git-submodule.sh: break overly long command lines

For most of the subcommands of git-submodule(1), we end up passing a
bunch of arguments to the submodule helper. This quickly leads to overly
long lines, where it becomes hard to spot what has changed when one
needs to modify them.

Break up these lines into one argument per line, similarly to how it is
done for the "clone" subcommand already.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-submodule.sh

@@ -129,7 +129,17 @@ cmd_add()
 		usage
 	fi
 
-	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper add ${quiet:+--quiet} ${force:+--force} ${progress:+"--progress"} ${branch:+--branch "$branch"} ${reference_path:+--reference "$reference_path"} ${dissociate:+--dissociate} ${custom_name:+--name "$custom_name"} ${depth:+"$depth"} -- "$@"
+	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper add \
+		${quiet:+--quiet} \
+		${force:+--force} \
+		${progress:+"--progress"} \
+		${branch:+--branch "$branch"} \
+		${reference_path:+--reference "$reference_path"} \
+		${dissociate:+--dissociate} \
+		${custom_name:+--name "$custom_name"} \
+		${depth:+"$depth"} \
+		-- \
+		"$@"
 }
 
 #
@@ -160,7 +170,11 @@ cmd_foreach()
 		shift
 	done
 
-	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper foreach ${quiet:+--quiet} ${recursive:+--recursive} -- "$@"
+	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper foreach \
+		${quiet:+--quiet} \
+		${recursive:+--recursive} \
+		-- \
+		"$@"
 }
 
 #
@@ -191,7 +205,10 @@ cmd_init()
 		shift
 	done
 
-	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper init ${quiet:+--quiet} -- "$@"
+	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper init \
+		${quiet:+--quiet} \
+		-- \
+		"$@"
 }
 
 #
@@ -227,7 +244,12 @@ cmd_deinit()
 		shift
 	done
 
-	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper deinit ${quiet:+--quiet} ${force:+--force} ${deinit_all:+--all} -- "$@"
+	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper deinit \
+		${quiet:+--quiet} \
+		${force:+--force} \
+		${deinit_all:+--all} \
+		-- \
+		"$@"
 }
 
 #
@@ -399,7 +421,12 @@ cmd_set_branch() {
 		shift
 	done
 
-	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper set-branch ${quiet:+--quiet} ${branch:+--branch "$branch"} ${default:+--default} -- "$@"
+	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper set-branch \
+		${quiet:+--quiet} \
+		${branch:+--branch "$branch"} \
+		${default:+--default} \
+		-- \
+		"$@"
 }
 
 #
@@ -428,7 +455,10 @@ cmd_set_url() {
 		shift
 	done
 
-	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper set-url ${quiet:+--quiet} -- "$@"
+	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper set-url \
+		${quiet:+--quiet} \
+		-- \
+		"$@"
 }
 
 #
@@ -480,7 +510,13 @@ cmd_summary() {
 		shift
 	done
 
-	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper summary ${files:+--files} ${cached:+--cached} ${for_status:+--for-status} ${summary_limit:+-n $summary_limit} -- "$@"
+	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper summary \
+		${files:+--files} \
+		${cached:+--cached} \
+		${for_status:+--for-status} \
+		${summary_limit:+-n $summary_limit} \
+		-- \
+		"$@"
 }
 #
 # List all submodules, prefixed with:
@@ -521,8 +557,14 @@ cmd_status()
 		shift
 	done
 
-	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper status ${quiet:+--quiet} ${cached:+--cached} ${recursive:+--recursive} -- "$@"
+	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper status \
+		${quiet:+--quiet} \
+		${cached:+--cached} \
+		${recursive:+--recursive} \
+		-- \
+		"$@"
 }
+
 #
 # Sync remote urls for submodules
 # This makes the value for remote.$remote.url match the value
@@ -554,7 +596,11 @@ cmd_sync()
 		esac
 	done
 
-	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper sync ${quiet:+--quiet} ${recursive:+--recursive} -- "$@"
+	git ${wt_prefix:+-C "$wt_prefix"} submodule--helper sync \
+		${quiet:+--quiet} \
+		${recursive:+--recursive} \
+		-- \
+		"$@"
 }
 
 cmd_absorbgitdirs()