fix(lint): guard against directory failure (#28)

Author: patrickmichalina

src/commands/lint.ts

@@ -1,24 +1,10 @@
 import { command } from 'yargs'
-import { logInfo, log } from '../utilities/log'
+import { logInfo, log, logError } from '../utilities/log'
 import { Linter, Configuration, ILinterOptions } from 'tslint'
-import * as fs from 'fs'
-import chalk from 'chalk'
 import { resolve } from 'path'
-
-const fileName = resolve('src/server/server.ts')
-const configurationFilename = resolve('tslint.json')
-const options: ILinterOptions = {
-  fix: false,
-  formatter: 'json'
-}
-
-const fileContents = fs.readFileSync(fileName, 'utf8')
-const linter = new Linter(options)
-const configuration = Configuration.findConfiguration(
-  configurationFilename,
-  fileName
-).results
-linter.lint(fileName, fileContents, configuration)
+import { readFile_ } from '../utilities/rx-fs'
+import { take } from 'rxjs/operators'
+import chalk from 'chalk'
 
 command(
   'lint',
@@ -45,19 +31,41 @@ function errors(count: number) {
     : chalk.underline(`  ${str}  `)
 }
 
+function showErrorLoadingProject() {
+  logError('Could not load entry file, are you in a project directory?')
+}
+
 function lint() {
-  logInfo('Linter\n')
-  const result = linter.getResult()
-  log(`  Errors: `, errors(result.errorCount))
-  log(`Warnings: `, warnings(result.warningCount), '\n')
-
-  result.failures.map(obj => obj.toJson()).forEach(json => {
-    log(
-      `${json.ruleSeverity}(${json.ruleName}): ${json.name} (${
-        json.startPosition.line
-      }, ${json.startPosition.character}): ${json.failure}`
-    )
-  })
-
-  log('\n')
+  const fileName = resolve('src/server/server.ts')
+  const configurationFilename = resolve('tslint.json')
+  const options: ILinterOptions = {
+    fix: false,
+    formatter: 'json'
+  }
+
+  readFile_(fileName)
+    .pipe(take(1))
+    .subscribe(fileContents => {
+      const linter = new Linter(options)
+      const configuration = Configuration.findConfiguration(
+        configurationFilename,
+        fileName
+      ).results
+      linter.lint(fileName, fileContents.toString(), configuration)
+
+      logInfo('Linter\n')
+      const result = linter.getResult()
+      log(`  Errors: `, errors(result.errorCount))
+      log(`Warnings: `, warnings(result.warningCount), '\n')
+
+      result.failures.map(obj => obj.toJson()).forEach(json => {
+        log(
+          `${json.ruleSeverity}(${json.ruleName}): ${json.name} (${
+            json.startPosition.line
+          }, ${json.startPosition.character}): ${json.failure}`
+        )
+      })
+
+      log('\n')
+    }, showErrorLoadingProject)
 }