feature: Skip unstaged changes for pre-commit hook (#402)

.golangci.yml

@@ -9,36 +9,50 @@ linters-settings:
 linters:
   disable-all: true
   enable:
-   - bodyclose
-   - depguard
-   - dogsled
-   - dupl
-   - errcheck
-   - exhaustive
-   - exportloopref
-   - gci
-   - goconst
-   - gocyclo
-   - gocyclo
-   - godot
-   - godox
-   - gofmt
-   - gofumpt
-   - goimports
-   - gomnd
-   - goprintffuncname
-   - gosimple
-   - govet
-   - ineffassign
-   - misspell
-   - nakedret
-   - nestif
-   - noctx
-   - nolintlint
-   - revive
-   - staticcheck
-   - typecheck
-   - unconvert
-   - unparam
-   - unused
-   - whitespace
+    - asasalint
+    - asciicheck
+    - bidichk
+    - bodyclose
+    - containedctx
+    - contextcheck
+    - decorder
+    - depguard
+    - dogsled
+    - dupl
+    - dupword
+    - durationcheck
+    - errcheck
+    - errchkjson
+    - errname
+    - errorlint
+    - exhaustive
+    - exportloopref
+    - forbidigo
+    - gci
+    - gochecknoinits
+    - goconst
+    - gocritic
+    - gocyclo
+    - godot
+    - godox
+    - gofmt
+    - gofumpt
+    - goheader
+    - goimports
+    - gomnd
+    - goprintffuncname
+    - gosimple
+    - govet
+    - ineffassign
+    - misspell
+    - nakedret
+    - nestif
+    - noctx
+    - nolintlint
+    - revive
+    - staticcheck
+    - typecheck
+    - unconvert
+    - unparam
+    - unused
+    - whitespace

internal/config/available_hooks.go

@@ -39,6 +39,10 @@ var AvailableHooks = [...]string{
 	"sendemail-validate",
 }
 
+func HookUsesStagedFiles(hook string) bool {
+	return hook == "pre-commit"
+}
+
 func HookAvailable(hook string) bool {
 	for _, name := range AvailableHooks {
 		if name == hook {

internal/config/command.go

@@ -96,7 +96,7 @@ func mergeCommands(base, extra *viper.Viper) (map[string]*Command, error) {
 
 	for key, replace := range runReplaces {
 		if replace.Run != "" {
-			commands[key].Run = strings.Replace(commands[key].Run, CMD, replace.Run, -1)
+			commands[key].Run = strings.ReplaceAll(commands[key].Run, CMD, replace.Run)
 		}
 	}
 

internal/config/load.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"errors"
 	"fmt"
 	"path/filepath"
 	"regexp"
@@ -82,7 +83,8 @@ func mergeAll(fs afero.Fs, repo *git.Repository) (*viper.Viper, error) {
 	}
 
 	if err := merge("lefthook-local", "", extends); err != nil {
-		if _, notFoundErr := err.(viper.ConfigFileNotFoundError); !notFoundErr {
+		var notFoundErr viper.ConfigFileNotFoundError
+		if ok := errors.As(err, &notFoundErr); !ok {
 			return nil, err
 		}
 	}

internal/config/load_test.go

@@ -416,11 +416,9 @@ pre-push:
 
 			if err != nil {
 				t.Errorf("should parse configs without errors: %s", err)
-			} else {
-				if !cmp.Equal(checkConfig, tt.result, cmpopts.IgnoreUnexported(Hook{})) {
-					t.Errorf("configs should be equal")
-					t.Errorf("(-want +got):\n%s", cmp.Diff(tt.result, checkConfig))
-				}
+			} else if !cmp.Equal(checkConfig, tt.result, cmpopts.IgnoreUnexported(Hook{})) {
+				t.Errorf("configs should be equal")
+				t.Errorf("(-want +got):\n%s", cmp.Diff(tt.result, checkConfig))
 			}
 		})
 	}

internal/config/script.go

@@ -78,7 +78,7 @@ func mergeScripts(base, extra *viper.Viper) (map[string]*Script, error) {
 
