Added support for fetching individual posts. Improved use of yargs, --help now available. Refactored main app flow.

README.md

@@ -33,13 +33,14 @@ reddit-post-dump requires a arbitrarily recent version of Node.js. Before use, d
 `npm install`
 
 ## Usage
-`node app.js --user={username}`
+`node app.js (--user <username> | --post <post-id>)`
 
-### Optional parameters
-* `--users={user1,user2}`: You may fetch posts from multiple users by either supplying a comma-separated list of usernames (no spaces) with `--users`, or by using multiple individual `--user` arguments
-* `--limit={number}`: Maximum amount posts per user to fetch content from. Limit is applied after fltering out ignored, cross- and reposts.
-* `--sort={method}`: How posts should be sorted while fetched. This affects the `$postIndex` variable, and in combination with a `--limit` decides what posts will be included.
-* `--ignore={prop1,prop2}`: Ignore submissions that have any of these comma-separated properties. Supported properties include `pinned`, `stickied`, `hidden`, `over_18`, `spoiler` (protip: any property in the API response can be ignored, if desired).
+### Optional arguments
+* `--users <username> [<username>...]`: You may fetch posts from multiple users by supplying a space-separated list of usernames to `--users`.
+* `--posts <post-id> [<post-id>...]`: Fetch multiple posts by supplying a space-separated list of post IDs to `--posts`.
+* `--limit <number>`: Maximum amount posts per user to fetch content from. Limit is applied after fltering out ignored, cross- and reposts.
+* `--sort <method>`: How posts should be sorted while fetched. This affects the `$postIndex` variable, and in combination with a `--limit` decides what posts will be included.
+* `--ignore <prop> [<prop>...]`: Ignore posts with any of the following properties: `pinned`, `stickied`, `hidden`, `over_18`, `spoiler`.
 
 ### Examples
 * `node app.js --user=ThePendulum`

src/app.js

@@ -3,18 +3,17 @@
 const config = require('config');
 const util = require('util');
 const fs = require('fs-extra');
-const yargs = require('yargs').argv;
 const snoowrap = require('snoowrap');
 const promiseFinally = require('promise.prototype.finally');
 
 const reddit = new snoowrap(config.reddit.api);
 
-const curateSubmissions = require('./curate/submissions.js');
+const curatePosts = require('./curate/posts.js');
 const curateUser = require('./curate/user.js');
 
 const interpolate = require('./interpolate.js');
 
-const fetchInfo = require('./fetch/info.js');
+const attachContentInfo = require('./fetch/info.js');
 const fetchContent = require('./fetch/content.js');
 
 const save = require('./save/save.js');
@@ -22,41 +21,72 @@ const saveProfileDetails = require('./save/profileDetails.js');
 
 promiseFinally.shim();
 
-const limit = yargs.limit || config.fetch.limit;
+const args = require('./cli.js');
 
-// allow for any combination of --ignore val1 --ignore val2, --ignore=val1,val2
-const ignore = yargs.ignore ? [].concat(yargs.ignore).reduce((acc, prop) => acc.concat(prop.split(',')), []) : [];
-
-if(!yargs.user && typeof yargs.users !== 'string') {
-    return console.log('\x1b[31m%s\x1b[0m', 'Please supply at least one user with --user=[user], or multiple users with --users=[user1,user2] or --user=[user1] --user=[user2]');
+if(!(args.users && args.users.length) && !(args.posts && args.posts.length)) {
+    return console.log('\x1b[31m%s\x1b[0m', 'Please supply at least one user with --user <user> or one post with --post <post-id>. See --help for more options.');
 }
 
-const users = yargs.users ? yargs.users.split(',') : [].concat(yargs.user);
+Promise.resolve().then(() => {
+    if(args.users) {
+        return getUserPosts(args.users);
+    }
+}).then((userPosts = []) => {
+    if(args.posts) {
+        return getPosts(args.posts).then(posts => posts.concat(userPosts));
+    }
 
