oxyroot 0.1.25

Another attempt to make library reading and writing of `.root` binary files which are commonly used in particle physics
Documentation 
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

use anyhow::Result;
use log::{trace, warn};
use std::path::PathBuf;
use std::process::{Command, ExitStatus};
use std::{fs, path};

pub struct TemplateWriter {
    out_dir: path::PathBuf,
    out_root_path: String,
    value_type: String,
    compression: i32,
}

impl Default for TemplateWriter {
    fn default() -> Self {
        TemplateWriter {
            out_dir: "/tmp/rust_test".into(),
            out_root_path: "o.root".into(),
            value_type: "int".into(),
            compression: 207,
        }
    }
}

impl TemplateWriter {
    fn final_file_path(&self) -> PathBuf {
        let mut o = self.out_dir.clone();
        o.push("o.root");
        o
    }

    pub fn with_outdir<T: AsRef<str>>(mut self, outdir: T) -> Result<TemplateWriter> {
        let s = outdir.as_ref().to_string();
        fs::create_dir_all(&s)?;
        self.out_dir = s.into();
        trace!("outdir = {:?}", self.out_dir);
        Ok(self)
    }

    pub fn with_value_type<T: AsRef<str>>(mut self, value_t: T) -> Result<TemplateWriter> {
        let value_t = value_t.as_ref().to_string();
        self.value_type = value_t;
        trace!("value_type = {:?}", self.value_type);
        Ok(self)
    }

    pub fn with_compression(mut self, value_t: i32) -> Result<TemplateWriter> {
        let value_t = value_t;
        self.compression = value_t;
        trace!("compression = {:?}", self.compression);
        Ok(self)
    }

    pub fn write_root_macro(&self) -> Result<()> {
        trace!("outdir = {:?}", self.out_dir.clone());
        let mut macro_path = self.out_dir.clone();
        macro_path.push("gen.C");
        println!("write to {:?}", macro_path);

        let macro_content = format!(
            r#"{{
   {TYPE}  v_i = 0;

   TFile *hfile = hfile = TFile::Open("o.root","RECREATE", "", {COMPRESSION});

   TTree *tree = new TTree("T","data for rust tests");
   tree->Branch("v_i",&v_i);
   
   for (int i = -10; i < 10; ++i)
     {{
       v_i = i;
       tree->Fill(); 
     }}   

   tree->Print();
   tree->Write();   
   delete hfile;
}}
"#,
            TYPE = self.value_type,
            COMPRESSION = self.compression
        );

        fs::write(macro_path, macro_content)?;

        Ok(())
    }

    pub fn write_raw_macro(&self, m: &str) -> Result<()> {
        trace!("outdir = {:?}", self.out_dir.clone());
        let mut macro_path = self.out_dir.clone();
        macro_path.push("gen.C");
        println!("write macro to {:?}", macro_path);
        fs::write(macro_path, m)?;
        Ok(())
    }

    pub fn execute_macro(&self) -> Result<()> {
        trace!("Execute ROOT");
        let out = Command::new("root")
            .arg("-q")
            .arg("gen.C")
            .current_dir(&self.out_dir)
            .output()?;

        if !out.status.success() {
            eprintln!("stdout: {}", String::from_utf8(out.stdout)?);
            eprintln!("stderr: {}", String::from_utf8(out.stderr)?);
        } else {
            trace!("{}", String::from_utf8(out.stdout)?);
        }

        assert!(out.status.success());

        Ok(())
    }

    pub fn tree(&self) -> Result<oxyroot::ReaderTree> {
        let mut f = oxyroot::RootFile::open(self.final_file_path().to_str().unwrap())?;
        let tree = f.get_tree("T")?;
        Ok(tree)
    }
}

impl Drop for TemplateWriter {
    fn drop(&mut self) {
        trace!("Delete {}", self.out_dir.to_str().unwrap());
        // fs::remove_dir_all(&self.out_dir).expect("TODO: panic message");
    }
}