From 5955177386c670145853da08c907a1bcc53c0037 Mon Sep 17 00:00:00 2001
From: Taras Bunyk <tbunyk@gmail.com>
Date: Mon, 8 Mar 2021 21:44:02 +0100
Subject: [PATCH] Add position from which file is loaded to progress
 computation

---
 app/app.go       |  7 +++++--
 cmd/text.go      |  3 ++-
 phrase/phrase.go | 14 ++++++++------
 view/render.go   |  3 ++-
 4 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/app/app.go b/app/app.go
index e3e8233..c2a8f01 100644
--- a/app/app.go
+++ b/app/app.go
@@ -20,8 +20,10 @@ type App struct {
 	InputPosition int
 	ErrorInput    []rune
 	StartedAt     time.Time
-	Zen           bool
-	Mute          bool
+	Offset        int
+
+	Zen  bool
+	Mute bool
 
 	scr tcell.Screen
 }
@@ -95,6 +97,7 @@ func (a App) ToDisplay() view.DisplayableData {
 		TODOText:  a.Text[a.InputPosition:],
 		StartedAt: a.StartedAt,
 		Zen:       a.Zen,
+		Offset:    a.Offset,
 	}
 }
 
diff --git a/cmd/text.go b/cmd/text.go
index 8d5a411..9c5796a 100644
--- a/cmd/text.go
+++ b/cmd/text.go
@@ -13,13 +13,14 @@ var textCmd = &cobra.Command{
 	Short:   "train to type contents of some file",
 	Args:    cobra.ExactArgs(1),
 	Run: func(cmd *cobra.Command, args []string) {
-		text, err := phrase.FromFile(args[0], offset, limit)
+		text, skipped, err := phrase.FromFile(args[0], offset, limit)
 		fatal(err)
 
 		a, err := app.New(text)
 		fatal(err)
 		a.Zen = zen
 		a.Mute = mute
+		a.Offset = skipped
 
 		a.Run()
 		fatal(err)
diff --git a/phrase/phrase.go b/phrase/phrase.go
index 2886749..0b5c36f 100644
--- a/phrase/phrase.go
+++ b/phrase/phrase.go
@@ -11,21 +11,22 @@ import (
 	"path/filepath"
 	"strings"
 	"time"
+	"unicode/utf8"
 
 	"github.com/bunyk/gokeybr/fs"
 )
 
-func FromFile(filename string, offset, minLength int) (string, error) {
-	items, err := readFileLines(filename, offset)
+func FromFile(filename string, offset, minLength int) (string, int, error) {
+	items, skipped, err := readFileLines(filename, offset)
 	if err != nil {
-		return "", err
+		return "", skipped, err
 	}
 	items = slice(items, minLength)
-	return strings.Join(items, "\n"), nil
+	return strings.Join(items, "\n"), skipped, nil
 }
 
 func Words(filename string, n int) (string, error) {
-	words, err := readFileLines(filename, 0)
+	words, _, err := readFileLines(filename, 0)
 	if err != nil {
 		return "", err
 	}
@@ -38,7 +39,7 @@ func Words(filename string, n int) (string, error) {
 	return strings.Join(phrase, " "), nil
 }
 
-func readFileLines(filename string, offset int) (lines []string, err error) {
+func readFileLines(filename string, offset int) (lines []string, skipped int, err error) {
 	var data []byte
 	if filename == "-" {
 		data, err = ioutil.ReadAll(os.Stdin)
@@ -69,6 +70,7 @@ func readFileLines(filename string, offset int) (lines []string, err error) {
 		}
 		if skip > 0 {
 			skip--
+			skipped += utf8.RuneCountInString(line) + 1
 		} else {
 			lines = append(lines, line[:len(line)-1])
 		}
diff --git a/view/render.go b/view/render.go
index 7bdd15e..9e05754 100644
--- a/view/render.go
+++ b/view/render.go
@@ -25,6 +25,7 @@ type DisplayableData struct {
 	TODOText  []rune
 	StartedAt time.Time
 	Zen       bool
+	Offset    int
 }
 
 func Render(s tcell.Screen, dd DisplayableData) {
@@ -39,7 +40,7 @@ func Render(s tcell.Screen, dd DisplayableData) {
 		// Stats:
 		seconds := 0.0
 		wpm := 0.0
-		done := float64(len(dd.DoneText))
+		done := float64(len(dd.DoneText) + dd.Offset)
 		if !dd.StartedAt.IsZero() {
 			seconds = time.Since(dd.StartedAt).Seconds()
 			wpm = wordsPerChar * done / seconds * 60.0