From d7911efd06eb421d05ade22bb943bce9dd5c14d7 Mon Sep 17 00:00:00 2001 From: Lukas Wurzinger Date: Wed, 11 Dec 2024 04:37:30 +0100 Subject: [PATCH] init --- .envrc | 3 + .gitignore | 6 ++ LICENSE | 201 ++++++++++++++++++++++++++++++++++++++++++++++++++++ devenv.lock | 116 ++++++++++++++++++++++++++++++ devenv.nix | 14 ++++ devenv.yaml | 4 ++ go.mod | 3 + tplx.go | 118 ++++++++++++++++++++++++++++++ 8 files changed, 465 insertions(+) create mode 100644 .envrc create mode 100644 .gitignore create mode 100644 LICENSE create mode 100644 devenv.lock create mode 100644 devenv.nix create mode 100644 devenv.yaml create mode 100644 go.mod create mode 100644 tplx.go diff --git a/.envrc b/.envrc new file mode 100644 index 0000000..894571b --- /dev/null +++ b/.envrc @@ -0,0 +1,3 @@ +source_url "https://raw.githubusercontent.com/cachix/devenv/82c0147677e510b247d8b9165c54f73d32dfd899/direnvrc" "sha256-7u4iDd1nZpxL4tCzmPG0dQgC5V+/44Ba+tHkPob1v2k=" + +use devenv diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..5f8f5e4 --- /dev/null +++ b/.gitignore @@ -0,0 +1,6 @@ +.devenv* +devenv.local.nix + +.direnv/ + +.pre-commit-config.yaml diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..261eeb9 --- /dev/null +++ b/LICENSE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. diff --git a/devenv.lock b/devenv.lock new file mode 100644 index 0000000..8ab1706 --- /dev/null +++ b/devenv.lock @@ -0,0 +1,116 @@ +{ + "nodes": { + "devenv": { + "locked": { + "dir": "src/modules", + "lastModified": 1733788855, + "owner": "cachix", + "repo": "devenv", + "rev": "d59fee8696cd48f69cf79f65992269df9891ba86", + "type": "github" + }, + "original": { + "dir": "src/modules", + "owner": "cachix", + "repo": "devenv", + "type": "github" + } + }, + "flake-compat": { + "flake": false, + "locked": { + "lastModified": 1733328505, + "owner": "edolstra", + "repo": "flake-compat", + "rev": "ff81ac966bb2cae68946d5ed5fc4994f96d0ffec", + "type": "github" + }, + "original": { + "owner": "edolstra", + "repo": "flake-compat", + "type": "github" + } + }, + "gitignore": { + "inputs": { + "nixpkgs": [ + "pre-commit-hooks", + "nixpkgs" + ] + }, + "locked": { + "lastModified": 1709087332, + "owner": "hercules-ci", + "repo": "gitignore.nix", + "rev": "637db329424fd7e46cf4185293b9cc8c88c95394", + "type": "github" + }, + "original": { + "owner": "hercules-ci", + "repo": "gitignore.nix", + "type": "github" + } + }, + "nixpkgs": { + "locked": { + "lastModified": 1733477122, + "owner": "cachix", + "repo": "devenv-nixpkgs", + "rev": "7bd9e84d0452f6d2e63b6e6da29fe73fac951857", + "type": "github" + }, + "original": { + "owner": "cachix", + "ref": "rolling", + "repo": "devenv-nixpkgs", + "type": "github" + } + }, + "nixpkgs-stable": { + "locked": { + "lastModified": 1733730953, + "owner": "NixOS", + "repo": "nixpkgs", + "rev": "7109b680d161993918b0a126f38bc39763e5a709", + "type": "github" + }, + "original": { + "owner": "NixOS", + "ref": "nixos-24.05", + "repo": "nixpkgs", + "type": "github" + } + }, + "pre-commit-hooks": { + "inputs": { + "flake-compat": "flake-compat", + "gitignore": "gitignore", + "nixpkgs": [ + "nixpkgs" + ], + "nixpkgs-stable": "nixpkgs-stable" + }, + "locked": { + "lastModified": 1733665616, + "owner": "cachix", + "repo": "pre-commit-hooks.nix", + "rev": "d8c02f0ffef0ef39f6063731fc539d8c71eb463a", + "type": "github" + }, + "original": { + "owner": "cachix", + "repo": "pre-commit-hooks.nix", + "type": "github" + } + }, + "root": { + "inputs": { + "devenv": "devenv", + "nixpkgs": "nixpkgs", + "pre-commit-hooks": "pre-commit-hooks" + } + } + }, + "root": "root", + "version": 7 +} diff --git a/devenv.nix b/devenv.nix new file mode 100644 index 0000000..0c2cafe --- /dev/null +++ b/devenv.nix @@ -0,0 +1,14 @@ +{ + languages.go.enable = true; + + pre-commit.hooks = { + # Go + gotest.enable = true; + golangci-lint.enable = true; + + # Nix + alejandra.enable = true; + deadnix.enable = true; + statix.enable = true; + }; +} diff --git a/devenv.yaml b/devenv.yaml new file mode 100644 index 