Add pre-commit hook and add missing test files

.pre-commit-config.yaml

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+repos:
+  - repo: local
+    hooks:
+      - id: nimble-test-src-nim
+        name: Run nimble test for src Nim changes
+        entry: nimble test
+        language: system
+        pass_filenames: false
+        files: ^src/.*\.nim$

tests/cli_flags.nim

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+import std/unittest
+import std/os
+import std/osproc
+import std/streams
+import std/strutils
+import std/times
+
+
+proc freshTempDir(prefix: string): string =
+    result = joinPath(getTempDir(), prefix & "-" & $getTime().toUnixFloat())
+    createDir(result)
+
+
+proc runCmd(cmd: string, args: openArray[string], workingDir: string): tuple[output: string, exitCode: int] =
+    var process = startProcess(cmd, workingDir = workingDir, args = @args,
+                               options = {poUsePath, poStdErrToStdOut})
+    defer:
+        close(process)
+    result.output = process.outputStream.readAll()
+    result.exitCode = waitForExit(process)
+
+
+let
+    projectDir = parentDir(parentDir(currentSourcePath()))
+    binDir = freshTempDir("peon-cli-bin")
+    peonBinary = joinPath(binDir, "peon-cli-test")
+
+let compile = runCmd("nim", ["c", "--hints:off", "--verbosity:0", "-o:" & peonBinary, "src/peon.nim"], projectDir)
+doAssert compile.exitCode == 0, compile.output
+
+
+suite "cli stage flags":
+    test "--noParse stops after lexing":
+        let tempDir = freshTempDir("peon-cli-no-parse")
+        defer:
+            removeDir(tempDir)
+
+        let depPath = joinPath(tempDir, "dep.pn")
+        let mainPath = joinPath(tempDir, "main.pn")
+        writeFile(depPath, "var value = ;\n")
+        writeFile(mainPath, "import dep;\n")
+
+        let execution = runCmd(peonBinary, ["--noParse", mainPath], tempDir)
+
+        check execution.exitCode == 0
+        check "Error" notin execution.output
+
+    test "--noTypeCheck skips semantic validation":
+        let tempDir = freshTempDir("peon-cli-no-typecheck")
+        defer:
+            removeDir(tempDir)
+
+        let sourcePath = joinPath(tempDir, "main.pn")
+        writeFile(sourcePath, """var value: int64 = "hello";""")
+
+        let execution = runCmd(peonBinary, ["--noTypeCheck", sourcePath], tempDir)
+
+        check execution.exitCode == 0
+        check "TypeCheckError" notin execution.output
+        check "Error" notin execution.output
+
+    test "--noGen skips artifact generation":
+        let tempDir = freshTempDir("peon-cli-no-gen")
+        defer:
+            removeDir(tempDir)
+
+        let sourcePath = joinPath(tempDir, "main.pn")
+        let outputPath = joinPath(tempDir, "main-out.pbc")
+        writeFile(sourcePath, "var value = 1;\n")
+
+        let execution = runCmd(peonBinary, ["--noGen", "--output", outputPath, sourcePath], tempDir)
+
+        check execution.exitCode == 0
+        check not fileExists(outputPath)

tests/hello.pn

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+import std;
+
+
+print("Hello, world!");