improve git package documentation (fix #231)

Author: ajnavarro

blame.go

@@ -13,17 +13,21 @@ import (
 	"srcd.works/go-git.v4/utils/diff"
 )
 
+// BlameResult represents the result of a Blame operation
 type BlameResult struct {
-	Path  string
-	Rev   plumbing.Hash
+	// Path is the path of the File that we're blaming
+	Path string
+	// Rev is the hash of the specified Commit used to generate this result
+	Rev plumbing.Hash
+	// Lines contains every line with its authorship
 	Lines []*Line
 }
 
-// Blame returns the last commit that modified each line of a file in a
-// repository.
-//
-// The file to blame is identified by the input arguments: repo, commit and path.
-// The output is a slice of commits, one for each line in the file.
+// Blame returns a BlameResult that contains all the data needed to know the
+// last author of each line of an specified file starting the history from
+// a specified commit. The file to blame is identified by the input arguments:
+// commit and path. commit is a Commit object obtained from a Repository. Path
+// represents a path to a specific file contained into the repository.
 //
 // Blaming a file is a two step process:
 //
@@ -33,12 +37,6 @@ type BlameResult struct {
 // 2. Then build a graph with a node for every line in every file in
 // the history of the file.
 //
-// Each node (line) holds the commit where it was introduced or
-// last modified. To achieve that we use the FORWARD algorithm
-// described in Zimmermann, et al. "Mining Version Archives for
-// Co-changed Lines", in proceedings of the Mining Software
-// Repositories workshop, Shanghai, May 22-23, 2006.
-//
 // Each node is assigned a commit: Start by the nodes in the first
 // commit. Assign that commit as the creator of all its lines.
 //
@@ -98,8 +96,10 @@ func Blame(c *object.Commit, path string) (*BlameResult, error) {
 
 // Line values represent the contents and author of a line in BlamedResult values.
 type Line struct {
-	Author string // email address of the author of the line.
-	Text   string // original text of the line.
+	// Author is the email address of the last author that modified the line
+	Author string
+	// Text is the original text of the line.
+	Text string
 }
 
 func newLine(author, text string) *Line {

references.go

@@ -10,15 +10,18 @@ import (
 	"github.com/sergi/go-diff/diffmatchpatch"
 )
 
-// References returns a References for the file at "path", the commits are
-// sorted in commit order. It stops searching a branch for a file upon reaching
-// the commit were the file was created.
+// References returns a slice of Commits for the file at "path", starting from
+// the commit provided that contains the file from the provided path. The last
+// commit into the returned slice is the commit where the file was created.
+// If the provided commit does not contains the specified path, a nil slice is
+// returned. The commits are sorted in commit order, newer to older.
 //
 // Caveats:
+//
 // - Moves and copies are not currently supported.
+//
 // - Cherry-picks are not detected unless there are no commits between them and
-//   therefore can appear repeated in the list.
-//   (see git path-id for hints on how to fix this).
+// therefore can appear repeated in the list. (see git path-id for hints on how to fix this).
 func References(c *object.Commit, path string) ([]*object.Commit, error) {
 	var result []*object.Commit
 	seen := make(map[plumbing.Hash]struct{}, 0)

remote.go

@@ -32,7 +32,7 @@ func newRemote(s storage.Storer, c *config.RemoteConfig) *Remote {
 	return &Remote{s: s, c: c}
 }
 
-// Config return the config
+// Config returns the RemoteConfig object used to instantiate this Remote
 func (r *Remote) Config() *config.RemoteConfig {
 	return r.c
 }