thodg/libgit2

diff --git a/include/git2.h b/include/git2.h
index d843539..baa7fca 100644
--- a/include/git2.h
+++ b/include/git2.h
@@ -19,6 +19,7 @@
 #include "git2/commit.h"
 #include "git2/common.h"
 #include "git2/config.h"
+#include "git2/describe.h"
 #include "git2/diff.h"
 #include "git2/errors.h"
 #include "git2/filter.h"
diff --git a/include/git2/common.h b/include/git2/common.h
index 32237ef..ceb2720 100644
--- a/include/git2/common.h
+++ b/include/git2/common.h
@@ -83,6 +83,8 @@ GIT_BEGIN_DECL
  */
 #define GIT_OID_HEX_ZERO "0000000000000000000000000000000000000000"
 
+#define FLAG_BITS 27
+
 /**
  * Return the version of the libgit2 library
  * being currently used.
diff --git a/include/git2/describe.h b/include/git2/describe.h
new file mode 100644
index 0000000..66b88c4
--- /dev/null
+++ b/include/git2/describe.h
@@ -0,0 +1,162 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#ifndef INCLUDE_git_describe_h__
+#define INCLUDE_git_describe_h__
+
+#include "common.h"
+#include "types.h"
+#include "buffer.h"
+
+/**
+ * @file git2/describe.h
+ * @brief Git describing routines
+ * @defgroup git_describe Git describing routines
+ * @ingroup Git
+ * @{
+ */
+GIT_BEGIN_DECL
+
+/**
+ * Reference lookup strategy
+ *
+ * These behave like the --tags and --all optios to git-describe,
+ * namely they say to look for any reference in either refs/tags/ or
+ * refs/ respectively.
+ */
+typedef enum {
+	GIT_DESCRIBE_DEFAULT,
+	GIT_DESCRIBE_TAGS,
+	GIT_DESCRIBE_ALL,
+} git_describe_strategy_t;
+
+/**
+ * Describe options structure
+ *
+ * Initialize with `GIT_DESCRIBE_OPTIONS_INIT` macro to correctly set
+ * the `version` field.  E.g.
+ *
+ *		git_describe_options opts = GIT_DESCRIBE_OPTIONS_INIT;
+ */
+typedef struct git_describe_options {
+	unsigned int version;
+
+	unsigned int max_candidates_tags; /** default: 10 */
+	unsigned int describe_strategy; /** default: GIT_DESCRIBE_DEFAULT */
+	const char *pattern;
+	/**
+	 * When calculating the distance from the matching tag or
+	 * reference, only walk down the first-parent ancestry.
+	 */
+	int only_follow_first_parent;
+	/**
+	 * If no matching tag or reference is found, the describe
+	 * operation would normally fail. If this option is set, it
+	 * will instead fall back to showing the full id of the
+	 * commit.
+	 */
+	int show_commit_oid_as_fallback;
+} git_describe_options;
+
+#define GIT_DESCRIBE_DEFAULT_MAX_CANDIDATES_TAGS 10
+#define GIT_DESCRIBE_DEFAULT_ABBREVIATED_SIZE 7
+
+#define GIT_DESCRIBE_OPTIONS_VERSION 1
+#define GIT_DESCRIBE_OPTIONS_INIT { \
+	GIT_DESCRIBE_OPTIONS_VERSION, \
+	GIT_DESCRIBE_DEFAULT_MAX_CANDIDATES_TAGS, \
+}
+
+GIT_EXTERN(int) git_describe_init_options(git_describe_options *opts, unsigned int version);
+
+/**
+ * Options for formatting the describe string
+ */
+typedef struct {
+	unsigned int version;
+
+	/**
+	 * Size of the abbreviated commit id to use. This value is the
+	 * lower bound for the length of the abbreviated string. The
+	 * default is 7.
+	 */
+	unsigned int abbreviated_size;
+
+	/**
+	 * Set to use the long format even when a shorter name could be used.
+	 */
+	int always_use_long_format;
+
+	/**
+	 * If the workdir is dirty and this is set, this string will
+	 * be appended to the description string.
+	 */
+	char *dirty_suffix;
+} git_describe_format_options;
+
+#define GIT_DESCRIBE_FORMAT_OPTIONS_VERSION 1
+#define GIT_DESCRIBE_FORMAT_OPTIONS_INIT { \
+		GIT_DESCRIBE_FORMAT_OPTIONS_VERSION,   \
+		GIT_DESCRIBE_DEFAULT_ABBREVIATED_SIZE, \
+ }
+
+GIT_EXTERN(int) git_describe_init_format_options(git_describe_format_options *opts, unsigned int version);
+
+typedef struct git_describe_result git_describe_result;
+
+/**
+ * Describe a commit
+ *
+ * Perform the describe operation on the given committish object.
+ *
+ * @param result pointer to store the result. You must free this once
+ * you're done with it.
+ * @param committish a committish to describe
+ * @param opts the lookup options
+ */
+GIT_EXTERN(int) git_describe_commit(
+	git_describe_result **result,
+	git_object *committish,
+	git_describe_options *opts);
+
+/**
+ * Describe a commit
+ *
+ * Perform the describe operation on the current commit and the
+ * worktree. After peforming describe on HEAD, a status is run and the
+ * description is considered to be dirty if there are.
+ *
+ * @param result pointer to store the result. You must free this once
+ * you're done with it.
+ * @param repo the repository in which to perform the describe
+ * @param opts the lookup options
+ */
+GIT_EXTERN(int) git_describe_workdir(
+	git_describe_result **out,
+	git_repository *repo,
+	git_describe_options *opts);
+
+/**
+ * Print the describe result to a buffer
+ *
+ * @param result the result from `git_describe_commit()` or
+ * `git_describe_workdir()`.
+ * @param opt the formatting options
+ */
+GIT_EXTERN(int) git_describe_format(
+	git_buf *out,
+	const git_describe_result *result,
+	const git_describe_format_options *opts);
+
+/**
+ * Free the describe result.
