Add ctrl+u/d/b/f vim keys (#582)

Ctrl+u/d = fast scroll up/down
Ctrl+b/f = page up/down

src/btop_config.cpp

@@ -63,7 +63,7 @@ namespace Config {
 								"#* Use whitespace \" \" as separator between different presets.\n"
 								"#* Example: \"cpu:0:default,mem:0:tty,proc:1:default cpu:0:braille,proc:0:tty\""},
 
-		{"vim_keys",			"#* Set to True to enable \"h,j,k,l,g,G\" keys for directional control in lists.\n"
+		{"vim_keys",			"#* Set to True to enable \"h,j,k,l,g,G,ctrl+u/d/b/f\" keys for directional control in lists.\n"
 								"#* Conflicting keys for h:\"help\" and k:\"kill\" is accessible while holding shift."},
 
 		{"rounded_corners",		"#* Rounded corners on boxes, is ignored if TTY mode is ON."},

src/btop_draw.cpp

@@ -1501,11 +1501,11 @@ namespace Proc {
 			}
 			else selected++;
 		}
-		else if (cmd_key == "page_up") {
+		else if (cmd_key == "page_up" or (vim_keys and cmd_key == "ctrl+b")) {
 			if (selected > 0 and start == 0) selected = 0;
 			else start = max(0, start - select_max);
 		}
-		else if (cmd_key == "page_down") {
+		else if (cmd_key == "page_down" or (vim_keys and cmd_key == "ctrl+f")) {
 			if (selected > 0 and start >= numpids - select_max) selected = select_max;
 			else start = clamp(start + select_max, 0, max(0, numpids - select_max));
 		}
@@ -1517,6 +1517,21 @@ namespace Proc {
 			start = max(0, numpids - select_max);
 			if (selected > 0) selected = select_max;
 		}
+		else if (vim_keys and cmd_key == "ctrl+u") {
+			if (start > 0 and selected <= 10) {
+				start = max(0, start - 10);
+			}
+			else selected = max(0, selected - 10);
+			if (Config::getI("proc_last_selected") > 0) Config::set("proc_last_selected", 0);
+		}
+		else if (vim_keys and cmd_key == "ctrl+d") {
+			if (start < numpids - select_max and selected == select_max) start += 10;
+			else if (selected == 0 and last_selected > 0) {
+				selected = last_selected;
+				Config::set("proc_last_selected", 0);
+			}
+			else selected += 10;
+		}
 		else if (cmd_key.starts_with("mousey")) {
 			int mouse_y = std::stoi(cmd_key.substr(6));
 			start = clamp((int)round((double)mouse_y * (numpids - select_max - 2) / (select_max - 2)), 0, max(0, numpids - select_max));

src/btop_input.cpp

@@ -65,6 +65,10 @@ namespace Input {
 		{"[6~",		"page_down"},
 		{"\t",		"tab"},
 		{"[Z",		"shift_tab"},
+		{"\x15",	"ctrl+u"},
+		{"\x04",	"ctrl+d"},
+		{"\x06",	"ctrl+f"},
+		{"\x02",	"ctrl+b"},
 		{"OP",		"f1"},
 		{"OQ",		"f2"},
 		{"OR",		"f3"},
@@ -407,7 +411,7 @@ namespace Input {
 					Menu::show(Menu::Menus::SignalChoose);
 					return;
 				}
-				else if (is_in(key, "up", "down", "page_up", "page_down", "home", "end") or (vim_keys and is_in(key, "j", "k", "g", "G"))) {
+				else if (is_in(key, "up", "down", "page_up", "page_down", "home", "end") or (vim_keys and is_in(key, "j", "k", "g", "G", "ctrl+d", "ctrl+u", "ctrl+f", "ctrl+b"))) {
 					proc_mouse_scroll:
 					redraw = false;
 					auto old_selected = Config::getI("proc_selected");

src/btop_menu.cpp

@@ -246,6 +246,8 @@ namespace Menu {
 				"Enable vim keys.",
 				"Set to True to enable \"h,j,k,l\" keys for",
 				"directional control in lists.",
+				"Also enables ctrl + u/d for quicker scrolling",
+				"and ctrl + f/b for page up/down.",
 				"",
 				"Conflicting keys for",
 				"h (help) and k (kill)",