From afeeb5bb458042c353573c2b2f464d35123e5aad Mon Sep 17 00:00:00 2001
From: John Hawthorn <john.hawthorn@gmail.com>
Date: Sat, 12 Jul 2014 15:07:22 -0700
Subject: Add tests and split matching into match.c

---
 .gitignore  |  1 +
 Makefile    | 17 +++++++++++------
 fzy.c       | 11 ++---------
 match.c     | 12 ++++++++++++
 test.rb     | 41 +++++++++++++++++++++++++++++++++++++++++
 testscore.c | 20 ++++++++++++++++++++
 6 files changed, 87 insertions(+), 15 deletions(-)
 create mode 100644 match.c
 create mode 100644 test.rb
 create mode 100644 testscore.c

diff --git a/.gitignore b/.gitignore
index 5bae2fa..f54609d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 fzy
+testscore
 *.o
diff --git a/Makefile b/Makefile
index 7944bcb..974332c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,15 @@
-LIBS=
 CFLAGS+=-Wall -Wextra -g
-TARGET=fzy
-OBJECTS=fzy.o
 
-$(TARGET): $(OBJECTS)
-	$(CC) $(CCFLAGS) -o $@ $^ $(LIBS)
+all: fzy testscore
+
+testscore: testscore.o match.o
+	$(CC) $(CCFLAGS) -o $@ $^
+
+test: testscore
+	ruby test.rb
+
+fzy: fzy.o match.o
+	$(CC) $(CCFLAGS) -o $@ $^
 
 clean:
-	$(RM) $(TARGET) *.o
+	$(RM) fzy testscore *.o
diff --git a/fzy.c b/fzy.c
index fc6dd3d..06a3717 100644
--- a/fzy.c
+++ b/fzy.c
@@ -7,15 +7,8 @@
 #include <fcntl.h>
 #include <ctype.h>
 
-double match(const char *needle, const char *haystack){
-	while(*needle){
-		if(!*haystack)
-			return 0.0;
-		while(tolower(*needle) == tolower(*haystack++))
-			needle++;
-	}
-	return 1.0;
-}
+/* from match.c */
+double match(const char *needle, const char *haystack);
 
 #define INITIAL_CAPACITY 1
 int choices_capacity = 0;
diff --git a/match.c b/match.c
new file mode 100644
index 0000000..dc79660
--- /dev/null
+++ b/match.c
@@ -0,0 +1,12 @@
+#include <ctype.h>
+
+double match(const char *needle, const char *haystack){
+	while(*needle){
+		if(!*haystack)
+			return 0.0;
+		while(*haystack && tolower(*needle) == tolower(*haystack++)){
+			needle++;
+		}
+	}
+	return 1.0;
+}
diff --git a/test.rb b/test.rb
new file mode 100644
index 0000000..6b92faf
--- /dev/null
+++ b/test.rb
@@ -0,0 +1,41 @@
+require "minitest/autorun"
+
+# Largely borrowed from selecta
+describe "score" do
+  def score(candidate, query)
+    # FIXME: should escape this properly
+    `./testscore '#{query}' '#{candidate}'`.to_f
+  end
+
+  it "scores 1 when the query is empty" do
+    assert_equal 1, score("a", "")
+  end
+
+  it "scores 0 when the choice is empty" do
+    assert_equal 0, score("", "a")
+  end
+
+  it "scores 1 when exact match" do
+    assert_equal 1, score("a", "a")
+  end
+
+  it "scores 0 when the query is longer than the choice" do
+    assert_equal 0, score("short", "longer")
+  end
+
+  it "scores 0 when the query doesn't match at all" do
+    assert_equal 0, score("a", "b")
+  end
+
+  it "scores 0 when only a prefix of the query matches" do
+    assert_equal 0, score("ab", "ac")
+  end
+
+  it "scores greater than 0 when it matches" do
+    assert_operator 0, :<, score("a", "a")
+    assert_operator 0, :<, score("ab", "a")
+    assert_operator 0, :<, score("ba", "a")
+    assert_operator 0, :<, score("bab", "a")
+    assert_operator 0, :<, score("babababab", "aaaa")
+  end
+end
diff --git a/testscore.c b/testscore.c
new file mode 100644
index 0000000..6ce3aea
--- /dev/null
+++ b/testscore.c
@@ -0,0 +1,20 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+/* from match.c */
+double match(const char *needle, const char *haystack);
+
+void usage(const char *argv0){
+	fprintf(stderr, "USAGE: %s QUERY CANDIDATE\n", argv0);
+}
+
+int main(int argc, char *argv[]){
+	if(argc != 3){
+		usage(argv[0]);
+	}
+
+	double result = match(argv[1], argv[2]);
+	printf("%f\n", result);
+
+	return 0;
+}
-- 
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