+ */
+GIT_EXTERN(void) git_describe_result_free(git_describe_result *result);
+
+/** @} */
+GIT_END_DECL
+
+#endif
diff --git a/include/git2/errors.h b/include/git2/errors.h
index 2ba9924..1e3ed3a 100644
--- a/include/git2/errors.h
+++ b/include/git2/errors.h
@@ -89,6 +89,7 @@ typedef enum {
 	GITERR_REVERT,
 	GITERR_CALLBACK,
 	GITERR_CHERRYPICK,
+	GITERR_DESCRIBE,
 } git_error_t;
 
 /**
diff --git a/src/commit_list.h b/src/commit_list.h
index 490d841..7cd3945 100644
--- a/src/commit_list.h
+++ b/src/commit_list.h
@@ -25,7 +25,7 @@ typedef struct git_commit_list_node {
 			 uninteresting:1,
 			 topo_delay:1,
 			 parsed:1,
-			 flags : 4;
+			 flags : FLAG_BITS;
 
 	unsigned short in_degree;
 	unsigned short out_degree;
diff --git a/src/describe.c b/src/describe.c
new file mode 100644
index 0000000..08c99a7
--- /dev/null
+++ b/src/describe.c
@@ -0,0 +1,871 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#include "git2/describe.h"
+#include "git2/strarray.h"
+#include "git2/diff.h"
+#include "git2/status.h"
+
+#include "common.h"
+#include "commit.h"
+#include "commit_list.h"
+#include "oidmap.h"
+#include "refs.h"
+#include "revwalk.h"
+#include "tag.h"
+#include "vector.h"
+#include "repository.h"
+
+/* Ported from https://github.com/git/git/blob/89dde7882f71f846ccd0359756d27bebc31108de/builtin/describe.c */
+
+struct commit_name {
+	git_tag *tag;
+	unsigned prio:2; /* annotated tag = 2, tag = 1, head = 0 */
+	unsigned name_checked:1;
+	git_oid sha1;
+	char *path;
+
+	/* Khash workaround. They original key has to still be reachable */
+	git_oid peeled; 
+};
+
+static void *oidmap_value_bykey(git_oidmap *map, const git_oid *key)
+{
+	khint_t pos = git_oidmap_lookup_index(map, key);
+
+	if (!git_oidmap_valid_index(map, pos))
+		return NULL;
+
+	return git_oidmap_value_at(map, pos);
+}
+
+static struct commit_name *find_commit_name(
+	git_oidmap *names,
+	const git_oid *peeled)
+{
+	return (struct commit_name *)(oidmap_value_bykey(names, peeled));
+}
+
+static int replace_name(
+	git_tag **tag,
+	git_repository *repo,
+	struct commit_name *e,
+	unsigned int prio,
+	const git_oid *sha1)
+{
+	git_time_t e_time = 0, t_time = 0;
+
+	if (!e || e->prio < prio)
+		return 1;
+
+	if (e->prio == 2 && prio == 2) {
+		/* Multiple annotated tags point to the same commit.
+		 * Select one to keep based upon their tagger date.
+		 */
+		git_tag *t = NULL;
+
+		if (!e->tag) {
+			if (git_tag_lookup(&t, repo, &e->sha1) < 0)
+				return 1;
+			e->tag = t;
+		}
+
+		if (git_tag_lookup(&t, repo, sha1) < 0)
+			return 0;
+
+		*tag = t;
+
+		if (e->tag->tagger)
+			e_time = e->tag->tagger->when.time;
+
+		if (t->tagger)
+			t_time = t->tagger->when.time;
+
+		if (e_time < t_time)
+			return 1;
+	}
+
+	return 0;
+}
+
+static int add_to_known_names(
+	git_repository *repo,
+	git_oidmap *names,
+	const char *path,
+	const git_oid *peeled,
+	unsigned int prio,
+	const git_oid *sha1)
+{
+	struct commit_name *e = find_commit_name(names, peeled);
+	bool found = (e != NULL);
+
+	git_tag *tag = NULL;
+	if (replace_name(&tag, repo, e, prio, sha1)) {
+		if (!found) {
+			e = git__malloc(sizeof(struct commit_name));
+			GITERR_CHECK_ALLOC(e);
+
+			e->path = NULL;
+			e->tag = NULL;
+		}
+
+		if (e->tag)
+			git_tag_free(e->tag);
+		e->tag = tag;
+		e->prio = prio;
+		e->name_checked = 0;
+		git_oid_cpy(&e->sha1, sha1);
+		git__free(e->path);
+		e->path = git__strdup(path);
+		git_oid_cpy(&e->peeled, peeled);
+
+		if (!found) {
+			int ret;
+
+			git_oidmap_insert(names, &e->peeled, e, ret);
+			if (ret < 0)
+				return -1;
+		}
+	}
+	else
+		git_tag_free(tag);
+
+	return 0;
+}
+
+static int retrieve_peeled_tag_or_object_oid(
+	git_oid *peeled_out,
+	git_oid *ref_target_out,
+	git_repository *repo,
+	const char *refname)
+{
+	git_reference *ref;
+	git_object *peeled = NULL;
+	int error;
+
+	if ((error = git_reference_lookup_resolved(&ref, repo, refname, -1)) < 0)
+		return error;
+
+	if ((error = git_reference_peel(&peeled, ref, GIT_OBJ_ANY)) < 0)
+		goto cleanup;
+
+	git_oid_cpy(ref_target_out, git_reference_target(ref));
+	git_oid_cpy(peeled_out, git_object_id(peeled));
+
+	if (git_oid_cmp(ref_target_out, peeled_out) != 0)
+		error = 1; /* The reference was pointing to a annotated tag */
+	else
+		error = 0; /* Any other object */
+
+cleanup:
+	git_reference_free(ref);
+	git_object_free(peeled);
+	return error;
+}
+
+struct git_describe_result {
+	int dirty;
+	int exact_match;
+	int fallback_to_id;
+	git_oid commit_id;
+	git_repository *repo;
+	struct commit_name *name;
+	struct possible_tag *tag;
+};
+
+struct get_name_data
+{
+	git_describe_options *opts;
+	git_repository *repo;
+	git_oidmap *names;
+	git_describe_result *result;
+};
