feat: derive template name
Signed-off-by: jolheiser <john.olheiser@gmail.com>pull/27/head
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FAQ.md
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FAQ.md
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# tmpl templates
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This documentation aims to cover FAQs and setup.
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## Setting up a template
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A "valid" tmpl template only requires two things
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1. A `tmpl.yaml` file in the root directory.
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2. A `template` directory that serves as the "root" of the template.
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## tmpl.yaml
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**NOTE:** The tmpl.yaml file will be expanded, though not with the full power of the template itself.
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The tmpl.yaml file will only expand environment variables with syntax `$USER` or `${USER}`.
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For full documentation on the syntax, see [os.ExpandEnv](https://golang.org/pkg/os/#ExpandEnv).
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When using the `--defaults` flag, no prompts will be shown and only default values will be used.
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As another alternative, any environment variable that matches a key will bypass the prompt.
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For example, `author` would have the corresponding environment variable `TMPL_VAR_AUTHOR`.
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```yaml
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# tmpl.yaml
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# Write any template args here to prompt the user for, giving any defaults/options as applicable
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prompts:
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- id: project # The unique ID for the prompt
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label: Project Name # The prompt message/label
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help: The name to use in the project # Optional help message for the prompt
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default: tmpl # Prompt default
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```
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## template directory
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This directory contains any and all files that are part of the template.
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Everything in this directory (including paths and file names!) will be executed as a [Go template](https://golang.org/pkg/text/template/).
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See the [documentation](https://golang.org/pkg/text/template/) for every available possibility, but some basic examples are...
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* An id defined in `tmpl.yaml` (tmpl allows for keys to be called as a func or variable, whichever you prefer!)
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* `{{project}}` or `{{.project}}`
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* `{{author}}` or `{{.author}}`
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* Conditionally including something
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* `{{if eq project ""}} something... {{end}}`
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### template helpers
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For a full list, see [helper.go](registry/helper.go)
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| Helper | Example | Output |
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|-------------|------------------------------------|-------------------------------------------------------------------------------------------------------|
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| upper | `{{upper project}}` | `MY-PROJECT` |
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| lower | `{{lower project}}` | `my-project` |
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| title | `{{title project}}` | `My-Project` |
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| snake | `{{snake project}}` | `my_project` |
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| kebab | `{{kebab project}}` | `my-project` |
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| pascal | `{{pascal project}}` | `MyProject` |
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| camel | `{{camel project}}` | `myProject` |
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| env | `{{env "USER"}}` | The current user |
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| sep | `{{sep}}` | Filepath separator for current OS |
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| time | `{{time "01/02/2006"}}` | `11/21/2020` - The time according to the given [format](https://flaviocopes.com/go-date-time-format/) |
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| trim_prefix | `{{trim_prefix "foobar" "foo"}}` | `bar` |
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| trim_suffix | `{{trim_suffix "foobar" "bar"}}` | `foo` |
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| replace | `{{replace "foobar" "bar" "baz"}}` | `foobaz` |
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## Sources
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tmpl was designed to work with any local or git-based template. Unfortunately, in contrast to boilr, this means
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it cannot be used with `user/repo` notation out of the box.
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However, you _can_ set up a source (and subsequent env variable) to make it easier to use your preferred source while
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still allowing for others.
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### Setting up a source
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Let's set up a source for [Gitea](https://gitea.com)
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```
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tmpl source add https://gitea.com gitea
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```
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To use it, either pass it in with the `--source` flag
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```
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tmpl --source gitea download jolheiser/tmpls tmpls
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```
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Or set it as the env variable `TMPL_SOURCE`
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## Using a different branch
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By default, tmpl will want to use a branch called `main` in your repository.
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If you are using another branch as your default, you can set it as the env variable `TMPL_BRANCH`
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Alternatively, you can specify on the command-line with the `--branch` flag of the `download` command
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```
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tmpl --source gitea download --branch license jolheiser/tmpls license
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```
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The above command would download the [license](https://git.jojodev.com/jolheiser/tmpls/src/branch/license) template from `jolheiser/tmpls`
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## Putting it all together
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I realize that many users will be using GitHub, and most will likely still be using the `master` branch.
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1. Set up a source for GitHub
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1. `tmpl source add https://github.com github`
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2. Set the env variable `TMPL_SOURCE` to `github`
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2. Set the env variable `TMPL_BRANCH` to `master`
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3. Happy templating! `tmpl download user/repo repo`
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## Backup and Restore
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1. The simplest solution is to make a copy of your `registry.toml` (default: `~/.tmpl/registry.toml`).
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* Once in the new location, you will need to use `tmpl restore`.
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2. Alternatively, you can copy/paste the entire registry (default: `~/.tmpl`) and skip the restore step.
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## `.tmplkeep`
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Perhaps you are familiar with `.gitkeep` and its unofficial status in git. Git does not like empty directories, so usually
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a `.gitkeep` (or just `.keep`) file is added to retain the directory while keeping it effectively empty.
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tmpl instead uses `.tmplkeep` files for this purpose. The difference is, tmpl will **not** create the `.tmplkeep` file
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when the template is executed. This allows you to set up directory structures (for staging, examples, etc.) that
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will *actually* be empty after execution.
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@ -2,6 +2,8 @@ package cmd
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import (
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"fmt"
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"os"
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"path"
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"strings"
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"go.jolheiser.com/tmpl/env"
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@ -15,7 +17,7 @@ var Download = &cli.Command{
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Name: "download",
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Usage: "Download a template",
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Description: "Download a template and save it to the local registry",
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ArgsUsage: "[repository URL] [name]",
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ArgsUsage: "[repository URL] <name>",
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Flags: []cli.Flag{
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&cli.StringFlag{
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Name: "branch",
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@ -29,7 +31,7 @@ var Download = &cli.Command{
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}
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func runDownload(ctx *cli.Context) error {
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if ctx.NArg() < 2 {
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if ctx.NArg() < 1 {
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return cli.ShowCommandHelp(ctx, ctx.Command.Name)
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}
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@ -67,7 +69,7 @@ func runDownload(ctx *cli.Context) error {
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cloneURL += ".git"
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}
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t, err := reg.DownloadTemplate(ctx.Args().Get(1), cloneURL, ctx.String("branch"))
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t, err := reg.DownloadTemplate(deriveName(ctx), cloneURL, ctx.String("branch"))
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if err != nil {
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return err
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}
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@ -75,3 +77,19 @@ func runDownload(ctx *cli.Context) error {
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log.Info().Msgf("Added new template %q", t.Name)
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return nil
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}
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func deriveName(ctx *cli.Context) string {
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if ctx.NArg() > 1 {
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return ctx.Args().Get(1)
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}
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envBranch, envSet := os.LookupEnv("TMPL_BRANCH")
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flagBranch, flagSet := ctx.String("branch"), ctx.IsSet("branch")
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if flagSet {
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if !envSet || envBranch != flagBranch {
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return flagBranch
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}
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}
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return path.Base(ctx.Args().First())
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}
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