Improvements to search mechanism (#216)

* Enable repeated search using empty search expression (`/` then `<enter>`)
* Quick note about how to repeat-search in the FAQ

cointop/cointop.go

@@ -69,6 +69,7 @@ type State struct {
 	refreshRate                time.Duration
 	running                    bool
 	searchFieldVisible         bool
+	lastSearchQuery            string
 	selectedCoin               *Coin
 	selectedChartRange         string
 	selectedView               string

cointop/search.go

@@ -66,7 +66,7 @@ func (ct *Cointop) DoSearch() error {
 	if n == 0 {
 		return nil
 	}
-	q := string(b)
+	q := strings.TrimSpace(string(b[:n]))
 	// remove slash
 	regex := regexp.MustCompile(`/(.*)`)
 	matches := regex.FindStringSubmatch(q)
@@ -78,13 +78,32 @@ func (ct *Cointop) DoSearch() error {
 
 // Search performs the search and filtering
 func (ct *Cointop) Search(q string) error {
-	log.Debug("Search()")
+	log.Debugf("Search(%s)", q)
+
+	// If there are no coins, return no result
+	if len(ct.State.coins) == 0 {
+		return nil
+	}
+
+	// If search term is empty, use the previous search term.
 	q = strings.TrimSpace(strings.ToLower(q))
+	if q == "" {
+		q = ct.State.lastSearchQuery
+	} else {
+		ct.State.lastSearchQuery = q
+	}
+
 	idx := -1
 	min := -1
 	var hasprefixidx []int
 	var hasprefixdist []int
-	for i := range ct.State.allCoins {
+
+	// Start the search from the current position (+1), looking names that start with the search term, or symbols that match completely
+	currentIndex := ct.GetGlobalCoinIndex(ct.HighlightedRowCoin()) + 1
+	if ct.IsLastPage() && ct.IsLastRow() {
+		currentIndex = 0
+	}
+	for i := currentIndex; i < len(ct.State.allCoins); i++ {
 		coin := ct.State.allCoins[i]
 		name := strings.ToLower(coin.Name)
 		symbol := strings.ToLower(coin.Symbol)

docs/content/faq.md

@@ -132,6 +132,7 @@ draft: false
 ## How do I search?
 
   The default key to open search is <kbd>/</kbd>. Type the search query after the `/` in the field and hit <kbd>Enter</kbd>.
+  Each search starts from the current cursor position. To search for the same term again, hit <kbd>/</kbd> then <kbd>Enter</kbd>.
 
 ## How do I exit search?