+
+static int commit_name_dup(struct commit_name **out, struct commit_name *in)
+{
+	struct commit_name *name;
+
+	name = git__malloc(sizeof(struct commit_name));
+	GITERR_CHECK_ALLOC(name);
+
+	memcpy(name, in,  sizeof(struct commit_name));
+	name->tag = NULL;
+	name->path = NULL;
+
+	if (in->tag && git_object_dup((git_object **) &name->tag, (git_object *) in->tag) < 0)
+		return -1;
+
+	name->path = git__strdup(in->path);
+	GITERR_CHECK_ALLOC(name->path);
+
+	*out = name;
+	return 0;
+}
+
+static int get_name(const char *refname, void *payload)
+{
+	struct get_name_data *data;
+	bool is_tag, is_annotated, all;
+	git_oid peeled, sha1;
+	unsigned int prio;
+	int error = 0;
+
+	data = (struct get_name_data *)payload;
+	is_tag = !git__prefixcmp(refname, GIT_REFS_TAGS_DIR);
+	all = data->opts->describe_strategy == GIT_DESCRIBE_ALL;
+
+	/* Reject anything outside refs/tags/ unless --all */
+	if (!all && !is_tag)
+		return 0;
+
+	/* Accept only tags that match the pattern, if given */
+	if (data->opts->pattern && (!is_tag || p_fnmatch(data->opts->pattern,
+		refname + strlen(GIT_REFS_TAGS_DIR), 0)))
+				return 0;
+
+	/* Is it annotated? */
+	if ((error = retrieve_peeled_tag_or_object_oid(
+		&peeled, &sha1, data->repo, refname)) < 0)
+		return error;
+
+	is_annotated = error;
+
+	/*
+	 * By default, we only use annotated tags, but with --tags
+	 * we fall back to lightweight ones (even without --tags,
+	 * we still remember lightweight ones, only to give hints
+	 * in an error message).  --all allows any refs to be used.
+	 */
+	if (is_annotated)
+		prio = 2;
+	else if (is_tag)
+		prio = 1;
+	else
+		prio = 0;
+
+	add_to_known_names(data->repo, data->names,
+		all ? refname + strlen(GIT_REFS_DIR) : refname + strlen(GIT_REFS_TAGS_DIR),
+		&peeled, prio, &sha1);
+	return 0;
+}
+
+struct possible_tag {
+	struct commit_name *name;
+	int depth;
+	int found_order;
+	unsigned flag_within;
+};
+
+static int possible_tag_dup(struct possible_tag **out, struct possible_tag *in)
+{
+	struct possible_tag *tag;
+
+	tag = git__malloc(sizeof(struct possible_tag));
+	GITERR_CHECK_ALLOC(tag);
+
+	memcpy(tag, in, sizeof(struct possible_tag));
+	tag->name = NULL;
+
+	if (commit_name_dup(&tag->name, in->name) < 0)
+		return -1;
+
+	*out = tag;
+	return 0;
+}
+
+static int compare_pt(const void *a_, const void *b_)
+{
+	struct possible_tag *a = (struct possible_tag *)a_;
+	struct possible_tag *b = (struct possible_tag *)b_;
+	if (a->depth != b->depth)
+		return a->depth - b->depth;
+	if (a->found_order != b->found_order)
+		return a->found_order - b->found_order;
+	return 0;
+}
+
+#define SEEN (1u << 0)
+
+static unsigned long finish_depth_computation(
+	git_pqueue *list,
+	git_revwalk *walk,
+	struct possible_tag *best)
+{
+	unsigned long seen_commits = 0;
+	int error, i;
+
+	while (git_pqueue_size(list) > 0) {
+		git_commit_list_node *c = git_pqueue_pop(list);
+		seen_commits++;
+		if (c->flags & best->flag_within) {
+			size_t index = 0;
+			while (git_pqueue_size(list) > index) {
+				git_commit_list_node *i = git_pqueue_get(list, index);
+				if (!(i->flags & best->flag_within))
+					break;
+				index++;
+			}
+			if (index > git_pqueue_size(list))
+				break;
+		} else
+			best->depth++;
+		for (i = 0; i < c->out_degree; i++) {
+			git_commit_list_node *p = c->parents[i];
+			if ((error = git_commit_list_parse(walk, p)) < 0)
+				return error;
+			if (!(p->flags & SEEN))
+				if ((error = git_pqueue_insert(list, p)) < 0)
+					return error;
+			p->flags |= c->flags;
+		}
+	}
+	return seen_commits;
+}
+
+static int display_name(git_buf *buf, git_repository *repo, struct commit_name *n)
+{
+	if (n->prio == 2 && !n->tag) {
+		if (git_tag_lookup(&n->tag, repo, &n->sha1) < 0) {
+			giterr_set(GITERR_TAG, "Annotated tag '%s' not available", n->path);
+			return -1;
+		}
+	}
+
+	if (n->tag && !n->name_checked) {
+		if (!git_tag_name(n->tag)) {
+			giterr_set(GITERR_TAG, "Annotated tag '%s' has no embedded name", n->path);
+			return -1;
+		}
+
+		/* TODO: Cope with warnings
+		if (strcmp(n->tag->tag, all ? n->path + 5 : n->path))
+			warning(_("tag '%s' is really '%s' here"), n->tag->tag, n->path);
+		*/
+
+		n->name_checked = 1;
+	}
+
+	if (n->tag)
+		git_buf_printf(buf, "%s", git_tag_name(n->tag));
+	else
+		git_buf_printf(buf, "%s", n->path);
+
+	return 0;
+}
+
+static int find_unique_abbrev_size(
+	int *out,
+	git_repository *repo,
+	const git_oid *oid_in,
+	int abbreviated_size)
+{
+	size_t size = abbreviated_size;
+	git_odb *odb;
+	git_oid dummy;
+	int error;
+
+	if ((error = git_repository_odb__weakptr(&odb, repo)) < 0)
+		return error;
+
+	while (size < GIT_OID_HEXSZ) {
+		if ((error = git_odb_exists_prefix(&dummy, odb, oid_in, size)) == 0) {
