🚧 Everything uses tab struct, no compile errors, untested

CHANGELOG.md

@@ -13,6 +13,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 - Pages are rewrapped dynamically, whenever the terminal size changes (#33)
 
+### Fixed
+- Many potential loading race conditions eliminated
+
 ## [1.2.0] - 2020-07-02
 ### Added
 - Alt-Left and Alt-Right for history navigation (#23)

NOTES.md

@@ -1,9 +1,6 @@
 # Notes
 
-- Simplify into one struct
-  - All the maps and stuff could be replaced with a `tab` struct
-  - And then just one single map of tab number to `tab`
-  - URL for each tab should not be stored as a string - in the current code there's lots of reparsing the URL
+- URL for each tab should not be stored as a string - in the current code there's lots of reparsing the URL
 
 ## Upstream Bugs
 - Wrapping messes up on brackets

display/bookmarks.go

@@ -113,27 +113,27 @@ func Bookmarks() {
 		Width:     termW,
 		Mediatype: structs.TextGemini,
 	}
-	setPage(&page)
+	setPage(curTab, &page)
 }
 
 // addBookmark goes through the process of adding a bookmark for the current page.
 // It is the high-level way of doing it. It should be called in a goroutine.
 // It can also be called to edit an existing bookmark.
 func addBookmark() {
-	if !strings.HasPrefix(tabMap[curTab].Url, "gemini://") {
+	if !strings.HasPrefix(tabs[curTab].page.Url, "gemini://") {
 		// Can't make bookmarks for other kinds of URLs
 		return
 	}
 
-	name, exists := bookmarks.Get(tabMap[curTab].Url)
+	name, exists := bookmarks.Get(tabs[curTab].page.Url)
 	// Open a bookmark modal with the current name of the bookmark, if it exists
 	newName, action := openBkmkModal(name, exists)
 	switch action {
 	case 1:
 		// Add/change the bookmark
-		bookmarks.Set(tabMap[curTab].Url, newName)
+		bookmarks.Set(tabs[curTab].page.Url, newName)
 	case -1:
-		bookmarks.Remove(tabMap[curTab].Url)
+		bookmarks.Remove(tabs[curTab].page.Url)
 	}
 	// Other case is action = 0, meaning "Cancel", so nothing needs to happen
 }

display/display.go

@@ -6,7 +6,6 @@ import (
 	"path"
 	"strconv"
 	"strings"
-	"sync"
 
 	"github.com/gdamore/tcell"
 	"github.com/makeworld-the-better-one/amfora/cache"
@@ -16,19 +15,13 @@ import (
 	"gitlab.com/tslocum/cview"
 )
 
-var curTab = -1                          // What number tab is currently visible, -1 means there are no tabs at all
-var tabMap = make(map[int]*structs.Page) // Map of tab number to page
-// Holds the actual tab primitives
-var tabViews = make(map[int]*cview.TextView)
+var tabs []*tab // Slice of all the current browser tabs
+var curTab = -1 // What tab is currently visible - index for the tabs slice (-1 means there are no tabs)
 
 // Terminal dimensions
 var termW int
 var termH int
 
-// The link currently selected when in link selection mode
-// Set to "" when not in that mode
-var selectedLink string
-
 // The user input and URL display bar at the bottom
 var bottomBar = cview.NewInputField().
 	SetFieldBackgroundColor(tcell.ColorWhite).
@@ -74,8 +67,6 @@ var renderedNewTabContent string
 var newTabLinks []string
 var newTabPage *structs.Page
 
-var reformatMuts = make(map[int]*sync.Mutex) // Mutex for each tab
-
 var App = cview.NewApplication().
 	EnableMouse(false).
 	SetRoot(layout, true).
@@ -86,10 +77,10 @@ var App = cview.NewApplication().
 
