Worktree: Provide ability to add excludes (#825)

Worktree: Provide ability to add excludes

2 files changed, 249 insertions, 7 deletions

diff --git a/plumbing/format/gitignore/dir.go b/plumbing/format/gitignore/dir.go
index 41dd624..1e88970 100644
--- a/plumbing/format/gitignore/dir.go
+++ b/plumbing/format/gitignore/dir.go
@@ -1,24 +1,31 @@
 package gitignore
 
 import (
+	"bytes"
 	"io/ioutil"
 	"os"
+	"os/user"
 	"strings"
 
 	"gopkg.in/src-d/go-billy.v4"
+	"gopkg.in/src-d/go-git.v4/plumbing/format/config"
+	gioutil "gopkg.in/src-d/go-git.v4/utils/ioutil"
 )
 
 const (
 	commentPrefix = "#"
+	coreSection   = "core"
 	eol           = "\n"
+	excludesfile  = "excludesfile"
 	gitDir        = ".git"
 	gitignoreFile = ".gitignore"
+	gitconfigFile = ".gitconfig"
+	systemFile    = "/etc/gitconfig"
 )
 
-// ReadPatterns reads gitignore patterns recursively traversing through the directory
-// structure. The result is in the ascending order of priority (last higher).
-func ReadPatterns(fs billy.Filesystem, path []string) (ps []Pattern, err error) {
-	f, err := fs.Open(fs.Join(append(path, gitignoreFile)...))
+// readIgnoreFile reads a specific git ignore file.
+func readIgnoreFile(fs billy.Filesystem, path []string, ignoreFile string) (ps []Pattern, err error) {
+	f, err := fs.Open(fs.Join(append(path, ignoreFile)...))
 	if err == nil {
 		defer f.Close()
 
@@ -33,6 +40,14 @@ func ReadPatterns(fs billy.Filesystem, path []string) (ps []Pattern, err error)
 		return nil, err
 	}
 
+	return
+}
+
+// ReadPatterns reads gitignore patterns recursively traversing through the directory
+// structure. The result is in the ascending order of priority (last higher).
+func ReadPatterns(fs billy.Filesystem, path []string) (ps []Pattern, err error) {
+	ps, _ = readIgnoreFile(fs, path, gitignoreFile)
+
 	var fis []os.FileInfo
 	fis, err = fs.ReadDir(fs.Join(path...))
 	if err != nil {
@@ -55,3 +70,67 @@ func ReadPatterns(fs billy.Filesystem, path []string) (ps []Pattern, err error)
 
 	return
 }
+
+func loadPatterns(fs billy.Filesystem, path string) (ps []Pattern, err error) {
+	f, err := fs.Open(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	defer gioutil.CheckClose(f, &err)
+
+	b, err := ioutil.ReadAll(f)
+	if err != nil {
+		return
+	}
+
+	d := config.NewDecoder(bytes.NewBuffer(b))
+
+	raw := config.New()
+	if err = d.Decode(raw); err != nil {
+		return
+	}
+
+	s := raw.Section(coreSection)
+	efo := s.Options.Get(excludesfile)
+	if efo == "" {
+		return nil, nil
+	}
+
+	ps, err = readIgnoreFile(fs, nil, efo)
+	if os.IsNotExist(err) {
+		return nil, nil
+	}
+
+	return
+}
+
+// LoadGlobalPatterns loads gitignore patterns from from the gitignore file
+// declared in a user's ~/.gitconfig file.  If the ~/.gitconfig file does not
+// exist the function will return nil.  If the core.excludesfile property
+// is not declared, the function will return nil.  If the file pointed to by
+// the core.excludesfile property does not exist, the function will return nil.
+//
+// The function assumes fs is rooted at the root filesystem.
+func LoadGlobalPatterns(fs billy.Filesystem) (ps []Pattern, err error) {
+	usr, err := user.Current()
+	if err != nil {
+		return
+	}
+
+	return loadPatterns(fs, fs.Join(usr.HomeDir, gitconfigFile))
+}
+
+// LoadSystemPatterns loads gitignore patterns from from the gitignore file
+// declared in a system's /etc/gitconfig file.  If the ~/.gitconfig file does
+// not exist the function will return nil.  If the core.excludesfile property
+// is not declared, the function will return nil.  If the file pointed to by
+// the core.excludesfile property does not exist, the function will return nil.
+//
+// The function assumes fs is rooted at the root filesystem.
+func LoadSystemPatterns(fs billy.Filesystem) (ps []Pattern, err error) {
+	return loadPatterns(fs, systemFile)
+}
diff --git a/plumbing/format/gitignore/dir_test.go b/plumbing/format/gitignore/dir_test.go
index b8a5453..13e2d82 100644
--- a/plumbing/format/gitignore/dir_test.go
+++ b/plumbing/format/gitignore/dir_test.go
@@ -2,6 +2,8 @@ package gitignore
 