-users.forEach(username => {
-    return Promise.resolve().then(() => {
-        return reddit.getUser(username).fetch().then(curateUser);
-    }).then(user => {
-        return saveProfileDetails(user);
-    }).then(user => {
-        return reddit.getUser(username).getSubmissions({
-            sort: yargs.sort || config.fetch.sort,
-            limit: Infinity
-        }).then(submissions => ({
-            user,
-            submissions
-        }));
-    }).then(({user, submissions}) => {
-        const posts = curateSubmissions(submissions, ignore);
-        const limitedPosts = posts.slice(0, limit);
-
-        return fetchInfo(limitedPosts).then(info => ({
-            user,
-            posts
-        }));
-    }).then(({user, posts}) => {
-        return fetchContent(posts, user);
-    }).catch(error => {
-        return console.log('\x1b[31m%s\x1b[0m', error);
-    });
+    return userPosts;
+}).then(posts => {
+    return curatePosts(posts).slice(0, args.limit);
+}).then(posts => {
+    return attachContentInfo(posts).then(info => fetchContent(posts));
+}).catch(error => {
+    return console.error(error);
 });
+
+function getUserPosts(users) {
+    return users.reduce((chain, username) => {
+        return chain.then(accPosts => {
+            return reddit.getUser(username).fetch().then(curateUser).then(saveProfileDetails).then(user => ({user, accPosts}));
+        }).then(({user, accPosts}) => {
+            return reddit.getUser(username).getSubmissions({
+                sort: args.sort,
+                limit: Infinity
+            }).then(posts => {
+                return accPosts.concat(posts.map(post => {
+                    post.user = user;
+
+                    return post;
+                }));
+            });
+        });
+    }, Promise.resolve([]));
+};
+
+function getPosts(postIds) {
+    return postIds.reduce((chain, postId) => {
+        return chain.then(acc => {
+            return reddit.getSubmission(postId).fetch().then(post => ({post, acc}));
+        }).then(({post, acc}) => {
+            if(acc.users[post.author.name]) {
+                return {post, acc, user: acc.users[post.author.name]}
+            }
+
+            return reddit.getUser(post.author.name).fetch().then(curateUser).then(saveProfileDetails).then(user => ({post, acc, user}));
+        }).then(({post, acc, user}) => {
+            post.user = user;
+            acc.posts.push(post);
+
+            // keep track of users to prevent fetching one user multiple times
+            acc.users[user.name] = user;
+
+            return acc;
+        });
+    }, Promise.resolve({
+        posts: [],
+        users: {}
+    })).then(({posts, users}) => {
+        return posts;
+    });
+};

src/cli.js

@@ -0,0 +1,26 @@
+'use strict';
+
+const config = require('config');
+const yargs = require('yargs');
+
+module.exports = yargs.option('users', {
+    alias: 'user',
+    describe: 'Reddit usernames to fetch posts from',
+    type: 'array'
+}).option('posts', {
+    alias: 'post',
+    describe: 'Reddit post IDs to fetch',
+    type: 'array'
+}).option('limit', {
+    describe: 'Maximum amount of posts to fetch after filtering out ignored, cross- and reposts',
+    type: 'number',
+    default: config.fetch.limit
+}).option('sort', {
+    describe: 'Property to sort posts by',
+    choices: ['new', 'top', 'hot', 'controversial'],
+    default: config.fetch.sort
+}).option('ignore', {
+    describe: 'Ignore posts with any of these properties',
+    type: 'array',
+    choices: ['pinned', 'stickied', 'hidden', 'spoiler', 'over_18']
+}).argv;

