Add missing includes and forward declarations

I looped over the toplevel header files, creating a temporary two-line C
program for each consisting of
  #include "git-compat-util.h"
  #include $HEADER
This patch is the result of manually fixing errors in compiling those
tiny programs.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

alloc.h

@@ -1,9 +1,11 @@
 #ifndef ALLOC_H
 #define ALLOC_H
 
+struct alloc_state;
 struct tree;
 struct commit;
 struct tag;
+struct repository;
 
 void *alloc_blob_node(struct repository *r);
 void *alloc_tree_node(struct repository *r);

apply.h

@@ -1,6 +1,9 @@
 #ifndef APPLY_H
 #define APPLY_H
 
+#include "lockfile.h"
+#include "string-list.h"
+
 enum apply_ws_error_action {
 	nowarn_ws_error,
 	warn_on_ws_error,

archive.h

@@ -1,6 +1,7 @@
 #ifndef ARCHIVE_H
 #define ARCHIVE_H
 
+#include "cache.h"
 #include "pathspec.h"
 
 struct archiver_args {

attr.h

@@ -7,6 +7,7 @@ struct git_attr;
 /* opaque structures used internally for attribute collection */
 struct all_attrs_item;
 struct attr_stack;
+struct index_state;
 
 /*
  * Given a string, return the gitattribute object that

bisect.h

@@ -1,6 +1,8 @@
 #ifndef BISECT_H
 #define BISECT_H
 
+struct commit_list;
+
 /*
  * Find bisection. If something is found, `reaches` will be the number of
  * commits that the best commit reaches. `all` will be the count of

branch.h

@@ -1,6 +1,8 @@
 #ifndef BRANCH_H
 #define BRANCH_H
 
+struct strbuf;
+
 /* Functions for acting on the information about branches. */
 
 /*

bulk-checkin.h

@@ -4,6 +4,8 @@
 #ifndef BULK_CHECKIN_H
 #define BULK_CHECKIN_H
 
+#include "cache.h"
+
 extern int index_bulk_checkin(struct object_id *oid,
 			      int fd, size_t size, enum object_type type,
 			      const char *path, unsigned flags);

column.h

@@ -36,6 +36,7 @@ static inline int column_active(unsigned int colopts)
 	return (colopts & COL_ENABLE_MASK) == COL_ENABLED;
 }
 
+struct string_list;
 extern void print_columns(const struct string_list *list, unsigned int colopts,
 			  const struct column_options *opts);
 

commit-graph.h

@@ -4,6 +4,7 @@
 #include "git-compat-util.h"
 #include "repository.h"
 #include "string-list.h"
+#include "cache.h"
 
 struct commit;
 

config.h

@@ -1,6 +1,11 @@
 #ifndef CONFIG_H
 #define CONFIG_H
 
+#include "hashmap.h"
+#include "string-list.h"
+
+struct object_id;
+
 /* git_config_parse_key() returns these negated: */
 #define CONFIG_INVALID_KEY 1
 #define CONFIG_NO_SECTION_OR_NAME 2

connected.h

@@ -1,6 +1,7 @@
 #ifndef CONNECTED_H
 #define CONNECTED_H
 
+struct object_id;
 struct transport;
 
 /*

convert.h

@@ -7,6 +7,8 @@
 #include "string-list.h"
 
 struct index_state;
+struct object_id;
+struct strbuf;
 
 #define CONV_EOL_RNDTRP_DIE   (1<<0) /* Die if CRLF to LF to CRLF is different */
 #define CONV_EOL_RNDTRP_WARN  (1<<1) /* Warn if CRLF to LF to CRLF is different */

csum-file.h

@@ -1,6 +1,8 @@
 #ifndef CSUM_FILE_H
 #define CSUM_FILE_H
 
+#include "hash.h"
+
 struct progress;
 
