Initial commit: add the grep like from chapter 2

diff --git a/.gitignore b/.gitignore
new file mode 100644 (file)
index 0000000..a76ebad
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+target/\r
+.vscode/\r
+**/*.rs.bk
\ No newline at end of file

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new file mode 100644 (file)
index 0000000..3a88348
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+++ b/ch2-str-simple-pattern/Cargo.lock
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diff --git a/ch2-str-simple-pattern/Cargo.toml b/ch2-str-simple-pattern/Cargo.toml
new file mode 100644 (file)
index 0000000..0ecbd52
--- /dev/null
+++ b/ch2-str-simple-pattern/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "ch2-str-simple-pattern"
+version = "0.1.0"
+authors = ["Greg Burri <greg.burri@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+regex = "1"
+clap = "2"
\ No newline at end of file

diff --git a/ch2-str-simple-pattern/src/main.rs b/ch2-str-simple-pattern/src/main.rs
new file mode 100644 (file)
index 0000000..b09af0a
--- /dev/null
+++ b/ch2-str-simple-pattern/src/main.rs
@@ -0,0 +1,60 @@
+/*
+ * Goals:
+ * - Parse command line arguments.
+ * - Read a file line by line.
+ * - Read stdin
+ * - Use regexp to match a line.
+ */
+
+use std::{ fs::File, io::{ self, BufReader, prelude::* } };
+use regex::Regex;
+use clap::{ App, Arg };
+
+fn main() {
+    let args = App::new("grep-lite")
+        .version("0.1")
+        .about("searches for patterns")
+        .arg(Arg::with_name("pattern")
+            .help("The pattern to search for")
+            .takes_value(true)
+            .required(true)
+        )
+        .arg(Arg::with_name("file")
+            .help("File to search into. Read from stding if not given")
+            .takes_value(true)
+            .required(false)
+        )
+        .get_matches();
+
+    let pattern = args.value_of("pattern").unwrap();
+    let pattern_re = Regex::new(pattern).unwrap();
+
+    match args.value_of("file") {
+        Some(filename) => {
+            let file = File::open(filename).unwrap();
+            let reader = BufReader::new(file);
+            process_lines(reader, pattern_re);
+        },
+        None => {
+            let stdin = io::stdin();
+            let reader = stdin.lock();
+            process_lines(reader, pattern_re);
+        }
+    }
+}
+
+fn process_lines<T: BufRead + Sized>(reader: T, pattern_re: Regex) {
+    for (i, line_result) in reader.lines().enumerate() {
+        match line_result {
+            Ok(line) => {
+                let contains_substring = pattern_re.find(&line);
+                match contains_substring {
+                    Some(_) => println!("Found \"{}\" at line number {}", pattern_re, i + 1),
+                    None => (),
+                }
+            },
+            Err(err) =>
+                eprintln!("Can't read line: {}", err)
+        }
+    }
+}

diff --git a/ch2-str-simple-pattern/text.txt b/ch2-str-simple-pattern/text.txt
new file mode 100644 (file)
index 0000000..48bd08c
--- /dev/null
+++ b/ch2-str-simple-pattern/text.txt
@@ -0,0 +1,4 @@
+Every face, every shop, bedroom window, public-house, and\r
+dark square is a picture feverishly turned--in search of what?\r
+It is the same with books.\r
+What do we seek through millions of pages?
\ No newline at end of file