To libify `git apply` functionality we must make init_apply_state()
usable outside "builtin/apply.c".

Let's do that by moving it into a new "apply.c".

Helped-by: Eric Sunshine <sunsh...@sunshineco.com>
Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
---
 Makefile        |  1 +
 apply.c         | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 apply.h         | 10 ++++++
 builtin/apply.c | 91 -------------------------------------------------------
 4 files changed, 105 insertions(+), 91 deletions(-)
 create mode 100644 apply.c

diff --git a/Makefile b/Makefile
index d96ecb7..c6ac236 100644
--- a/Makefile
+++ b/Makefile
@@ -691,6 +691,7 @@ LIB_OBJS += abspath.o
 LIB_OBJS += advice.o
 LIB_OBJS += alias.o
 LIB_OBJS += alloc.o
+LIB_OBJS += apply.o
 LIB_OBJS += archive.o
 LIB_OBJS += archive-tar.o
 LIB_OBJS += archive-zip.o
diff --git a/apply.c b/apply.c
new file mode 100644
index 0000000..c858ca4
--- /dev/null
+++ b/apply.c
@@ -0,0 +1,94 @@
+#include "cache.h"
+#include "lockfile.h"
+#include "apply.h"
+
+static void git_apply_config(void)
+{
+       git_config_get_string_const("apply.whitespace", 
&apply_default_whitespace);
+       git_config_get_string_const("apply.ignorewhitespace", 
&apply_default_ignorewhitespace);
+       git_config(git_default_config, NULL);
+}
+
+int parse_whitespace_option(struct apply_state *state, const char *option)
+{
+       if (!option) {
+               state->ws_error_action = warn_on_ws_error;
+               return 0;
+       }
+       if (!strcmp(option, "warn")) {
+               state->ws_error_action = warn_on_ws_error;
+               return 0;
+       }
+       if (!strcmp(option, "nowarn")) {
+               state->ws_error_action = nowarn_ws_error;
+               return 0;
+       }
+       if (!strcmp(option, "error")) {
+               state->ws_error_action = die_on_ws_error;
+               return 0;
+       }
+       if (!strcmp(option, "error-all")) {
+               state->ws_error_action = die_on_ws_error;
+               state->squelch_whitespace_errors = 0;
+               return 0;
+       }
+       if (!strcmp(option, "strip") || !strcmp(option, "fix")) {
+               state->ws_error_action = correct_ws_error;
+               return 0;
+       }
+       return error(_("unrecognized whitespace option '%s'"), option);
+}
+
+int parse_ignorewhitespace_option(struct apply_state *state,
+                                 const char *option)
+{
+       if (!option || !strcmp(option, "no") ||
+           !strcmp(option, "false") || !strcmp(option, "never") ||
+           !strcmp(option, "none")) {
+               state->ws_ignore_action = ignore_ws_none;
+               return 0;
+       }
+       if (!strcmp(option, "change")) {
+               state->ws_ignore_action = ignore_ws_change;
+               return 0;
+       }
+       return error(_("unrecognized whitespace ignore option '%s'"), option);
+}
+
+void init_apply_state(struct apply_state *state,
+                     const char *prefix,
+                     struct lock_file *lock_file)
+{
+       memset(state, 0, sizeof(*state));
+       state->prefix = prefix;
+       state->prefix_length = state->prefix ? strlen(state->prefix) : 0;
+       state->lock_file = lock_file;
+       state->newfd = -1;
+       state->apply = 1;
+       state->line_termination = '\n';
+       state->p_value = 1;
+       state->p_context = UINT_MAX;
+       state->squelch_whitespace_errors = 5;
+       state->ws_error_action = warn_on_ws_error;
+       state->ws_ignore_action = ignore_ws_none;
+       state->linenr = 1;
+       string_list_init(&state->fn_table, 0);
+       string_list_init(&state->limit_by_name, 0);
+       string_list_init(&state->symlink_changes, 0);
+       strbuf_init(&state->root, 0);
+
+       git_apply_config();
+       if (apply_default_whitespace && parse_whitespace_option(state, 
apply_default_whitespace))
+               exit(1);
+       if (apply_default_ignorewhitespace && 
parse_ignorewhitespace_option(state, apply_default_ignorewhitespace))
+               exit(1);
+}
+
+void clear_apply_state(struct apply_state *state)
+{
+       string_list_clear(&state->limit_by_name, 0);
+       string_list_clear(&state->symlink_changes, 0);
+       strbuf_release(&state->root);
+
+       /* &state->fn_table is cleared at the end of apply_patch() */
+}
diff --git a/apply.h b/apply.h
index 7493a40..08c0a25 100644
--- a/apply.h
+++ b/apply.h
@@ -97,4 +97,14 @@ struct apply_state {
        int applied_after_fixing_ws;
 };
 
