tools: Shuffle go code into an idiomatic tree

main packages usually go under a `cmd` directory.
Hoist utility packages to the root `src` directroy so they can be shared.

Change-Id: I0c221f6cd39980f5c202c030cd5134d775533efa
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/50901
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: David Neto <dneto@google.com>

.gitignore

@@ -22,3 +22,4 @@ third_party/llvm-build
 third_party/spirv-headers
 third_party/spirv-tools
 tools/clang
+tools/bin

tools/fix-tests

@@ -15,6 +15,8 @@
 
 # See https://clang.llvm.org/docs/SourceBasedCodeCoverage.html
 
+set -e # Fail on any error.
+
 if [ ! -x "$(which go)" ] ; then
     echo "error: go needs to be on \$PATH to use $0"
     exit 1
@@ -22,9 +24,12 @@ fi
 
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd )"
 ROOT_DIR="$( cd "${SCRIPT_DIR}/.." >/dev/null 2>&1 && pwd )"
+BINARY="${SCRIPT_DIR}/bin/fix-tests"
 
-TARGET_EXE="$(realpath $1)"
+# Rebuild the binary.
+# Note, go caches build artifacts, so this is quick for repeat calls
+pushd "${SCRIPT_DIR}/src/cmd/fix-tests" > /dev/null
+    go build -o "${BINARY}" main.go
+popd > /dev/null
 
-pushd ${SCRIPT_DIR}/src/fix-tests
-go run fix-tests.go "${TARGET_EXE}"
-popd
+"${BINARY}" "$@"

tools/lint

@@ -28,7 +28,7 @@ FILES="`find src -type f` `find samples -type f`"
 
 if command -v go &> /dev/null; then
     # Go is installed. Run cpplint in parallel for speed wins
-    go run $SCRIPT_DIR/src/run-parallel/main.go \
+    go run $SCRIPT_DIR/src/cmd/run-parallel/main.go \
          --only-print-failures                      \
          cpplint.py                                 \
          --root=$ROOT_DIR                           \

tools/src/cmd/fix-tests/main.go

@@ -26,7 +26,7 @@ import (
 	"regexp"
 	"strings"
 
-	"dawn.googlesource.com/tint/tools/src/fix-tests/substr"
+	"dawn.googlesource.com/tint/tools/src/substr"
 )
 
 func main() {

tools/src/cmd/trim-includes/main.go

@@ -35,7 +35,7 @@ import (
 	"sync"
 	"time"
 
-	"dawn.googlesource.com/tint/tools/src/trim-includes/glob"
+	"dawn.googlesource.com/tint/tools/src/glob"
 )
 
 var (

tools/src/glob/glob.go

@@ -23,7 +23,7 @@ import (
 	"os"
 	"path/filepath"
 
-	"dawn.googlesource.com/tint/tools/src/trim-includes/match"
+	"dawn.googlesource.com/tint/tools/src/match"
 )
 
 // Scan walks all files and subdirectories from root, returning those

tools/src/trim-includes/build.sh

@@ -1,11 +0,0 @@
-#!/bin/bash
-
-set -e # Fail on any error.
-
-SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd )"
-ROOT_DIR="$( cd "${SCRIPT_DIR}/../.." >/dev/null 2>&1 && pwd )"
-
-cd $ROOT_DIR
-autoninja -C out/Debug
-cd $ROOT_DIR/build
-ninja

tools/trim-includes

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+# Copyright 2021 The Tint Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e # Fail on any error.
+
+if [ ! -x "$(which go)" ] ; then
+    echo "error: go needs to be on \$PATH to use $0"
+    exit 1
+fi
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd )"
+ROOT_DIR="$( cd "${SCRIPT_DIR}/.." >/dev/null 2>&1 && pwd )"
+BINARY="${SCRIPT_DIR}/bin/trim-includes"
+
+# Rebuild the binary.
+# Note, go caches build artifacts, so this is quick for repeat calls
+pushd "${SCRIPT_DIR}/src/cmd/trim-includes" > /dev/null
+    go build -o "${BINARY}" main.go
+popd > /dev/null
+
+"${BINARY}" "$@"