update to latest ktlint version and add various improvements #1

Author: antweb

.pre-commit-hooks.yaml

@@ -1,5 +1,5 @@
 -   id: ktlint
-    name: Ktlint formatter for your kotlin code 
+    name: ktlint
     description: Runs ktlint over your kotlin files
     entry: ./run-ktlint.sh
     language: script

README.md

@@ -6,11 +6,22 @@ Usage:
 ```
 repos:
 - repo: https://github.com/maltzj/ktlint-pre-commit
-  sha: e5bee17 
+  rev: master
   hooks:
       - id: ktlint
 ```
 
+If you want to make use of the formatting functionality of ktlint you can configure
+the hook as follows:
+repos:
+- repo: https://github.com/maltzj/ktlint-pre-commit
+  rev: master
+  hooks:
+      - id: ktlint
+        args: [-F]
+```
+
+
 *Notes*: 
 * This file stores ktlint in a `.cache/` directory so that it doesn't need to be re-downloaded each time.  You will probably want to add `.cache/` to the `.gitignore` file of the project which uses this hook.
 * The first time this hook runs it will need to download ktlint, which takes a

run-ktlint.sh

@@ -1,13 +1,16 @@
 #!/usr/bin/env sh
-mkdir -p .cache
-cd .cache
-if [ ! -f ktlint ]
+
+REPOSITORY="https://github.com/pinterest/ktlint"
+VERSION=0.41.0
+CACHE=".cache"
+KTLINT="${CACHE}/ktlint-${VERSION}"
+
+mkdir -p "${CACHE}"
+if [ ! -f "${KTLINT}" ]
 then
-    curl -sSLO https://github.com/shyiko/ktlint/releases/download/0.29.0/ktlint
-    chmod 755 ktlint
+    echo "Installing ${KTLINT}"
+    curl -#SLf "${REPOSITORY}/releases/download/$VERSION/ktlint" > "${KTLINT}"
+    chmod 755 "${KTLINT}"
 fi
-cd ..
 
-changed_kotlin_files=$(git diff --cached --name-only --diff-filter=ACMR | grep ".*kt$" )
-echo $changed_kotlin_files
-.cache/ktlint $changed_kotlin_files
+${KTLINT} $*