Replace lodash with specific implementations

package.json

@@ -54,7 +54,6 @@
     "dagre-d3": "^0.6.4",
     "graphlib": "^2.1.7",
     "he": "^1.2.0",
-    "lodash": "^4.17.11",
     "minify": "^4.1.1",
     "moment-mini": "^2.22.1",
     "scope-css": "^1.2.1"

src/diagrams/git/gitGraphAst.js

@@ -1,4 +1,3 @@
-import _ from 'lodash';
 import randomString from 'crypto-random-string';
 
 import { logger } from '../../logger';
@@ -43,6 +42,18 @@ function isReachableFrom(currentCommit, otherCommit) {
   return false;
 }
 
+function uniqBy(list, fn) {
+  const recordMap = Object.create(null);
+  return list.reduce((out, item) => {
+    const key = fn(item);
+    if (!recordMap[key]) {
+      recordMap[key] = true;
+      out.push(item);
+    }
+    return out;
+  }, []);
+}
+
 export const setDirection = function(dir) {
   direction = dir;
 };
@@ -142,7 +153,10 @@ function upsert(arr, key, newval) {
 }
 
 function prettyPrintCommitHistory(commitArr) {
-  const commit = _.maxBy(commitArr, 'seq');
+  const commit = commitArr.reduce((out, commit) => {
+    if (out.seq > commit.seq) return out;
+    return commit;
+  }, commitArr[0]);
   let line = '';
   commitArr.forEach(function(c) {
     if (c === commit) {
@@ -166,7 +180,7 @@ function prettyPrintCommitHistory(commitArr) {
     const nextCommit = commits[commit.parent];
     upsert(commitArr, commit, nextCommit);
   }
-  commitArr = _.uniqBy(commitArr, 'id');
+  commitArr = uniqBy(commitArr, c => c.id);
   prettyPrintCommitHistory(commitArr);
 }
 
@@ -205,7 +219,8 @@ export const getCommitsArray = function() {
   commitArr.forEach(function(o) {
     logger.debug(o.id);
   });
-  return _.orderBy(commitArr, ['seq'], ['desc']);
+  commitArr.sort((a, b) => b.seq - a.seq);
+  return commitArr;
 };
 export const getCurrentBranch = function() {
   return curBranch;

src/diagrams/git/gitGraphRenderer.js

@@ -1,5 +1,4 @@
 import { curveBasis, line, select } from 'd3';
-import _ from 'lodash';
 
 import db from './gitGraphAst';
 import gitGraphParser from './parser/gitGraph';
@@ -307,7 +306,7 @@ export const draw = function(txt, id, ver) {
     // Parse the graph definition
     parser.parse(txt + '\n');
 
-    config = _.assign(config, apiConfig, db.getOptions());
+    config = Object.assign(config, apiConfig, db.getOptions());
     logger.debug('effective options', config);
     const direction = db.getDirection();
     allCommitsDict = db.getCommits();