Tidy up structure of briefcase

I had a spare fifteen minutes and decided that I should tidy up my
monorepo. The work of tidying up is not finished; this is a small step in the
right direction.

TL;DR
- Created a tools directory
- Created a scratch directory (see README.md for more information)
- Added README.md to third_party
- Renamed delete_dotfile_symlinks -> symlinkManager
- Packaged symlinkManager as an executable symlink-mgr using buildGo

tools/rfcToKindle/LICENSE

@@ -0,0 +1,202 @@
+
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tools/rfcToKindle/README.md

@@ -0,0 +1,30 @@
+# rfcToKindle
+
+Wirelessly transfer RFC documents to your Kindle to device for an alternative
+medium for reading.
+
+## Installation
+
+`rfcToKindle` makes use of [`buildGo.nix`][2] to package itself.  If you're
+using [Nix][1], you can install `rfcToKindle` using `nix-env`:
+
+```shell
+> nix-env -f https://github.com/wpcarro/rfcToKindle -i
+```
+
+## Usage
+
+```shell
+> rfcToKindle -document rfc6479 -recipient username@kindle.com
+```
+
+## Dependencies
+
+This uses `sendgmr` to send the file to the Kindle. Make sure:
+1. That `sendgmr` is installed and available on $PATH.
+2. That it is configured to work with your preferred email address.
+3. That the email address `sendgmr` is configured to use is whitelisted in
+   your Kindle "Personal Document Settings".
+
+[1]: https://nixos.org/nix/
+[2]: https://git.tazj.in/tree/nix/buildGo

tools/rfcToKindle/default.nix

@@ -0,0 +1,13 @@
+{
+  depot ? import <depot> {}, ...
+}:
+
+# TODO: This doesn't depend on `sendgmr` at the moment, but it should. As such,
+# it's an imcomplete packaging.
+depot.buildGo.program {
+  name = "rfcToKindle";
+  srcs = [
+    ./main.go
+  ];
+  deps = [];
+}

tools/rfcToKindle/main.go

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+// Author: wpcarro@gmail.com
+//
+// Wirelessly transfer RFC documents to your Kindle to device for an alternative
+// medium for reading.
+//
+// Usage:
+// ```shell
+// > go run rfcToKindle.go -document rfc6479 -recipient username@kindle.com
+// ```
+//
+// This uses `sendgmr` to send the file to the Kindle. Make sure:
+// 1. That `sendgmr` is installed and available on $PATH.
+// 2. That it is configured to work with your preferred email address.
+// 3. That the email address `sendgmr` is configured to use is whitelisted in
+//    your Kindle "Personal Document Settings".
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func main() {
+	document := flag.String("document", "", "(Required) The name of the document to fetch. For example \"RFC6479\".")
+	recipient := flag.String("recipient", "", "(Required) The email address of the Kindle device.")
+	subject := flag.String("subject", "", "(Optional) The email address of the Kindle device.")
+	flag.Parse()
+
+	if *document == "" {
+		// TODO: Is log.Fatal the best function to use here?
+		log.Fatal("-document cannot be empty. See -help for more information.")
+	}
+
+	if *recipient == "" {
+		log.Fatal("-recipient cannot be empty. See -help for more information.")
+	}
+
+	*document = strings.ToLower(*document)
+
+	url := fmt.Sprintf("https://www.ietf.org/rfc/%s.txt", *document)
+	resp, err := http.Get(url)
+	fmt.Printf("Downloading %s ... ", url)
+
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer resp.Body.Close()
+
+	f, err := ioutil.TempFile("", fmt.Sprintf("%s-*.txt", *document))
+	if err != nil {
+		log.Fatal(err)
+	}
+	// TODO: Verify if this is cleaning up or not.
+	defer os.Remove(f.Name())
+
+	_, err = io.Copy(f, resp.Body)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println("done.")
+
+	if *subject == "" {
+		*subject = fmt.Sprintf("%s - Sent from rfcToKindle.go", *document)
+	}
+
+	// Although I couldn't find it documented anywhere, the email sent to the
+	// Kindle must have a body, even if the body isn't used for anything.
+	fmt.Printf("Emailing %s to %s ... ", f.Name(), *recipient)
+	cmd := exec.Command("sendgmr",
+		fmt.Sprintf("--to=%s", *recipient),
+		fmt.Sprintf("--body_file=%s", f.Name()),
+		fmt.Sprintf("--subject=%s", *subject),
+		fmt.Sprintf("--attachment_files=%s", f.Name()))
+	err = cmd.Run()
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println("done.")
+
+	os.Exit(0)
+}

