Initial commit

.gitignore

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+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+
+# By Reza
+build/
+.archive/
+.vagrant/
+.env
+*_[0-9]
+*_[0-9][0-9]
+*_????-??-??
+*.zip
+

.goreleaser.yml

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+project_name: minitmpl
+
+builds:
+  - env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - darwin
+      - windows
+    goarch:
+      - amd64
+      - arm64
+
+# If you want to push the release to GitHub, configure the GitHub section.
+# You'll need a GitHub token with repo access stored in your environment as GITHUB_TOKEN.
+release:
+  # github:
+  #   owner: yourgithubusername
+  #   name: yourrepositoryname
+  gitea:
+    owner: p
+    name: minitmpl
+    url: https://git.behzadan.ir
+    token: "{{ .Env.GITEA_TOKEN }}" # Use the GITEA_TOKEN environment variable
+
+# If you want to create archives (tar.gz for Linux/Darwin, zip for Windows)
+archives:
+  - format: tar.gz
+    format_overrides:
+      - goos: windows
+        format: zip
+    files:
+      - LICENSE
+      - README.md
+

LICENSE

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+Copyright (c) 2024, Reza Behzadan
+
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this list of conditions, and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions, and the following disclaimer in the documentation and/or other materials provided with the distribution.
+
+3. The name of "Reza Behzadan" may not be used to endorse or promote products derived from this software without specific prior written permission.
+
+4. Modified versions of the software must be distributed under the same terms and conditions of this license, and the original name of "Reza Behzadan" must be credited as the original developer in any significant portions of the redistributed or modified code.
+
+5. The software, including any modified versions, must not be used, directly or indirectly, in any type of military project or in any project that may cause harm to any human being.
+
+6. The software, including any modified versions, must not be used, directly or indirectly, by any individual, organization, or entity involved in or supporting oppressive, totalitarian regimes, or in any project that supports such regimes or contributes to human rights violations. This includes, but is not limited to, entities known for systematic oppression, cruelty, and use of violence against defenseless individuals, or for supporting terrorism.
+
+
+DISCLAIMER:
+
+THIS SOFTWARE IS PROVIDED BY REZA BEHZADAN "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL REZA BEHZADAN BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+

go.mod

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+module git.behzadan.ir/p/minitmpl
+
+go 1.22.0

main.go

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+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+	"text/template"
+)
+
+const version = "1.0.0"
+
+func printHelp() {
+	helpText := fmt.Sprintf(`
+Usage: %s [OPTIONS]
+
+This program reads a text template from stdin and uses environment variables to render it.
+
+Options:
+  -v      Prints the version of the program.
+  -h      Prints this help message.
+
+Example:
+  echo "Hello, {{.USER}}" | %s
+`, os.Args[0], os.Args[0])
+	fmt.Print(helpText)
+}
+
+func main() {
+	// Define and parse flags
+	versionFlag := flag.Bool("v", false, "Prints the version of the program")
+	helpFlag := flag.Bool("h", false, "Prints the help message")
+	flag.Parse()
+
+	// Handle version flag
+	if *versionFlag {
+		fmt.Println("Version:", version)
+		os.Exit(0)
+	}
+
+	// Handle help flag
+	if *helpFlag {
+		printHelp()
+		os.Exit(0)
+	}
+
+	// Define custom functions
+	customFunctions := template.FuncMap{
+		"title": func(s string) string { return strings.Title(s) },
+	}
+
+	// Create a new template.
+	tmpl, err := template.New("template").Funcs(customFunctions).Parse(readInput())
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error parsing template: %v\n", err)
+		os.Exit(1)
+	}
+
+	// Create a map to hold environment variables.
+	envVars := make(map[string]string)
+
+	// Populate the map with the current environment variables.
+	for _, env := range os.Environ() {
+		pair := strings.SplitN(env, "=", 2)
+		if len(pair) == 2 {
+			envVars[pair[0]] = pair[1]
+		}
+	}
+
+	// Execute the template with the environment variables map.
+	if err := tmpl.Execute(os.Stdout, envVars); err != nil {
+		fmt.Fprintf(os.Stderr, "Error executing template: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+// readInput reads from stdin until EOF and returns the input as a string.
+func readInput() string {
+	scanner := bufio.NewScanner(os.Stdin)
+	var input string
+	for scanner.Scan() {
+		input += scanner.Text() + "\n"
+	}
+	if err := scanner.Err(); err != nil {
+		fmt.Fprintf(os.Stderr, "Error reading input: %v\n", err)
+		os.Exit(1)
+	}
+	return input
+}

main_test.go

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+package main
+
+import (
+	"io"
+	"os"
+	"strings"
+	"testing"
+)
+
+// TestTemplateRendering tests rendering a template using an environment variable.
+func TestTemplateRendering(t *testing.T) {
+	// Backup the original stdin and stdout
+	origStdin := os.Stdin
+	origStdout := os.Stdout
+
+	// Create a pipe to simulate stdin
+	tempStdin, tempStdinFile, err := os.Pipe()
+	if err != nil {
+		t.Fatalf("Failed to create pipe for stdin: %v", err)
+	}
+	os.Stdin = tempStdin
+
+	// Create a pipe to capture stdout
+	tempStdoutRead, tempStdoutWrite, err := os.Pipe()
+	if err != nil {
+		t.Fatalf("Failed to create pipe for stdout: %v", err)
+	}
+	os.Stdout = tempStdoutWrite
+
+	// Set environment variable for the test
+	os.Setenv("USER", "testuser")
+	defer func() {
+		// Cleanup: Restore stdin, stdout and unset the environment variable
+		os.Stdin = origStdin
+		os.Stdout = origStdout
+		os.Unsetenv("USER")
+		tempStdoutWrite.Close()
+	}()
+
+	// Write the template to the tempStdinFile, simulating input
+	input := "Hello, {{.USER}}!"
+	go func() {
+		tempStdinFile.Write([]byte(input))
+		tempStdinFile.Close()
+	}()
+
+	// Run the program (assuming main does the reading, processing, and printing)
+	main()
+
+	// Close write end of stdout pipe to finish reading from it
+	tempStdoutWrite.Close()
+
+	// Read the output from the captured stdout
+	output, err := io.ReadAll(tempStdoutRead)
+	if err != nil {
+		t.Fatalf("Failed to read captured stdout: %v", err)
+	}
+
+	// Verify the output
+	expectedOutput := "Hello, testuser!"
+	if !strings.Contains(string(output), expectedOutput) {
+		t.Errorf("Expected output to contain %q, got %q instead", expectedOutput, output)
+	}
+}

samples/nginx_site.tmpl

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+server {
+    listen 80;
+    server_name {{.fqdn}};
+    server_tokens off;
+    return 301 https://{{.fqdn}}$request_uri;
+}
+
+server {
+    server_name {{.fqdn}};
+    listen 443 ssl http2;
+    ssl_certificate /etc/nginx/certs/{{.fqdn}}/cert.pem;
+    ssl_certificate_key /etc/nginx/certs/{{.fqdn}}/key.pem;
+    server_tokens off;
+
+    location / {
+        root {{.root}};
+        try_files $uri $uri/ =404;
+        autoindex off;
+    }
+
+}