subtree(users/wpcarro): docking briefcase at '24f5a642'

git-subtree-dir: users/wpcarro
git-subtree-mainline: 464bbcb15c
git-subtree-split: 24f5a642af
Change-Id: I6105b3762b79126b3488359c95978cadb3efa789

users/wpcarro/tools/run/.envrc

@@ -0,0 +1,2 @@
+source_up
+use_nix

users/wpcarro/tools/run/README.md

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+# run
+
+Simplify the commands you call to run scripts on the command line.
+
+```shell
+> run path/to/file.py
+> run path/to/file.ts
+```
+
+## How?
+
+Define a run.json configuration mapping commands to filename extensions like
+so:
+```json
+{
+  ".ts": "npx ts-node $file",
+  ".py": "python3 $file"
+}
+```
+
+Then call `run path/to/some/file.ts` on the command line, and `npx ts-node
+file.ts` will run.
+
+## Installation
+
+Install `run` using Nix.
+
+```shell
+> nix-env -iA briefcase.run
+```

users/wpcarro/tools/run/default.nix

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+{ pkgs, depot, briefcase, ... }:
+
+depot.buildGo.program {
+  name = "run";
+  srcs = [
+    ./main.go
+  ];
+  deps = with briefcase.gopkgs; [
+    utils
+  ];
+}

users/wpcarro/tools/run/main.go

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+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"utils"
+)
+
+func main() {
+	if len(os.Args) != 2 {
+		log.Fatal("You can only call run with a single file at a time.")
+	}
+
+	rulesPath := utils.Resolve("run.json", []string{"/home/wpcarro/.config/run/run.json"})
+	b, err := ioutil.ReadFile(rulesPath)
+	if err != nil {
+		log.Fatal("Could not locate a run.json file: ", err)
+	}
+	rules := map[string]string{}
+	err = json.Unmarshal(b, &rules)
+	if err != nil {
+		log.Fatal("Could not decode run.json as JSON: ", err)
+	}
+
+	fileName := os.Args[1]
+	ext := filepath.Ext(fileName)
+	cmd, ok := rules[ext]
+
+	if !ok {
+		log.Fatalf("No rules for extension, %s, have been defined.", ext)
+	}
+
+	// TODO(wpcarro): Support more sophisticated parsing than just string
+	// splitting. To handle 'cases like this'.
+	tokens := strings.Split(strings.Replace(cmd, "$file", fileName, 1), " ")
+	c := exec.Command(tokens[0], tokens[1:]...)
+	err = c.Start()
+	// TODO(wpcarro): Forward STDERR and STDOUT.
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(c.Wait())
+}

users/wpcarro/tools/run/shell.nix

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+let
+  briefcase = import <briefcase> {};
+  pkgs = briefcase.third_party.pkgs;
+in pkgs.mkShell {
+  buildInputs = with pkgs; [
+    go
+    goimports
+    godef
+  ];
+}