+extern int parse_whitespace_option(struct apply_state *state,
+                                  const char *option);
+extern int parse_ignorewhitespace_option(struct apply_state *state,
+                                        const char *option);
+
+extern void init_apply_state(struct apply_state *state,
+                            const char *prefix,
+                            struct lock_file *lock_file);
+extern void clear_apply_state(struct apply_state *state);
+
 #endif
diff --git a/builtin/apply.c b/builtin/apply.c
index ecb1f7a..bb6ff77 100644
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -27,52 +27,6 @@ static const char * const apply_usage[] = {
        NULL
 };
 
-static int parse_whitespace_option(struct apply_state *state, const char 
*option)
-{
-       if (!option) {
-               state->ws_error_action = warn_on_ws_error;
-               return 0;
-       }
-       if (!strcmp(option, "warn")) {
-               state->ws_error_action = warn_on_ws_error;
-               return 0;
-       }
-       if (!strcmp(option, "nowarn")) {
-               state->ws_error_action = nowarn_ws_error;
-               return 0;
-       }
-       if (!strcmp(option, "error")) {
-               state->ws_error_action = die_on_ws_error;
-               return 0;
-       }
-       if (!strcmp(option, "error-all")) {
-               state->ws_error_action = die_on_ws_error;
-               state->squelch_whitespace_errors = 0;
-               return 0;
-       }
-       if (!strcmp(option, "strip") || !strcmp(option, "fix")) {
-               state->ws_error_action = correct_ws_error;
-               return 0;
-       }
-       return error(_("unrecognized whitespace option '%s'"), option);
-}
-
-static int parse_ignorewhitespace_option(struct apply_state *state,
-                                        const char *option)
-{
-       if (!option || !strcmp(option, "no") ||
-           !strcmp(option, "false") || !strcmp(option, "never") ||
-           !strcmp(option, "none")) {
-               state->ws_ignore_action = ignore_ws_none;
-               return 0;
-       }
-       if (!strcmp(option, "change")) {
-               state->ws_ignore_action = ignore_ws_change;
-               return 0;
-       }
-       return error(_("unrecognized whitespace ignore option '%s'"), option);
-}
-
 static void set_default_whitespace_mode(struct apply_state *state)
 {
        if (!state->whitespace_option && !apply_default_whitespace)
@@ -4539,13 +4493,6 @@ static int apply_patch(struct apply_state *state,
        return res;
 }
 
-static void git_apply_config(void)
-{
-       git_config_get_string_const("apply.whitespace", 
&apply_default_whitespace);
-       git_config_get_string_const("apply.ignorewhitespace", 
&apply_default_ignorewhitespace);
-       git_config(git_default_config, NULL);
-}
-
 static int option_parse_exclude(const struct option *opt,
                                const char *arg, int unset)
 {
@@ -4604,44 +4551,6 @@ static int option_parse_directory(const struct option 
*opt,
        return 0;
 }
 
-static void init_apply_state(struct apply_state *state,
-                            const char *prefix,
-                            struct lock_file *lock_file)
-{
-       memset(state, 0, sizeof(*state));
-       state->prefix = prefix;
-       state->prefix_length = state->prefix ? strlen(state->prefix) : 0;
-       state->lock_file = lock_file;
-       state->newfd = -1;
-       state->apply = 1;
-       state->line_termination = '\n';
-       state->p_value = 1;
-       state->p_context = UINT_MAX;
-       state->squelch_whitespace_errors = 5;
-       state->ws_error_action = warn_on_ws_error;
-       state->ws_ignore_action = ignore_ws_none;
-       state->linenr = 1;
-       string_list_init(&state->fn_table, 0);
-       string_list_init(&state->limit_by_name, 0);
-       string_list_init(&state->symlink_changes, 0);
-       strbuf_init(&state->root, 0);
-
-       git_apply_config();
-       if (apply_default_whitespace && parse_whitespace_option(state, 
apply_default_whitespace))
-               exit(1);
-       if (apply_default_ignorewhitespace && 
parse_ignorewhitespace_option(state, apply_default_ignorewhitespace))
-               exit(1);
-}
-
-static void clear_apply_state(struct apply_state *state)
-{
-       string_list_clear(&state->limit_by_name, 0);
-       string_list_clear(&state->symlink_changes, 0);
-       strbuf_release(&state->root);
-
-       /* &state->fn_table is cleared at the end of apply_patch() */
-}
-
 static void check_apply_state(struct apply_state *state, int force_apply)
 {
        int is_not_gitdir = !startup_info->have_repository;
-- 
2.10.0.41.g9df52c3

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