src/curate/posts.js

@@ -0,0 +1,46 @@
+'use strict';
+
+const config = require('config');
+const dissectLink = require('../dissectLink.js');
+
+function curatePosts(posts, ignore) {
+    const processed = new Set();
+
+    return posts.reduce((acc, post, index) => {
+        const host = dissectLink(post.url);
+        const ignoring = ignore ? ignore.find(prop => {
+            return post[prop];
+        }) : null;
+
+        if(ignoring) {
+            console.log('\x1b[33m%s\x1b[0m', `Ignoring ${ignoring} post '${post.title}' - ${post.url}`);
+
+            return acc;
+        }
+
+        if(host) {
+            if(config.fetch.avoidDuplicates && processed.has(host.id)) {
+                console.log('\x1b[33m%s\x1b[0m', `Ignoring cross-post or repost '${post.title}' - ${post.url}`);
+
+                return acc;
+            }
+
+            processed.add(host.id);
+        }
+
+        return acc.concat({
+            id: post.id,
+            index: index,
+            title: post.title,
+            text: post.selftext,
+            user: post.user,
+            permalink: 'https://reddit.com' + post.permalink,
+            url: post.url,
+            datetime: new Date(post.created_utc * 1000),
+            subreddit: post.subreddit.display_name,
+            host
+        });
+    }, []);
+};
+
+module.exports = curatePosts;

src/curate/submissions.js

@@ -1,48 +0,0 @@
-'use strict';
-
-const config = require('config');
-const dissectLink = require('../dissectLink.js');
-
-function curateSubmissions(submissions, ignore) {
-    const processed = new Set();
-
-    return submissions.reduce((acc, submission, index) => {
-        const host = dissectLink(submission.url);
-        const ignoring = ignore.find(prop => {
-            return submission[prop];
-        });
-
-        if(ignoring) {
-            console.log('\x1b[33m%s\x1b[0m', `Ignoring ${ignoring} post '${submission.title}' - ${submission.url}`);
-
-            return acc;
-        }
-
-        if(host) {
-            if(config.fetch.avoidDuplicates && processed.has(host.id)) {
-                console.log('\x1b[33m%s\x1b[0m', `Ignoring cross-post or repost '${submission.title}' - ${submission.url}`);
-
-                return acc;
-            }
-
-            processed.add(host.id);
-        }
-
-        const curatedSubmission = {
-            id: submission.id,
-            index: index,
-            title: submission.title,
-            text: submission.selftext,
-            user: submission.author.name,
-            permalink: 'https://reddit.com' + submission.permalink,
-            url: submission.url,
-            datetime: new Date(submission.created_utc * 1000),
-            subreddit: submission.subreddit.display_name,
-            host
-        };
-
-        return acc.concat(curatedSubmission);
-    }, []);
-};
-
-module.exports = curateSubmissions;

src/fetch/content.js

@@ -16,7 +16,7 @@ const exiftoolBin = require('dist-exiftool');
 
 const ep = new exiftool.ExiftoolProcess(exiftoolBin);
 
-module.exports = function(posts, user) {
+module.exports = function(posts) {
     return Promise.resolve().then(() => {
         return ep.open();
     }).then(() => {
@@ -37,7 +37,7 @@ module.exports = function(posts, user) {
             })).then(items => {
                 return Promise.all(items.map(item => {
                     const type = item.type.split('/')[0];
-                    const filepath = post.content.album ? interpolate(config.library.album[type], user, post, item) : interpolate(config.library[type], user, post, item);
+                    const filepath = post.content.album ? interpolate(config.library.album[type], post.user, post, item) : interpolate(config.library[type], post.user, post, item);
 
                     return Promise.resolve().then(() => {
                         return fs.ensureDir(path.dirname(filepath));
@@ -49,7 +49,7 @@ module.exports = function(posts, user) {
                         }
                     }).then(() => {
                         const meta = Object.entries(config.library.meta).reduce((acc, [key, value]) => {
-                            const interpolatedValue = interpolate(value, user, post, item);
+                            const interpolatedValue = interpolate(value, post.user, post, item);
 
                             if(interpolatedValue) {
                                 acc[key] = interpolatedValue;

src/fetch/info.js

@@ -2,7 +2,7 @@
 
 const methods = require('../methods/methods.js');
 
-function fetchInfo(posts) {
+function attachContentInfo(posts) {
     return Promise.all(posts.reduce((acc, post) => {
         if(post.host && methods[post.host.method]) {
             acc = acc.concat(methods[post.host.method](post).then(content => {
@@ -18,4 +18,4 @@ function fetchInfo(posts) {
     }, []));
 };
 
-module.exports = fetchInfo;
+module.exports = attachContentInfo;