From 7d4cc9f7dd297c08e02447dda1f8aad9db0b0768 Mon Sep 17 00:00:00 2001
From: Nick White <git@njw.name>
Date: Tue, 26 Mar 2019 15:21:43 +0000
Subject: Better error handling with hocr lines

---
 lib/hocr/lines.go | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

(limited to 'lib')

diff --git a/lib/hocr/lines.go b/lib/hocr/lines.go
index c60a619..20c6550 100644
--- a/lib/hocr/lines.go
+++ b/lib/hocr/lines.go
@@ -7,6 +7,7 @@ import (
 	"image"
 	"image/png"
 	"io/ioutil"
+	"log"
 	"os"
 	"path/filepath"
 	"strings"
@@ -72,9 +73,11 @@ func parseLineDetails(h Hocr, i image.Image, name string) (line.Details, error)
 		ln.Avgconf = (totalconf / float64(num)) / 100
 		ln.Text = getLineText(l)
 		ln.OcrName = name
-		var imgd line.ImgDirect
-		imgd.Img = i.(*image.Gray).SubImage(image.Rect(coords[0], coords[1], coords[2], coords[3]))
-		ln.Img = imgd
+		if i != nil {
+			var imgd line.ImgDirect
+			imgd.Img = i.(*image.Gray).SubImage(image.Rect(coords[0], coords[1], coords[2], coords[3]))
+			ln.Img = imgd
+		}
 		lines = append(lines, ln)
 	}
 	return lines, nil
@@ -93,15 +96,17 @@ func GetLineDetails(hocrfn string) (line.Details, error) {
 		return newlines, err
 	}
 
+	var img image.Image
 	pngfn := strings.Replace(hocrfn, ".hocr", ".png", 1)
 	pngf, err := os.Open(pngfn)
 	if err != nil {
-		return newlines, err
-	}
-	defer pngf.Close()
-	img, err := png.Decode(pngf)
-	if err != nil {
-		return newlines, err
+		log.Println("Warning: can't open image %s\n", pngfn)
+	} else {
+		defer pngf.Close()
+		img, err = png.Decode(pngf)
+		if err != nil {
+			log.Println("Warning: can't load image %s\n", pngfn)
+		}
 	}
 
 	n := strings.Replace(filepath.Base(hocrfn), ".hocr", "", 1)
-- 
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