Re: [GUILT 17/28] "guilt graph" no longer loops when no patches are applied.

Give an error message if no patches are applied.  Added a test case
that never terminates unless this fix is applied.

Signed-off-by: Per Cederqvist <redacted>
---
 guilt-graph          | 10 ++++++++--
 regression/t-033.out |  3 +++
 regression/t-033.sh  | 11 +++++++++++
 3 files changed, 22 insertions(+), 2 deletions(-)
 create mode 100644 regression/t-033.out
 create mode 100755 regression/t-033.sh

diff --git a/guilt-graph b/guilt-graph
index b3469dc..00301d5 100755
--- a/guilt-graph
+++ b/guilt-graph

@@ -17,8 +17,14 @@ fi
 
 patchname="$1"
 
-bottom=`git rev-parse refs/patches/$branch/$(head_n 1 < "$applied")`
-base=`git rev-parse $bottom^`
+bottompatch=$(head_n 1 < "$applied")
+if [ -z "$bottompatch" ]
+then
+	echo "No patch applied." >&2
+	exit 1
+fi
+
+base=`git rev-parse "refs/patches/${branch}/${bottompatch}^"`
 
 if [ -z "$patchname" ]; then
 	top=`git rev-parse HEAD`

diff --git a/regression/t-033.out b/regression/t-033.out
new file mode 100644
index 0000000..76613f9
--- /dev/null
+++ b/regression/t-033.out

@@ -0,0 +1,3 @@
+% setup_repo
+% guilt graph
+No patch applied.

diff --git a/regression/t-033.sh b/regression/t-033.sh
new file mode 100755
index 0000000..ae40577
--- /dev/null
+++ b/regression/t-033.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+#
+# Test the graph code
+#
+
+source "$REG_DIR/scaffold"
+
+cmd setup_repo
+
+shouldfail guilt graph
+

-- 
1.8.3.1