Renamed files in git diff --name-status (#1023)

* Creates the `DiffResultNameStatusFile` type to represent file detail returned by the `git diff --name-status` parser.

Adds a `from?: string` property, to be populated with the file's previous name if it has been renamed.

* Update tests throughout

* Changeset

.changeset/quiet-socks-pull.md

@@ -0,0 +1,5 @@
+---
+'simple-git': minor
+---
+
+Diff summary includes original name of renamed files when run wiht the `--name-status` option.

simple-git/src/lib/parsers/parse-diff-summary.ts

@@ -94,10 +94,11 @@ const nameStatusParser = [
          result.files.push({
             file: to ?? from,
             changes: 0,
-            status: orVoid(isDiffNameStatus(status) && status),
             insertions: 0,
             deletions: 0,
             binary: false,
+            status: orVoid(isDiffNameStatus(status) && status),
+            from: orVoid(!!to && from !== to && from),
          });
       }
    ),

simple-git/test/integration/diff.spec.ts

@@ -23,6 +23,29 @@ describe('diff', function () {
       await context.file(nameWithTrailingSpaces, nextContent);
    });
 
+   it('detects moved files with --namestatus', async () => {
+      // save current repo state, move a file, commit that move, get the commit hash of the previous commit
+      const log = await newSimpleGit(context.root)
+         .add('.')
+         .commit('change content')
+         .mv(nameWithTrailingSpaces, 'next.file')
+         .add('.')
+         .commit('renaming')
+         .log();
+
+      const diffC = await newSimpleGit(context.root).diffSummary([
+         log.all[1].hash,
+         '--name-status',
+      ]);
+
+      expect(diffC.files).toEqual([
+         like({
+            file: 'next.file',
+            from: nameWithTrailingSpaces,
+         }),
+      ]);
+   });
+
    it('detects diff with --numstat', async () => {
       const diff = await newSimpleGit(context.root).diffSummary(['--numstat']);
 

simple-git/test/integration/log-name-status.spec.ts

@@ -26,21 +26,22 @@ describe('log-name-status', function () {
       const actual = await newSimpleGit(context.root).log(['--name-status']);
 
       expect(actual.all).toEqual([
-         mockListLogLine('two', { b: DiffNameStatus.RENAMED }),
-         mockListLogLine('one', { a: DiffNameStatus.ADDED }),
+         mockListLogLine('two', { b: [DiffNameStatus.RENAMED, 'a'] }),
+         mockListLogLine('one', { a: [DiffNameStatus.ADDED] }),
       ]);
    });
 });
 
-function mockListLogLine(message: string, changes: Record<string, DiffNameStatus>) {
-   const files: DiffResultTextFile[] = Object.entries(changes).map(([file, status]) => {
+function mockListLogLine(message: string, changes: Record<string, [DiffNameStatus, string?]>) {
+   const files: DiffResultTextFile[] = Object.entries(changes).map(([file, [status, from]]) => {
       return {
          binary: false,
          changes: 0,
          deletions: 0,
          file,
          insertions: 0,
          status,
+         from,
       };
    });
    return like({

simple-git/test/unit/diff.spec.ts

@@ -328,16 +328,18 @@ describe('diff', () => {
                      changes: 0,
                      insertions: 0,
                      deletions: 0,
-                     status: 'M',
                      binary: false,
+                     status: 'M',
+                     from: undefined,
                   },
                   {
                      file: 'to',
                      changes: 0,
                      insertions: 0,
                      deletions: 0,
-                     status: 'R',
                      binary: false,
+                     status: 'R',
+                     from: 'from',
                   },
                ],
             })

simple-git/typings/response.d.ts

@@ -142,27 +142,27 @@ export interface DiffResultTextFile {
    insertions: number;
    deletions: number;
    binary: false;
-
-   /** `--name-status` argument needed */
-   status?: DiffNameStatus;
 }
 
 export interface DiffResultBinaryFile {
    file: string;
    before: number;
    after: number;
    binary: true;
+}
 
-   /** `--name-status` argument needed */
-   status?: string;
+/** `--name-status` argument needed */
+export interface DiffResultNameStatusFile extends DiffResultTextFile {
+   status?: DiffNameStatus;
+   from?: string;
 }
 
 export interface DiffResult {
    /** The total number of files changed as reported in the summary line */
    changed: number;
 
    /** When present in the diff, lists the details of each file changed */
-   files: Array<DiffResultTextFile | DiffResultBinaryFile>;
+   files: Array<DiffResultTextFile | DiffResultBinaryFile | DiffResultNameStatusFile>;
 
    /** The number of files changed with insertions */
    insertions: number;