git-gui: extract script to generate macOS app

Extract script to generate the macOS app. This change allows us to reuse
the build logic with the Meson build system.

Note that as part of this change we also modify the TKEXECUTABLE
variable to track its full path. Like this we don't have to propagate
both the TKEXECUTABLE and TKFRAMEWORK variables into the script, and the
basename can be trivially computed from TKEXECUTABLE anyway.

Signed-off-by: Patrick Steinhardt <ps@pks.im>

3 files changed, 34 insertions, 20 deletions

diff --git a/Makefile b/Makefile
index 722df4ae3f..cde1b7e607 100644
--- a/Makefile
+++ b/Makefile
@@ -112,7 +112,7 @@ ifeq ($(uname_S),Darwin)
 			TKFRAMEWORK = /System/Library/Frameworks/Tk.framework/Resources/Wish\ Shell.app
                 endif
         endif
-	TKEXECUTABLE = $(shell basename "$(TKFRAMEWORK)" .app)
+	TKEXECUTABLE = $(TKFRAMEWORK)/Contents/MacOS/$(shell basename "$(TKFRAMEWORK)" .app)
 	TKEXECUTABLE_SQ = $(subst ','\'',$(TKEXECUTABLE))
 endif
 
@@ -130,7 +130,6 @@ TCLTK_PATH_SQ = $(subst ','\'',$(TCLTK_PATH))
 
 gg_libdir ?= $(sharedir)/git-gui/lib
 libdir_SQ  = $(subst ','\'',$(gg_libdir))
-libdir_SED = $(subst ','\'',$(subst \,\\,$(gg_libdir_sed_in)))
 exedir     = $(dir $(gitexecdir))share/git-gui/lib
 
 GITGUI_RELATIVE :=
@@ -139,7 +138,6 @@ GITGUI_MACOSXAPP :=
 ifeq ($(exedir),$(gg_libdir))
 	GITGUI_RELATIVE := 1
 endif
-gg_libdir_sed_in := $(gg_libdir)
 ifeq ($(uname_S),Darwin)
         ifeq ($(shell test -d $(TKFRAMEWORK) && echo y),y)
 		GITGUI_MACOSXAPP := YesPlease
@@ -163,22 +161,8 @@ Git\ Gui.app: GIT-VERSION-FILE GIT-GUI-BUILD-OPTIONS \
 		macosx/Info.plist \
 		macosx/git-gui.icns \
 		macosx/AppMain.tcl \
-		$(TKFRAMEWORK)/Contents/MacOS/$(TKEXECUTABLE)
-	$(QUIET_GEN)rm -rf '$@' '$@'+ && \
-	mkdir -p '$@'+/Contents/MacOS && \
-	mkdir -p '$@'+/Contents/Resources/Scripts && \
-	cp '$(subst ','\'',$(subst \,,$(TKFRAMEWORK)/Contents/MacOS/$(TKEXECUTABLE)))' \
-		'$@'+/Contents/MacOS && \
-	cp macosx/git-gui.icns '$@'+/Contents/Resources && \
-	sed -e 's/@@GITGUI_VERSION@@/$(GITGUI_VERSION)/g' \
-		-e 's/@@GITGUI_TKEXECUTABLE@@/$(TKEXECUTABLE)/g' \
-		macosx/Info.plist \
-		>'$@'+/Contents/Info.plist && \
-	sed -e 's|@@gitexecdir@@|$(gitexecdir_SQ)|' \
-		-e 's|@@GITGUI_LIBDIR@@|$(libdir_SED)|' \
-		macosx/AppMain.tcl \
-		>'$@'+/Contents/Resources/Scripts/AppMain.tcl && \
-	mv '$@'+ '$@'
+		$(TKEXECUTABLE)
+	$(QUIET_GEN)$(SHELL_PATH) generate-macos-app.sh . "$@" ./GIT-GUI-BUILD-OPTIONS ./GIT-VERSION-FILE
 endif
 
 ifdef GITGUI_WINDOWS_WRAPPER
diff --git a/generate-macos-app.sh b/generate-macos-app.sh
new file mode 100755
index 0000000000..71b9fa67a4
--- /dev/null
+++ b/generate-macos-app.sh
@@ -0,0 +1,30 @@
+#!/bin/sh
+
+set -e
+
+SOURCE_DIR="$1"
+OUTPUT="$2"
+BUILD_OPTIONS="$3"
+VERSION_FILE="$4"
+
+. "$BUILD_OPTIONS"
+. "$VERSION_FILE"
+
+rm -rf "$OUTPUT" "$OUTPUT+"
+
+mkdir -p "$OUTPUT+/Contents/MacOS"
+mkdir -p "$OUTPUT+/Contents/Resources/Scripts"
+
+cp "$TKEXECUTABLE" "$OUTPUT+/Contents/MacOS"
+cp "$SOURCE_DIR/macosx/git-gui.icns" "$OUTPUT+/Contents/Resources"
+sed \
+	-e "s/@@GITGUI_VERSION@@/$GITGUI_VERSION/g" \
+	-e "s/@@GITGUI_TKEXECUTABLE@@/$(basename "$TKEXECUTABLE")/g" \
+	"$SOURCE_DIR/macosx/Info.plist" \
+	>"$OUTPUT+/Contents/Info.plist"
+sed \
+	-e "s|@@gitexecdir@@|$GITGUI_GITEXECDIR|" \
+	-e "s|@@GITGUI_LIBDIR@@|$GITGUI_LIBDIR|" \
+	"$SOURCE_DIR/macosx/AppMain.tcl" \
+	>"$OUTPUT+/Contents/Resources/Scripts/AppMain.tcl"
+mv "$OUTPUT+" "$OUTPUT"
diff --git a/generate-macos-wrapper.sh b/generate-macos-wrapper.sh
index da7e4782f7..0304937f41 100755
--- a/generate-macos-wrapper.sh
+++ b/generate-macos-wrapper.sh
@@ -26,7 +26,7 @@ rm -f "$OUTPUT" "$OUTPUT+"
 		echo "git-gui version $GITGUI_VERSION"
 	else
 		libdir="${GIT_GUI_LIB_DIR:-$GITGUI_LIBDIR}"
-		exec "$libdir/Git Gui.app/Contents/MacOS/$TKEXECUTABLE" "$0" "$@"
+		exec "$libdir/Git Gui.app/Contents/MacOS/$(basename "$TKEXECUTABLE")" "$0" "$@"
 	fi
 	EOF
 ) >"$OUTPUT+"