rewording and actually add filter code

2 files changed, 6 insertions, 1 deletions

diff --git a/README.md b/README.md
index 34a1675..8fb50cb 100644
--- a/README.md
+++ b/README.md
@@ -103,7 +103,7 @@ It is up to you to set up a Gemini server for the Gemtext, a Webserver for the H
 
 ## Content filter
 
-Once your capsule reaches a certain size it can become anoying to re-generate everything if you only want to modify one single Gemtext file. The following will add a filter to only generate the files matching a regular expression:
+Once your capsule reaches a certain size it can become anoying to re-generate everything if you only want to preview one single content file. The following will add a filter to only generate the files matching a regular expression:
 
 ```
 ./gemtexter --generate '.*hello.*'
diff --git a/lib/generate.source.sh b/lib/generate.source.sh
index b2dafbc..f72f84b 100644
--- a/lib/generate.source.sh
+++ b/lib/generate.source.sh
@@ -124,6 +124,11 @@ generate::fromgmi () {
 
     # Add content
     while read -r src; do
+        # User can specify a content filter
+        if test ! -z "$CONTENT_FILTER" && ! $GREP -q "$CONTENT_FILTER" <<< "$src"; then
+            continue
+        fi
+
         num_gmi_files=$(( num_gmi_files + 1 ))
         log INFO "Generating output formats from $src"
         for format in "$@"; do