feat: add fallback to environment variables 43 (#57)

* feat: add fallback to environment variables, close #43

* chore: merging git and env fields

* chore: bring mocked-env for better testing

* use Ramda mergeWith

* feat: combine git and env variables, tested

* chore: better readme text

README.md

@@ -36,12 +36,25 @@ commitInfo(folder)
 
 Notes:
 
-- Code assumes there is `.git` folder and uses Git commands to get each property, like `git show -s --pretty=%B`, see [src/git-api.js](src/git-api.js)
+- Code assumes there is `.git` folder and uses Git commands to get each property, like `git show -s --pretty=%B`, see [src/git-api.js](src/git-api.js). Note: there is fallback to environment variables.
 - Resolves with [Bluebird](https://github.com/petkaantonov/bluebird) promise.
 - Only uses Git commands, see [src/git-api.js](src/git-api.js)
-- If a command fails, returns null for each property
+- If a command fails, returns `null` for each property
 - If you need to debug, run with `DEBUG=commit-info` environment variable.
 
+## Fallback environment variables
+
+If getting the commit information using `git` fails for some reason, you can provide the commit information by setting the environment variables. This module will look at the following environment variables as a fallback
+
+```
+branch: COMMIT_INFO_BRANCH
+message: COMMIT_INFO_MESSAGE
+email: COMMIT_INFO_EMAIL
+author: COMMIT_INFO_AUTHOR
+sha: COMMIT_INFO_SHA
+remote: COMMIT_INFO_REMOTE
+```
+
 ## Individual methods
 
 In addition to `commitInfo` this module also exposes individual promise-returning

__snapshots__/commit-info-spec.js

@@ -1,13 +1,25 @@
-exports['commit-info returns information 1'] = {
+exports['commit-info combination with environment variables has certain api 1'] = [
+  "commitInfo",
+  "getBranch",
+  "getMessage",
+  "getEmail",
+  "getAuthor",
+  "getSha",
+  "getRemoteOrigin",
+  "getSubject",
+  "getBody"
+]
+
+exports['commit-info combination with environment variables returns information 1'] = {
   "branch": "test-branch",
-  "message": "important commit",
-  "email": "me@foo.com",
+  "message": "some git message",
+  "email": "user@company.com",
   "author": "John Doe",
   "sha": "abc123",
   "remote": "git@github.com/repo"
 }
 
-exports['commit-info has certain api 1'] = [
+exports['commit-info no environment variables has certain api 1'] = [
   "commitInfo",
   "getBranch",
   "getMessage",
@@ -19,7 +31,16 @@ exports['commit-info has certain api 1'] = [
   "getBody"
 ]
 
-exports['commit-info returns empty strings for missing info 1'] = {
+exports['commit-info no environment variables returns information 1'] = {
+  "branch": "test-branch",
+  "message": "important commit",
+  "email": "me@foo.com",
+  "author": "John Doe",
+  "sha": "abc123",
+  "remote": "git@github.com/repo"
+}
+
+exports['commit-info no environment variables returns nulls for missing fields 1'] = {
   "branch": "test-branch",
   "message": null,
   "email": "me@foo.com",

package.json

@@ -81,10 +81,10 @@
     "github-post-release": "1.13.1",
     "license-checker": "20.2.0",
     "mocha": "5.2.0",
+    "mocked-env": "1.2.3",
     "nsp": "2.8.1",
     "pre-git": "3.17.1",
     "prettier-standard": "8.0.1",
-    "ramda": "0.26.0",
     "semantic-release": "8.2.3",
     "simple-commit-message": "3.3.2",
     "snap-shot-it": "6.2.5",
@@ -96,6 +96,7 @@
     "check-more-types": "2.24.0",
     "debug": "4.1.0",
     "execa": "1.0.0",
-    "lazy-ass": "1.6.0"
+    "lazy-ass": "1.6.0",
+    "ramda": "0.26.0"
   }
 }