From 800db2616edfeb22aabe4aca44b220b3d06690d5 Mon Sep 17 00:00:00 2001
From: Martin Dosch <spam-debian-salsa@mdosch.de>
Date: Fri, 31 May 2019 09:50:46 +0200
Subject: [PATCH] Added filter option.

---
 feed-to-muc.go |  3 ++-
 getarticles.go | 44 +++++++++++++++++++++++++++++++++++---------
 2 files changed, 37 insertions(+), 10 deletions(-)

diff --git a/feed-to-muc.go b/feed-to-muc.go
index 611763a..b0a5a6b 100644
--- a/feed-to-muc.go
+++ b/feed-to-muc.go
@@ -38,6 +38,7 @@ func main() {
 		MaxArticles   int
 		RefreshTime   time.Duration
 		NoExcerpt     bool
+		Filter        []string
 		Feeds         []string
 	}
 
@@ -149,7 +150,7 @@ func main() {
 		// Check all configured feeds for new articles and send
 		// new articles to configured MUC.
 		for i := 0; i < len(config.Feeds); i++ {
-			output, err := getArticles(config.Feeds[i], config.MaxArticles, config.NoExcerpt)
+			output, err := getArticles(config.Feeds[i], config.MaxArticles, config.NoExcerpt, config.Filter)
 			if err != nil {
 				// Exit if an error occurs checking the feeds.
 				log.Fatal("Error: Can't check feeds for new articles: ", err)
diff --git a/getarticles.go b/getarticles.go
index 7b089da..e740ab3 100644
--- a/getarticles.go
+++ b/getarticles.go
@@ -18,7 +18,7 @@ import (
 )
 
 // Get new articles for specified feed.
-func getArticles(feedURL string, max int, noExcerpt bool) (string, error) {
+func getArticles(feedURL string, max int, noExcerpt bool, filter []string) (string, error) {
 
 	type feedCache struct {
 		LastChange string
@@ -224,19 +224,45 @@ func getArticles(feedURL string, max int, noExcerpt bool) (string, error) {
 			// Remove lines only consisting of "> "; thank you reddit.
 			description = strings.Replace(description, "> \n", "", -1)
 
-			// To make the message look not so bloated we remove double newlines.
-			// Split the article description/content into fragments between double newlines.
-			fragments := strings.Split(description, "\n\n")
-			// Empty article description/content
+			// Split article description/content in single lines.
+			lines := strings.Split(description, "\n")
+			// Empty article description/content.
 			description = ""
-			// Fill article description/content with the fragments separated by one newline.
-			for _, line := range fragments {
-				// Only if the only content is not empty.
+			// Get amount of lines in description/content.
+			descriptionLength := len(lines)
+			for i, line := range lines {
+				// Remove empty lines to safe space.
 				if line != "" {
-					description = description + line + "\n"
+					// Remove lines starting with one of the defined filters.
+					filterStrike := false
+					for _, filterString := range filter {
+						if strings.HasPrefix(line, filterString) == true {
+							filterStrike = true
+						}
+					}
+					if filterStrike == false {
+						description = description + line
+						// Add new line, except for the last line.
+						if i < descriptionLength-1 {
+							description = description + "\n"
+						}
+					}
 				}
 			}
 
+			// To make the message look not so bloated we remove double newlines.
+			// Split the article description/content into fragments between double newlines.
+			//	fragments := strings.Split(description, "\n\n")
+			// Empty article description/content
+			//	description = ""
+			// Fill article description/content with the fragments separated by one newline.
+			//	for _, line := range fragments {
+			// Only if the only content is not empty.
+			//	if line != "" {
+			//		description = description + line + "\n"
+			//	}
+			//}
+
 			// Only append article link if it is not yet contained in description (e.g. read more: URL).
 			if strings.Contains(description, article.Link) == true {
 				// Replace article link with URL cleaned from redirects and trackers.