 import (
 	"os"
+	"os/user"
+	"strconv"
 
 	. "gopkg.in/check.v1"
 	"gopkg.in/src-d/go-billy.v4"
@@ -9,12 +11,19 @@ import (
 )
 
 type MatcherSuite struct {
-	FS billy.Filesystem
+	GFS  billy.Filesystem // git repository root
+	RFS  billy.Filesystem // root that contains user home
+	MCFS billy.Filesystem // root that contains user home, but missing ~/.gitconfig
+	MEFS billy.Filesystem // root that contains user home, but missing excludesfile entry
+	MIFS billy.Filesystem // root that contains user home, but missing .gitnignore
+
+	SFS  billy.Filesystem // root that contains /etc/gitconfig
 }
 
 var _ = Suite(&MatcherSuite{})
 
 func (s *MatcherSuite) SetUpTest(c *C) {
+	// setup generic git repository root
 	fs := memfs.New()
 	f, err := fs.Create(".gitignore")
 	c.Assert(err, IsNil)
@@ -36,11 +45,127 @@ func (s *MatcherSuite) SetUpTest(c *C) {
 	fs.MkdirAll("vendor/github.com", os.ModePerm)
 	fs.MkdirAll("vendor/gopkg.in", os.ModePerm)
 
-	s.FS = fs
+	s.GFS = fs
+
+	// setup root that contains user home
+	usr, err := user.Current()
+	c.Assert(err, IsNil)
+
+	fs = memfs.New()
+	err = fs.MkdirAll(usr.HomeDir, os.ModePerm)
+	c.Assert(err, IsNil)
+
+	f, err = fs.Create(fs.Join(usr.HomeDir, gitconfigFile))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("[core]\n"))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("	excludesfile = " + strconv.Quote(fs.Join(usr.HomeDir, ".gitignore_global")) + "\n"))
+	c.Assert(err, IsNil)
+	err = f.Close()
+	c.Assert(err, IsNil)
+
+	f, err = fs.Create(fs.Join(usr.HomeDir, ".gitignore_global"))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("# IntelliJ\n"))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte(".idea/\n"))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("*.iml\n"))
+	c.Assert(err, IsNil)
+	err = f.Close()
+	c.Assert(err, IsNil)
+
+	s.RFS = fs
+
+	// root that contains user home, but missing ~/.gitconfig
+	fs = memfs.New()
+	err = fs.MkdirAll(usr.HomeDir, os.ModePerm)
+	c.Assert(err, IsNil)
+
+	f, err = fs.Create(fs.Join(usr.HomeDir, ".gitignore_global"))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("# IntelliJ\n"))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte(".idea/\n"))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("*.iml\n"))
+	c.Assert(err, IsNil)
+	err = f.Close()
+	c.Assert(err, IsNil)
+
+	s.MCFS = fs
+
+	// setup root that contains user home, but missing excludesfile entry
+	fs = memfs.New()
+	err = fs.MkdirAll(usr.HomeDir, os.ModePerm)
+	c.Assert(err, IsNil)
+
+	f, err = fs.Create(fs.Join(usr.HomeDir, gitconfigFile))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("[core]\n"))
+	c.Assert(err, IsNil)
+	err = f.Close()
+	c.Assert(err, IsNil)
+
+	f, err = fs.Create(fs.Join(usr.HomeDir, ".gitignore_global"))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("# IntelliJ\n"))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte(".idea/\n"))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("*.iml\n"))
+	c.Assert(err, IsNil)
+	err = f.Close()
+	c.Assert(err, IsNil)
+
+	s.MEFS = fs
+
+	// setup root that contains user home, but missing .gitnignore
+	fs = memfs.New()
+	err = fs.MkdirAll(usr.HomeDir, os.ModePerm)
+	c.Assert(err, IsNil)
+
+	f, err = fs.Create(fs.Join(usr.HomeDir, gitconfigFile))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("[core]\n"))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("	excludesfile = " + strconv.Quote(fs.Join(usr.HomeDir, ".gitignore_global")) + "\n"))
+	c.Assert(err, IsNil)
+	err = f.Close()
+	c.Assert(err, IsNil)
+
+	s.MIFS = fs
+
+	// setup root that contains user home
+	fs = memfs.New()
+	err = fs.MkdirAll("etc", os.ModePerm)
+	c.Assert(err, IsNil)
+
+	f, err = fs.Create(systemFile)
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("[core]\n"))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("	excludesfile = /etc/gitignore_global\n"))
+	c.Assert(err, IsNil)
+	err = f.Close()
+	c.Assert(err, IsNil)
+
+	f, err = fs.Create("/etc/gitignore_global")
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("# IntelliJ\n"))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte(".idea/\n"))
+	c.Assert(err, IsNil)
+	_, err = f.Write([]byte("*.iml\n"))
+	c.Assert(err, IsNil)
+	err = f.Close()
+	c.Assert(err, IsNil)
+
+	s.SFS = fs
 }
 