+			*out = (int) size;
+			return 0;
+		}
+
+		/* If the error wasn't that it's not unique, then it's a proper error */
+		if (error != GIT_EAMBIGUOUS)
+			return error;
+
+		/* Try again with a larger size */
+		size++;
+	}
+
+	/* If we didn't find any shorter prefix, we have to do the whole thing */
+	*out = GIT_OID_HEXSZ;
+	
+	return 0;
+}
+
+static int show_suffix(
+	git_buf *buf,
+	int depth,
+	git_repository *repo,
+	const git_oid* id,
+	size_t abbrev_size)
+{
+	int error, size;
+
+	char hex_oid[GIT_OID_HEXSZ];
+
+	if ((error = find_unique_abbrev_size(&size, repo, id, abbrev_size)) < 0)
+		return error;
+
+	git_oid_fmt(hex_oid, id);
+
+	git_buf_printf(buf, "-%d-g", depth);
+
+	git_buf_put(buf, hex_oid, size);
+
+	return git_buf_oom(buf) ? -1 : 0;
+}
+
+#define MAX_CANDIDATES_TAGS FLAG_BITS - 1
+
+static int describe_not_found(const git_oid *oid, const char *message_format) {
+	char oid_str[GIT_OID_HEXSZ + 1];
+	git_oid_tostr(oid_str, sizeof(oid_str), oid);
+
+	giterr_set(GITERR_DESCRIBE, message_format, oid_str);
+	return GIT_ENOTFOUND;
+}
+
+static int describe(
+	struct get_name_data *data,
+	git_commit *commit)
+{
+	struct commit_name *n;
+	struct possible_tag *best;
+	bool all, tags;
+	git_revwalk *walk = NULL;
+	git_pqueue list;
+	git_commit_list_node *cmit, *gave_up_on = NULL;
+	git_vector all_matches = GIT_VECTOR_INIT;
+	unsigned int match_cnt = 0, annotated_cnt = 0, cur_match;
+	unsigned long seen_commits = 0;	/* TODO: Check long */
+	unsigned int unannotated_cnt = 0;
+	int error;
+
+	if (git_vector_init(&all_matches, MAX_CANDIDATES_TAGS, compare_pt) < 0)
+		return -1;
+
+	if ((error = git_pqueue_init(&list, 0, 2, git_commit_list_time_cmp)) < 0)
+		goto cleanup;
+
+	all = data->opts->describe_strategy == GIT_DESCRIBE_ALL;
+	tags = data->opts->describe_strategy == GIT_DESCRIBE_TAGS;
+
+	git_oid_cpy(&data->result->commit_id, git_commit_id(commit));
+
+	n = find_commit_name(data->names, git_commit_id(commit));
+	if (n && (tags || all || n->prio == 2)) {
+		/*
+		 * Exact match to an existing ref.
+		 */
+		data->result->exact_match = 1;
+		if ((error = commit_name_dup(&data->result->name, n)) < 0)
+			goto cleanup;
+
+		goto cleanup;
+	}
+
+	if (!data->opts->max_candidates_tags) {
+		error = describe_not_found(
+			git_commit_id(commit),
+			"Cannot describe - no tag exactly matches '%s'");
+
+		goto cleanup;
+	}
+
+	if ((error = git_revwalk_new(&walk, git_commit_owner(commit))) < 0)
+		goto cleanup;
+
+	if ((cmit = git_revwalk__commit_lookup(walk, git_commit_id(commit))) == NULL)
+		goto cleanup;
+
+	if ((error = git_commit_list_parse(walk, cmit)) < 0)
+		goto cleanup;
+
+	cmit->flags = SEEN;
+
+	if ((error = git_pqueue_insert(&list, cmit)) < 0)
+		goto cleanup;
+
+	while (git_pqueue_size(&list) > 0)
+	{
+		int i;
+
+		git_commit_list_node *c = (git_commit_list_node *)git_pqueue_pop(&list);
+		seen_commits++;
+
+		n = find_commit_name(data->names, &c->oid);
+
+		if (n) {
+			if (!tags && !all && n->prio < 2) {
+				unannotated_cnt++;
+			} else if (match_cnt < data->opts->max_candidates_tags) {
+				struct possible_tag *t = git__malloc(sizeof(struct commit_name));
+				GITERR_CHECK_ALLOC(t);
+				if ((error = git_vector_insert(&all_matches, t)) < 0)
+					goto cleanup;
+
+				match_cnt++;
+
+				t->name = n;
+				t->depth = seen_commits - 1;
+				t->flag_within = 1u << match_cnt;
+				t->found_order = match_cnt;
+				c->flags |= t->flag_within;
+				if (n->prio == 2)
+					annotated_cnt++;
+			}
+			else {
+				gave_up_on = c;
+				break;
+			}
+		}
+
+		for (cur_match = 0; cur_match < match_cnt; cur_match++) {
+			struct possible_tag *t = git_vector_get(&all_matches, cur_match);
+			if (!(c->flags & t->flag_within))
+				t->depth++;
+		}
+
+		if (annotated_cnt && (git_pqueue_size(&list) == 0)) {
+			/*
+			if (debug) {
+				char oid_str[GIT_OID_HEXSZ + 1];
+				git_oid_tostr(oid_str, sizeof(oid_str), &c->oid);
+
+				fprintf(stderr, "finished search at %s\n", oid_str);
+			}
+			*/
+			break;
+		}
+		for (i = 0; i < c->out_degree; i++) {
+			git_commit_list_node *p = c->parents[i];
+			if ((error = git_commit_list_parse(walk, p)) < 0)
+				goto cleanup;
+			if (!(p->flags & SEEN))
+				if ((error = git_pqueue_insert(&list, p)) < 0)
+					goto cleanup;
+			p->flags |= c->flags;
+
+			if (data->opts->only_follow_first_parent)
+				break;
+		}
+	}
+
+	if (!match_cnt) {
+		if (data->opts->show_commit_oid_as_fallback) {
+			data->result->fallback_to_id = 1;
+			git_oid_cpy(&data->result->commit_id, &cmit->oid);
+
+			goto cleanup;
+		}
+		if (unannotated_cnt) {
+			error = describe_not_found(git_commit_id(commit), 
+				"Cannot describe - "
+				"No annotated tags can describe '%s'."