tools/run/.envrc

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+source_up
+eval "$(lorri direnv)"

tools/run/README.md

@@ -0,0 +1,30 @@
+# 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
+```

tools/run/default.nix

@@ -0,0 +1,16 @@
+{
+  pkgs ? import <nixpkgs> {},
+  depot ? import <depot> {},
+  briefcase ? import <briefcase> {},
+  ...
+}:
+
+depot.buildGo.program {
+  name = "run";
+  srcs = [
+    ./main.go
+  ];
+  deps = with briefcase.gopkgs; [
+    utils
+  ];
+}

tools/run/main.go

@@ -0,0 +1,49 @@
+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())
+}

tools/run/shell.nix

@@ -0,0 +1,7 @@
+{ pkgs ? import <nixpkgs> {}, ... }:
+
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    go
+  ];
+}

tools/symlinkManager/README.md

@@ -0,0 +1,14 @@
+# Dotfile Symlink Manager
+
+Find and delete all symlinks to the dotfiles defined in `$BRIEFCASE`.
+
+Oftentimes I corrupt the state of my configuration files. The intention with
+this script is to help me clean things up when this happens. An example workflow
+might look like:
+
+```shell
+> symlink-mgr --audit
+> symlink-mgr --seriously
+> briefcase # changes directory to $BRIEFCASE
+> make install
+```

tools/symlinkManager/default.nix

@@ -0,0 +1,15 @@
+{
+  depot ? import <depot> {},
+  briefcase ? import <briefcase> {},
+  ...
+}:
+
+depot.buildGo.program {
+  name = "symlink-mgr";
+  srcs = [
+    ./main.go
+  ];
+  deps = with briefcase.gopkgs; [
+    utils
+  ];
+}

tools/symlinkManager/main.go

@@ -0,0 +1,83 @@
+package main
+
+import (
+	"errors"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+	"utils"
+)
+
+var hostnames = map[string]string{
+	os.Getenv("DESKTOP"):  "desktop",
+	os.Getenv("LAPTOP"):   "work_laptop",
+	os.Getenv("CLOUDTOP"): "cloudtop",
+}
+
+func main() {
+	audit := flag.Bool("audit", false, "Output all symlinks that would be deleted. This is the default behavior. This option is mutually exclusive with the --seriously option.")
+	seriously := flag.Bool("seriously", false, "Actually delete the symlinks. This option is mutually exclusive with the --audit option.")
+	repoName := flag.String("repo-name", "briefcase", "The name of the repository.")
+	deviceOnly := flag.Bool("device-only", false, "Only output the device-specific dotfiles.")
+	flag.Parse()
+
+	if !*audit && !*seriously {
+		log.Fatal(errors.New("Either -audit or -seriously needs to be set."))
+	}
+	if *audit == *seriously {
+		log.Fatal(errors.New("Arguments -audit and -seriously are mutually exclusive"))
+	}
+
+	home, err := os.UserHomeDir()
+	utils.FailOn(err)
+	count := 0
+
+	err = filepath.Walk(home, func(path string, info os.FileInfo, err error) error {
+		if utils.IsSymlink(info.Mode()) {
+			dest, err := os.Readlink(path)
+			utils.FailOn(err)
+
+			var predicate func(string) bool
+
+			if *deviceOnly {
+				predicate = func(dest string) bool {
+					var hostname string
+					hostname, err = os.Hostname()
+					utils.FailOn(err)
+					seeking, ok := hostnames[hostname]
+					if !ok {
+						log.Fatal(fmt.Sprintf("Hostname \"%s\" not supported in the hostnames map.", hostname))
+					}
+					return strings.Contains(dest, *repoName) && strings.Contains(dest, seeking)
+				}
+			} else {
+				predicate = func(dest string) bool {
+					return strings.Contains(dest, *repoName)
+				}
+			}
+
+			if predicate(dest) {
+				if *audit {
+					fmt.Printf("%s -> %s\n", path, dest)
+				} else if *seriously {
+					fmt.Printf("rm %s\n", path)
+					err = os.Remove(path)
+					utils.FailOn(err)
+				}
+				count += 1
+			}
+		}
+		return nil
+	})
+	utils.FailOn(err)
+	if *audit {
+		fmt.Printf("Would have deleted %d symlinks.\n", count)
+	} else if *seriously {
+		fmt.Printf("Successfully deleted %d symlinks.\n", count)
+	}
+
+	os.Exit(0)
+}