Improve String_contains_i to allow for multiple terms

This enables:
* Multiple filters in the main panel and strace etc. views
* Multiple search terms

The search terms are separated by "|" and are still fixed strings
matched case-insensitive.

Added a multi flag at request of BenBE.

IncSet.c

@@ -85,7 +85,7 @@ static void updateWeakPanel(const IncSet* this, Panel* panel, Vector* lines) {
       const char* incFilter = this->modes[INC_FILTER].buffer;
       for (int i = 0; i < Vector_size(lines); i++) {
          ListItem* line = (ListItem*)Vector_get(lines, i);
-         if (String_contains_i(line->value, incFilter)) {
+         if (String_contains_i(line->value, incFilter, true)) {
             Panel_add(panel, (Object*)line);
             if (selected == (Object*)line) {
                Panel_setSelected(panel, n);
@@ -108,7 +108,7 @@ static void updateWeakPanel(const IncSet* this, Panel* panel, Vector* lines) {
 static bool search(const IncSet* this, Panel* panel, IncMode_GetPanelValue getPanelValue) {
    int size = Panel_size(panel);
    for (int i = 0; i < size; i++) {
-      if (String_contains_i(getPanelValue(panel, i), this->active->buffer)) {
+      if (String_contains_i(getPanelValue(panel, i), this->active->buffer, true)) {
          Panel_setSelected(panel, i);
          return true;
       }
@@ -148,7 +148,7 @@ static bool IncMode_find(const IncMode* mode, Panel* panel, IncMode_GetPanelValu
          return false;
       }
 
-      if (String_contains_i(getPanelValue(panel, i), mode->buffer)) {
+      if (String_contains_i(getPanelValue(panel, i), mode->buffer, true)) {
          Panel_setSelected(panel, i);
          return true;
       }

InfoScreen.c

@@ -63,7 +63,7 @@ void InfoScreen_drawTitled(InfoScreen* this, const char* fmt, ...) {
 void InfoScreen_addLine(InfoScreen* this, const char* line) {
    Vector_add(this->lines, (Object*) ListItem_new(line, 0));
    const char* incFilter = IncSet_filter(this->inc);
-   if (!incFilter || String_contains_i(line, incFilter)) {
+   if (!incFilter || String_contains_i(line, incFilter, true)) {
       Panel_add(this->display, Vector_get(this->lines, Vector_size(this->lines) - 1));
    }
 }
@@ -72,7 +72,7 @@ void InfoScreen_appendLine(InfoScreen* this, const char* line) {
    ListItem* last = (ListItem*)Vector_get(this->lines, Vector_size(this->lines) - 1);
    ListItem_append(last, line);
    const char* incFilter = IncSet_filter(this->inc);
-   if (incFilter && Panel_get(this->display, Panel_size(this->display) - 1) != (Object*)last && String_contains_i(line, incFilter)) {
+   if (incFilter && Panel_get(this->display, Panel_size(this->display) - 1) != (Object*)last && String_contains_i(line, incFilter, true)) {
       Panel_add(this->display, (Object*)last);
    }
 }

ProcessList.c

@@ -394,7 +394,7 @@ void ProcessList_rebuildPanel(ProcessList* this) {
 
       if ( (!p->show)
          || (this->userId != (uid_t) -1 && (p->st_uid != this->userId))
-         || (incFilter && !(String_contains_i(Process_getCommand(p), incFilter)))
+         || (incFilter && !(String_contains_i(Process_getCommand(p), incFilter, true)))
          || (this->pidMatchList && !Hashtable_get(this->pidMatchList, p->tgid)) )
          continue;
 

XUtils.c

@@ -94,8 +94,22 @@ void* xReallocArrayZero(void* ptr, size_t prevmemb, size_t newmemb, size_t size)
    return ret;
 }
 
-inline bool String_contains_i(const char* s1, const char* s2) {
+inline bool String_contains_i(const char* s1, const char* s2, bool multi) {
-   return strcasestr(s1, s2) != NULL;
+   // we have a multi-string search term, handle as special case for performance reasons
+   if (multi && strstr(s2, "|")) {
+      size_t nNeedles;
+      char** needles = String_split(s2, '|', &nNeedles);
+      for (size_t i = 0; i < nNeedles; i++) {
+         if (strcasestr(s1, needles[i]) != NULL) {
+            String_freeArray(needles);
+            return true;
+         }
+       }
+       String_freeArray(needles);
+       return false;
+   } else {
+      return strcasestr(s1, s2) != NULL;
+   }
 }
 
 char* String_cat(const char* s1, const char* s2) {

XUtils.h

@@ -40,7 +40,7 @@ static inline bool String_startsWith(const char* s, const char* match) {
    return strncmp(s, match, strlen(match)) == 0;
 }
 
-bool String_contains_i(const char* s1, const char* s2);
+bool String_contains_i(const char* s1, const char* s2, bool multi);
 
 static inline bool String_eq(const char* s1, const char* s2) {
    return strcmp(s1, s2) == 0;

generic/uname.c

@@ -85,7 +85,7 @@ char* Generic_uname(void) {
 
       if (uname_result == 0) {
          size_t written = xSnprintf(savedString, sizeof(savedString), "%s %s [%s]", uname_info.sysname, uname_info.release, uname_info.machine);
-         if (!String_contains_i(savedString, distro) && sizeof(savedString) > written)
+         if (!String_contains_i(savedString, distro, false) && sizeof(savedString) > written)
             snprintf(savedString + written, sizeof(savedString) - written, " @ %s", distro);
       } else {
          snprintf(savedString, sizeof(savedString), "%s", distro);

htop.1.in

@@ -50,7 +50,8 @@ Start
 in monochrome mode
 .TP
 \fB\-F \-\-filter=FILTER
-Filter processes by command
+Filter processes by terms matching the commands. The terms are matched
+case-insensitive and as fixed strings (not regexs). You can separate multiple terms with "|".
 .TP
 \fB\-h \-\-help
 Display a help message and exit
@@ -175,6 +176,8 @@ bindings take precedence.
 Incremental process filtering: type in part of a process command line and
 only processes whose names match will be shown. To cancel filtering,
 enter the Filter option again and press Esc.
+The matching is done case-insensitive. Terms are fixed strings (no regex).
+You can separate multiple terms with "|".
 .TP
 .B F5, t
 Tree view: organize processes by parenthood, and layout the relations