From e42d401d0f379a6c6ec541eaf05682973abf4bf9 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <LukeShu@sbcglobal.net>
Date: Mon, 18 Mar 2013 10:18:17 -0400
Subject: add a shlib, use .pbs-root and .pbs-package to identify directories

---
 pbs-package-commit | 12 +++-----
 pbs-package-fork   |  4 ++-
 pbs-package-merge  |  9 ++----
 pbs-package-new    |  6 ++--
 pbs-plumb-shlib    | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 97 insertions(+), 18 deletions(-)
 create mode 100644 pbs-plumb-shlib

diff --git a/pbs-package-commit b/pbs-package-commit
index d07d3f9..0f52401 100755
--- a/pbs-package-commit
+++ b/pbs-package-commit
@@ -1,6 +1,6 @@
 #!/bin/bash -euE
 
-. libremessages
+. pbs-plumb-shlib
 
 cmd=${0##*/}
 usage() {
@@ -24,17 +24,13 @@ main() {
 		return 0
 	fi
 
-	if ! git rev-parse --git-dir &>/dev/null; then
-		error "Must be in a package (git) directory"
-		return 1
-	fi
-	cd "$(git rev-parse --show-cdup)"
-
+	ensure_in_pbs-package
 	git commit "$@"
 	git push
 	local msg="$(git log -n1 --pretty=format:%B)"
 	local dir="$(pwd)"
-	cd ..
+
+	cdto_pbs-root
 	git add "${dir##*/}"
 	git commit -m "$msg"
 }
diff --git a/pbs-package-fork b/pbs-package-fork
index 56d0663..97aeec9 100755
--- a/pbs-package-fork
+++ b/pbs-package-fork
@@ -1,6 +1,6 @@
 #!/bin/bash -euE
 
-. libremessages
+. pbs-plumb-shlib
 
 cmd=${0##*/}
 usage() {
@@ -42,6 +42,8 @@ main() {
 	local dest=$3
 	local newpackage="${dest##*/}"
 
+	cdto_pbs-root
+
 	git submodule add -b "packages/${oldpackage}" "${repository}" "${dest}"
 	cd "${dest}"
 	git checkout -b "packages/${newpackage}"
diff --git a/pbs-package-merge b/pbs-package-merge
index f99484b..eca9d1b 100755
--- a/pbs-package-merge
+++ b/pbs-package-merge
@@ -1,6 +1,6 @@
 #!/bin/bash -euE
 
-. libremessages
+. pbs-plumb-shlib
 
 cmd=${0##*/}
 usage() {
@@ -27,12 +27,7 @@ main() {
 		return 1
 	fi
 
-	if ! git rev-parse --git-dir &>/dev/null; then
-		error "Must be in a package (git) directory"
-		return 1
-	fi
-	cd "$(git rev-parse --show-cdup)"
-
+	cdto_pbs-package-root
 	if [[ ! -r pbstrack ]]; then
 		error "No pbstrack file found, don't know where to pull from"
 		return 1
diff --git a/pbs-package-new b/pbs-package-new
index bd76f8a..a99fd30 100755
--- a/pbs-package-new
+++ b/pbs-package-new
@@ -1,6 +1,6 @@
 #!/bin/bash -euE
 
-. libremessages
+. pbs-plumb-shlib
 
 cmd=${0##*/}
 usage() {
@@ -19,7 +19,7 @@ main() {
 		esac
 	done
 	shift $(($OPTIND - 1))
-	if [[ $# > 0 ]]; then
+	if [[ $# != 1 ]]; then
 		usage
 		return 1
 	fi
@@ -27,9 +27,11 @@ main() {
 	local dest=$1
 	local package="${dest##*/}"
 
+	cdto_pbs-root
 	git submodule add ./ "${dest}"
 	cd "${dest}"
 	git checkout --orphan "packages/${package}"
+	touch .pbs-package
 }
 
 main "$@"
diff --git a/pbs-plumb-shlib b/pbs-plumb-shlib
new file mode 100644
index 0000000..c51ddd0
--- /dev/null
+++ b/pbs-plumb-shlib
@@ -0,0 +1,84 @@
+#!/bin/bash
+
+. libremessages
+
+# "Primitive" git functions ##########################################
+
+in_git() {
+	git rev-parse --git-dir &>/dev/null
+}
+
+gitdir() {
+	git rev-parse --git-dir
+}
+
+gitroot() {
+	git rev-parse --show-toplevel
+}
+
+have_file() {
+	local file=$1
+	if in_git; then
+		if [[ -f "$(gitroot)/$file" ]]; then
+			return 0;
+		fi
+	fi
+	return 1
+}
+
+# Deal with being in a PBS package repository ########################
+
+in_pbs-package() {
+	have_file .pbs-package
+}
+
+ensure_in_pbs-package() {
+	if ! in_pbs-package; then
+		error "Not in a PBS package directory"
+		exit 1
+	fi
+}
+
+pbs-package-root() {
+	ensure_in_pbs-package
+	gitroot
+}
+
+cdto_pbs-package-root() {
+	ensure_in_pbs-package
+	cd "$(gitroot)"
+}
+
+# Deal with being in a PBS repository ################################
+
+in_pbs() (
+	if in_pbs-package; then
+		cd "$(pbs-package-root)/.."
+	fi
+	have_file .pbs-root
+)
+
+ensure_in_pbs() {
+	if ! in_pbs; then
+		error "Not in a PBS directory"
+		exit 1
+	fi
+}
+
+pbs-root() {
+	ensure_in_pbs
+	(
+		if in_pbs-package; then
+			cd "$(pbs-package-root)/.."
+		fi
+		gitroot
+	)
+}
+
+cdto_pbs-root() {
+	ensure_in_pbs
+	if in_pbs-package; then
+		cd "$(pbs-package-root)/.."
+	fi
+	cd "$(gitroot)"
+}
-- 
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