apply: move 'struct apply_state' to apply.h

To libify `git apply` functionality we must make 'struct apply_state'
usable outside "builtin/apply.c".

Let's do that by creating a new "apply.h" and moving
'struct apply_state' there.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

apply.h

@@ -0,0 +1,100 @@
+#ifndef APPLY_H
+#define APPLY_H
+
+enum apply_ws_error_action {
+	nowarn_ws_error,
+	warn_on_ws_error,
+	die_on_ws_error,
+	correct_ws_error
+};
+
+enum apply_ws_ignore {
+	ignore_ws_none,
+	ignore_ws_change
+};
+
+/*
+ * We need to keep track of how symlinks in the preimage are
+ * manipulated by the patches.  A patch to add a/b/c where a/b
+ * is a symlink should not be allowed to affect the directory
+ * the symlink points at, but if the same patch removes a/b,
+ * it is perfectly fine, as the patch removes a/b to make room
+ * to create a directory a/b so that a/b/c can be created.
+ *
+ * See also "struct string_list symlink_changes" in "struct
+ * apply_state".
+ */
+#define APPLY_SYMLINK_GOES_AWAY 01
+#define APPLY_SYMLINK_IN_RESULT 02
+
+struct apply_state {
+	const char *prefix;
+	int prefix_length;
+
+	/* These are lock_file related */
+	struct lock_file *lock_file;
+	int newfd;
+
+	/* These control what gets looked at and modified */
+	int apply; /* this is not a dry-run */
+	int cached; /* apply to the index only */
+	int check; /* preimage must match working tree, don't actually apply */
+	int check_index; /* preimage must match the indexed version */
+	int update_index; /* check_index && apply */
+
+	/* These control cosmetic aspect of the output */
+	int diffstat; /* just show a diffstat, and don't actually apply */
+	int numstat; /* just show a numeric diffstat, and don't actually apply */
+	int summary; /* just report creation, deletion, etc, and don't actually apply */
+
+	/* These boolean parameters control how the apply is done */
+	int allow_overlap;
+	int apply_in_reverse;
+	int apply_with_reject;
+	int apply_verbosely;
+	int no_add;
+	int threeway;
+	int unidiff_zero;
+	int unsafe_paths;
+
+	/* Other non boolean parameters */
+	const char *fake_ancestor;
+	const char *patch_input_file;
+	int line_termination;
+	struct strbuf root;
+	int p_value;
+	int p_value_known;
+	unsigned int p_context;
+
+	/* Exclude and include path parameters */
+	struct string_list limit_by_name;
+	int has_include;
+
+	/* Various "current state" */
+	int linenr; /* current line number */
+	struct string_list symlink_changes; /* we have to track symlinks */
+
+	/*
+	 * For "diff-stat" like behaviour, we keep track of the biggest change
+	 * we've seen, and the longest filename. That allows us to do simple
+	 * scaling.
+	 */
+	int max_change;
+	int max_len;
+
+	/*
+	 * Records filenames that have been touched, in order to handle
+	 * the case where more than one patches touch the same file.
+	 */
+	struct string_list fn_table;
+
+	/* These control whitespace errors */
+	enum apply_ws_error_action ws_error_action;
+	enum apply_ws_ignore ws_ignore_action;
+	const char *whitespace_option;
+	int whitespace_error;
+	int squelch_whitespace_errors;
+	int applied_after_fixing_ws;
+};
+
+#endif

builtin/apply.c

@@ -20,103 +20,7 @@
 #include "xdiff-interface.h"
 #include "ll-merge.h"
 #include "rerere.h"
-
-enum apply_ws_error_action {
-	nowarn_ws_error,
-	warn_on_ws_error,
-	die_on_ws_error,
-	correct_ws_error
-};
-
-
-enum apply_ws_ignore {
-	ignore_ws_none,
-	ignore_ws_change
-};
-
-/*
- * We need to keep track of how symlinks in the preimage are
- * manipulated by the patches.  A patch to add a/b/c where a/b
- * is a symlink should not be allowed to affect the directory
- * the symlink points at, but if the same patch removes a/b,
- * it is perfectly fine, as the patch removes a/b to make room
- * to create a directory a/b so that a/b/c can be created.
- *
- * See also "struct string_list symlink_changes" in "struct
- * apply_state".
- */
-#define APPLY_SYMLINK_GOES_AWAY 01
-#define APPLY_SYMLINK_IN_RESULT 02
-
-struct apply_state {
-	const char *prefix;
-	int prefix_length;
-
-	/* These are lock_file related */
-	struct lock_file *lock_file;
-	int newfd;
-
-	/* These control what gets looked at and modified */
-	int apply; /* this is not a dry-run */
-	int cached; /* apply to the index only */
-	int check; /* preimage must match working tree, don't actually apply */
-	int check_index; /* preimage must match the indexed version */
-	int update_index; /* check_index && apply */
-
-	/* These control cosmetic aspect of the output */
-	int diffstat; /* just show a diffstat, and don't actually apply */
-	int numstat; /* just show a numeric diffstat, and don't actually apply */
-	int summary; /* just report creation, deletion, etc, and don't actually apply */
-
-	/* These boolean parameters control how the apply is done */
-	int allow_overlap;
-	int apply_in_reverse;
-	int apply_with_reject;
-	int apply_verbosely;
-	int no_add;
-	int threeway;
-	int unidiff_zero;
-	int unsafe_paths;
-
-	/* Other non boolean parameters */
-	const char *fake_ancestor;
-	const char *patch_input_file;
-	int line_termination;
-	struct strbuf root;
-	int p_value;
-	int p_value_known;
-	unsigned int p_context;
-
-	/* Exclude and include path parameters */
-	struct string_list limit_by_name;
-	int has_include;
-
-	/* Various "current state" */
-	int linenr; /* current line number */
-	struct string_list symlink_changes; /* we have to track symlinks */
-
-	/*
-	 * For "diff-stat" like behaviour, we keep track of the biggest change
-	 * we've seen, and the longest filename. That allows us to do simple
-	 * scaling.
-	 */
-	int max_change;
-	int max_len;
-
-	/*
-	 * Records filenames that have been touched, in order to handle
-	 * the case where more than one patches touch the same file.
-	 */
-	struct string_list fn_table;
-
-	/* These control whitespace errors */
-	enum apply_ws_error_action ws_error_action;
-	enum apply_ws_ignore ws_ignore_action;
-	const char *whitespace_option;
-	int whitespace_error;
-	int squelch_whitespace_errors;
-	int applied_after_fixing_ws;
-};
+#include "apply.h"
 
 static const char * const apply_usage[] = {
 	N_("git apply [<options>] [<patch>...]"),