113 lines
3.4 KiB
JavaScript
113 lines
3.4 KiB
JavaScript
/* eslint-disable @gitlab/require-i18n-strings */
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import { createTwoFilesPatch } from 'diff';
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import { commitActionTypes } from '~/ide/constants';
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const DEV_NULL = '/dev/null';
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const DEFAULT_MODE = '100644';
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const NO_NEW_LINE = '\\ No newline at end of file';
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const NEW_LINE = '\n';
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/**
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* Cleans patch generated by `diff` package.
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*
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* - Removes "=======" separator added at the beginning
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*/
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const cleanTwoFilesPatch = (text) => text.replace(/^(=+\s*)/, '');
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const endsWithNewLine = (val) => !val || val[val.length - 1] === NEW_LINE;
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const addEndingNewLine = (val) => (endsWithNewLine(val) ? val : val + NEW_LINE);
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const removeEndingNewLine = (val) => (endsWithNewLine(val) ? val.substr(0, val.length - 1) : val);
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const diffHead = (prevPath, newPath = '') =>
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`diff --git "a/${prevPath}" "b/${newPath || prevPath}"`;
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const createDiffBody = (path, content, isCreate) => {
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if (!content) {
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return '';
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}
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const prefix = isCreate ? '+' : '-';
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const fromPath = isCreate ? DEV_NULL : `a/${path}`;
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const toPath = isCreate ? `b/${path}` : DEV_NULL;
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const hasNewLine = endsWithNewLine(content);
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const lines = removeEndingNewLine(content).split(NEW_LINE);
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const chunkHead = isCreate ? `@@ -0,0 +1,${lines.length} @@` : `@@ -1,${lines.length} +0,0 @@`;
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const chunk = lines
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.map((line) => `${prefix}${line}`)
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.concat(!hasNewLine ? [NO_NEW_LINE] : [])
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.join(NEW_LINE);
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return `--- ${fromPath}
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+++ ${toPath}
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${chunkHead}
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${chunk}`;
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};
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const createMoveFileDiff = (prevPath, newPath) => `${diffHead(prevPath, newPath)}
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rename from ${prevPath}
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rename to ${newPath}`;
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const createNewFileDiff = (path, content) => {
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const diff = createDiffBody(path, content, true);
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return `${diffHead(path)}
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new file mode ${DEFAULT_MODE}
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${diff}`;
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};
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const createDeleteFileDiff = (path, content) => {
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const diff = createDiffBody(path, content, false);
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return `${diffHead(path)}
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deleted file mode ${DEFAULT_MODE}
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${diff}`;
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};
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const createUpdateFileDiff = (path, oldContent, newContent) => {
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const patch = createTwoFilesPatch(`a/${path}`, `b/${path}`, oldContent, newContent);
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return `${diffHead(path)}
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${cleanTwoFilesPatch(patch)}`;
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};
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const createFileDiffRaw = (file, action) => {
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switch (action) {
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case commitActionTypes.move:
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return createMoveFileDiff(file.prevPath, file.path);
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case commitActionTypes.create:
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return createNewFileDiff(file.path, file.content);
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case commitActionTypes.delete:
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return createDeleteFileDiff(file.path, file.content);
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case commitActionTypes.update:
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return createUpdateFileDiff(file.path, file.raw || '', file.content);
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default:
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return '';
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}
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};
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/**
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* Create a git diff for a single IDE file.
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*
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* ## Notes:
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* When called with `commitActionType.move`, it assumes that the move
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* is a 100% similarity move. No diff will be generated. This is because
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* generating a move with changes is not support by the current IDE, since
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* the source file might not have it's content loaded yet.
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*
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* When called with `commitActionType.delete`, it does not support
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* deleting files with a mode different than 100644. For the IDE mirror, this
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* isn't needed because deleting is handled outside the unified patch.
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*
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* ## References:
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* - https://git-scm.com/docs/git-diff#_generating_patches_with_p
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*/
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const createFileDiff = (file, action) =>
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// It's important that the file diff ends in a new line - git expects this.
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addEndingNewLine(createFileDiffRaw(file, action));
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export default createFileDiff;
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