 		// Make sure the current tab content is reformatted when the terminal size changes
 		go func(tab int) {
-			reformatMuts[tab].Lock() // Only one reformat job per tab
-			defer reformatMuts[tab].Unlock()
+			tabs[tab].reformatMut.Lock() // Only one reformat job per tab
+			defer tabs[tab].reformatMut.Unlock()
 			// Use the current tab, but don't affect other tabs if the user switches tabs
-			reformatPageAndSetView(tab, tabMap[tab])
+			reformatPageAndSetView(tab, tabs[tab].page)
 		}(curTab)
 	})
 
@@ -109,6 +100,8 @@ func Init() {
 	bottomBar.SetDoneFunc(func(key tcell.Key) {
 		defer bottomBar.SetLabel("")
 
+		tab := curTab
+
 		switch key {
 		case tcell.KeyEnter:
 			// Figure out whether it's a URL, link number, or search
@@ -118,21 +111,23 @@ func Init() {
 
 			if strings.TrimSpace(query) == "" {
 				// Ignore
-				bottomBar.SetText(tabMap[curTab].Url)
-				App.SetFocus(tabViews[curTab])
+				bottomBar.SetText(tabs[tab].page.Url)
+				tabs[tab].saveBottomBar() // Store new bottomBar text
+				App.SetFocus(tabs[tab].view)
 				return
 			}
-			if query == ".." && tabHasContent() {
+			if query == ".." && tabs[tab].hasContent() {
 				// Go up a directory
-				parsed, err := url.Parse(tabMap[curTab].Url)
+				parsed, err := url.Parse(tabs[tab].page.Url)
 				if err != nil {
 					// This shouldn't occur
 					return
 				}
 				if parsed.Path == "/" {
 					// Can't go up further
-					bottomBar.SetText(tabMap[curTab].Url)
-					App.SetFocus(tabViews[curTab])
+					bottomBar.SetText(tabs[tab].page.Url)
+					tabs[tab].saveBottomBar()
+					App.SetFocus(tabs[tab].view)
 					return
 				}
 
@@ -154,13 +149,13 @@ func Init() {
 					if err != nil {
 						return
 					}
-					if i <= len(tabMap[curTab].Links) && i > 0 {
+					if i <= len(tabs[tab].page.Links) && i > 0 {
 						// Open new tab and load link
-						oldTab := curTab
+						oldTab := tab
 						NewTab()
 						// Resolve and follow link manually
-						prevParsed, _ := url.Parse(tabMap[oldTab].Url)
-						nextParsed, err := url.Parse(tabMap[oldTab].Links[i-1])
+						prevParsed, _ := url.Parse(tabs[oldTab].page.Url)
+						nextParsed, err := url.Parse(tabs[oldTab].page.Links[i-1])
 						if err != nil {
 							Error("URL Error", "link URL could not be parsed")
 							return
@@ -183,19 +178,21 @@ func Init() {
 					return
 				}
 			}
-			if i <= len(tabMap[curTab].Links) && i > 0 {
+			if i <= len(tabs[tab].page.Links) && i > 0 {
 				// It's a valid link number
-				followLink(tabMap[curTab].Url, tabMap[curTab].Links[i-1])
+				followLink(tab, tabs[tab].page.Url, tabs[tab].page.Links[i-1])
 				return
 			}
 			// Invalid link number, don't do anything
-			bottomBar.SetText(tabMap[curTab].Url)
-			App.SetFocus(tabViews[curTab])
+			bottomBar.SetText(tabs[tab].page.Url)
+			tabs[tab].saveBottomBar()
+			App.SetFocus(tabs[tab].view)
 
 		case tcell.KeyEscape:
 			// Set back to what it was
-			bottomBar.SetText(tabMap[curTab].Url)
-			App.SetFocus(tabViews[curTab])
+			bottomBar.SetText(tabs[tab].page.Url)
+			tabs[tab].saveBottomBar()
+			App.SetFocus(tabs[tab].view)
 		}
 		// Other potential keys are Tab and Backtab, they are ignored
 	})
@@ -241,16 +238,16 @@ func Init() {
 
