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const { spawn } = require("child_process");
const { differenceInMilliseconds } = require('date-fns');
const fs = require('fs');
function execGit(path, action, args = [""], error)
{
const git = spawn("git", ["-C", path, action, args].concat(args));
git.on("error", (err) =>
{
const no_such_file_or_dir = new RegExp(`cannot change to '${path.replace('/', "\/")}': No such file or directory\\n$`);
if(no_such_file_or_dir.test(err.toString())) {
error({ "error": 404 })
return;
}
error({ "error": err });
});
git.stderr.on("data", (err) => error({ "error": "Failed to communicate with git!", "message": err.toString() }));
return git;
}
function getLog(base_dir, path)
{
return new Promise((resolve) =>
{
let log = [];
const log_format='{"hash":"%H","author":"%an","author_email":"%ae","date":"%at","subject":"%s"}';
const git = execGit(`${base_dir}/${path}`, "log", [`--format=format:${log_format}`, "--shortstat"], (err) => resolve(err));
git.stdout.on("data", (data) =>
{
data = data.toString().split('\n').filter((item) => item != "");
data[0] = JSON.parse(data[0]);
["files changed", "insertions", "deletions"].forEach((stat) =>
{
const stat_nr = new RegExp(`(\\d+)\\ ${stat.replaceAll(/s(?=(\ |$))/g, "s?")}`).exec(data[1]);
data[0][stat.replaceAll(" ", "_")] = stat_nr ? stat_nr[1] : 0;
});
log.push(data[0]);
});
git.on("close", (code) =>
{
if(code === 0) {
resolve({ "data": log });
return;
}
resolve({ "error": "Failed to communicate with git!" });
});
})
}
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])} ${last}s`;
}
function getTimeSinceLatestCommit(path)
{
return new Promise((resolve) =>
{
const git = execGit(path, "log", [`--format=format:%at`, "-n 1"], (err) => resolve(err));
const commit = [];
git.stdout.on("data", (data) => commit.push(data));
git.on("close", (code) =>
{
const commit_timestamp = new Date(Number(Buffer.concat(commit).toString()) * 1000);
const now_date = new Date();
resolve(getOptimalDateDifference(differenceInMilliseconds(now_date, commit_timestamp)));
});
});
}
function getRepoFile(base_dir, repo, file)
{
return new Promise(resolve =>
{
fs.readFile(`${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);
});
});
}
function getRepos(base_dir)
{
return new Promise((resolve) =>
{
fs.readdir(base_dir, async (err, content) =>
{
if(err) {
resolve({ "error": err });
return;
}
resolve({ "data": content });
});
});
}
function getCommit(base_dir, repo, hash)
{
return new Promise((resolve) =>
{
const git = execGit(`${base_dir}/${repo}`, "show", ['--format=format:{\"hash\": \"%H\", \"author\": \"%an <%ae>\", \"date\": \"%at\", \"message\": \"%s\"}', hash], (err) => resolve(err));
let commit = [];
git.stdout.on("data", (data) =>
{
commit.push(data);
});
git.on("close", () =>
{
let diff = commit.toString().split('\n').slice(1);
var result = [];
let start;
diff.forEach((line, index) =>
{
if(/^diff\ --git a\/[^\ ]+\ b\/[^\ ]+$/.test(line) || index === diff.length - 1) {
if(start != undefined || start != NaN) {
let file_diff = diff.slice(start, index - 1);
let chunk_header_index = file_diff.findIndex((line) => /^@@\ -[0-9,]+\ \+[0-9,]+\ @@/.test(line));
if(chunk_header_index === -1) {
chunk_header_index = file_diff.length;
}
let file_info = {};
let header = file_diff.slice(1, chunk_header_index - 2);
const from_to = file_diff.slice(chunk_header_index - 2, chunk_header_index);
file_info["from"] = from_to[0].slice(4);
file_info["to"] = from_to[1].slice(4);
if(chunk_header_index != file_diff.length) {
const chunk_header = /^@@\ (-[0-9,]+)\ (\+[0-9,]+)\ @@(?:\ (.*))?/.exec(file_diff[chunk_header_index]);
file_info["from_file_range"] = chunk_header[1];
file_info["to_file_range"] = chunk_header[2];
file_info["diff"] = file_diff.slice(chunk_header_index + 1).join("\n");
if(chunk_header[3]) {
file_info["diff"] = chunk_header[3] + file_info["diff"];
}
}
header.forEach((line) =>
{
if(line.includes("old mode") || line.includes("new mode") || line.includes("deleted file mode") || line.includes("new file mode")) {
const data = /^(.*mode)\ (\d{6})$/.exec(line);
file_info[data[1].replaceAll(' ', "_")] = data[2];
}
else if(line.includes("copy from") || line.includes("copy to")) {
const data = /^(copy\ from|to)\ (.*)/.exec(line);
file_info[data[1].replaceAll(' ', "_")] = data[2];
}
else if(line.includes("rename from") || line.includes("rename to")) {
const data = /^(rename\ from|to)\ (.*)/.exec(line);
file_info[data[1].replaceAll(' ', "_")] = data[2];
}
else if(line.includes("similarity index") || line.includes("dissimilarity index")) {
const data = /^((?:dis)?similarity\ index)\ (\d+%)$/.exec(line);
file_info[data[1].replaceAll(' ', "_")] = data[2];
}
else if(line.includes("index")) {
const data = /^index\ ([0-9a-f,]+)\.\.([0-9a-f,]+)(?:\ (\d{6}))?$/.exec(line).slice(1);
file_info["index"] = { "before": data[0], "after": data[1] };
if(data[2]) {
file_info["index"]["mode"] = data[2];
}
}
});
result.push(file_info);
}
start = index;
}
if(index === diff.length - 1) {
let data = JSON.parse(commit.toString().split('\n').slice(0,1)[0]);
data["files"] = result;
resolve({ "data": data });
}
});
});
})
}
module.exports.getLog = getLog;
module.exports.getBasicRepoInfo = getBasicRepoInfo;
module.exports.getRepos = getRepos;
module.exports.getRepoFile = getRepoFile;
module.exports.getCommit = getCommit;
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