1 files changed, 10 insertions, 16 deletions
diff --git a/packages/abi-gen/src/index.ts b/packages/abi-gen/src/index.ts
index 47f2c404b..753bb2cce 100644
--- a/packages/abi-gen/src/index.ts
+++ b/packages/abi-gen/src/index.ts
@@ -3,16 +3,12 @@
 import { abiUtils, logUtils } from '@0xproject/utils';
 import chalk from 'chalk';
 import { AbiDefinition, ConstructorAbi, EventAbi, MethodAbi } from 'ethereum-types';
-import * as fs from 'fs';
 import { sync as globSync } from 'glob';
 import * as Handlebars from 'handlebars';
 import * as _ from 'lodash';
 import * as mkdirp from 'mkdirp';
-import * as rimraf from 'rimraf';
 import * as yargs from 'yargs';
 
-import toSnakeCase = require('to-snake-case');
-
 import { ContextData, ContractsBackend, ParamKind } from './types';
 import { utils } from './utils';
 
@@ -71,16 +67,6 @@ function registerPartials(partialsGlob: string): void {
     }
 }
 
-function writeOutputFile(name: string, renderedTsCode: string): void {
-    let fileName = toSnakeCase(name);
-    // HACK: Snake case doesn't make a lot of sense for abbreviated names but we can't reliably detect abbreviations
-    // so we special-case the abbreviations we use.
-    fileName = fileName.replace('z_r_x', 'zrx').replace('e_r_c', 'erc');
-    const filePath = `${args.output}/${fileName}.ts`;
-    fs.writeFileSync(filePath, renderedTsCode);
-    logUtils.log(`Created: ${chalk.bold(filePath)}`);
-}
-
 Handlebars.registerHelper('parameterType', utils.solTypeToTsType.bind(utils, ParamKind.Input, args.backend));
 Handlebars.registerHelper('returnType', utils.solTypeToTsType.bind(utils, ParamKind.Output, args.backend));
 if (args.partials) {
@@ -97,7 +83,6 @@ if (_.isEmpty(abiFileNames)) {
     process.exit(1);
 } else {
     logUtils.log(`Found ${chalk.green(`${abiFileNames.length}`)} ${chalk.bold('ABI')} files`);
-    rimraf.sync(args.output);
     mkdirp.sync(args.output);
 }
 for (const abiFileName of abiFileNames) {
@@ -120,6 +105,14 @@ for (const abiFileName of abiFileNames) {
         process.exit(1);
     }
 
+    const outFileName = utils.makeOutputFileName(namedContent.name);
+    const outFilePath = `${args.output}/${outFileName}.ts`;
+
+    if (utils.isOutputFileUpToDate(abiFileName, outFilePath)) {
+        logUtils.log(`Aready up to date: ${chalk.bold(outFilePath)}`);
+        continue;
+    }
+
     let ctor = ABI.find((abi: AbiDefinition) => abi.type === ABI_TYPE_CONSTRUCTOR) as ConstructorAbi;
     if (_.isUndefined(ctor)) {
         ctor = utils.getEmptyConstructor(); // The constructor exists, but it's implicit in JSON's ABI definition
@@ -154,5 +147,6 @@ for (const abiFileName of abiFileNames) {
         events: eventAbis,
     };
     const renderedTsCode = template(contextData);
-    writeOutputFile(namedContent.name, renderedTsCode);
+    utils.writeOutputFile(outFilePath, renderedTsCode);
+    logUtils.log(`Created: ${chalk.bold(outFilePath)}`);
 }