 		switch event.Key() {
 		case tcell.KeyCtrlT:
-			if selectedLink == "" {
-				NewTab()
-			} else {
-				next, err := resolveRelLink(tabMap[curTab].Url, selectedLink)
+			if tabs[curTab].mode == modeLinkSelect {
+				next, err := resolveRelLink(curTab, tabs[curTab].page.Url, tabs[curTab].selected)
 				if err != nil {
 					Error("URL Error", err.Error())
 					return nil
 				}
 				NewTab()
 				URL(next)
+			} else {
+				NewTab()
 			}
 			return nil
 		case tcell.KeyCtrlW:
@@ -267,16 +264,16 @@ func Init() {
 			return nil
 		case tcell.KeyCtrlB:
 			Bookmarks()
-			addToHist("about:bookmarks")
+			tabs[curTab].addToHistory("about:bookmarks")
 			return nil
 		case tcell.KeyCtrlD:
 			go addBookmark()
 			return nil
 		case tcell.KeyPgUp:
-			pageUp()
+			tabs[curTab].pageUp()
 			return nil
 		case tcell.KeyPgDn:
-			pageDown()
+			tabs[curTab].pageDown()
 			return nil
 		case tcell.KeyRune:
 			// Regular key was sent
@@ -285,6 +282,7 @@ func Init() {
 				// Space starts typing, like Bombadillo
 				bottomBar.SetLabel("[::b]URL/Num./Search: [::-]")
 				bottomBar.SetText("")
+				// Don't save bottom bar, so that whenever you switch tabs, it's not in that mode
 				App.SetFocus(bottomBar)
 				return nil
 			case "q":
@@ -303,10 +301,10 @@ func Init() {
 				Help()
 				return nil
 			case "u":
-				pageUp()
+				tabs[curTab].pageUp()
 				return nil
 			case "d":
-				pageDown()
+				tabs[curTab].pageDown()
 				return nil
 
 			// Shift+NUMBER keys, for switching to a specific tab
@@ -355,87 +353,31 @@ func Stop() {
 // NewTab opens a new tab and switches to it, displaying the
 // the default empty content because there's no URL.
 func NewTab() {
-	// Create TextView in tabViews and change curTab
-	// Set the textView options, and the changed func to App.Draw()
+	// Create TextView and change curTab
+	// Set the TextView options, and the changed func to App.Draw()
 	// SetDoneFunc to do link highlighting
 	// Add view to pages and switch to it
 
-	// But first, turn off link selecting mode in the current tab
+	// Process current tab before making a new one
 	if curTab > -1 {
-		tabViews[curTab].Highlight("")
+		// Turn off link selecting mode in the current tab
+		tabs[curTab].view.Highlight("")
+		// Save bottomBar state
+		tabs[curTab].saveBottomBar()
 	}
-	selectedLink = ""
 
 	curTab = NumTabs()
 	reformatPage(newTabPage)
-	tabMap[curTab] = newTabPage
-	reformatMuts[curTab] = &sync.Mutex{}
-	tabViews[curTab] = cview.NewTextView().
-		SetDynamicColors(true).
-		SetRegions(true).
-		SetScrollable(true).
-		SetWrap(false).
-		SetText(tabMap[curTab].Content).
-		ScrollToBeginning().
-		SetChangedFunc(func() {
-			App.Draw()
-		}).
-		SetDoneFunc(func(key tcell.Key) {
-			// Altered from: https://gitlab.com/tslocum/cview/-/blob/master/demos/textview/main.go
-			// Handles being able to select and "click" links with the enter and tab keys
 
-			if key == tcell.KeyEsc {
-				// Stop highlighting
-				tabViews[curTab].Highlight("")
-				bottomBar.SetLabel("")
-				bottomBar.SetText(tabMap[curTab].Url)
-				selectedLink = ""
-			}
+	tabs[curTab] = makeNewTab()
+	tabs[curTab].page = newTabPage
 
-			currentSelection := tabViews[curTab].GetHighlights()
-			numSelections := len(tabMap[curTab].Links)
-
-			if key == tcell.KeyEnter {
-				if len(currentSelection) > 0 && len(tabMap[curTab].Links) > 0 {
-					// A link was selected, "click" it and load the page it's for
-					bottomBar.SetLabel("")
-					selectedLink = ""
-					linkN, _ := strconv.Atoi(currentSelection[0])
-					followLink(tabMap[curTab].Url, tabMap[curTab].Links[linkN])
-					return
-				} else {
-					tabViews[curTab].Highlight("0").ScrollToHighlight()
-					// Display link URL in bottomBar
-					bottomBar.SetLabel("[::b]Link: [::-]")
-					bottomBar.SetText(tabMap[curTab].Links[0])
-					selectedLink = tabMap[curTab].Links[0]
-				}
-			} else if len(currentSelection) > 0 {
-				// There's still a selection, but a different key was pressed, not Enter
-
-				index, _ := strconv.Atoi(currentSelection[0])
-				if key == tcell.KeyTab {
-					index = (index + 1) % numSelections
-				} else if key == tcell.KeyBacktab {
-					index = (index - 1 + numSelections) % numSelections
-				} else {
-					return
-				}
-				tabViews[curTab].Highlight(strconv.Itoa(index)).ScrollToHighlight()
-				// Display link URL in bottomBar
-				bottomBar.SetLabel("[::b]Link: [::-]")
-				bottomBar.SetText(tabMap[curTab].Links[index])
-				selectedLink = tabMap[curTab].Links[index]
-			}
-		})
-
-	tabHist[curTab] = []string{}
 	// Can't go backwards, but this isn't the first page either.
 	// The first page will be the next one the user goes to.
-	tabHistPos[curTab] = -1
+	tabs[curTab].history.pos = -1
 
