From 2a3fa5b8c749e631d2d7ed1bb01300f023c4b9ea Mon Sep 17 00:00:00 2001
From: Paul Buetow <git@mx.buetow.org>
Date: Tue, 25 May 2021 22:10:09 +0100
Subject: rename packages to lib

---
 lib/atomfeed.source.sh | 128 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 lib/atomfeed.source.sh

(limited to 'lib/atomfeed.source.sh')

diff --git a/lib/atomfeed.source.sh b/lib/atomfeed.source.sh
new file mode 100644
index 0000000..e1ee406
--- /dev/null
+++ b/lib/atomfeed.source.sh
@@ -0,0 +1,128 @@
+# Retrieve meta data of a given blog post. Generate new meta info if not yet exists.
+atomfeed::meta () {
+    local -r gmi_file_path="$1"; shift
+    local -r meta_file=$($SED 's|gemtext|meta|; s|.gmi$|.meta|;' <<< "$gmi_file_path")
+
+    log VERBOSE "Generating meta info for post $gmi_file_path"
+
+    local is_draft=no
+    if $GREP -E -q '\.draft\.meta$' <<< "$meta_file"; then
+        is_draft=yes
+    fi
+
+    local -r meta_dir=$(dirname "$meta_file")
+    if [[ ! -d "$meta_dir" ]]; then
+        mkdir -p "$meta_dir"
+    fi
+
+    if [ ! -f "$meta_file" ]; then
+        # Extract first heading as post title.
+        local title=$($SED -n '/^# / { s/# //; p; q; }' "$gmi_file_path" | tr '"' "'")
+        # Extract first paragraph from Gemtext
+        local summary=$($SED -n '/^[A-Z]/ { p; q; }' "$gmi_file_path" | tr '"' "'")
+        # Extract the date from the file name.
+        local filename_date=$(basename "$gmi_file_path" | cut -d- -f1,2,3)
+        local date=$($DATE --iso-8601=seconds --date "$filename_date $($DATE +%H:%M:%S)")
+
+        cat <<META | tee "$meta_file"
+local meta_date="$date"
+local meta_author="$AUTHOR"
+local meta_email="$EMAIL"
+local meta_title="$title"
+local meta_summary="$summary. .....to read on please visit my site."
+META
+        if [[ $is_draft == no ]]; then
+            git::add meta "$meta_file"
+        fi
+        return
+    fi
+
+    cat "$meta_file"
+    if [[ $is_draft == yes ]]; then
+        rm "$meta_file"
+    fi
+}
+
+# Retrieve the core content as XHTML of the blog post.
+atomfeed::content () {
+    local -r gmi_file_path="$1"; shift
+    log VERBOSE "Retrieving feed content from $gmi_file_path"
+
+    # sed: Remove all before the first header
+    # sed: Make HTML links absolute, Atom relative URLs feature seems a mess
+    # across different Atom clients.
+    html::fromgmi < <($SED '/Go back to the main site/d' "$gmi_file_path") |
+    $SED "
+        s|href=\"\./|href=\"https://$DOMAIN/gemfeed/|g;
+        s|src=\"\./|src=\"https://$DOMAIN/gemfeed/|g;
+    "
+}
+
+# Generate an atom.xml feed file.
+atomfeed::generate () {
+    local -r gemfeed_dir="$CONTENT_BASE_DIR/gemtext/gemfeed"
+    local -r atom_file="$gemfeed_dir/atom.xml"
+    local -r now=$($DATE --iso-8601=seconds)
+    log INFO "Generating Atom feed to $atom_file"
+
+    assert::not_empty now "$now"
+
+    cat <<ATOMHEADER > "$atom_file.tmp"
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom">
+    <updated>$now</updated>
+    <title>$DOMAIN feed</title>
+    <subtitle>$SUBTITLE</subtitle>
+    <link href="gemini://$DOMAIN/gemfeed/atom.xml" rel="self" />
+    <link href="gemini://$DOMAIN/" />
+    <id>gemini://$DOMAIN/</id>
+ATOMHEADER
+
+    while read -r gmi_file; do
+        # Load cached meta information about the post.
+        source <(atomfeed::meta "$gemfeed_dir/$gmi_file")
+
+        # Get HTML content for the feed
+        local content="$(atomfeed::content "$gemfeed_dir/$gmi_file")"
+
+        assert::not_empty meta_title "$meta_title"
+        assert::not_empty meta_date "$meta_date"
+        assert::not_empty meta_author "$meta_author"
+        assert::not_empty meta_email "$meta_email"
+        assert::not_empty meta_summary "$meta_summary"
+        assert::not_empty content "$content"
+
+        cat <<ATOMENTRY >> "$atom_file.tmp"
+    <entry>
+        <title>$meta_title</title>
+        <link href="gemini://$DOMAIN/gemfeed/$gmi_file" />
+        <id>gemini://$DOMAIN/gemfeed/$gmi_file</id>
+        <updated>$meta_date</updated>
+        <author>
+            <name>$meta_author</name>
+            <email>$meta_email</email>
+        </author>
+        <summary>$meta_summary</summary>
+        <content type="xhtml">
+            <div xmlns="http://www.w3.org/1999/xhtml">
+                $content
+            </div>
+        </content>
+    </entry>
+ATOMENTRY
+    done < <(gemfeed::get_posts | head -n $ATOM_MAX_ENTRIES)
+
+    cat <<ATOMFOOTER >> "$atom_file.tmp"
+</feed>
+ATOMFOOTER
+
+    # Delete the 3rd line of the atom feeds (global feed update timestamp)
+    if ! diff -u <($SED 3d "$atom_file") <($SED 3d "$atom_file.tmp"); then
+        log INFO 'Feed got something new!'
+        mv "$atom_file.tmp" "$atom_file"
+        git::add gemtext "$atom_file"
+    else
+        log INFO 'Nothing really new in the feed'
+        rm "$atom_file.tmp"
+    fi
+}
-- 
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