 /* A SHA1-protected file */

diffcore.h

@@ -4,6 +4,10 @@
 #ifndef DIFFCORE_H
 #define DIFFCORE_H
 
+#include "cache.h"
+
+struct diff_options;
+
 /* This header file is internal between diff.c and its diff transformers
  * (e.g. diffcore-rename, diffcore-pickaxe).  Never include this header
  * in anything else.

dir-iterator.h

@@ -1,6 +1,8 @@
 #ifndef DIR_ITERATOR_H
 #define DIR_ITERATOR_H
 
+#include "strbuf.h"
+
 /*
  * Iterate over a directory tree.
  *

fsck.h

@@ -6,6 +6,7 @@
 #define FSCK_IGNORE 3
 
 struct fsck_options;
+struct object;
 
 void fsck_set_msg_type(struct fsck_options *options,
 		const char *msg_id, const char *msg_type);

fsmonitor.h

@@ -1,6 +1,9 @@
 #ifndef FSMONITOR_H
 #define FSMONITOR_H
 
+#include "cache.h"
+#include "dir.h"
+
 extern struct trace_key trace_fsmonitor;
 
 /*

gpg-interface.h

@@ -1,6 +1,8 @@
 #ifndef GPG_INTERFACE_H
 #define GPG_INTERFACE_H
 
+struct strbuf;
+
 #define GPG_VERIFY_VERBOSE		1
 #define GPG_VERIFY_RAW			2
 #define GPG_VERIFY_OMIT_STATUS	4

khash.h

@@ -26,6 +26,9 @@
 #ifndef __AC_KHASH_H
 #define __AC_KHASH_H
 
+#include "cache.h"
+#include "hashmap.h"
+
 #define AC_VERSION_KHASH_H "0.2.8"
 
 typedef uint32_t khint32_t;

list-objects-filter.h

@@ -1,6 +1,10 @@
 #ifndef LIST_OBJECTS_FILTER_H
 #define LIST_OBJECTS_FILTER_H
 
+struct list_objects_filter_options;
+struct object;
+struct oidset;
+
 /*
  * During list-object traversal we allow certain objects to be
  * filtered (omitted) from the result.  The active filter uses

list-objects.h

@@ -1,6 +1,10 @@
 #ifndef LIST_OBJECTS_H
 #define LIST_OBJECTS_H
 
+struct commit;
+struct object;
+struct rev_info;
+
 typedef void (*show_commit_fn)(struct commit *, void *);
 typedef void (*show_object_fn)(struct object *, const char *, void *);
 void traverse_commit_list(struct rev_info *, show_commit_fn, show_object_fn, void *);

ll-merge.h

@@ -5,6 +5,8 @@
 #ifndef LL_MERGE_H
 #define LL_MERGE_H
 
+#include "xdiff/xdiff.h"
+
 struct ll_merge_options {
 	unsigned virtual_ancestor : 1;
 	unsigned variant : 2;	/* favor ours, favor theirs, or union merge */

mailinfo.h

@@ -1,6 +1,8 @@
 #ifndef MAILINFO_H
 #define MAILINFO_H
 
+#include "strbuf.h"
+
 #define MAX_BOUNDARIES 5
 
 struct mailinfo {

mailmap.h

@@ -1,6 +1,8 @@
 #ifndef MAILMAP_H
 #define MAILMAP_H
 
+struct string_list;
+
 int read_mailmap(struct string_list *map, char **repo_abbrev);
 void clear_mailmap(struct string_list *map);
 

merge-recursive.h

@@ -1,8 +1,10 @@
 #ifndef MERGE_RECURSIVE_H
 #define MERGE_RECURSIVE_H
 
-#include "unpack-trees.h"
 #include "string-list.h"
+#include "unpack-trees.h"
+
+struct commit;
 
 struct merge_options {
 	const char *ancestor;

notes-merge.h

@@ -2,6 +2,10 @@
 #define NOTES_MERGE_H
 
 #include "notes-utils.h"
+#include "strbuf.h"
+
+struct commit;
+struct object_id;
 
