Use standard library JSON parser for JSON files

This patch reverts the changes to the README made in
57265f78b4 and makes it so that Dotbot
supports JSON files with tab characters.

README.md

@@ -118,13 +118,9 @@ Configuration
 -------------
 
 Dotbot uses YAML or JSON formatted configuration files to let you specify how
-to set up your dotfiles. The YAML format is recommended because it looks
-cleaner. JSON will be parsed as a subset of YAML, so tab characters are not
-permitted.
-
-Currently, Dotbot knows how to [link](#link) files and folders, execute
-[shell](#shell) commands, and [clean](#clean) directories of broken symbolic
-links.
+to set up your dotfiles. Currently, Dotbot knows how to [link](#link) files and
+folders, execute [shell](#shell) commands, and [clean](#clean) directories of
+broken symbolic links.
 
 **Ideally, bootstrap configurations should be idempotent. That is, the
 installer should be able to be run multiple times without causing any

dotbot/config.py

@@ -1,4 +1,5 @@
 import yaml
+import json
 from .util import string
 
 class ConfigReader(object):
@@ -8,7 +9,16 @@ class ConfigReader(object):
     def _read(self, config_file_path):
         try:
             with open(config_file_path) as fin:
-                data = yaml.safe_load(fin)
+                try:
+                    data = yaml.safe_load(fin)
+                except Exception as e:
+                    # try falling back to JSON, but return original exception
+                    # if that fails too
+                    try:
+                        fin.seek(0)
+                        data = json.load(fin)
+                    except Exception:
+                        raise e
             return data
         except Exception as e:
             msg = string.indent_lines(str(e))

test/test-lib.bash

@@ -1,6 +1,7 @@
 DEBUG=false
 DOTFILES='/home/vagrant/dotfiles'
 INSTALL_CONF='install.conf.yaml'
+INSTALL_CONF_JSON='install.conf.json'
 
 test_run_() {
     if ! ${DEBUG}; then
@@ -48,4 +49,12 @@ run_dotbot() {
     )
 }
 
+run_dotbot_json() {
+    (
+        cd "${DOTFILES}"
+        cat > "${INSTALL_CONF_JSON}"
+        /dotbot/bin/dotbot -d . -c "${INSTALL_CONF_JSON}" "${@}"
+    )
+}
+
 initialize

test/tests/config-json-tabs.bash

@@ -0,0 +1,20 @@
+test_description='json config with tabs allowed'
+. '../test-lib.bash'
+
+test_expect_success 'setup' '
+echo "grape" > ${DOTFILES}/h
+'
+
+test_expect_success 'run' '
+run_dotbot_json <<EOF
+[{
+	"link": {
+		"~/.i": "h"
+	}
+}]
+EOF
+'
+
+test_expect_success 'test' '
+grep "grape" ~/.i
+'

test/tests/config-json.bash

@@ -0,0 +1,20 @@
+test_description='json config allowed'
+. '../test-lib.bash'
+
+test_expect_success 'setup' '
+echo "grape" > ${DOTFILES}/h
+'
+
+test_expect_success 'run' '
+run_dotbot_json <<EOF
+[{
+    "link": {
+        "~/.i": "h"
+    }
+}]
+EOF
+'
+
+test_expect_success 'test' '
+grep "grape" ~/.i
+'