-	tabPages.AddAndSwitchToPage(strconv.Itoa(curTab), tabViews[curTab], true)
-	App.SetFocus(tabViews[curTab])
+	tabPages.AddAndSwitchToPage(strconv.Itoa(curTab), tabs[curTab].view, true)
+	App.SetFocus(tabs[curTab].view)
 
 	// Add tab number to the actual place where tabs are show on the screen
 	// Tab regions are 0-indexed but text displayed on the screen starts at 1
@@ -448,6 +390,7 @@ func NewTab() {
 
 	bottomBar.SetLabel("")
 	bottomBar.SetText("")
+	tabs[curTab].saveBottomBar()
 
 	// Draw just in case
 	App.Draw()
@@ -470,13 +413,8 @@ func CloseTab() {
 		return
 	}
 
-	delete(tabMap, curTab)
+	tabs = tabs[:len(tabs)-1]
 	tabPages.RemovePage(strconv.Itoa(curTab))
-	delete(tabViews, curTab)
-	delete(reformatMuts, curTab)
-
-	delete(tabHist, curTab)
-	delete(tabHistPos, curTab)
 
 	if curTab <= 0 {
 		curTab = NumTabs() - 1
@@ -498,8 +436,8 @@ func CloseTab() {
 	}
 	tabRow.Highlight(strconv.Itoa(curTab)).ScrollToHighlight()
 
-	bottomBar.SetLabel("")
-	bottomBar.SetText(tabMap[curTab].Url)
+	// Set previous tab's bottomBar state
+	tabs[curTab].applyBottomBar()
 
 	// Just in case
 	App.Draw()
@@ -516,25 +454,37 @@ func SwitchTab(tab int) {
 		tab = NumTabs() - 1
 	}
 
+	// Save current tab attributes
+	if curTab > -1 {
+		// Save bottomBar state
+		tabs[curTab].saveBottomBar()
+	}
+
 	curTab = tab % NumTabs()
-	reformatPageAndSetView(curTab, tabMap[curTab])
+
+	// Display tab
+	reformatPageAndSetView(curTab, tabs[curTab].page)
 	tabPages.SwitchToPage(strconv.Itoa(curTab))
 	tabRow.Highlight(strconv.Itoa(curTab)).ScrollToHighlight()
-
-	bottomBar.SetLabel("")
-	bottomBar.SetText(tabMap[curTab].Url)
+	tabs[curTab].applyBottomBar()
 
 	// Just in case
 	App.Draw()
 }
 
 func Reload() {
-	if !tabHasContent() {
+	if !tabs[curTab].hasContent() {
 		return
 	}
 
-	cache.Remove(tabMap[curTab].Url)
-	go handleURL(tabMap[curTab].Url)
+	cache.Remove(tabs[curTab].page.Url)
+	go func(tab int) {
+		handleURL(tab, tabs[tab].page.Url) // goURL is not used bc history shouldn't be added to
+		if tab == curTab {
+			// Display the bottomBar state that handleURL set
+			tabs[tab].applyBottomBar()
+		}
+	}(curTab)
 }
 
 // URL loads and handles the provided URL for the current tab.
@@ -544,11 +494,11 @@ func URL(u string) {
 
 	if u == "about:bookmarks" {
 		Bookmarks()
-		addToHist("about:bookmarks")
+		tabs[curTab].addToHistory("about:bookmarks")
 		return
 	}
 	if u == "about:newtab" {
-		setPage(newTabPage)
+		setPage(curTab, newTabPage)
 		return
 	}
 	if strings.HasPrefix(u, "about:") {
@@ -556,14 +506,9 @@ func URL(u string) {
 		return
 	}
 
