[PATCH 6/7] mergetools: Fix difftool/mergetool --tool-help listing for vim

"git difftool --tool-help" and "git mergetool --tool-help" incorreclty
list "vim" as being an unavailable tool.  This is because they attempt
to find a tool named according to the mergetool scriptlet instead of the Git-
recognized tool name.

vimdiff, vimdiff2, gvimdiff, and gvimdiff2 are all provided by the "vim"
scriptlet.  This required git-mergetool--lib to special-case it when
setting up the tool.

Remove the exception for "vim" and allow the scriptlets to be found
naturally by using symlinks to a single "vimdiff" scriptlet.  This
causes the --tool-help option to correctly list vimdiff, vimdiff2,
gvimdiff, and gvimdiff2 in its output.

Signed-off-by: David Aguilar <redacted>
---
 git-mergetool--lib.sh       | 9 +--------
 mergetools/gvimdiff         | 1 +
 mergetools/gvimdiff2        | 1 +
 mergetools/{vim => vimdiff} | 0
 mergetools/vimdiff2         | 1 +
 5 files changed, 4 insertions(+), 8 deletions(-)
 create mode 120000 mergetools/gvimdiff
 create mode 120000 mergetools/gvimdiff2
 rename mergetools/{vim => vimdiff} (100%)
 create mode 120000 mergetools/vimdiff2

diff --git a/git-mergetool--lib.sh b/git-mergetool--lib.sh
index 4c1e129..db8218a 100644
--- a/git-mergetool--lib.sh
+++ b/git-mergetool--lib.sh

@@ -44,14 +44,7 @@ valid_tool () {
 }
 
 setup_tool () {
-	case "$1" in
-	vim*|gvim*)
-		tool=vim
-		;;
-	*)
-		tool="$1"
-		;;
-	esac
+	tool="$1"
 	mergetools="$(git --exec-path)/mergetools"
 
 	# Load the default definitions

diff --git a/mergetools/gvimdiff b/mergetools/gvimdiff
new file mode 120000
index 0000000..2a72558
--- /dev/null
+++ b/mergetools/gvimdiff

@@ -0,0 +1 @@
+vimdiff

\ No newline at end of file

diff --git a/mergetools/gvimdiff2 b/mergetools/gvimdiff2
new file mode 120000
index 0000000..2a72558
--- /dev/null
+++ b/mergetools/gvimdiff2

@@ -0,0 +1 @@
+vimdiff

\ No newline at end of file

diff --git a/mergetools/vim b/mergetools/vimdiff
similarity index 100%
rename from mergetools/vim
rename to mergetools/vimdiff
diff --git a/mergetools/vimdiff2 b/mergetools/vimdiff2
new file mode 120000
index 0000000..2a72558
--- /dev/null
+++ b/mergetools/vimdiff2

@@ -0,0 +1 @@
+vimdiff

\ No newline at end of file
-- 
1.8.1.1.367.g22b1720.dirty