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diff-features.js
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104 lines (90 loc) · 2.92 KB
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const { execSync } = require('child_process');
const fs = require('fs');
const yargs = require('yargs');
function main({ ref1, ref2, format }) {
let refA, refB;
if (ref1 === undefined && ref2 === undefined) {
// No refs: compare HEAD to parent commit
refA = 'HEAD^';
refB = 'HEAD';
} else if (ref2 === undefined) {
// One ref: compare ref to parent of ref
refB = `${ref1}`;
refA = `${ref1}^`;
} else {
// Two refs: compare ref2 to ref1
refA = `${ref2}`;
refB = `${ref1}`;
}
const aSide = new Set(enumerateFeatures(refA));
const bSide = new Set(enumerateFeatures(refB));
const results = {
added: [...bSide].filter(feature => !aSide.has(feature)),
removed: [...aSide].filter(feature => !bSide.has(feature)),
};
if (format === 'markdown') {
printMarkdown(results);
} else {
console.log(JSON.stringify(results, undefined, 2));
}
}
function enumerateFeatures(ref = 'HEAD') {
// Get the short hash for this ref.
// Most of the time, you check out named references (a branch or a tag).
// However, if `ref` is already checked out, then `git worktree add` fails. As
// long as you haven't checked out a detached HEAD for `ref`, then
// `git worktree add` for the hash succeeds.
const hash = execSync(`git rev-parse --short ${ref}`, {
encoding: 'utf-8',
}).trim();
const worktree = `__enumerating__${hash}`;
console.error(`Enumerating features for ${ref} (${hash})`);
try {
execSync(`git worktree add ${worktree} ${hash}`);
execSync(`npm ci`, { cwd: worktree });
execSync(`node ./scripts/enumerate-features.js --data-from=${worktree}`);
return JSON.parse(fs.readFileSync('.features.json', { encoding: 'utf-8' }));
} finally {
execSync(`git worktree remove ${worktree}`);
}
}
function printMarkdown({ added, removed }) {
const fmtFeature = feat => `- \`${feat}\``;
if (removed.length) {
console.log('## Removed\n');
console.log(removed.map(fmtFeature).join('\n'));
}
if (added.length) {
if (removed.length) console.log('');
console.log('## Added\n');
console.log(added.map(fmtFeature).join('\n'));
}
}
const { argv } = yargs.command(
'$0 [ref1] [ref2]',
'Compare the set of features at refA and refB',
yargs => {
yargs
.positional('ref1', {
description: 'A Git ref (branch, tag, or commit)',
defaultDescription: 'ref1^',
})
.positional('ref2', {
description: 'A Git ref (branch, tag, or commit)',
defaultDescription: 'HEAD',
})
.option('format', {
type: 'string',
nargs: 1,
choices: ['json', 'markdown'],
demand: 'a named format is required',
default: 'markdown',
})
.example('$0', 'compare HEAD to parent commmit')
.example('$0 176d4ed', 'compare 176d4ed to its parent commmit')
.example('$0 topic-branch main', 'compare a branch to main');
},
);
if (require.main === module) {
main(argv);
}