-	go func() {
-		final, displayed := handleURL(u)
-		if displayed {
-			addToHist(final)
-		}
-	}()
+	go goURL(curTab, u)
 }
 
 func NumTabs() int {
-	return len(tabViews)
+	return len(tabs)
 }

display/history.go

@@ -1,44 +1,33 @@
 package display
 
-// Tab number mapped to list of URLs ordered from first to most recent.
-var tabHist = make(map[int][]string)
-
-// Tab number mapped to where in its history you are.
-// The value is a valid index of the string slice above.
-var tabHistPos = make(map[int]int)
-
-// addToHist adds the given URL to history.
-// It assumes the URL is currently being loaded and displayed on the page.
-func addToHist(u string) {
-	if tabHistPos[curTab] < len(tabHist[curTab])-1 {
-		// We're somewhere in the middle of the history instead, with URLs ahead and behind.
-		// The URLs ahead need to be removed so this new URL is the most recent item in the history
-		tabHist[curTab] = tabHist[curTab][:tabHistPos[curTab]+1]
-	}
-	tabHist[curTab] = append(tabHist[curTab], u)
-	tabHistPos[curTab]++
-}
-
 func histForward() {
-	if tabHistPos[curTab] >= len(tabHist[curTab])-1 {
+	if tabs[curTab].history.pos >= len(tabs[curTab].history.urls)-1 {
 		// Already on the most recent URL in the history
 		return
 	}
-	tabHistPos[curTab]++
-	go func() {
-		handleURL(tabHist[curTab][tabHistPos[curTab]])
-		applyScroll()
-	}()
+	tabs[curTab].history.pos++
+	go func(tab int) {
+		handleURL(tab, tabs[tab].history.urls[tabs[tab].history.pos]) // Load that position in history
+		tabs[tab].applyScroll()
+		if tab == curTab {
+			// Display the bottomBar state that handleURL set
+			tabs[tab].applyBottomBar()
+		}
+	}(curTab)
 }
 
 func histBack() {
-	if tabHistPos[curTab] <= 0 {
+	if tabs[curTab].history.pos <= 0 {
 		// First tab in history
 		return
 	}
-	tabHistPos[curTab]--
-	go func() {
-		handleURL(tabHist[curTab][tabHistPos[curTab]])
-		applyScroll()
-	}()
+	tabs[curTab].history.pos--
+	go func(tab int) {
+		handleURL(tab, tabs[tab].history.urls[tabs[tab].history.pos]) // Load that position in history
+		tabs[tab].applyScroll()
+		if tab == curTab {
+			// Display the bottomBar state that handleURL set
+			tabs[tab].applyBottomBar()
+		}
+	}(curTab)
 }

display/private.go

@@ -18,18 +18,6 @@ import (
 
 // This file contains the functions that aren't part of the public API.
 
-// pageUp scrolls up 75% of the height of the terminal, like Bombadillo.
-func pageUp() {
-	row, col := tabViews[curTab].GetScrollOffset()
-	tabViews[curTab].ScrollTo(row-(termH/4)*3, col)
-}
-
-// pageDown scrolls down 75% of the height of the terminal, like Bombadillo.
-func pageDown() {
-	row, col := tabViews[curTab].GetScrollOffset()
-	tabViews[curTab].ScrollTo(row+(termH/4)*3, col)
-}
-
 func leftMargin() int {
 	return int(float64(termW) * viper.GetFloat64("a-general.left_margin"))
 }
@@ -60,50 +48,11 @@ func queryEscape(path string) string {
 	return strings.ReplaceAll(url.PathEscape(path), "+", "%2B")
 }
 
-// tabHasContent returns true when the current tab has a page being displayed.
-// The most likely situation where false would be returned is when the default
-// new tab content is being displayed.
-func tabHasContent() bool {
-	if curTab < 0 {
-		return false
-	}
-	if len(tabViews) < curTab {
-		// There isn't a TextView for the current tab number
-		return false
-	}
-	if tabMap[curTab].Url == "" {
-		// Likely the default content page
-		return false
-	}
-	if strings.HasPrefix(tabMap[curTab].Url, "about:") {
-		return false
-	}
-
-	_, ok := tabMap[curTab]
-	return ok // If there's a page, return true
-}
-
-// saveScroll saves where in the page the user was.
-// It should be used whenever moving from one page to another.
-func saveScroll() {
-	// It will also be saved in the cache because the cache uses the same pointer
-	row, col := tabViews[curTab].GetScrollOffset()
-	tabMap[curTab].Row = row
-	tabMap[curTab].Column = col
-}
-
-// applyScroll applies the saved scroll values to the current page and tab.
-// It should only be used when going backward and forward, not when
-// loading a new page (that might have scroll vals cached anyway).
-func applyScroll() {
-	tabViews[curTab].ScrollTo(tabMap[curTab].Row, tabMap[curTab].Column)
-}
-
 // resolveRelLink returns an absolute link for the given absolute link and relative one.
 // It also returns an error if it could not resolve the links, which should be displayed
 // to the user.
-func resolveRelLink(prev, next string) (string, error) {
-	if !tabHasContent() {
+func resolveRelLink(tab int, prev, next string) (string, error) {
+	if !tabs[tab].hasContent() {
 		return next, nil
 	}
 
