Adding file_sum_time_logs.rs

examples/file_sum_time_logs.rs

@@ -0,0 +1,54 @@
+use std::fs::File;
+use std::io::{BufRead, BufReader, Lines, Result};
+use std::path::Path;
+use std::process::exit;
+
+/*
+//// Info:
+// Finds and sums the time logs in this format:
+// ---c413: 0.134ms
+
+/// Usage:
+cargo r --example file_sum_time_logs ./files/time_log.txt 4121
+str: 4121
+count: 7 times
+sum: 0.94 ms
+*/
+
+fn read_lines<P>(filename: P) -> Result<Lines<BufReader<File>>>
+where P: AsRef<Path>, {
+    let file = File::open(filename)?;
+    Ok(BufReader::new(file).lines())
+}
+
+fn main() {
+    println!(
+        "Usage: cargo r --example file_sum_time_logs ./files/time_log.txt 4121"
+    );
+    let args: Vec<String> = std::env::args().collect();
+    let file = &args[1];
+    let find_str = &args[2];
+    let mut sum = 0.0;
+    let mut count = 0;
+
+    match read_lines(file) {
+        Ok(lines) => {
+            for line in lines.flatten() {
+                if !line.contains(find_str) { continue; }
+                let v: Vec<&str> = line.split(':').collect(); 
+                let num_str = v[1].trim().trim_end_matches("ms");
+                sum += num_str.parse::<f64>().unwrap_or_else(
+                    |_| { 
+                        panic!("line: {}, num_str: {}", line, num_str)
+                    }
+                );
+                count += 1;
+            }
+        },
+        Err(e) => { println!("err: {}", e); exit(-1) },
+    }
+    println!("str: {}", find_str);
+    println!("count: {} times", count);
+    println!("sum: {:.2} ms", sum);
+}
+

examples/hello.rs

@@ -1,5 +1,7 @@
 // Run: 
 // cargo r --example hello
 fn main() {
+    let args: Vec<String> = std::env::args().collect();
     println!("Hello from an example!");
+    println!("args: {:?}", args);
 }

files/time_log.txt

@@ -0,0 +1,14 @@
+---dataLayer:  {
+  id: '',
+  name: '',
+  startDate: '2021-01-01',
+  endDate: '2029-12-01',
+  base: true,
+  readOnly: false
+}
+---c3: 5.922ms
+---nodes.size:  148
+---c4121: 0.100ms
+---exit calculatePositions
+---c4121: 134ms
+---c4121: 0.40ms

src/file_sum_time_logs.rs

@@ -0,0 +1 @@
+// see examples/file_sum_time_logs.rs

src/lib.rs

@@ -17,6 +17,7 @@ mod drop_aka_dtor;
 mod r#enum;
 mod env_logger;
 mod error_handling;
+mod file_sum_time_logs;
 mod func_ptr;
 mod int_overflow;
 mod interior_mutability;

src/match_.rs

@@ -31,7 +31,7 @@
   let x = match res {
     Some(x) => x,
     None => return,
-  };  
+  };
   println!("--- x {:?}",x);
   let res: Option<i32> = None; // comment to see diff.
   // Match above, can be written: