move abi-gen funcs from index to utils for testing

preparing for unit testing. purely refactoring (no functionality
changed).

packages/abi-gen/src/index.ts

@@ -3,15 +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 yargs from 'yargs';
 
-import toSnakeCase = require('to-snake-case');
-
 import { ContextData, ContractsBackend, ParamKind } from './types';
 import { utils } from './utils';
 
@@ -70,34 +67,6 @@ function registerPartials(partialsGlob: string): void {
     }
 }
 
-function makeOutputFilePath(name: string): string {
-    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');
-    return `${args.output}/${fileName}.ts`;
-}
-
-function writeOutputFile(name: string, renderedTsCode: string): void {
-    const filePath = makeOutputFilePath(name);
-    fs.writeFileSync(filePath, renderedTsCode);
-    logUtils.log(`Created: ${chalk.bold(filePath)}`);
-}
-
-function isOutputFileUpToDate(abiFile: string, outFile: string): boolean {
-    const abiFileModTimeMs = fs.statSync(abiFile).mtimeMs;
-    try {
-        const outFileModTimeMs = fs.statSync(makeOutputFilePath(outFile)).mtimeMs;
-        return outFileModTimeMs > abiFileModTimeMs;
-    } catch (err) {
-        if (err.code === 'ENOENT') {
-            return false;
-        } else {
-            throw err;
-        }
-    }
-}
-
 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) {
@@ -136,8 +105,11 @@ for (const abiFileName of abiFileNames) {
         process.exit(1);
     }
 
-    if (isOutputFileUpToDate(abiFileName, namedContent.name)) {
+    const outFileName = utils.makeOutputFileName(namedContent.name);
-        logUtils.log(`Already up to date: ${chalk.bold(makeOutputFilePath(namedContent.name))}`);
+    const outFilePath = `${args.output}/${outFileName}.ts`;
+
+    if (utils.isOutputFileUpToDate(abiFileName, outFilePath)) {
+        logUtils.log(`Aready up to date: ${chalk.bold(outFilePath)}`);
         continue;
     }
 
@@ -175,5 +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)}`);
 }

packages/abi-gen/src/utils.ts

@@ -2,6 +2,7 @@ import { AbiType, ConstructorAbi, DataItem } from 'ethereum-types';
 import * as fs from 'fs';
 import * as _ from 'lodash';
 import * as path from 'path';
+import toSnakeCase = require('to-snake-case');
 
 import { ContractsBackend, ParamKind } from './types';
 
@@ -92,4 +93,27 @@ export const utils = {
             inputs: [],
         };
     },
+    makeOutputFileName(name: string): string {
+        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');
+        return fileName;
+    },
+    writeOutputFile(filePath: string, renderedTsCode: string): void {
+        fs.writeFileSync(filePath, renderedTsCode);
+    },
+    isOutputFileUpToDate(abiFile: string, outputFile: string): boolean {
+        const abiFileModTimeMs = fs.statSync(abiFile).mtimeMs;
+        try {
+            const outFileModTimeMs = fs.statSync(outputFile).mtimeMs;
+            return outFileModTimeMs > abiFileModTimeMs;
+        } catch (err) {
+            if (err.code === 'ENOENT') {
+                return false;
+            } else {
+                throw err;
+            }
+        }
+    },
 };