diff --git a/bitshift/author_files.py b/bitshift/author_files.py
deleted file mode 100644
index ed9f2c8..0000000
--- a/bitshift/author_files.py
+++ /dev/null
@@ -1,53 +0,0 @@
-"""
-Output author/date information about the latest files in a Git repository.
-
-When executed inside a Git archive, prints a single line of metadata for every
-file in the work tree. A given line contains the file's filename, authors,
-and Unix timestamps for the file's time of creation and last modification; the
-separate entries are null-delimited.
-
-Sample output:
-	socket_io.c\x00John Doe Jane Doe\x001384488690\x001384534626
-	# filename: socket_io.c
-	# Author Names:
-"""
-
-import fileinput, subprocess
-
-git_log = subprocess.check_output("git --no-pager log --name-only \
-	--pretty=format:'%n%n%an%n%at' -z", shell=True)
-
-commits = []
-for commit in git_log.split("\n\n"):
-	fields = commit.split("\n")
-	if len(fields) > 2:
-		commits.append({
-			"author" : fields[0],
-			"timestamp" : int(fields[1]),
-			"filenames" : fields[2].split("\0")[:-2]
-		})
-
-
-tracked_files = subprocess.check_output("perl -le 'for (@ARGV){ print if -f && \
-	T }' $(find . -type d -name .git -prune -o -print)", shell=True)
-tracked_files = [filename[2:] for filename in tracked_files.split("\n")[:-1]]
-
-file_authors = {}
-for commit in commits:
-	for filename in commit["filenames"]:
-		if filename in tracked_files:
-			if filename not in file_authors.keys():
-				file_authors[filename] = {
-					"authors" : [commit["author"]],
-					"timestamps" : [commit["timestamp"]]
-				}
-			else:
-				if commit["author"] not in file_authors[filename]["authors"]:
-					file_authors[filename]["authors"].append(commit["author"])
-				file_authors[filename]["timestamps"].append(commit["timestamp"])
-
-for filename in file_authors.keys():
-	authors = "\0".join(file_authors[filename]["authors"])
-	time_created = min(file_authors[filename]["timestamps"])
-	time_last_modified = max(file_authors[filename]["timestamps"])
-	print "%s\0%s\0%d\0%d" % (filename, authors, time_created, time_last_modified)
diff --git a/bitshift/crawler/crawler.py b/bitshift/crawler/crawler.py
new file mode 100644
index 0000000..46cd54e
--- /dev/null
+++ b/bitshift/crawler/crawler.py
@@ -0,0 +1,37 @@
+"""
+
+"""
+
+import requests, time
+
+import git_indexer
+
+# from .codelet import Codelet
+# from .database import Database
+
+def github():
+    """
+    Query the GitHub API for data about every public repository.
+
+    Pull all of GitHub's repositories by making calls to its API in a loop,
+    accessing a subsequent page of results via the "next" URL returned in an
+    API response header. Uses Severyn Kozak's (sevko) authentication
+    credentials.
+    """
+
+    next_api_url = "https://api.github.com/repositories"
+    authentication_params = {
+        "client_id" : "436cb884ae09be7f2a4e",
+        "client_secret" : "8deeefbc2439409c5b7a092fd086772fe8b1f24e"
+    }
+
+    while len(next_api_url) > 0:
+        response = requests.get(next_api_url, params=authentication_params)
+
+        for repo in response.json():
+            codelets = git_indexer.index_repository(repo["html_url"])
+
+        if int(response.headers["x-ratelimit-remaining"]) == 0:
+            time.sleep(int(response.headers["x-ratelimit-reset"]) - time.time())
+
+        next_api_url = requests.headers["link"].split(">")[0][1:]
diff --git a/bitshift/crawler/git_indexer.py b/bitshift/crawler/git_indexer.py
new file mode 100644
index 0000000..a98c600
--- /dev/null
+++ b/bitshift/crawler/git_indexer.py
@@ -0,0 +1,134 @@
+"""
+:synopsis: Index all the files in a Git repository.
