Add a tool to generate a full coverage report from the test suite.

1 files changed, 65 insertions, 0 deletions

diff --git a/gocovcat.go b/gocovcat.go
new file mode 100755
index 0000000..97ece6f
--- /dev/null
+++ b/gocovcat.go
@@ -0,0 +1,65 @@
+//usr/bin/env go run "$0" "$@"; exit $?
+
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+func handleErr(err error) {
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%v\n", err)
+		os.Exit(1)
+	}
+}
+
+func main() {
+	var mode string
+	blocks := map[string]int{}
+	for _, filename := range os.Args[1:] {
+		file, err := os.Open(filename)
+		handleErr(err)
+		buf := bufio.NewReader(file)
+		err = nil
+		for err != io.EOF {
+			var line string
+			line, err = buf.ReadString('\n')
+			if err == io.EOF {
+				continue
+			}
+			handleErr(err)
+			line = strings.TrimSuffix(line, "\n")
+
+			if strings.HasPrefix(line, "mode:") {
+				if mode == "" {
+					mode = line
+				} else if mode != line {
+					fmt.Fprintf(os.Stderr, "mixed modes: %q != %q\n", mode, line)
+					os.Exit(1)
+				}
+			} else {
+				sp := strings.LastIndexByte(line, ' ')
+				block := line[:sp]
+				cntStr := line[sp+1:]
+				cnt, err := strconv.Atoi(cntStr)
+				handleErr(err)
+				blocks[block] += cnt
+			}
+		}
+	}
+	keys := make([]string, 0, len(blocks))
+	for key := range blocks {
+		keys = append(keys, key)
+	}
+	sort.Strings(keys)
+	fmt.Println(mode)
+	for _, block := range keys {
+		fmt.Printf("%s %d\n", block, blocks[block])
+	}
+}