refactor: naming & caching of sheet names

gshmm.go

@@ -60,20 +60,13 @@ func readPDF(name string) (string, error) {
 
 // model offers the core of the state for the entire UI.
 type model struct {
-	filterInput       textinput.Model // Fuzzy search interface
-	datasheets        []datasheet     // All datasheets under cwd
-	datasheetsView    []string        // Filtered view on all datasheets
-	datasheetViewport viewport.Model  // Viewport for the PDF content
-}
+	input textinput.Model // Fuzzy search interface
 
-// datasheetNames lists all datasheet names.
-func (m model) datasheetNames() []string {
-	// TODO: cache this somewhere, it's called several times... in the model?
-	var names []string
-	for _, datasheet := range m.datasheets {
-		names = append(names, datasheet.filename)
-	}
-	return names
+	datasheets         []datasheet // All datasheets under cwd
+	datasheetNames     []string    // All datasheet names (caching)
+	filteredDatasheets []string    // Filtered view on all datasheets
+
+	datasheetViewport viewport.Model // Viewport for the PDF content
 }
 
 // datasheetFromName retrieves a datasheet via a name.
@@ -98,7 +91,9 @@ func initialModel() model {
 	input := textinput.New()
 	input.Focus()
 
-	var ds []datasheet
+	var datasheets []datasheet
+	var datasheetNames []string
+
 	// TODO: handle error in interface?
 	_ = filepath.Walk(".", func(path string, info os.FileInfo, err error) error {
 		if err != nil {
@@ -112,12 +107,15 @@ func initialModel() model {
 			//       we could run this in a goroutine somewhere
 			//       this currently slows down startup time
 			contents, _ := readPDF(path)
-			d := datasheet{
+
+			datasheet := datasheet{
 				filename: name,
 				absPath:  path,
 				contents: contents,
 			}
-			ds = append(ds, d)
+
+			datasheets = append(datasheets, datasheet)
+			datasheetNames = append(datasheetNames, name)
 		}
 
 		return nil
@@ -125,14 +123,16 @@ func initialModel() model {
 
 	// TODO: set width/heigh to match terminal
 	viewp := viewport.New(60, 30)
-	viewp.SetContent(ds[len(ds)-1].contents)
+	selectedDatasheet := datasheets[len(datasheets)-1].contents
+	viewp.SetContent(selectedDatasheet)
 
 	m := model{
-		filterInput:       input,
-		datasheets:        ds,
+		input:              input,
+		datasheets:         datasheets,
+		datasheetNames:     datasheetNames,
+		filteredDatasheets: datasheetNames,
 		datasheetViewport:  viewp,
 	}
-	m.datasheetsView = m.datasheetNames()
 
 	return m
 }
@@ -149,29 +149,29 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		cmds []tea.Cmd
 	)
 
-	if m.filterInput.Focused() {
-		var matched []string
+	if m.input.Focused() {
+		var matchedDatasheets []string
 
-		search := m.filterInput.Value()
+		search := m.input.Value()
 		if len(search) >= minCharsUntilFilter {
-			matches := fuzzy.Find(search, m.datasheetNames())
+			matches := fuzzy.Find(search, m.datasheetNames)
 			for _, match := range matches {
-				matched = append(matched, match.Str)
+				matchedDatasheets = append(matchedDatasheets, match.Str)
 			}
 
 			if len(matches) > 0 {
-				m.datasheetsView = matched
+				m.filteredDatasheets = matchedDatasheets
 			} else {
-				m.datasheetsView = m.datasheetNames()
+				m.filteredDatasheets = m.datasheetNames
 			}
 		} else {
-			m.datasheetsView = m.datasheetNames()
+			m.filteredDatasheets = m.datasheetNames
 		}
 
 		// TODO: implement cursor for scrolling up/down filtered
 		//       results so we can view the PDF contents as desired
 		//       it's currently just the last one (closest to input)
-		lastdatasheet := m.datasheetsView[len(m.datasheetsView)-1]
+		lastdatasheet := m.filteredDatasheets[len(m.filteredDatasheets)-1]
 		viewportText := m.datasheetFromName(lastdatasheet)
 		m.datasheetViewport.SetContent(viewportText)
 	}
@@ -185,7 +185,7 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		}
 	}
 
-	m.filterInput, cmd = m.filterInput.Update(msg)
+	m.input, cmd = m.input.Update(msg)
 	cmds = append(cmds, cmd)
 
 	m.datasheetViewport, cmd = m.datasheetViewport.Update(msg)
@@ -199,14 +199,14 @@ func (m model) View() string {
 	body := strings.Builder{}
 
 	// TODO: paginate / trim view to last 10 or something?
-	sheets := strings.Join(m.datasheetsView, "\n")
+	sheets := strings.Join(m.filteredDatasheets, "\n")
 
 	// TODO: style further with lipgloss, e.g. borders, margins, etc.
 	panes := lipgloss.JoinHorizontal(lipgloss.Left, sheets, m.datasheetViewport.View())
 
 	body.WriteString(panes)
 
-	body.WriteString("\n" + m.filterInput.View())
+	body.WriteString("\n" + m.input.View())
 
 	return body.String()
 }