Remove the exceptions for "vim" and "defaults" in the mergetool library
so that every filename in mergetools/ matches 1:1 with the name of a
valid built-in tool.

Make common functions available in $MERGE_TOOLS_DIR/include/.

Signed-off-by: David Aguilar <dav...@gmail.com>
---
This diffstat is much nicer now thanks to John's setup_tool rework in 1/1.

 Makefile                                     |  6 +++-
 git-mergetool--lib.sh                        | 41 ++++++++--------------------
 mergetools/gvimdiff                          |  1 +
 mergetools/gvimdiff2                         |  1 +
 mergetools/{defaults => include/defaults.sh} |  0
 mergetools/{vim => vimdiff}                  |  0
 mergetools/vimdiff2                          |  1 +
 7 files changed, 19 insertions(+), 31 deletions(-)
 create mode 100644 mergetools/gvimdiff
 create mode 100644 mergetools/gvimdiff2
 rename mergetools/{defaults => include/defaults.sh} (100%)
 rename mergetools/{vim => vimdiff} (100%)
 create mode 100644 mergetools/vimdiff2

diff --git a/Makefile b/Makefile
index f69979e..0f89032 100644
--- a/Makefile
+++ b/Makefile
@@ -2724,7 +2724,11 @@ install: all
        $(INSTALL) $(install_bindir_programs) '$(DESTDIR_SQ)$(bindir_SQ)'
        $(MAKE) -C templates DESTDIR='$(DESTDIR_SQ)' install
        $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(mergetools_instdir_SQ)'
-       $(INSTALL) -m 644 mergetools/* '$(DESTDIR_SQ)$(mergetools_instdir_SQ)'
+       $(INSTALL) -m 644 $(filter-out include,$(wildcard mergetools/*)) \
+               '$(DESTDIR_SQ)$(mergetools_instdir_SQ)'
+       $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(mergetools_instdir_SQ)/include'
+       $(INSTALL) -m 644 mergetools/include/* \
+               '$(DESTDIR_SQ)$(mergetools_instdir_SQ)/include'
 ifndef NO_GETTEXT
        $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(localedir_SQ)'
        (cd po/build/locale && $(TAR) cf - .) | \
diff --git a/git-mergetool--lib.sh b/git-mergetool--lib.sh
index f1bb372..7ea7510 100644
--- a/git-mergetool--lib.sh
+++ b/git-mergetool--lib.sh
@@ -1,5 +1,7 @@
 #!/bin/sh
 # git-mergetool--lib is a library for common merge tool functions
+MERGE_TOOLS_DIR=$(git --exec-path)/mergetools
+
 diff_mode() {
        test "$TOOL_MODE" = diff
 }
@@ -44,19 +46,9 @@ valid_tool () {
 }
 
 setup_tool () {
-       case "$1" in
-       vim*|gvim*)
-               tool=vim
-               ;;
-       *)
-               tool="$1"
-               ;;
-       esac
-       mergetools="$(git --exec-path)/mergetools"
+       tool="$1"
 
-       # Load the default definitions
-       . "$mergetools/defaults"
-       if ! test -f "$mergetools/$tool"
+       if ! test -f "$MERGE_TOOLS_DIR/$tool"
        then
                # Use a special return code for this case since we want to
                # source "defaults" even when an explicit tool path is
@@ -65,8 +57,11 @@ setup_tool () {
                return 2
        fi
 
+       # Load the default functions
+       . "$MERGE_TOOLS_DIR/include/defaults.sh"
+
        # Load the redefined functions
-       . "$mergetools/$tool"
+       . "$MERGE_TOOLS_DIR/$tool"
 
        if merge_mode && ! can_merge
        then
@@ -194,24 +189,10 @@ list_merge_tool_candidates () {
 show_tool_help () {
        unavailable= available= LF='
 '
-
-       scriptlets="$(git --exec-path)"/mergetools
-       for i in "$scriptlets"/*
+       for i in "$MERGE_TOOLS_DIR"/*
        do
-               . "$scriptlets"/defaults
-               . "$i"
-
-               tool="$(basename "$i")"
-               if test "$tool" = "defaults"
-               then
-                       continue
-               elif merge_mode && ! can_merge
-               then
-                       continue
-               elif diff_mode && ! can_diff
-               then
-                       continue
-               fi
+               tool=$(basename "$i")
+               setup_tool "$tool" 2>/dev/null || continue
 
                merge_tool_path=$(translate_merge_tool_path "$tool")
                if type "$merge_tool_path" >/dev/null 2>&1
diff --git a/mergetools/gvimdiff b/mergetools/gvimdiff
new file mode 100644
index 0000000..04a5bb0
--- /dev/null
+++ b/mergetools/gvimdiff
@@ -0,0 +1 @@
+. "$MERGE_TOOLS_DIR/vimdiff"
diff --git a/mergetools/gvimdiff2 b/mergetools/gvimdiff2
new file mode 100644
index 0000000..04a5bb0
--- /dev/null
+++ b/mergetools/gvimdiff2
@@ -0,0 +1 @@
+. "$MERGE_TOOLS_DIR/vimdiff"
diff --git a/mergetools/defaults b/mergetools/include/defaults.sh
similarity index 100%
rename from mergetools/defaults
rename to mergetools/include/defaults.sh
diff --git a/mergetools/vim b/mergetools/vimdiff
similarity index 100%
rename from mergetools/vim
rename to mergetools/vimdiff
diff --git a/mergetools/vimdiff2 b/mergetools/vimdiff2
new file mode 100644
index 0000000..04a5bb0
--- /dev/null
+++ b/mergetools/vimdiff2
@@ -0,0 +1 @@
+. "$MERGE_TOOLS_DIR/vimdiff"
-- 
1.8.0.8.g9bc9422

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