add command flags

cmd/gi_gen.go

@@ -1,6 +1,8 @@
 package cmd
 
 import (
+	"flag"
+	"fmt"
 	"log"
 	"os"
 	"path/filepath"
@@ -9,20 +11,57 @@ import (
 )
 
 func RunMainCmd() {
+	helpCommand()
+
+	shouldReturn := cleanCommand()
+	if shouldReturn {
+		return
+	}
+
+	RunGIGen()
+}
+
+func cleanCommand() bool {
+	var clean *bool = flag.Bool("cache-clean", false, "Clear the .gitignore cache directory, for troubleshooting or for removing trace files of this program.")
+	flag.Parse()
+
+	if *clean {
+		RemoveCacheDir()
+		return true
+	}
+	return false
+}
+
+func helpCommand() {
+	flag.Usage = func() {
+		w := flag.CommandLine.Output()
+
+		fmt.Fprint(w, "Usage: gi_gen [options]\n\n")
+		fmt.Fprint(w, "This program generates .gitignore files for any project. You may clean unused\nlines from the generated file, and the program auto-discovers relevant\n.gitignore templates unless asked not to when the prompt appears.\n\n")
+		fmt.Fprint(w, "Run without arguments to use the normal functionality of gi_gen.\n\n")
+		fmt.Fprint(w, "Available flags:\n\n")
+		flag.PrintDefaults()
+		fmt.Fprintf(w, "\nCopyright © 2022 - Chen Asraf\nhttps://casraf.blog\nhttps://github.com/chenasraf/gi_gen\n")
+	}
+
+	flag.Bool("help", false, "Display help message")
+}
+
+func RunGIGen() {
 	wd, err := os.Getwd()
 	HandleErr(err)
 
 	outFile := filepath.Join(wd, ".gitignore")
 	allFiles, err := PrepareGitignores()
 	HandleErr(err)
 
-	fileNames, files := GetRelevantFiles(allFiles)
+	fileNames, files := DiscoverRelevantFiles(allFiles)
 
 	log.Println("Done.")
 
 	selected, selectedKeys := GetLanguageSelections(files, fileNames)
-	cleanupSelection := GetCleanupSelection()
-	outContents := Ternary(cleanupSelection, CleanupMultiple(selected, selectedKeys), GetAllRaw(selected, selectedKeys))
+	cleanupSelection := AskCleanup()
+	outContents := Ternary(cleanupSelection, CleanupMultipleFiles(selected, selectedKeys), GetAllRaw(selected, selectedKeys))
 
 	if FileExists(outFile) {
 		HandleFileOverwrite(outFile, outContents)

internal/core.go → internal/ask.go

@@ -2,50 +2,10 @@ package internal
 
 import (
 	"fmt"
-	"log"
-	"os"
 
 	"github.com/AlecAivazis/survey/v2"
 )
 
-func HandleFileOverwrite(path string, contents string) {
-	overwriteSelection := AskOverwrite()
-	switch overwriteSelection {
-	case "":
-		Quit()
-		break
-	case "Overwrite":
-		log.Printf("Writing to %s", path)
-		WriteFile(path, contents, true)
-		break
-	case "Append":
-		log.Printf("Appending to %s", path)
-		WriteFile(path, contents, false)
-		break
-	}
-}
-
-func AskOverwrite() string {
-	overwritePrompt := &survey.Select{
-		Message: ".gitignore file found in this directory. Please pick an option:",
-		Options: []string{"Overwrite", "Append", "Skip"},
-	}
-	overwriteSelection := ""
-	survey.AskOne(overwritePrompt, &overwriteSelection)
-	return overwriteSelection
-}
-
-func GetCleanupSelection() bool {
-	cleanupPrompt := &survey.Confirm{
-		Message: "Do you want to remove patterns not existing in your project?",
-		Default: true,
-	}
-
-	var cleanupSelection bool
-	survey.AskOne(cleanupPrompt, &cleanupSelection)
-	return cleanupSelection
-}
-
 func AskLanguage(fileNames []string, selected []string, files map[string]string) ([]string, []string) {
 	langPrompt := &survey.MultiSelect{
 		Message: "Found " + fmt.Sprint(len(fileNames)) +
@@ -79,6 +39,23 @@ func AskDiscovery() bool {
 	return answer
 }
 
