From 5cad95ba4b2b97de0db7f3125e02ad719851b430 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adrien=20Verg=C3=A9?= <adrienverge@gmail.com>
Date: Wed, 3 Feb 2016 18:32:01 +0100
Subject: [PATCH] Prototype: yaml-fix-indentation

---
 yaml-fix-indentation    | 50 +++++++++++++++++++++++++++++++++++++++++
 yaml-remove-indentation | 37 ++++++++++++++++++++++++++++++
 2 files changed, 87 insertions(+)
 create mode 100755 yaml-fix-indentation
 create mode 100755 yaml-remove-indentation

diff --git a/yaml-fix-indentation b/yaml-fix-indentation
new file mode 100755
index 0000000..dac8b44
--- /dev/null
+++ b/yaml-fix-indentation
@@ -0,0 +1,50 @@
+#!/bin/bash
+
+set -euf
+
+DIR=$(dirname "$(readlink -f $0)")
+
+fix_one_problem_in_file() {
+  local filename=$1
+  local error
+  error=$(yamllint -f parsable "$filename" | grep 'wrong indentation: expected' \
+    | head -n 1)
+  if [ -z "$error" ]; then
+    return 1
+  fi
+  local line=$(echo $error | cut -d: -f2)
+  local expected=$(echo $error | cut -d: -f5 | sed 's/.* expected //;s/ but found.*//')
+  local found=$(echo $error | cut -d: -f5 | sed 's/.*but found //;s/(inde.*//')
+  "$DIR/yaml-remove-indentation" "$filename" $line $expected $found
+  return 0
+}
+
+reformat_yaml() {
+  local in=$1
+  local out=$2
+  python -c 'import sys, yaml; yaml.dump(yaml.load(sys.stdin), sys.stdout)' <"$in" >"$out"
+}
+
+fix_one_file() {
+  local filename=$1
+  local backup=$(mktemp originalXXXXX)
+  cp "$filename" "$backup"
+  echo "FIXING    $file"
+  while fix_one_problem_in_file "$filename"; do continue; done
+  echo "CHECKING  $file"
+  local tmp_old=$(mktemp oldXXXXX)
+  local tmp_new=$(mktemp newXXXXX)
+  reformat_yaml "$backup" "$tmp_old"
+  reformat_yaml "$filename" "$tmp_new"
+  if ! diff -q "$tmp_old" "$tmp_new" &>/dev/null; then
+    echo "error: after reformating, the file contents is detected different."
+    echo "diff $backup $filename"
+    echo "diff $tmp_old $tmp_new"
+    exit 1
+  fi
+  rm "$backup" "$tmp_old" "$tmp_new"
+}
+
+for file in "$@"; do
+  fix_one_file "$file"
+done
diff --git a/yaml-remove-indentation b/yaml-remove-indentation
new file mode 100755
index 0000000..91b0de1
--- /dev/null
+++ b/yaml-remove-indentation
@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+
+import sys
+
+file = sys.argv[1]
+line = int(sys.argv[2]) - 1
+indent_expected = int(sys.argv[3])
+indent_found = int(sys.argv[4])
+
+with open(file) as f:
+    lines = f.readlines()
+
+    before = lines[:line]
+
+    is_a_list = lines[line].strip()[0] == '-'
+
+    i = line
+    while (i < len(lines) and
+           (lines[i].strip() == '' or
+            (not is_a_list and lines[i].startswith(indent_found * ' ')) or
+            (is_a_list and (lines[i].startswith(indent_found * ' ' + '-') or
+                            lines[i].startswith(indent_found * ' ' + ' '))))):
+        i += 1
+
+    contents = lines[line:i]
+    after = lines[i:]
+
+    new_contents = []
+    for line in contents:
+        if line.strip() != '':
+            line = (indent_expected * ' ') + line[indent_found:]
+        new_contents.append(line)
+
+with open(file, 'w') as f:
+    f.write(''.join(before))
+    f.write(''.join(new_contents))
+    f.write(''.join(after))