1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145

use anyhow::{anyhow, Context, Result};
use std::fs;

#[cfg(test)]
mod tests {
    use super::yaml_strings;

    trait NormalizeJson {
        fn normalize_json(&self) -> String;
    }

    impl NormalizeJson for serde_json::Value {
        fn normalize_json(&self) -> String {
            return serde_json::to_string_pretty(&self).expect("failed to pretty print string");
        }
    }

    impl NormalizeJson for String {
        fn normalize_json(&self) -> String {
            let s: serde_json::Value = serde_json::from_str(self).expect("invalid json");
            return s.normalize_json();
        }
    }

    impl NormalizeJson for &str {
        fn normalize_json(&self) -> String {
            return self.to_string().normalize_json();
        }
    }

    #[test]
    fn yaml_merges_arrays() {
        let yaml_a = r#"
          list:
            - a
        "#;

        let yaml_b = r#"
          list:
            - b
        "#;
        let result = yaml_strings(&vec![yaml_a.to_string(), yaml_b.to_string()]).unwrap();

        let expected = r#"{
          "list": [
            "a",
            "b"
          ]
        }"#;
        assert_eq!(expected.normalize_json(), result.normalize_json());
    }

    #[test]
    fn yaml_merges_dictionaries() {
        let yaml_a = r#"
          dict:
            a: true
        "#;

        let yaml_b = r#"
          dict:
            b: true
        "#;

        let result = yaml_strings(&vec![yaml_a.to_string(), yaml_b.to_string()])
            .unwrap()
            .to_string();
        let expected = r#"{
            "dict": {
                "a": true,
                "b": true
            }
        }"#;
        assert_eq!(expected.normalize_json(), result.normalize_json());
    }

    #[test]
    fn yaml_merges_deeply() {
        let yaml_a = r#"
          dict:
            list:
                - a
        "#;

        let yaml_b = r#"
          dict:
            list:
            - b 
        "#;

        let result = yaml_strings(&vec![yaml_a.to_string(), yaml_b.to_string()])
            .unwrap()
            .to_string();

        let expected = r#"{
            "dict": {
                "list": [
                    "a",
                    "b"
                ]
            }
        }"#;
        assert_eq!(expected.normalize_json(), result.normalize_json());
    }
}

pub fn yaml_strings(inputs: &Vec<String>) -> Result<serde_json::Value> {
    let mut result: serde_json::Value = serde_json::from_str("{}")?;

    for i in inputs {
        let i: serde_json::Value =
            serde_yaml::from_str(&i).with_context(|| format!("Failed to parse file {}", i))?;
        result = merge_struct::merge(&result, &i)?;
    }

    return Ok(result);
}

pub fn yaml_files(
    inputs: &Vec<String>,
    output: &str,
    transformer: fn(serde_json::Value) -> Result<serde_json::Value>,
) -> Result<()> {
    eprintln!("Will read from:");
    for i in inputs {
        eprintln!("- {}", i);
    }
    eprintln!("And write to: {}", output);

    let mut input_contents = Vec::new();

    for i in inputs {
        let contents =
            fs::read_to_string(i).with_context(|| format!("Failed to read file {}", i))?;
        input_contents.push(contents);
    }

    let result = yaml_strings(inputs).with_context(|| format!("Failed to merge yaml"))?;
    let result = transformer(result)?;
    let result = serde_json::to_string_pretty(&result)
        .with_context(|| format!("Failed to convert to json"))?;
    fs::write(output, result).with_context(|| format!("Failed to write to {}", output))?;

    return Ok(());
}