+			    "However, there were unannotated tags.");
+			goto cleanup;
+		}
+		else {
+			error = describe_not_found(git_commit_id(commit), 
+				"Cannot describe - "
+				"No tags can describe '%s'.");
+			goto cleanup;
+		}
+	}
+
+	best = (struct possible_tag *)git_vector_get(&all_matches, 0);
+
+	git_vector_sort(&all_matches);
+
+	best = (struct possible_tag *)git_vector_get(&all_matches, 0);
+
+	if (gave_up_on) {
+		git_pqueue_insert(&list, gave_up_on);
+		seen_commits--;
+	}
+	if ((error = finish_depth_computation(
+		&list, walk, best)) < 0)
+		goto cleanup;
+
+	seen_commits += error;
+	if ((error = possible_tag_dup(&data->result->tag, best)) < 0)
+		goto cleanup;
+
+	/*
+	{
+		static const char *prio_names[] = {
+			"head", "lightweight", "annotated",
+		};
+
+		char oid_str[GIT_OID_HEXSZ + 1];
+
+		if (debug) {
+			for (cur_match = 0; cur_match < match_cnt; cur_match++) {
+				struct possible_tag *t = (struct possible_tag *)git_vector_get(&all_matches, cur_match);
+				fprintf(stderr, " %-11s %8d %s\n",
+					prio_names[t->name->prio],
+					t->depth, t->name->path);
+			}
+			fprintf(stderr, "traversed %lu commits\n", seen_commits);
+			if (gave_up_on) {
+				git_oid_tostr(oid_str, sizeof(oid_str), &gave_up_on->oid);
+				fprintf(stderr,
+					"more than %i tags found; listed %i most recent\n"
+					"gave up search at %s\n",
+					data->opts->max_candidates_tags, data->opts->max_candidates_tags,
+					oid_str);
+			}
+		}
+	}
+	*/
+
+	git_oid_cpy(&data->result->commit_id, &cmit->oid);
+
+cleanup:
+	{
+		size_t i;
+		struct possible_tag *match;
+		git_vector_foreach(&all_matches, i, match) {
+			git__free(match);
+		}
+	}
+	git_vector_free(&all_matches);
+	git_pqueue_free(&list);
+	git_revwalk_free(walk);
+	return error;
+}
+
+static int normalize_options(
+	git_describe_options *dst,
+	const git_describe_options *src)
+{
+	git_describe_options default_options = GIT_DESCRIBE_OPTIONS_INIT;
+	if (!src) src = &default_options;
+
+	*dst = *src;
+
+	if (dst->max_candidates_tags > GIT_DESCRIBE_DEFAULT_MAX_CANDIDATES_TAGS)
+		dst->max_candidates_tags = GIT_DESCRIBE_DEFAULT_MAX_CANDIDATES_TAGS;
+
+	return 0;
+}
+
+int git_describe_commit(
+	git_describe_result **result,
+	git_object *committish,
+	git_describe_options *opts)
+{
+	struct get_name_data data;
+	struct commit_name *name;
+	git_commit *commit;
+	int error = -1;
+	git_describe_options normalized;
+
+	assert(committish);
+
+	data.result = git__calloc(1, sizeof(git_describe_result));
+	GITERR_CHECK_ALLOC(data.result);
+	data.result->repo = git_object_owner(committish);
+
+	data.opts = opts;
+	data.repo = git_object_owner(committish);
+
+	if ((error = normalize_options(&normalized, opts)) < 0)
+		return error;
+
+	GITERR_CHECK_VERSION(
+		&normalized,
+		GIT_DESCRIBE_OPTIONS_VERSION,
+		"git_describe_options");
+
+	data.names = git_oidmap_alloc();
+	GITERR_CHECK_ALLOC(data.names);
+
+	/** TODO: contains to be implemented */
+
+	if ((error = git_object_peel((git_object **)(&commit), committish, GIT_OBJ_COMMIT)) < 0)
+		goto cleanup;
+
+	if (git_reference_foreach_name(
+			git_object_owner(committish),
+			get_name, &data) < 0)
+				goto cleanup;
+
+	if (git_oidmap_size(data.names) == 0) {
+		giterr_set(GITERR_DESCRIBE, "Cannot describe - "
+			"No reference found, cannot describe anything.");
+		error = -1;
+		goto cleanup;
+	}
+
+	if ((error = describe(&data, commit)) < 0)
+		goto cleanup;
+
+cleanup:
+	git_commit_free(commit);
+
+	git_oidmap_foreach_value(data.names, name, {
+		git_tag_free(name->tag);
+		git__free(name->path);
+		git__free(name);
+	});
+
+	git_oidmap_free(data.names);
+
+	if (error < 0)
+		git_describe_result_free(data.result);
+	else
+		*result = data.result;
+
+	return error;
+}
+
+int git_describe_workdir(
+	git_describe_result **out,
+	git_repository *repo,
+	git_describe_options *opts)
+{
+	int error;
+	git_oid current_id;
+	git_status_list *status = NULL;
+	git_status_options status_opts = GIT_STATUS_OPTIONS_INIT;
+	git_describe_result *result;
+	git_object *commit;
+
+	if ((error = git_reference_name_to_id(&current_id, repo, GIT_HEAD_FILE)) < 0)
+		return error;
+
+	if ((error = git_object_lookup(&commit, repo, &current_id, GIT_OBJ_COMMIT)) < 0)
+		return error;
+
+	/* The first step is to perform a describe of HEAD, so we can leverage this */
+	if ((error = git_describe_commit(&result, commit, opts)) < 0)
+		goto out;
+
+	if ((error = git_status_list_new(&status, repo, &status_opts)) < 0)
+		goto out;
+
+
+	if (git_status_list_entrycount(status) > 0)
+		result->dirty = 1;
+
+out:
+	git_object_free(commit);
+	git_status_list_free(status);
+
+	if (error < 0)
