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const { exec } = require("child_process");
const { differenceInMilliseconds } = require('date-fns');
const fs = require('fs');
const log_format='{"hash": "%H", "author": "%an", "author_email": "%ae", "date": "%at", "subject": "%s"}';
function execGit(path, action , format, args = "")
{
return new Promise((resolve) =>
{
exec(`git -C ${path} ${action} ${args} --format=format:'${format}'`, (error, stdout, stderr) =>
{
if(error) {
const no_such_fileor_dir = new RegExp(`cannot change to '${path.replace('/', "\/")}': No such file or directory\\n$`);
if(no_such_fileor_dir.test(error.message)) {
resolve({ "error": 404 });
return;
}
resolve({ "error": error.message });
return;
}
if(stderr) {
resolve({ "error": "Failed to communicate with git!" });
return;
}
resolve({ "data": stdout });
});
});
}
async function getLog(path)
{
let log = await execGit(path, "log", log_format);
if(!log["error"]) {
log["data"] = log["data"].split('\n');
log["data"].forEach((entry, index) => log["data"][index] = JSON.parse(entry));
}
return log;
}
function getOptimalDateDifference(difference)
{
const time_values = {
"second": 1000,
"minute": 60000,
"hour": 3600000,
"day": 86400000,
"week": 604800000,
"month": 2629800000,
"year": 31557600000
};
let last;
for(const [key, value] of Object.entries(time_values)) {
if(difference > value) {
last = key;
continue;
}
break;
}
return `${Math.round(difference / time_values[last])} ${last}s`;
}
async function getTimeSinceLatestCommit(path)
{
let commit_timestamp = (await execGit(path, "log", "%at", "-n 1"));
if(!commit_timestamp["error"]) {
commit_timestamp = commit_timestamp["data"] * 1000;
const commit_date = new Date(commit_timestamp);
const now_date = new Date();
const difference = getOptimalDateDifference(differenceInMilliseconds(now_date, commit_date));
return difference;
}
return commit_timestamp;
}
function getRepoFile(base_dir, repo, file)
{
return new Promise(resolve =>
{
fs.readFile(`${base_dir}/${repo}/${file}`, async (err, content) =>
{
if(!err) {
resolve(content.toString().replaceAll('\n', ''));
return;
}
resolve("");
});
});
}
function getBasicRepoInfo(base_dir, repo_dirs)
{
return new Promise((resolve) =>
{
let repos = {};
repo_dirs.forEach(async (repo, index, arr) =>
{
const desc = await getRepoFile(base_dir, repo, "description");
const owner = await getRepoFile(base_dir, repo, "owner");
const last_commit_date = await getTimeSinceLatestCommit(`${base_dir}/${repo}`);
let repo_name = "";
repo_name = repo.slice(0, -4);
repos[repo_name] = { "description": desc, "owner": owner, "last_updated": last_commit_date };
if(index === 0) resolve(repos);
});
});
}
module.exports.getLog = getLog;
module.exports.getBasicRepoInfo = getBasicRepoInfo;
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