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