+		git_describe_result_free(result);
+	else
+		*out = result;
+
+	return error;
+}
+
+int git_describe_format(git_buf *out, const git_describe_result *result, const git_describe_format_options *opts)
+{
+	int error;
+	git_repository *repo;
+	struct commit_name *name;
+
+	assert(out && result);
+
+	GITERR_CHECK_VERSION(opts, GIT_DESCRIBE_FORMAT_OPTIONS_VERSION, "git_describe_format_options");
+	git_buf_sanitize(out);
+
+
+	if (opts->always_use_long_format && opts->abbreviated_size == 0) {
+		giterr_set(GITERR_DESCRIBE, "Cannot describe - "
+			"'always_use_long_format' is incompatible with a zero"
+			"'abbreviated_size'");
+		return -1;
+	}
+
+
+	repo = result->repo;
+
+	/* If we did find an exact match, then it's the easier method */
+	if (result->exact_match) {
+		name = result->name;
+		if ((error = display_name(out, repo, name)) < 0)
+			return error;
+
+		if (opts->always_use_long_format) {
+			const git_oid *id = name->tag ? git_tag_target_id(name->tag) : &result->commit_id;
+			if ((error = show_suffix(out, 0, repo, id, opts->abbreviated_size)) < 0)
+				return error;
+		}
+
+		if (result->dirty && opts->dirty_suffix)
+			git_buf_puts(out, opts->dirty_suffix);
+
+		return git_buf_oom(out) ? -1 : 0;
+	}
+
+	/* If we didn't find *any* tags, we fall back to the commit's id */
+	if (result->fallback_to_id) {
+		char hex_oid[GIT_OID_HEXSZ + 1] = {0};
+		int size;
+		if ((error = find_unique_abbrev_size(
+			     &size, repo, &result->commit_id, opts->abbreviated_size)) < 0)
+			return -1;
+
+		git_oid_fmt(hex_oid, &result->commit_id);
+		git_buf_put(out, hex_oid, size);
+
+		if (result->dirty && opts->dirty_suffix)
+			git_buf_puts(out, opts->dirty_suffix);
+
+		return git_buf_oom(out) ? -1 : 0;
+	}
+
+	/* Lastly, if we found a matching tag, we show that */
+	name = result->tag->name;
+
+	if ((error = display_name(out, repo, name)) < 0)
+		return error;
+
+	if (opts->abbreviated_size) {
+		if ((error = show_suffix(out, result->tag->depth, repo,
+			&result->commit_id, opts->abbreviated_size)) < 0)
+			return error;
+	}
+
+	if (result->dirty && opts->dirty_suffix) {
+		git_buf_puts(out, opts->dirty_suffix);
+	}
+
+	return git_buf_oom(out) ? -1 : 0;
+}
+
+void git_describe_result_free(git_describe_result *result)
+{
+	if (result == NULL)
+		return;
+
+	if (result->name) {
+		git_tag_free(result->name->tag);
+		git__free(result->name->path);
+		git__free(result->name);
+	}
+
+	if (result->tag) {
+		git_tag_free(result->tag->name->tag);
+		git__free(result->tag->name->path);
+		git__free(result->tag->name);
+		git__free(result->tag);
+	}
+
+	git__free(result);
+}
+
+int git_describe_init_options(git_describe_options *opts, unsigned int version)
+{
+	GIT_INIT_STRUCTURE_FROM_TEMPLATE(
+		opts, version, git_describe_options, GIT_DESCRIBE_OPTIONS_INIT);
+	return 0;
+}
+
+int git_describe_init_format_options(git_describe_format_options *opts, unsigned int version)
+{
+	GIT_INIT_STRUCTURE_FROM_TEMPLATE(
+		opts, version, git_describe_format_options, GIT_DESCRIBE_FORMAT_OPTIONS_INIT);
+	return 0;
+}
diff --git a/src/oidmap.h b/src/oidmap.h
index a29c7cd..b871a79 100644
--- a/src/oidmap.h
+++ b/src/oidmap.h
@@ -32,4 +32,20 @@ GIT_INLINE(khint_t) git_oidmap_hash(const git_oid *oid)
 #define git_oidmap_alloc() kh_init(oid)
 #define git_oidmap_free(h) kh_destroy(oid,h), h = NULL
 
+#define git_oidmap_lookup_index(h, k) kh_get(oid, h, k)
+#define git_oidmap_valid_index(h, idx) (idx != kh_end(h))
+
+#define git_oidmap_value_at(h, idx) kh_val(h, idx)
+
+#define git_oidmap_insert(h, key, val, rval) do { \
+	khiter_t __pos = kh_put(oid, h, key, &rval); \
+	if (rval >= 0) { \
+		if (rval == 0) kh_key(h, __pos) = key; \
+		kh_val(h, __pos) = val; \
+	} } while (0)
+
+#define git_oidmap_foreach_value kh_foreach_value
+
+#define git_oidmap_size(h) kh_size(h)
+
 #endif
diff --git a/tests/describe/describe.c b/tests/describe/describe.c
new file mode 100644
index 0000000..9a523a1
--- /dev/null
+++ b/tests/describe/describe.c
@@ -0,0 +1,50 @@
+#include "clar_libgit2.h"
+#include "describe_helpers.h"
+
+void test_describe_describe__can_describe_against_a_bare_repo(void)
+{
+	git_repository *repo;
+	git_describe_options opts = GIT_DESCRIBE_OPTIONS_INIT;
+	git_describe_format_options fmt_opts = GIT_DESCRIBE_FORMAT_OPTIONS_INIT;
+
+	cl_git_pass(git_repository_open(&repo, cl_fixture("testrepo.git")));
+
+	assert_describe("hard_tag", "HEAD", repo, &opts, &fmt_opts);
+
+	opts.show_commit_oid_as_fallback = 1;
+
+	assert_describe("be3563a*", "HEAD^", repo, &opts, &fmt_opts);
+
+	git_repository_free(repo);
+}
+
+static int delete_cb(git_reference *ref, void *payload)
+{
+	GIT_UNUSED(payload);
+