@@ -117,12 +66,13 @@ func resolveRelLink(prev, next string) (string, error) {
 
 // followLink should be used when the user "clicks" a link on a page.
 // Not when a URL is opened on a new tab for the first time.
-func followLink(prev, next string) {
+// It will handle setting the bottomBar.
+func followLink(tab int, prev, next string) {
 
 	// Copied from URL()
 	if next == "about:bookmarks" {
 		Bookmarks()
-		addToHist("about:bookmarks")
+		tabs[tab].addToHistory("about:bookmarks")
 		return
 	}
 	if strings.HasPrefix(next, "about:") {
@@ -130,19 +80,14 @@ func followLink(prev, next string) {
 		return
 	}
 
-	if tabHasContent() {
-		saveScroll() // Likely called later on, it's here just in case
-		nextURL, err := resolveRelLink(prev, next)
+	if tabs[tab].hasContent() {
+		tabs[tab].saveScroll() // Likely called later on, it's here just in case
+		nextURL, err := resolveRelLink(tab, prev, next)
 		if err != nil {
 			Error("URL Error", err.Error())
 			return
 		}
-		go func() {
-			final, displayed := handleURL(nextURL)
-			if displayed {
-				addToHist(final)
-			}
-		}()
+		go goURL(tab, nextURL)
 		return
 	}
 	// No content on current tab, so the "prev" URL is not valid.
@@ -152,12 +97,7 @@ func followLink(prev, next string) {
 		Error("URL Error", "Link URL could not be parsed")
 		return
 	}
-	go func() {
-		final, displayed := handleURL(next)
-		if displayed {
-			addToHist(final)
-		}
-	}()
+	go goURL(tab, next)
 }
 
 // reformatPage will take the raw page content and reformat it according to the current terminal dimensions.
@@ -187,29 +127,48 @@ func reformatPage(p *structs.Page) {
 // reformatPageAndSetView is for reformatting a page that is already being displayed.
 // setPage should be used when a page is being loaded for the first time.
 func reformatPageAndSetView(tab int, p *structs.Page) {
-	saveScroll()
+	tabs[tab].saveScroll()
 	reformatPage(p)
-	tabViews[tab].SetText(p.Content)
-	applyScroll() // Go back to where you were, roughly
+	tabs[tab].view.SetText(p.Content)
+	tabs[tab].applyScroll() // Go back to where you were, roughly
 }
 
-// setPage displays a Page on the current tab.
-func setPage(p *structs.Page) {
-	saveScroll() // Save the scroll of the previous page
+// setPage displays a Page on the passed tab number.
+// The bottomBar is not actually changed in this func
+func setPage(tab int, p *structs.Page) {
+	tabs[tab].saveScroll() // Save the scroll of the previous page
 
 	// Make sure the page content is fitted to the terminal every time it's displayed
 	reformatPage(p)
 
 	// Change page on screen
-	tabMap[curTab] = p
-	tabViews[curTab].SetText(p.Content)
-	tabViews[curTab].Highlight("") // Turn off highlights
-	tabViews[curTab].ScrollToBeginning()
+	tabs[tab].page = p
+	tabs[tab].view.SetText(p.Content)
+	tabs[tab].view.Highlight("") // Turn off highlights
+	tabs[tab].view.ScrollToBeginning()
 
 	// Setup display
-	App.SetFocus(tabViews[curTab])
-	bottomBar.SetLabel("")
-	bottomBar.SetText(p.Url)
+	App.SetFocus(tabs[tab].view)
+
+	// Save bottom bar for the tab - TODO: other funcs will apply/display it
+	tabs[tab].barLabel = ""
+	tabs[tab].barText = p.Url
+}
+
+// goURL is like handleURL, but takes care of history and the bottomBar.
+// It should be preferred over handleURL in most cases.
+// It has no return values to be processed.
+//
+// It should be called in a goroutine.
+func goURL(tab int, u string) {
+	final, displayed := handleURL(tab, u)
+	if displayed {
+		tabs[tab].addToHistory(final)
+	}
+	if tab == curTab {
+		// Display the bottomBar state that handleURL set
+		tabs[tab].applyBottomBar()
+	}
 }
 