 func (s *MatcherSuite) TestDir_ReadPatterns(c *C) {
-	ps, err := ReadPatterns(s.FS, nil)
+	ps, err := ReadPatterns(s.GFS, nil)
 	c.Assert(err, IsNil)
 	c.Assert(ps, HasLen, 2)
 
@@ -48,3 +173,41 @@ func (s *MatcherSuite) TestDir_ReadPatterns(c *C) {
 	c.Assert(m.Match([]string{"vendor", "gopkg.in"}, true), Equals, true)
 	c.Assert(m.Match([]string{"vendor", "github.com"}, true), Equals, false)
 }
+
+func (s *MatcherSuite) TestDir_LoadGlobalPatterns(c *C) {
+	ps, err := LoadGlobalPatterns(s.RFS)
+	c.Assert(err, IsNil)
+	c.Assert(ps, HasLen, 2)
+
+	m := NewMatcher(ps)
+	c.Assert(m.Match([]string{"go-git.v4.iml"}, true), Equals, true)
+	c.Assert(m.Match([]string{".idea"}, true), Equals, true)
+}
+
+func (s *MatcherSuite) TestDir_LoadGlobalPatternsMissingGitconfig(c *C) {
+	ps, err := LoadGlobalPatterns(s.MCFS)
+	c.Assert(err, IsNil)
+	c.Assert(ps, HasLen, 0)
+}
+
+func (s *MatcherSuite) TestDir_LoadGlobalPatternsMissingExcludesfile(c *C) {
+	ps, err := LoadGlobalPatterns(s.MEFS)
+	c.Assert(err, IsNil)
+	c.Assert(ps, HasLen, 0)
+}
+
+func (s *MatcherSuite) TestDir_LoadGlobalPatternsMissingGitignore(c *C) {
+	ps, err := LoadGlobalPatterns(s.MIFS)
+	c.Assert(err, IsNil)
+	c.Assert(ps, HasLen, 0)
+}
+
+func (s *MatcherSuite) TestDir_LoadSystemPatterns(c *C) {
+	ps, err := LoadSystemPatterns(s.SFS)
+	c.Assert(err, IsNil)
+	c.Assert(ps, HasLen, 2)
+
+	m := NewMatcher(ps)
+	c.Assert(m.Match([]string{"go-git.v4.iml"}, true), Equals, true)
+	c.Assert(m.Match([]string{".idea"}, true), Equals, true)
+}