    struct coord end = {col, row};
+
+    const struct row *r = grid_row_in_view(term->grid, start.row);
+    unsigned char c = r->cells[start.col].c[0];
+
+    if (!(c == '\0' || isspace(c))) {
+        while (true) {
+            int next_col = start.col - 1;
+            int next_row = start.row;
+
+            /* Linewrap */
+            if (next_col < 0) {
+                next_col = term->cols - 1;
+                if (--next_row < 0)
+                    break;
+            }
+
+            const struct row *row = grid_row_in_view(term->grid, next_row);
+
+            unsigned char c = row->cells[next_col].c[0];
+            if (c == '\0' || isspace(c))
+                break;
+
+            start.col = next_col;
+            start.row = next_row;
+        }
+    }
+
+    r = grid_row_in_view(term->grid, end.row);
+    c = r->cells[end.col].c[0];
+
+    if (!(c == '\0' || isspace(c))) {
+        while (true) {
+            int next_col = end.col + 1;
+            int next_row = end.row;
+
+            /* Linewrap */
+            if (next_col >= term->cols) {
+                next_col = 0;
+                if (++next_row >= term->rows)
+                    break;
+            }
+
+            const struct row *row = grid_row_in_view(term->grid, next_row);
+
+            unsigned char c = row->cells[next_col].c[0];
+            if (c == '\0' || isspace(c))
+                break;
+
+            end.col = next_col;
+            end.row = next_row;
+        }
+    }
+
+    selection_start(term, start.col, start.row);
+    selection_update(term, end.col, end.row);
+    selection_finalize(term, serial);
+}
+
 static void
 target(void *data, struct wl_data_source *wl_data_source, const char *mime_type)
 {
diff --git a/selection.h b/selection.h
index f6edfd5f..772f5a73 100644
--- a/selection.h
+++ b/selection.h
@@ -11,6 +11,7 @@ void selection_start(struct terminal *term, int col, int row);
 void selection_update(struct terminal *term, int col, int row);
 void selection_finalize(struct terminal *term, uint32_t serial);
 void selection_cancel(struct terminal *term);
+void selection_mark_word(struct terminal *term, int col, int row, uint32_t serial);
 
 void selection_to_clipboard(struct terminal *term, uint32_t serial);
 void selection_from_clipboard(struct terminal *term, uint32_t serial);
diff --git a/terminal.h b/terminal.h
index 71a77ddb..d17d2128 100644
--- a/terminal.h
+++ b/terminal.h
@@ -253,6 +253,9 @@ struct terminal {
         int col;
         int row;
         int button;
+
+        int last_button;
+        struct timeval last_time;
     } mouse;
 
     struct coord cursor;