 #define NOTES_MERGE_WORKTREE "NOTES_MERGE_WORKTREE"
 

notes-utils.h

@@ -3,6 +3,9 @@
 
 #include "notes.h"
 
+struct commit_list;
+struct object_id;
+
 /*
  * Create new notes commit from the given notes tree
  *

notes.h

@@ -3,6 +3,9 @@
 
 #include "string-list.h"
 
+struct object_id;
+struct strbuf;
+
 /*
  * Function type for combining two notes annotating the same object.
  *

object-store.h

@@ -1,6 +1,7 @@
 #ifndef OBJECT_STORE_H
 #define OBJECT_STORE_H
 
+#include "cache.h"
 #include "oidmap.h"
 #include "list.h"
 #include "sha1-array.h"

object.h

@@ -1,6 +1,8 @@
 #ifndef OBJECT_H
 #define OBJECT_H
 
+#include "cache.h"
+
 struct buffer_slab;
 
 struct parsed_object_pool {

oidmap.h

@@ -1,6 +1,7 @@
 #ifndef OIDMAP_H
 #define OIDMAP_H
 
+#include "cache.h"
 #include "hashmap.h"
 
 /*

pack-bitmap.h

@@ -5,6 +5,9 @@
 #include "khash.h"
 #include "pack-objects.h"
 
+struct commit;
+struct rev_info;
+
 struct bitmap_disk_header {
 	char magic[4];
 	uint16_t version;

pack-objects.h

@@ -2,6 +2,7 @@
 #define PACK_OBJECTS_H
 
 #include "object-store.h"
+#include "pack.h"
 
 #define DEFAULT_DELTA_CACHE_SIZE (256 * 1024 * 1024)
 

patch-ids.h

@@ -1,6 +1,12 @@
 #ifndef PATCH_IDS_H
 #define PATCH_IDS_H
 
+#include "diff.h"
+#include "hashmap.h"
+
+struct commit;
+struct object_id;
+
 struct patch_id {
 	struct hashmap_entry ent;
 	struct object_id patch_id;

path.h

@@ -2,6 +2,7 @@
 #define PATH_H
 
 struct repository;
+struct strbuf;
 
 /*
  * The result to all functions which return statically allocated memory may be

pathspec.h

@@ -1,6 +1,8 @@
 #ifndef PATHSPEC_H
 #define PATHSPEC_H
 
+struct index_state;
+
 /* Pathspec magic */
 #define PATHSPEC_FROMTOP	(1<<0)
 #define PATHSPEC_MAXDEPTH	(1<<1)

pretty.h

@@ -1,7 +1,11 @@
 #ifndef PRETTY_H
 #define PRETTY_H
 
+#include "cache.h"
+#include "string-list.h"
+
 struct commit;
+struct strbuf;
 
 /* Commit formats */
 enum cmit_fmt {

reachable.h

@@ -2,6 +2,8 @@
 #define REACHEABLE_H
 
 struct progress;
+struct rev_info;
+
 extern int add_unseen_recent_objects_to_traversal(struct rev_info *revs,
 						  timestamp_t timestamp);
 extern void mark_reachable_objects(struct rev_info *revs, int mark_reflog,

reflog-walk.h

@@ -3,6 +3,7 @@
 
 #include "cache.h"
 
+struct commit;
 struct reflog_walk_info;
 
 extern void init_reflog_walk(struct reflog_walk_info **info);

refs.h

@@ -3,8 +3,10 @@
 
 struct object_id;
 struct ref_store;
+struct repository;
 struct strbuf;
 struct string_list;
+struct string_list_item;
 struct worktree;
 