-func Quit() {
-	os.Exit(1)
+func AskOverwrite() string {
+	overwritePrompt := &survey.Select{
+		Message: ".gitignore file found in this directory. Please pick an option:",
+		Options: []string{"Overwrite", "Append", "Skip"},
+	}
+	overwriteSelection := ""
+	survey.AskOne(overwritePrompt, &overwriteSelection)
+	return overwriteSelection
+}
+
+func AskCleanup() bool {
+	cleanupPrompt := &survey.Confirm{
+		Message: "Do you want to remove patterns not existing in your project?\nThis might produce incomplete files on new projects.",
+		Default: false,
+	}
+
+	var cleanupSelection bool
+	survey.AskOne(cleanupPrompt, &cleanupSelection)
+	return cleanupSelection
 }

internal/ignore_files.go

@@ -17,16 +17,21 @@ func PrepareGitignores() ([]string, error) {
 	if !FileExists(gitignoresDir) {
 		log.Println("Getting gitignore files...")
 		RunCmd("git", "clone", "--depth=1", repoUrl, gitignoresDir)
-	}
-
-	if GetNeedsUpdate() {
+	} else if GetNeedsUpdate() {
 		log.Println("Updating gitignore files...")
 		RunCmd("git", "-C", gitignoresDir, "pull", "origin", "master")
 	}
 
 	return GetGitignores(gitignoresDir)
 }
 
+func RemoveCacheDir() {
+	cacheDir := GetCacheDir()
+	log.Printf("Removing cache directory: %s...\n", cacheDir)
+	os.RemoveAll(cacheDir)
+	log.Println("Done")
+}
+
 func GetCacheDir() string {
 	homeDir, _ := os.UserHomeDir()
 	return filepath.Join(homeDir, ".github.gitignore")
@@ -75,10 +80,12 @@ func FindFileMatches(patterns string) bool {
 			continue
 		}
 		idx := strings.Index(line, "#")
+
 		// ignore comments at end of line
 		if idx > -1 && (idx == 0 || line[idx-1] != '\\') {
 			line = strings.TrimSpace(line[0:idx])
 		}
+
 		if len(line) == 0 || Contains(ignoreLines, line) {
 			continue
 		}
@@ -166,7 +173,7 @@ func GetLanguageSelections(files map[string]string, fileNames []string) ([]strin
 	return selected, selectedKeys
 }
 
-func GetRelevantFiles(allFiles []string) ([]string, map[string]string) {
+func DiscoverRelevantFiles(allFiles []string) ([]string, map[string]string) {
 	files := make(map[string]string)
 	fileNames := []string{}
 
@@ -199,20 +206,20 @@ func LangHeader(langName string) string {
 
 func GetAllRaw(selected []string, selectedKeys []string) string {
 	for i, selection := range selected {
-		header := LangHeader(selectedKeys[i])
+		header := Ternary(len(selected) > 1, LangHeader(selectedKeys[i]), "")
 		selected[i] = header + selection
 	}
 	return strings.Join(selected, "\n")
 }
 
-func CleanupMultiple(selected []string, keys []string) string {
+func CleanupMultipleFiles(files []string, langKeys []string) string {
 	out := []string{}
-	for i, selection := range selected {
+	for i, selection := range files {
 		cleanSelection := RemoveUnusedPatterns(selection)
 		if strings.TrimSpace(cleanSelection) == "" {
 			continue
 		}
-		header := LangHeader(keys[i])
+		header := LangHeader(langKeys[i])
 		prefixNewline := Ternary(i > 0, "\n", "")
 		contents := prefixNewline + header + cleanSelection
 		out = append(out, contents)

internal/utils.go

@@ -82,3 +82,24 @@ func Ternary[T any](cond bool, whenTrue T, whenFalse T) T {
 func ToString[T any](obj T) string {
 	return fmt.Sprint(obj)
 }
+
+func HandleFileOverwrite(path string, contents string) {
+	overwriteSelection := AskOverwrite()
+	switch overwriteSelection {
+	case "":
+		Quit()
+		break
+	case "Overwrite":
+		log.Printf("Writing to %s", path)
+		WriteFile(path, contents, true)
+		break
+	case "Append":
+		log.Printf("Appending to %s", path)
+		WriteFile(path, contents, false)
+		break
+	}
+}
+
+func Quit() {
+	os.Exit(1)
+}