Simplify the long if chain in install_branch_config().

There is a long chain of if statements. The code can be more clear.
Replace the chain with table of strings. New approach is more
compact.

Signed-off-by: Paweł Wawruch <pa...@aleg.pl>
---
 branch.c | 40 ++++++++++++++++++----------------------
 1 file changed, 18 insertions(+), 22 deletions(-)

diff --git a/branch.c b/branch.c
index 723a36b..8d3b219 100644
--- a/branch.c
+++ b/branch.c
@@ -53,6 +53,18 @@ void install_branch_config(int flag, const char *local, 
const char *origin, cons
        int remote_is_branch = starts_with(remote, "refs/heads/");
        struct strbuf key = STRBUF_INIT;
        int rebasing = should_setup_rebase(origin);
+       const char *messages[] = {
+               N_("Branch %s set up to track remote branch %s from %s by 
rebasing."),
+               N_("Branch %s set up to track remote branch %s from %s."),
+               N_("Branch %s set up to track local branch %s by rebasing."),
+               N_("Branch %s set up to track local branch %s."),
+               N_("Branch %s set up to track remote ref %s by rebasing."),
+               N_("Branch %s set up to track remote ref %s."),
+               N_("Branch %s set up to track local ref %s by rebasing."),
+               N_("Branch %s set up to track local ref %s.")
+       };
+       const char *name = remote_is_branch ? remote : shortname;
+       int message_number;
 
        if (remote_is_branch
            && !strcmp(local, shortname)
@@ -77,29 +89,13 @@ void install_branch_config(int flag, const char *local, 
const char *origin, cons
        strbuf_release(&key);
 
        if (flag & BRANCH_CONFIG_VERBOSE) {
-               if (remote_is_branch && origin)
-                       printf_ln(rebasing ?
-                                 _("Branch %s set up to track remote branch %s 
from %s by rebasing.") :
-                                 _("Branch %s set up to track remote branch %s 
from %s."),
-                                 local, shortname, origin);
-               else if (remote_is_branch && !origin)
-                       printf_ln(rebasing ?
-                                 _("Branch %s set up to track local branch %s 
by rebasing.") :
-                                 _("Branch %s set up to track local branch 
%s."),
-                                 local, shortname);
-               else if (!remote_is_branch && origin)
-                       printf_ln(rebasing ?
-                                 _("Branch %s set up to track remote ref %s by 
rebasing.") :
-                                 _("Branch %s set up to track remote ref %s."),
-                                 local, remote);
-               else if (!remote_is_branch && !origin)
-                       printf_ln(rebasing ?
-                                 _("Branch %s set up to track local ref %s by 
rebasing.") :
-                                 _("Branch %s set up to track local ref %s."),
-                                 local, remote);
+               message_number = (!!rebasing) + 2 * (!!origin) + 4 * 
(!!remote_is_branch);
+               assert(message_number < ARRAY_SIZE(messages));
+
+               if (message_number < 2)
+                       printf_ln(messages[message_number], local, name, 
origin);
                else
-                       die("BUG: impossible combination of %d and %p",
-                           remote_is_branch, origin);
+                       printf_ln(messages[message_number], local, name);
        }
 }
 
-- 
1.8.3.2

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