Add option to hide the Function Bar

Support three settings:
  - Always show Function Bar
  - Always hide the Function Bar, except in Infoscreens (Env/Locks...)
    and when editing the search and filter mode
  - Hide the Function Bar on ESC until the next user input

Closes: #439

Action.c

@@ -325,7 +325,7 @@ static Htop_Reaction actionKill(State* st) {
    if (sgn) {
       if (sgn->key != 0) {
          Panel_setHeader(st->panel, "Sending...");
-         Panel_draw(st->panel, false, true, true);
+         Panel_draw(st->panel, false, true, true, State_hideFunctionBar(st));
          refresh();
          MainPanel_foreachProcess((MainPanel*)st->panel, Process_sendSignal, (Arg) { .i = sgn->key }, NULL);
          napms(500);

Action.h

@@ -41,6 +41,10 @@ typedef struct State_ {
    bool hideProcessSelection;
 } State;
 
+static inline bool State_hideFunctionBar(const State* st) {
+   return st->settings->hideFunctionBar == 2 || (st->settings->hideFunctionBar == 1 && st->hideProcessSelection);
+}
+
 typedef Htop_Reaction (*Htop_Action)(State* st);
 
 Object* Action_pickFromVector(State* st, Panel* list, int x, bool followProcess);

DisplayOptionsPanel.c

@@ -124,6 +124,7 @@ DisplayOptionsPanel* DisplayOptionsPanel_new(Settings* settings, ScreenManager*
    Panel_add(super, (Object*) NumberItem_newByRef("Update interval (in seconds)", &(settings->delay), -1, 1, 255));
    Panel_add(super, (Object*) CheckItem_newByRef("Highlight new and old processes", &(settings->highlightChanges)));
    Panel_add(super, (Object*) NumberItem_newByRef("- Highlight time (in seconds)", &(settings->highlightDelaySecs), 0, 1, 24*60*60));
+   Panel_add(super, (Object*) NumberItem_newByRef("Hide Function Bar (0 - off, 1 - on ESC until next input, 2 - permanently)", &(settings->hideFunctionBar), 0, 0, 2));
    #ifdef HAVE_LIBHWLOC
    Panel_add(super, (Object*) CheckItem_newByRef("Show topology when selecting affinity by default", &(settings->topologyAffinity)));
    #endif

InfoScreen.c

@@ -56,7 +56,7 @@ void InfoScreen_drawTitled(InfoScreen* this, const char* fmt, ...) {
    mvhline(0, 0, ' ', COLS);
    mvwprintw(stdscr, 0, 0, title);
    attrset(CRT_colors[DEFAULT_COLOR]);
-   Panel_draw(this->display, true, true, true);
+   Panel_draw(this->display, true, true, true, false);
 
    IncSet_drawBar(this->inc);
 }
@@ -89,7 +89,7 @@ void InfoScreen_run(InfoScreen* this) {
    bool looping = true;
    while (looping) {
 
-      Panel_draw(panel, false, true, true);
+      Panel_draw(panel, false, true, true, false);
       IncSet_drawBar(this->inc);
 
       if (this->inc->active) {

MainPanel.c

@@ -51,6 +51,7 @@ static HandlerResult MainPanel_eventHandler(Panel* super, int ch) {
 
    Htop_Reaction reaction = HTOP_OK;
 
+   /* reset on every normal key */
    if (ch != ERR && ch != KEY_RESIZE)
       this->state->hideProcessSelection = false;
 
@@ -160,8 +161,13 @@ bool MainPanel_foreachProcess(MainPanel* this, MainPanel_ForeachProcessFn fn, Ar
    return ok;
 }
 
-static void MainPanel_drawFunctionBar(Panel* super) {
+static void MainPanel_drawFunctionBar(Panel* super, bool hideFunctionBar) {
    MainPanel* this = (MainPanel*) super;
+
+   // Do not hide active search and filter bar.
+   if (hideFunctionBar && !this->inc->active)
+      return;
+
    IncSet_drawBar(this->inc);
    if (this->state->pauseProcessUpdate) {
       FunctionBar_append("PAUSED", CRT_colors[PAUSED]);

Panel.c

@@ -208,7 +208,7 @@ void Panel_splice(Panel* this, Vector* from) {
    this->needsRedraw = true;
 }
 
-void Panel_draw(Panel* this, bool force_redraw, bool focus, bool highlightSelected) {
+void Panel_draw(Panel* this, bool force_redraw, bool focus, bool highlightSelected, bool hideFunctionBar) {
    assert (this != NULL);
 
    int size = Vector_size(this->items);
@@ -217,6 +217,9 @@ void Panel_draw(Panel* this, bool force_redraw, bool focus, bool highlightSelect
    int x = this->x;
    int h = this->h;
 