 // handleURL displays whatever action is needed for the provided URL,
@@ -222,13 +181,12 @@ func setPage(p *structs.Page) {
 // The second returned item is a bool indicating if page content was displayed.
 // It returns false for Errors, other protocols, etc.
 //
-// TODO: Add tab number param - now the func only saves the values like the content
-// and bottom bar.
-// TODO: Some other func that constantly updates bottom bar values
-func handleURL(u string) (string, bool) {
+// The bottomBar is not actually changed in this func, except during loading.
+// The func that calls this one should apply the bottomBar values if necessary.
+func handleURL(tab int, u string) (string, bool) {
 	defer App.Draw() // Just in case
 
-	App.SetFocus(tabViews[curTab])
+	App.SetFocus(tabs[tab].view)
 
 	// To allow linking to the bookmarks page, and history browsing
 	if u == "about:bookmarks" {
@@ -241,7 +199,7 @@ func handleURL(u string) (string, bool) {
 	parsed, err := url.Parse(u)
 	if err != nil {
 		Error("URL Error", err.Error())
-		bottomBar.SetText(tabMap[curTab].Url)
+		tabs[tab].barText = tabs[tab].page.Url
 		return "", false
 	}
 
@@ -264,12 +222,12 @@ func handleURL(u string) (string, bool) {
 				Error("HTTP Error", "Error executing custom browser command: "+err.Error())
 			}
 		}
-		bottomBar.SetText(tabMap[curTab].Url)
+		tabs[tab].barText = tabs[tab].page.Url
 		return "", false
 	}
 	if !strings.HasPrefix(u, "gemini") {
 		Error("Protocol Error", "Only gemini and HTTP are supported. URL was "+u)
-		bottomBar.SetText(tabMap[curTab].Url)
+		tabs[tab].barText = tabs[tab].page.Url
 		return "", false
 	}
 	// Gemini URL
@@ -277,11 +235,12 @@ func handleURL(u string) (string, bool) {
 	// Load page from cache if possible
 	page, ok := cache.Get(u)
 	if ok {
-		setPage(page)
+		setPage(tab, page)
 		return u, true
 	}
 	// Otherwise download it
 	bottomBar.SetText("Loading...")
+	tabs[tab].barText = "Loading..." // Save it too, in case the tab switches during loading
 	App.Draw()
 
 	res, err := client.Fetch(u)
@@ -293,13 +252,13 @@ func handleURL(u string) (string, bool) {
 		} else {
 			// They don't want to continue
 			// Set the bar back to original URL
-			bottomBar.SetText(tabMap[curTab].Url)
+			tabs[tab].barText = tabs[tab].page.Url
 			return "", false
 		}
 	} else if err != nil {
 		Error("URL Fetch Error", err.Error())
 		// Set the bar back to original URL
-		bottomBar.SetText(tabMap[curTab].Url)
+		tabs[tab].barText = tabs[tab].page.Url
 		return "", false
 	}
 	if renderer.CanDisplay(res) {
@@ -308,18 +267,19 @@ func handleURL(u string) (string, bool) {
 		if err != nil {
 			Error("Page Error", "Issuing creating page: "+err.Error())
 			// Set the bar back to original URL
-			bottomBar.SetText(tabMap[curTab].Url)
+			tabs[tab].barText = tabs[tab].page.Url
 			return "", false
 		}
 		cache.Add(page)
-		setPage(page)
+		setPage(tab, page)
 		return u, true
 	}
 	// Not displayable
 	// Could be a non 20 (or 21) status code, or a different kind of document
 
 	// Set the bar back to original URL
-	bottomBar.SetText(tabMap[curTab].Url)
+	bottomBar.SetText(tabs[curTab].page.Url)
+	tabs[tab].barText = tabs[curTab].page.Url
 	App.Draw()
 
