feat: sapling scm support

Now you can run this inside a sapling repo. It will automatically pick what
source control you are using by checking for the root repo.

src/index.ts

@@ -48,6 +48,40 @@ export const validate = async (argv: Argv) => {
   }
 };
 
+async function isGitRepo() {
+  const isGit = await exec(`git rev-parse --is-inside-work-tree`);
+  return isGit.code === 0;
+}
+
+async function isSaplingRepo() {
+  const isSapling = await exec(`sl root`);
+  return isSapling.code === 0;
+}
+
+async function getDiff(): Promise<string | undefined> {
+  if (await isGitRepo()) {
+    const diffText = await exec(`git diff origin/HEAD...HEAD`);
+    if (diffText.code > 0) {
+      error("Error loading the diff\n\n" + diffText.stderr);
+      return undefined;
+    }
+
+    return diffText.stdout;
+  }
+
+  if (await isSaplingRepo()) {
+    const diffText = await exec(`sl diff -g -r '. % public()'`);
+    if (diffText.code > 0) {
+      error("Error loading the diff\n\n" + diffText.stderr);
+      return undefined;
+    }
+
+    return diffText.stdout;
+  }
+
+  error("Unable to get a diff no repo was found\n");
+}
+
 export const run = async (argv = process.argv) => {
   const parsed: Argv = await yargs(hideBin(argv)).options(options).argv;
   const validationError = await validate(parsed);
@@ -62,12 +96,12 @@ export const run = async (argv = process.argv) => {
     return lcovDiff(baseCoverage, compareCoverage);
   }
 
-  const diffText = await exec(`git diff origin/HEAD...HEAD`);
-  if (diffText.code > 0) {
-    return error("Error loading the diff\n\n" + diffText.stderr);
+  const diffText = await getDiff();
+  if (!diffText) {
+    return;
   }
 
-  const diff = parseDiff.default(diffText.stdout);
+  const diff = parseDiff.default(diffText);
 
   const { percentage } = report(diff, baseCoverage);
   process.exit(percentage > 90 ? 0 : 1);

src/report.ts

@@ -1,7 +1,7 @@
 const getCoverageForFile = (file: any, coverage: any) => {
   for (const cov of coverage) {
     const report: { [k: number]: number } = {};
-    if (cov.file === file.to) {
+    if (cov.file.replace("./", "") === file.to) {
       for (const detail of cov.lines.details) {
         report[detail.line] = detail.hit;
       }