+   if (hideFunctionBar)
+      h++;
+
    const int header_attr = focus
                          ? CRT_colors[PANEL_HEADER_FOCUS]
                          : CRT_colors[PANEL_HEADER_UNFOCUS];
@@ -319,8 +322,8 @@ void Panel_draw(Panel* this, bool force_redraw, bool focus, bool highlightSelect
 
    if (focus && (this->needsRedraw || force_redraw || !this->wasFocus)) {
       if (Panel_drawFunctionBarFn(this))
-         Panel_drawFunctionBar(this);
+         Panel_drawFunctionBar(this, hideFunctionBar);
-      else
+      else if (!hideFunctionBar)
          FunctionBar_draw(this->currentBar);
    }
 

Panel.h

@@ -36,7 +36,7 @@ typedef enum HandlerResult_ {
 #define EVENT_HEADER_CLICK_GET_X(ev_) ((ev_) + 10000)
 
 typedef HandlerResult (*Panel_EventHandler)(Panel*, int);
-typedef void (*Panel_DrawFunctionBar)(Panel*);
+typedef void (*Panel_DrawFunctionBar)(Panel*, bool);
 typedef void (*Panel_PrintHeader)(Panel*);
 
 typedef struct PanelClass_ {
@@ -50,7 +50,7 @@ typedef struct PanelClass_ {
 #define Panel_eventHandlerFn(this_)            As_Panel(this_)->eventHandler
 #define Panel_eventHandler(this_, ev_)         (assert(As_Panel(this_)->eventHandler), As_Panel(this_)->eventHandler((Panel*)(this_), ev_))
 #define Panel_drawFunctionBarFn(this_)         As_Panel(this_)->drawFunctionBar
-#define Panel_drawFunctionBar(this_)    (assert(As_Panel(this_)->drawFunctionBar), As_Panel(this_)->drawFunctionBar((Panel*)(this_)))
+#define Panel_drawFunctionBar(this_, hideFB_)  (assert(As_Panel(this_)->drawFunctionBar), As_Panel(this_)->drawFunctionBar((Panel*)(this_), hideFB_))
 #define Panel_printHeaderFn(this_)             As_Panel(this_)->printHeader
 #define Panel_printHeader(this_)               (assert(As_Panel(this_)->printHeader), As_Panel(this_)->printHeader((Panel*)(this_)))
 
@@ -118,7 +118,7 @@ int Panel_size(Panel* this);
 
 void Panel_setSelected(Panel* this, int selected);
 
-void Panel_draw(Panel* this, bool force_redraw, bool focus, bool highlightSelected);
+void Panel_draw(Panel* this, bool force_redraw, bool focus, bool highlightSelected, bool hideFunctionBar);
 
 void Panel_splice(Panel* this, Vector* from);
 

ScreenManager.c

@@ -123,7 +123,7 @@ static void ScreenManager_drawPanels(ScreenManager* this, int focus, bool force_
    const int nPanels = this->panelCount;
    for (int i = 0; i < nPanels; i++) {
       Panel* panel = (Panel*) Vector_get(this->panels, i);
-      Panel_draw(panel, force_redraw, i == focus, !((panel == this->state->panel) && this->state->hideProcessSelection));
+      Panel_draw(panel, force_redraw, i == focus, !((panel == this->state->panel) && this->state->hideProcessSelection), State_hideFunctionBar(this->state));
       mvvline(panel->y, panel->x + panel->w, ' ', panel->h);
    }
 }

Settings.c

@@ -221,6 +221,8 @@ static bool Settings_read(Settings* this, const char* fileName, int initialCpuCo
       } else if (String_eq(option[0], "right_meter_modes")) {
          Settings_readMeterModes(this, option[1], 1);
          didReadMeters = true;
+      } else if (String_eq(option[0], "hide_function_bar")) {
+         this->hideFunctionBar = atoi(option[1]);
       #ifdef HAVE_LIBHWLOC
       } else if (String_eq(option[0], "topology_affinity")) {
          this->topologyAffinity = !!atoi(option[1]);
@@ -315,6 +317,7 @@ bool Settings_write(Settings* this) {
    fprintf(fd, "left_meter_modes="); writeMeterModes(this, fd, 0);
    fprintf(fd, "right_meters="); writeMeters(this, fd, 1);
    fprintf(fd, "right_meter_modes="); writeMeterModes(this, fd, 1);
+   fprintf(fd, "hide_function_bar=%d\n", (int) this->hideFunctionBar);
    #ifdef HAVE_LIBHWLOC
    fprintf(fd, "topology_affinity=%d\n", (int) this->topologyAffinity);
    #endif
@@ -352,6 +355,7 @@ Settings* Settings_new(int initialCpuCount) {
    this->findCommInCmdline = true;
    this->stripExeFromCmdline = true;
    this->showMergedCommand = false;
+   this->hideFunctionBar = 0;
    #ifdef HAVE_LIBHWLOC
    this->topologyAffinity = false;
    #endif

Settings.h

@@ -64,6 +64,7 @@ typedef struct Settings_ {
    bool accountGuestInCPUMeter;
    bool headerMargin;
    bool enableMouse;
+   int hideFunctionBar;  // 0 - off, 1 - on ESC until next input, 2 - permanently
    #ifdef HAVE_LIBHWLOC
    bool topologyAffinity;
    #endif