 	// Handle each status code
@@ -335,7 +295,7 @@ func handleURL(u string) (string, bool) {
 				Error("Input Error", "URL for that input would be too long.")
 				return "", false
 			}
-			return handleURL(parsed.String())
+			return handleURL(tab, parsed.String())
 		}
 		return "", false
 	case 30:
@@ -345,13 +305,12 @@ func handleURL(u string) (string, bool) {
 			return "", false
 		}
 		redir := parsed.ResolveReference(parsedMeta).String()
-
 		if YesNo("Follow redirect?\n" + redir) {
-			return handleURL(redir)
+			return handleURL(tab, redir)
 		}
 		return "", false
 	case 40:
-		Error("Temporary Failure", cview.Escape(res.Meta)) // Escaped just in case, to not allow malicious meta strings
+		Error("Temporary Failure", cview.Escape(res.Meta))
 		return "", false
 	case 50:
 		Error("Permanent Failure", cview.Escape(res.Meta))

display/tab.go

@@ -1,9 +1,11 @@
 package display
 
 import (
+	"strconv"
 	"strings"
 	"sync"
 
+	"github.com/gdamore/tcell"
 	"github.com/makeworld-the-better-one/amfora/structs"
 	"gitlab.com/tslocum/cview"
 )
@@ -29,13 +31,14 @@ type tab struct {
 	history     *tabHistory
 	reformatMut *sync.Mutex // Mutex for reformatting, so there's only one reformat job at once
 	selected    string      // The current text or link selected
+	selectedID  string      // The cview region ID for the selected text/link
 	barLabel    string      // The bottomBar label for the tab
 	barText     string      // The bottomBar text for the tab
 }
 
 // makeNewTab initializes an tab struct with no content.
 func makeNewTab() *tab {
-	return &tab{
+	t := tab{
 		page: &structs.Page{},
 		view: cview.NewTextView().
 			SetDynamicColors(true).
@@ -46,8 +49,65 @@ func makeNewTab() *tab {
 				App.Draw()
 			}),
 		mode:        modeOff,
+		history:     &tabHistory{},
 		reformatMut: &sync.Mutex{},
 	}
+	t.view.SetDoneFunc(func(key tcell.Key) {
+		// Altered from: https://gitlab.com/tslocum/cview/-/blob/master/demos/textview/main.go
+		// Handles being able to select and "click" links with the enter and tab keys
+
+		tab := curTab // Don't let it change in the middle of the code
+
+		defer tabs[tab].saveBottomBar()
+
+		if key == tcell.KeyEsc {
+			// Stop highlighting
+			tabs[tab].view.Highlight("")
+			bottomBar.SetLabel("")
+			bottomBar.SetText(tabs[tab].page.Url)
+			tabs[tab].mode = modeOff
+		}
+
+		currentSelection := tabs[tab].view.GetHighlights()
+		numSelections := len(tabs[tab].page.Links)
+
+		if key == tcell.KeyEnter {
+			if len(currentSelection) > 0 && len(tabs[tab].page.Links) > 0 {
+				// A link was selected, "click" it and load the page it's for
+				bottomBar.SetLabel("")
+				tabs[tab].mode = modeOff
+				linkN, _ := strconv.Atoi(currentSelection[0])
+				followLink(tab, tabs[tab].page.Url, tabs[tab].page.Links[linkN])
+				return
+			} else {
+				tabs[tab].view.Highlight("0").ScrollToHighlight()
+				// Display link URL in bottomBar
+				bottomBar.SetLabel("[::b]Link: [::-]")
+				bottomBar.SetText(tabs[tab].page.Links[0])
+				tabs[tab].selected = tabs[tab].page.Links[0]
+				tabs[tab].selectedID = "0"
+			}
+		} else if len(currentSelection) > 0 {
+			// There's still a selection, but a different key was pressed, not Enter
+
+			index, _ := strconv.Atoi(currentSelection[0])
+			if key == tcell.KeyTab {
+				index = (index + 1) % numSelections
+			} else if key == tcell.KeyBacktab {
+				index = (index - 1 + numSelections) % numSelections
+			} else {
+				return
+			}
+			tabs[tab].view.Highlight(strconv.Itoa(index)).ScrollToHighlight()
+			// Display link URL in bottomBar
+			bottomBar.SetLabel("[::b]Link: [::-]")
+			bottomBar.SetText(tabs[tab].page.Links[index])
+			tabs[tab].selected = tabs[tab].page.Links[index]
+			tabs[tab].selectedID = currentSelection[0]
+		}
+	})
+
+	return &t
 }
 
 // addToHistory adds the given URL to history.