 /*

remote.h

@@ -1,6 +1,7 @@
 #ifndef REMOTE_H
 #define REMOTE_H
 
+#include "cache.h"
 #include "parse-options.h"
 #include "hashmap.h"
 #include "refspec.h"

repository.h

@@ -1,6 +1,8 @@
 #ifndef REPOSITORY_H
 #define REPOSITORY_H
 
+#include "path.h"
+
 struct config_set;
 struct git_hash_algo;
 struct index_state;

resolve-undo.h

@@ -1,6 +1,8 @@
 #ifndef RESOLVE_UNDO_H
 #define RESOLVE_UNDO_H
 
+#include "cache.h"
+
 struct resolve_undo_info {
 	unsigned int mode[3];
 	struct object_id oid[3];

revision.h

@@ -1,6 +1,7 @@
 #ifndef REVISION_H
 #define REVISION_H
 
+#include "commit.h"
 #include "parse-options.h"
 #include "grep.h"
 #include "notes.h"

send-pack.h

@@ -3,6 +3,10 @@
 
 #include "string-list.h"
 
+struct child_process;
+struct oid_array;
+struct ref;
+
 /* Possible values for push_cert field in send_pack_args. */
 #define SEND_PACK_PUSH_CERT_NEVER 0
 #define SEND_PACK_PUSH_CERT_IF_ASKED 1

sequencer.h

@@ -1,6 +1,11 @@
 #ifndef SEQUENCER_H
 #define SEQUENCER_H
 
+#include "cache.h"
+#include "strbuf.h"
+
+struct commit;
+
 const char *git_path_commit_editmsg(void);
 const char *git_path_seq_dir(void);
 

shortlog.h

@@ -3,6 +3,8 @@
 
 #include "string-list.h"
 
+struct commit;
+
 struct shortlog {
 	struct string_list list;
 	int summary;

submodule.h

@@ -1,11 +1,17 @@
 #ifndef SUBMODULE_H
 #define SUBMODULE_H
 
-struct repository;
-struct diff_options;
 struct argv_array;
+struct cache_entry;
+struct diff_options;
+struct index_state;
+struct object_id;
 struct oid_array;
+struct pathspec;
 struct remote;
+struct repository;
+struct string_list;
+struct strbuf;
 
 enum {
 	RECURSE_SUBMODULES_ONLY = -5,

tempfile.h

@@ -2,6 +2,7 @@
 #define TEMPFILE_H
 
 #include "list.h"
+#include "strbuf.h"
 
 /*
  * Handle temporary files.

trailer.h

@@ -3,6 +3,8 @@
 
 #include "list.h"
 
+struct strbuf;
+
 enum trailer_where {
 	WHERE_DEFAULT,
 	WHERE_END,

tree-walk.h

@@ -1,6 +1,8 @@
 #ifndef TREE_WALK_H
 #define TREE_WALK_H
 
+struct strbuf;
+
 struct name_entry {
 	const struct object_id *oid;
 	const char *path;

unpack-trees.h

@@ -1,11 +1,14 @@
 #ifndef UNPACK_TREES_H
 #define UNPACK_TREES_H
 
-#include "tree-walk.h"
+#include "cache.h"
 #include "argv-array.h"
+#include "string-list.h"
+#include "tree-walk.h"
 
 #define MAX_UNPACK_TREES 8
 
+struct cache_entry;
 struct unpack_trees_options;
 struct exclude_list;
 

url.h

@@ -1,6 +1,8 @@
 #ifndef URL_H
 #define URL_H
 
+struct strbuf;
+
 extern int is_url(const char *url);
 extern int is_urlschemechar(int first_flag, int ch);
 extern char *url_decode(const char *url);

utf8.h

@@ -1,6 +1,8 @@
 #ifndef GIT_UTF8_H
 #define GIT_UTF8_H
 
+struct strbuf;
+
 typedef unsigned int ucs_char_t;  /* assuming 32bit int */
 
 size_t display_mode_esc_sequence_len(const char *s);

worktree.h

@@ -1,6 +1,7 @@
 #ifndef WORKTREE_H
 #define WORKTREE_H
 
+#include "cache.h"
 #include "refs.h"
 
 struct strbuf;