+	cl_git_pass(git_reference_delete(ref));
+	git_reference_free(ref);
+
+	return 0;
+}
+
+void test_describe_describe__cannot_describe_against_a_repo_with_no_ref(void)
+{
+	git_repository *repo;
+	git_describe_options opts = GIT_DESCRIBE_OPTIONS_INIT;
+	git_buf buf = GIT_BUF_INIT;
+	git_object *object;
+	git_describe_result *result = NULL;
+
+	repo = cl_git_sandbox_init("testrepo.git");
+	cl_git_pass(git_revparse_single(&object, repo, "HEAD"));
+
+	cl_git_pass(git_reference_foreach(repo, delete_cb, NULL));
+
+	cl_git_fail(git_describe_commit(&result, object, &opts));
+
+	git_describe_result_free(result);
+	git_object_free(object);
+	git_buf_free(&buf);
+	cl_git_sandbox_cleanup();
+}
diff --git a/tests/describe/describe_helpers.c b/tests/describe/describe_helpers.c
new file mode 100644
index 0000000..7a6a73c
--- /dev/null
+++ b/tests/describe/describe_helpers.c
@@ -0,0 +1,42 @@
+#include "describe_helpers.h"
+
+void assert_describe(
+	const char *expected_output,
+	const char *revparse_spec,
+	git_repository *repo,
+	git_describe_options *opts,
+	git_describe_format_options *fmt_opts)
+{
+	git_object *object;
+	git_buf label = GIT_BUF_INIT;
+	git_describe_result *result;
+
+	cl_git_pass(git_revparse_single(&object, repo, revparse_spec));
+
+	cl_git_pass(git_describe_commit(&result, object, opts));
+	cl_git_pass(git_describe_format(&label, result, fmt_opts));
+
+	cl_git_pass(p_fnmatch(expected_output, git_buf_cstr(&label), 0));
+
+	git_describe_result_free(result);
+	git_object_free(object);
+	git_buf_free(&label);
+}
+
+void assert_describe_workdir(
+	const char *expected_output,
+	git_repository *repo,
+	git_describe_options *opts,
+	git_describe_format_options *fmt_opts)
+{
+	git_buf label = GIT_BUF_INIT;
+	git_describe_result *result;
+
+	cl_git_pass(git_describe_workdir(&result, repo, opts));
+	cl_git_pass(git_describe_format(&label, result, fmt_opts));
+
+	cl_git_pass(p_fnmatch(expected_output, git_buf_cstr(&label), 0));
+
+	git_describe_result_free(result);
+	git_buf_free(&label);
+}
diff --git a/tests/describe/describe_helpers.h b/tests/describe/describe_helpers.h
new file mode 100644
index 0000000..16a0638
--- /dev/null
+++ b/tests/describe/describe_helpers.h
@@ -0,0 +1,15 @@
+#include "clar_libgit2.h"
+#include "buffer.h"
+
+extern void assert_describe(
+	const char *expected_output,
+	const char *revparse_spec,
+	git_repository *repo,
+	git_describe_options *opts,
+	git_describe_format_options *fmt_opts);
+
+extern void assert_describe_workdir(
+	const char *expected_output,
+	git_repository *repo,
+	git_describe_options *opts,
+	git_describe_format_options *fmt_opts);
diff --git a/tests/describe/t6120.c b/tests/describe/t6120.c
new file mode 100644
index 0000000..2377335
--- /dev/null
+++ b/tests/describe/t6120.c
@@ -0,0 +1,156 @@
+#include "clar_libgit2.h"
+#include "describe_helpers.h"
+#include "repository.h"
+
+// Ported from https://github.com/git/git/blob/adfc1857bdb090786fd9d22c1acec39371c76048/t/t6120-describe.sh
+
+static git_repository *repo;
+
+void test_describe_t6120__initialize(void)
+{
+	repo = cl_git_sandbox_init("describe");
+}
+
+void test_describe_t6120__cleanup(void)
+{
+	cl_git_sandbox_cleanup();
+}
+
+void test_describe_t6120__default(void)
+{
+	git_describe_options opts = GIT_DESCRIBE_OPTIONS_INIT;
+	git_describe_format_options fmt_opts = GIT_DESCRIBE_FORMAT_OPTIONS_INIT;
+
+	assert_describe("A-*", "HEAD", repo, &opts, &fmt_opts);
+	assert_describe("A-*", "HEAD^", repo, &opts, &fmt_opts);
+	assert_describe("R-*", "HEAD^^", repo, &opts, &fmt_opts);
+	assert_describe("A-*", "HEAD^^2", repo, &opts, &fmt_opts);
+	assert_describe("B", "HEAD^^2^", repo, &opts, &fmt_opts);
+	assert_describe("R-*", "HEAD^^^", repo, &opts, &fmt_opts);
+}
+
+void test_describe_t6120__tags(void)
+{
+	git_describe_options opts = GIT_DESCRIBE_OPTIONS_INIT;
+	git_describe_format_options fmt_opts = GIT_DESCRIBE_FORMAT_OPTIONS_INIT;
+	opts.describe_strategy = GIT_DESCRIBE_TAGS;
+
+	assert_describe("c-*", "HEAD", repo, &opts, &fmt_opts);
+	assert_describe("c-*", "HEAD^", repo, &opts, &fmt_opts);
+	assert_describe("e-*", "HEAD^^", repo, &opts, &fmt_opts);
+	assert_describe("c-*", "HEAD^^2", repo, &opts, &fmt_opts);
+	assert_describe("B", "HEAD^^2^", repo, &opts, &fmt_opts);
+	assert_describe("e", "HEAD^^^", repo, &opts, &fmt_opts);
+}
+
+void test_describe_t6120__all(void)
+{
+	git_describe_options opts = GIT_DESCRIBE_OPTIONS_INIT;
+	git_describe_format_options fmt_opts = GIT_DESCRIBE_FORMAT_OPTIONS_INIT;
+	opts.describe_strategy = GIT_DESCRIBE_ALL;
+
+	assert_describe("heads/master", "HEAD", repo, &opts, &fmt_opts);
+	assert_describe("tags/c-*", "HEAD^", repo, &opts, &fmt_opts);