 	for key, replace := range runReplaces {
 		if replace.Runner != "" {
-			scripts[key].Runner = strings.Replace(scripts[key].Runner, CMD, replace.Runner, -1)
+			scripts[key].Runner = strings.ReplaceAll(scripts[key].Runner, CMD, replace.Runner)
 		}
 	}
 

internal/git/exec.go

@@ -0,0 +1,68 @@
+package git
+
+import (
+	"os"
+	"os/exec"
+	"strings"
+)
+
+type Exec interface {
+	Cmd(cmd string) (string, error)
+	CmdArgs(args ...string) (string, error)
+	CmdLines(cmd string) ([]string, error)
+	RawCmd(cmd string) (string, error)
+}
+
+type OsExec struct{}
+
+// NewOsExec returns an object that executes given commands
+// in the OS.
+func NewOsExec() *OsExec {
+	return &OsExec{}
+}
+
+// Cmd runs plain string command. Trims spaces around output.
+func (o *OsExec) Cmd(cmd string) (string, error) {
+	args := strings.Split(cmd, " ")
+	return o.CmdArgs(args...)
+}
+
+// CmdLines runs plain string command, returns its output split by newline.
+func (o *OsExec) CmdLines(cmd string) ([]string, error) {
+	out, err := o.RawCmd(cmd)
+	if err != nil {
+		return nil, err
+	}
+
+	return strings.Split(out, "\n"), nil
+}
+
+// CmdArgs runs a command provided with separted words. Trims spaces around output.
+func (o *OsExec) CmdArgs(args ...string) (string, error) {
+	out, err := o.rawExecArgs(args...)
+	if err != nil {
+		return "", err
+	}
+
+	return strings.TrimSpace(out), nil
+}
+
+// RawCmd runs a plain string command returning unprocessed output as string.
+func (o *OsExec) RawCmd(cmd string) (string, error) {
+	args := strings.Split(cmd, " ")
+	return o.rawExecArgs(args...)
+}
+
+// rawExecArgs executes git command with LEFTHOOK=0 in order
+// to prevent calling subsequent lefthook hooks.
+func (o *OsExec) rawExecArgs(args ...string) (string, error) {
+	cmd := exec.Command(args[0], args[1:]...)
+	cmd.Env = append(os.Environ(), "LEFTHOOK=0")
+
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return "", err
+	}
+
+	return string(out), nil
+}

internal/git/remote.go

@@ -68,20 +68,22 @@ func (r *Repository) updateRemote(path, ref string) error {
 	log.Debugf("Updating remote config repository: %s", path)
 
 	if len(ref) != 0 {
-		cmdFetch := []string{"git", "-C", path, "fetch", "--quiet", "--depth", "1", "origin", ref}
-		_, err := execGit(strings.Join(cmdFetch, " "))
+		_, err := r.Git.CmdArgs(
+			"git", "-C", path, "fetch", "--quiet", "--depth", "1",
+			"origin", ref,
+		)
 		if err != nil {
 			return err
 		}
 
-		cmdFetch = []string{"git", "-C", path, "checkout", "FETCH_HEAD"}
-		_, err = execGit(strings.Join(cmdFetch, " "))
+		_, err = r.Git.CmdArgs(
+			"git", "-C", path, "checkout", "FETCH_HEAD",
+		)
 		if err != nil {
 			return err
 		}
 	} else {
-		cmdFetch := []string{"git", "-C", path, "pull", "--quiet"}
-		_, err := execGit(strings.Join(cmdFetch, " "))
+		_, err := r.Git.CmdArgs("git", "-C", path, "pull", "--quiet")
 		if err != nil {
 			return err
 		}
@@ -99,7 +101,7 @@ func (r *Repository) cloneRemote(path, url, ref string) error {
 	}
 	cmdClone = append(cmdClone, url)
 
-	_, err := execGit(strings.Join(cmdClone, " "))
+	_, err := r.Git.CmdArgs(cmdClone...)
 	if err != nil {
 		return err
 	}