0000000..68616a4 --- /dev/null +++ b/devenv.yaml @@ -0,0 +1,4 @@ +# yaml-language-server: $schema=https://devenv.sh/devenv.schema.json +inputs: + nixpkgs: + url: github:cachix/devenv-nixpkgs/rolling diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..3c65eb8 --- /dev/null +++ b/go.mod @@ -0,0 +1,3 @@ +module github.com/lukaswrz/tplx + +go 1.23.3 diff --git a/tplx.go b/tplx.go new file mode 100644 index 0000000..70cdd36 --- /dev/null +++ b/tplx.go @@ -0,0 +1,118 @@ +// Package tplx wraps the standard html/template library to provide a little more +// structure and ease of use. +package tplx + +import ( + "errors" + "fmt" + "html/template" + "io" + "io/fs" +) + +var ( + // ErrUnknownTemplate is returned when a template is not found in the renderer. + ErrUnknownTemplate = errors.New("template not found in renderer") + + // ErrInvalidSpec is returned when the template renderer specification is invalid. + ErrInvalidSpec = errors.New("template renderer spec is invalid") +) + +// Renderer is an interface for rendering templates. +// +// Render writes the output of the specified template to the provided writer. The +// name parameter specifies the template to execute, data provides the context +// data for the template, and funcs provides additional template functions. +type Renderer interface { + Render(w io.Writer, name string, data any, funcs template.FuncMap) error +} + +type renderer struct { + m map[string]*template.Template +} + +// Spec describes the structure of all templates managed by the renderer. +// +// The keys of the Spec map represent top-level template names. Each key maps +// to a slice of Meta, where each Meta defines the name, path, and functions +// associated with a template fragment. +type Spec map[string][]Meta + +// Meta represents metadata for a single template fragment. +// +// Name specifies the name of the template fragment. Path specifies the path to +// the template file in the file system. Funcs provides template-specific +// functions. +type Meta struct { + Name string + Path string + Funcs template.FuncMap +} + +// NewRenderer creates a new Renderer instance from a file system, specification, +// and global function map. +// +// The fsys parameter specifies the file system from which template files are +// loaded. The spec parameter defines the structure of the templates, mapping +// top-level template names to their fragments. The funcs parameter provides +// global template functions. +// +// Returns a Renderer instance or an error if the templates cannot be initialized +// according to the specification. +func NewRenderer(fsys fs.FS, spec Spec, funcs template.FuncMap) (Renderer, error) { + r := renderer{ + m: make(map[string]*template.Template, len(spec)), + } + + for name, pairs := range spec { + inc := false + + t := template.New(name).Funcs(funcs) + + for _, pair := range pairs { + if pair.Name == name { + inc = true + } + + text, err := fs.ReadFile(fsys, pair.Path) + if err != nil { + return nil, fmt.Errorf("unable to read template file: %w", err) + } + + t = t.New(pair.Name).Funcs(pair.Funcs) + + t, err = t.Parse(string(text)) + if err != nil { + return nil, err + } + } + + if !inc { + return nil, ErrInvalidSpec + } + + r.m[name] = t + } + + return r, nil +} + +// Render writes the rendered output of a named template to the provided writer. +// +// The wr parameter specifies the writer where the rendered template output will +// be written. The name parameter specifies the name of the template to render +// The data parameter provides the context data for rendering, and the funcs +// parameter provides additional template functions. +// +// Returns an error if the template cannot be rendered or does not exist. +func (r renderer) Render(wr io.Writer, name string, data any, funcs template.FuncMap) error { + t, ok := r.m[name] + if !ok { + return ErrUnknownTemplate + } + err := t.ExecuteTemplate(wr, name, data) + if err != nil { + return fmt.Errorf("cannot render template: %w", err) + } + return nil +}