Merge branch 'nd/builtin-to-libgit'

Code cleanups so that libgit.a does not depend on anything in the
builtin/ directory.

* nd/builtin-to-libgit:
  fetch-pack: move core code to libgit.a
  fetch-pack: remove global (static) configuration variable "args"
  send-pack: move core code to libgit.a
  Move setup_diff_pager to libgit.a
  Move print_commit_list to libgit.a
  Move estimate_bisect_steps to libgit.a
  Move try_merge_command and checkout_fast_forward to libgit.a

Makefile

@@ -746,6 +746,7 @@ LIB_OBJS += editor.o
 LIB_OBJS += entry.o
 LIB_OBJS += environment.o
 LIB_OBJS += exec_cmd.o
+LIB_OBJS += fetch-pack.o
 LIB_OBJS += fsck.o
 LIB_OBJS += gettext.o
 LIB_OBJS += gpg-interface.o
@@ -763,6 +764,7 @@ LIB_OBJS += lockfile.o
 LIB_OBJS += log-tree.o
 LIB_OBJS += mailmap.o
 LIB_OBJS += match-trees.o
+LIB_OBJS += merge.o
 LIB_OBJS += merge-file.o
 LIB_OBJS += merge-recursive.o
 LIB_OBJS += mergesort.o
@@ -797,6 +799,7 @@ LIB_OBJS += rerere.o
 LIB_OBJS += resolve-undo.o
 LIB_OBJS += revision.o
 LIB_OBJS += run-command.o
+LIB_OBJS += send-pack.o
 LIB_OBJS += sequencer.o
 LIB_OBJS += server-info.o
 LIB_OBJS += setup.o

bisect.c

@@ -956,3 +956,41 @@ int bisect_next_all(const char *prefix, int no_checkout)
 	return bisect_checkout(bisect_rev_hex, no_checkout);
 }
 
+static inline int log2i(int n)
+{
+	int log2 = 0;
+
+	for (; n > 1; n >>= 1)
+		log2++;
+
+	return log2;
+}
+
+static inline int exp2i(int n)
+{
+	return 1 << n;
+}
+
+/*
+ * Estimate the number of bisect steps left (after the current step)
+ *
+ * For any x between 0 included and 2^n excluded, the probability for
+ * n - 1 steps left looks like:
+ *
+ * P(2^n + x) == (2^n - x) / (2^n + x)
+ *
+ * and P(2^n + x) < 0.5 means 2^n < 3x
+ */
+int estimate_bisect_steps(int all)
+{
+	int n, x, e;
+
+	if (all < 3)
+		return 0;
+
+	n = log2i(all);
+	e = exp2i(n);
+	x = all - e;
+
+	return (e < 3 * x) ? n : n - 1;
+}

bisect.h

@@ -11,10 +11,6 @@ extern struct commit_list *filter_skipped(struct commit_list *list,
 					  int *count,
 					  int *skipped_first);
 
-extern void print_commit_list(struct commit_list *list,
-			      const char *format_cur,
-			      const char *format_last);
-
 #define BISECT_SHOW_ALL		(1<<0)
 #define REV_LIST_QUIET		(1<<1)
 

builtin.h

@@ -37,10 +37,6 @@ int copy_note_for_rewrite(struct notes_rewrite_cfg *c,
 			  const unsigned char *from_obj, const unsigned char *to_obj);
 void finish_copy_notes_for_rewrite(struct notes_rewrite_cfg *c);
 
-extern int check_pager_config(const char *cmd);
-struct diff_options;
-extern void setup_diff_pager(struct diff_options *);
-
 extern int textconv_object(const char *path, unsigned mode, const unsigned char *sha1, int sha1_valid, char **buf, unsigned long *buf_size);
 
 extern int cmd_add(int argc, const char **argv, const char *prefix);

builtin/diff.c

@@ -418,19 +418,3 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
 		refresh_index_quietly();
 	return result;
 }
-
-void setup_diff_pager(struct diff_options *opt)
-{
-	/*
-	 * If the user asked for our exit code, then either they want --quiet
-	 * or --exit-code. We should definitely not bother with a pager in the
-	 * former case, as we will generate no output. Since we still properly
-	 * report our exit code even when a pager is run, we _could_ run a
-	 * pager with --exit-code. But since we have not done so historically,
-	 * and because it is easy to find people oneline advising "git diff
-	 * --exit-code" in hooks and other scripts, we do not do so.
-	 */
-	if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
-	    check_pager_config("diff") != 0)
-		setup_pager();
-}