+	assert_describe("tags/e", "HEAD^^^", repo, &opts, &fmt_opts);
+}
+
+void test_describe_t6120__longformat(void)
+{
+	git_describe_options opts = GIT_DESCRIBE_OPTIONS_INIT;
+	git_describe_format_options fmt_opts = GIT_DESCRIBE_FORMAT_OPTIONS_INIT;
+
+	fmt_opts.always_use_long_format = 1;
+
+	assert_describe("B-0-*", "HEAD^^2^", repo, &opts, &fmt_opts);
+	assert_describe("A-3-*", "HEAD^^2", repo, &opts, &fmt_opts);
+}
+
+void test_describe_t6120__firstparent(void)
+{
+	git_describe_options opts = GIT_DESCRIBE_OPTIONS_INIT;
+	git_describe_format_options fmt_opts = GIT_DESCRIBE_FORMAT_OPTIONS_INIT;
+	opts.describe_strategy = GIT_DESCRIBE_TAGS;
+
+	assert_describe("c-7-*", "HEAD", repo, &opts, &fmt_opts);
+
+	opts.only_follow_first_parent = 1;
+	assert_describe("e-3-*", "HEAD", repo, &opts, &fmt_opts);
+}
+
+void test_describe_t6120__workdir(void)
+{
+	git_describe_options opts = GIT_DESCRIBE_OPTIONS_INIT;
+	git_describe_format_options fmt_opts = GIT_DESCRIBE_FORMAT_OPTIONS_INIT;
+
+	assert_describe_workdir("A-*[0-9a-f]", repo, &opts, &fmt_opts);
+	cl_git_mkfile("describe/file", "something different");
+
+	fmt_opts.dirty_suffix = "-dirty";
+	assert_describe_workdir("A-*[0-9a-f]-dirty", repo, &opts, &fmt_opts);
+	fmt_opts.dirty_suffix = ".mod";
+	assert_describe_workdir("A-*[0-9a-f].mod", repo, &opts, &fmt_opts);
+}
+
+static void commit_and_tag(
+	git_time_t *time,
+	const char *commit_msg,
+	const char *tag_name)
+{
+	git_index *index;
+	git_oid commit_id;
+	git_reference *ref;
+	
+	cl_git_pass(git_repository_index__weakptr(&index, repo));
+
+	cl_git_append2file("describe/file", "\n");
+	
+	git_index_add_bypath(index, "describe/file");
+	git_index_write(index);
+
+	*time += 10;
+	cl_repo_commit_from_index(&commit_id, repo, NULL, *time, commit_msg);
+
+	if (tag_name == NULL)
+		return;
+
+	cl_git_pass(git_reference_create(&ref, repo, tag_name, &commit_id, 0, NULL, NULL));
+	git_reference_free(ref);
+}
+
+void test_describe_t6120__pattern(void)
+{
+	git_describe_options opts = GIT_DESCRIBE_OPTIONS_INIT;
+	git_describe_format_options fmt_opts = GIT_DESCRIBE_FORMAT_OPTIONS_INIT;
+	git_oid tag_id;
+	git_object *head;
+	git_signature *tagger;
+	git_time_t time;
+
+	/* set-up matching pattern tests */
+	cl_git_pass(git_revparse_single(&head, repo, "HEAD"));
+
+	time = 1380553019;
+	cl_git_pass(git_signature_new(&tagger, "tagger", "tagger@libgit2.org", time, 0));
+	cl_git_pass(git_tag_create(&tag_id, repo, "test-annotated", head, tagger, "test-annotated", 0));
+	git_signature_free(tagger);
+	git_object_free(head);
+
+	commit_and_tag(&time, "one more", "refs/tags/test1-lightweight");
+	commit_and_tag(&time, "yet another", "refs/tags/test2-lightweight");
+	commit_and_tag(&time, "even more", NULL);
+
+
+	/* Exercize */
+	opts.pattern = "test-*";
+	assert_describe("test-annotated-*", "HEAD", repo, &opts, &fmt_opts);
+
+	opts.describe_strategy = GIT_DESCRIBE_TAGS;
+	opts.pattern = "test1-*";
+	assert_describe("test1-lightweight-*", "HEAD", repo, &opts, &fmt_opts);
+
+	opts.pattern = "test2-*";
+	assert_describe("test2-lightweight-*", "HEAD", repo, &opts, &fmt_opts);
+
+	fmt_opts.always_use_long_format = 1;
+	assert_describe("test2-lightweight-*", "HEAD^", repo, &opts, &fmt_opts);
+}
diff --git a/tests/resources/describe/.gitted/HEAD b/tests/resources/describe/.gitted/HEAD
new file mode 100644
index 0000000..cb43805
--- /dev/null
+++ b/tests/resources/describe/.gitted/HEAD
@@ -0,0 +1 @@
+ref: refs/heads/master
diff --git a/tests/resources/describe/.gitted/config b/tests/resources/describe/.gitted/config
new file mode 100644
index 0000000..454e576
--- /dev/null
+++ b/tests/resources/describe/.gitted/config
@@ -0,0 +1,8 @@
+[core]
+	repositoryformatversion = 0
+	filemode = false
+	bare = false
+	logallrefupdates = true
+	symlinks = false
+	ignorecase = true
+	hideDotFiles = dotGitOnly
diff --git a/tests/resources/describe/.gitted/index b/tests/resources/describe/.gitted/index
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diff --git a/tests/resources/describe/.gitted/logs/HEAD b/tests/resources/describe/.gitted/logs/HEAD
new file mode 100644
index 0000000..fc49c6f
--- /dev/null
+++ b/tests/resources/describe/.gitted/logs/HEAD
@@ -0,0 +1,14 @@
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+4d6558b8fa764baeb0f19c1e857df91e0eda5a0f 6a12b56088706aa6c39ccd23b7c7ce60f3a0b9a1 nulltoken <emeric.fermas@gmail.com> 1380209496 +0200	commit: D
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new file mode 100644
index 0000000..fc49c6f
--- /dev/null
+++ b/tests/resources/describe/.gitted/logs/refs/heads/master
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