[search] start searching a couple thousand lines before the top

src/strong_int.hh

@@ -44,7 +44,7 @@
 template<typename T, class DISTINCT>
 class strong_int {
 public:
-    explicit constexpr strong_int(T v = 0) : value(v) { };
+    explicit constexpr strong_int(T v = 0) noexcept : value(v) { };
     operator const T &() const { return this->value; };
     strong_int operator+(const strong_int &rhs)
     {
@@ -72,17 +72,17 @@ public:
         this->value -= rhs.value;
         return *this;
     };
-    strong_int &operator-(void)
+    strong_int &operator-()
     {
         this->value = -this->value;
         return *this;
     };
-    strong_int &operator++(void) { this->value++; return *this; };
-    strong_int &operator--(void) { this->value--; return *this; };
+    strong_int &operator++() { this->value++; return *this; };
+    strong_int &operator--() { this->value--; return *this; };
     bool operator==(const strong_int &rhs) const {
         return this->value == rhs.value;
     };
-    T *out(void) { return &this->value; };
+    T *out() { return &this->value; };
 private:
     T value;
 };

src/textview_curses.cc

@@ -44,6 +44,8 @@
 
 using namespace std;
 
+const auto REVERSE_SEARCH_OFFSET = 2000_vl;
+
 void
 text_filter::revert_to_last(logfile_filter_state &lfs, size_t rollback_size)
 {
@@ -470,9 +472,15 @@ void textview_curses::execute_search(const std::string &regex_orig)
             unique_ptr<grep_proc<vis_line_t>> gp = make_unique<grep_proc<vis_line_t>>(code, *this);
 
             gp->set_sink(this);
-            gp->queue_request(this->get_top());
-            if (this->get_top() > 0) {
-                gp->queue_request(0_vl, this->get_top());
+            auto top = this->get_top();
+            if (top < REVERSE_SEARCH_OFFSET) {
+                top = 0_vl;
+            } else {
+                top -= REVERSE_SEARCH_OFFSET;
+            }
+            gp->queue_request(top);
+            if (top > 0) {
+                gp->queue_request(0_vl, top);
             }
             gp->start();