+
+Clone a Git repository, and retrieve the following information about each file:
+filename, contributor names, dates of creation and last modification, and the
+file text.
+"""
+
+import fileinput, subprocess, os
+
+def index_repository(repo_url):
+    """
+    Generate metadata for every file in a Git repository.
+
+    `git clone` the Git repository located at **repo_url**, and return metadata
+    about every one of non-binary (text) files in its if main branch (usually
+    *master*).
+
+    :return: An array of metadata dictionaries.
+        .. code-block:: python
+           sample_returned_array = [
+               {
+                   "filename" : (str) "myfile"
+                   "time_created" : (int) 1395939566,
+                   "time_last_modified" : (int) 1396920409,
+                   "source" : (str) "The source code of the file."
+               }
+           ]
+    """
+
+    repo_name = repo_url.split("/")[-1]
+    subprocess.call("git clone %s" % repo_url, shell=True)
+    os.chdir(repo_name)
+
+    files_meta = []
+    commits_meta = _get_commits_metadata()
+    for filename in commits_meta.keys():
+        commits_meta[filename]["filename"] = filename
+        with open(filename, "r") as source_file:
+            commits_meta[filename]["source"] = source_file.read()
+        files_meta.append(commits_meta[filename])
+
+    os.chdir("..")
+    subprocess.call("rm -rf %s" % repo_name, shell=True)
+    return files_meta
+
+def _get_git_commits():
+    """
+    Return the current working directory's formatted commit data.
+
+    Uses `git log` to generate metadata about every single file in the
+    repository's commit history.
+
+    :return: The author, timestamp, and names of all modified files of every
+        commit.
+        .. code-block:: python
+           sample_returned_array = [
+               {
+                   "author" : (str) "author"
+                   "timestamp" : (int) 1396919293,
+                   "filename" : (str array) ["file1", "file2"]
+               }
+           ]
+    :rtype: dictionary
+    """
+
+    git_log = subprocess.check_output("git --no-pager log --name-only \
+        --pretty=format:'%n%n%an%n%at' -z", shell=True)
+
+    commits = []
+    for commit in git_log.split("\n\n"):
+        fields = commit.split("\n")
+        if len(fields) > 2:
+            commits.append({
+                "author" : fields[0],
+                "timestamp" : int(fields[1]),
+                "filenames" : fields[2].split("\0")[:-2]
+            })
+
+    return commits
+
+def _get_tracked_files():
+    """
+    Return a list of the filenames of all files in the Git repository.
+
+    Get a list of the filenames of the non-binary (Perl heuristics used for
+    filetype identification) files currently inside the current working
+    directory's Git repository.
+
+    :return: The filenames of all non-binary files.
+    :rtype: str array
+    """
+
+    tracked_files = subprocess.check_output("perl -le 'for (@ARGV){ print if \
+        -f && -T }' $(find . -type d -name .git -prune -o -print)", shell=True)
+    return [filename[2:] for filename in tracked_files.split("\n")[:-1]]
+
+def _get_commits_metadata():
+    """
+    Return a dictionary containing every tracked file's metadata.
+
+    :return: A dictionary with author names, time of creation, and time of last
+        modification for every filename key.
+        .. code-block:: python
+               sample_returned_dict = {
+                   "my_file" : {
+                       "authors" : (str array) ["author1", "author2"],
+                       "time_created" : (int) 1395939566,
+                       "time_last_modified" : (int) 1396920409
+                   }
+               }
+    :rtype: dictionary
+    """
+
+    commits = _get_git_commits()
+    tracked_files  = _get_tracked_files()
+
+    files_meta = {}
+    for commit in commits:
+        for filename in commit["filenames"]:
+            if filename not in tracked_files:
+                continue
+
+            if filename not in files_meta.keys():
+                files_meta[filename] = {
+                    "authors" : [commit["author"]],
+                    "time_last_modified" : commit["timestamp"]
+                }
+            else:
+                if commit["author"] not in files_meta[filename]["authors"]:
+                    files_meta[filename]["authors"].append(commit["author"])
+                files_meta[filename]["time_created"] = commit["timestamp"]
+
+    return files_meta