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import { diffLines } from 'diff';
import { defaultDiffOptions } from '../editor_options';
export const computeDiff = (originalContent, newContent) => {
// prevent EOL changes from highlighting the entire file
const changes = diffLines(
originalContent.replace(/\r\n/g, '\n'),
newContent.replace(/\r\n/g, '\n'),
defaultDiffOptions,
);
let lineNumber = 1;
return changes.reduce((acc, change) => {
const findOnLine = acc.find((c) => c.lineNumber === lineNumber);
if (findOnLine) {
Object.assign(findOnLine, change, {
modified: true,
endLineNumber: lineNumber + change.count - 1,
});
} else if ('added' in change || 'removed' in change) {
acc.push({
...change,
lineNumber,
modified: undefined,
endLineNumber: lineNumber + change.count - 1,
});
}
if (!change.removed) {
lineNumber += change.count;
}
return acc;
}, []);
};
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