5 files changed, 98 insertions(+), 3 deletions(-)

A flake.lock
A flake.nix
M go.mod
M go.sum
M openring.go

@@ 0,0 1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1699099776,
+        "narHash": "sha256-X09iKJ27mGsGambGfkKzqvw5esP1L/Rf8H3u3fCqIiU=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "85f1ba3e51676fa8cc604a3d863d729026a6b8eb",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

@@ 0,0 1,35 @@
+{
+  description = "Sharpie monorepo";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  };
+
+  outputs = inputs@{ self, nixpkgs, ... }:
+  let
+    # System types to support.
+    supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-darwin" ];
+
+    # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+    forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+
+    # Nixpkgs instantiated for supported system types.
+    nixpkgsFor = forAllSystems (system: import nixpkgs {
+      inherit system;
+    });
+  in
+    {
+      packages = forAllSystems (system:
+        let
+          pkgs = nixpkgsFor."${system}";
+        in
+          {
+            default = pkgs.buildGoModule {
+              name = "openring";
+              src = ./.;
+
+              vendorHash = "sha256-Uw9ygbfx2HQwQPZiGzRFsXJfzd752s19d4S4QA0S9fo=";
+            };
+          });
+      };
+}

@@ 5,6 5,7 @@ go 1.12
 require (
 	git.sr.ht/~sircmpwn/getopt v0.0.0-20190621174457-292febf82fd0
 	github.com/SlyMarbo/rss v1.0.1
+	github.com/gilliek/go-opml v1.0.0 // indirect
 	github.com/mattn/go-runewidth v0.0.4
 	github.com/microcosm-cc/bluemonday v1.0.2
 )

@@ 7,6 7,8 @@ github.com/SlyMarbo/rss v1.0.1/go.mod h1:JNF+T33oj4m5WLCQXpBTCgO+SxRbYVgdiiimHNg
 github.com/axgle/mahonia v0.0.0-20180208002826-3358181d7394 h1:OYA+5W64v3OgClL+IrOD63t4i/RW7RqrAVl9LTZ9UqQ=
 github.com/axgle/mahonia v0.0.0-20180208002826-3358181d7394/go.mod h1:Q8n74mJTIgjX4RBBcHnJ05h//6/k6foqmgE45jTQtxg=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gilliek/go-opml v1.0.0 h1:X8xVjtySRXU/x6KvaiXkn7OV3a4DHqxY8Rpv6U/JvCY=
+github.com/gilliek/go-opml v1.0.0/go.mod h1:fOxmtlzyBvUjU6bjpdjyxCGlWz+pgtAHrHf/xRZl3lk=
 github.com/mattn/go-runewidth v0.0.4 h1:2BvfKmzob6Bmd4YsL0zygOqfdFnK7GR4QL06Do4/p7Y=
 github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
 github.com/microcosm-cc/bluemonday v1.0.2 h1:5lPfLTTAvAbtS0VqT+94yOtFnGfUWYyx0+iToC3Os3s=

@@ 10,13 10,14 @@
 // Copyright: 2020 skuzzymiglet <skuzzymiglet@gmail.com>
 // Copyright: 2021 Gianluca Arbezzano <ciao@gianarb.it>
 // Copyright: 2021 sourque <contact@sourque.com>
+// Copyright: 2023 Victor Freire <victor@freire.dev.br>
 package main
 
 import (
 	"bufio"
 	"html"
 	"html/template"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/url"
 	"os"


@@ 27,6 28,7 @@ import (
 	"git.sr.ht/~sircmpwn/getopt"
 
 	"github.com/SlyMarbo/rss"
+	"github.com/gilliek/go-opml/opml"
 	"github.com/mattn/go-runewidth"
 	"github.com/microcosm-cc/bluemonday"
 )


@@ 50,6 52,22 @@ func (us *urlSlice) Set(val string) error {
 	return nil
 }
 
+// flattenOutlines receives a list of outlines and flattlen them
+func flattenOutlines(inputs []opml.Outline) []opml.Outline {
+	var acc []opml.Outline
+	for _, x := range inputs {
+		if len(x.Outlines) == 0 {
+			// we don't need it anymore
+			x.Outlines = nil
+			acc = append(acc, x)
+		} else {
+			acc = append(acc, flattenOutlines(x.Outlines)...)
+		}
+	}
+
+	return acc
+}
+
 type Article struct {
 	Date        time.Time
 	Link        string


@@ 65,12 83,13 @@ func main() {
 		perSource  = getopt.Int("p", 1, "articles to take from each source")
 		summaryLen = getopt.Int("l", 256, "length of summaries")
 		urlsFile   = getopt.String("S", "", "file with URLs of sources")
+		opmlFile   = getopt.String("O", "", "OPML file")
 		sources    []*url.URL
 	)
 	getopt.Var((*urlSlice)(&sources), "s", "list of sources")
 
 	getopt.Usage = func() {
-		log.Fatalf("Usage: %s [-s https://source.rss...] < in.html > out.html",
+		log.Fatalf("Usage: %s [-O opml.xml] [-s https://source.rss...] < in.html > out.html",
 			os.Args[0])
 	}
 


@@ 91,7 110,18 @@ func main() {
 		file.Close()
 	}
 
-	input, err := ioutil.ReadAll(os.Stdin)
+	if *opmlFile != "" {
+		doc, err := opml.NewOPMLFromFile(*opmlFile)
+		if err != nil {
+			panic(err)
+		}
+		outlines := flattenOutlines(doc.Body.Outlines)
+		for _, x := range outlines {
+			(*urlSlice)(&sources).Set(x.XMLURL)
+		}
+	}
+
+	input, err := io.ReadAll(os.Stdin)
 	if err != nil {
 		panic(err)
 	}