Added lifetimes; split code into library for minigrep.

54 files changed, 101 insertions, 29 deletions

diff --git a/lifetimes/Cargo.lock b/lifetimes/Cargo.lock
new file mode 100644
index 0000000..0c2507e
--- /dev/null
+++ b/lifetimes/Cargo.lock
@@ -0,0 +1,4 @@
+[[package]]
+name = "lifetimes"
+version = "0.1.0"
+
diff --git a/lifetimes/Cargo.toml b/lifetimes/Cargo.toml
new file mode 100644
index 0000000..8003864
--- /dev/null
+++ b/lifetimes/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "lifetimes"
+version = "0.1.0"
+authors = ["53hornet <53hornet@gmail.com>"]
+edition = "2018"
+
+[dependencies]
diff --git a/lifetimes/src/main.rs b/lifetimes/src/main.rs
new file mode 100644
index 0000000..87b6ce6
--- /dev/null
+++ b/lifetimes/src/main.rs
@@ -0,0 +1,43 @@
+fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
+    // what this is doing is basically tagging x and y and the
+    // result with the same 'a, telling rust not to let any
+    // of them expire before the others; that way nothing
+    // will go out of scope prematurely and the result will
+    // always have a non-null reference
+
+    // basically, 'a gives all three values the same lifetime.
+    // so long as they're all alive at the same time, there are
+    // no reference errors
+    
+    // note that the lifetime selected for the result is 
+    // equal to the smaller of the lifetimes of the 
+    // parameters
+
+    if x.len() > y.len() {
+        x
+    }
+    else {
+        y
+    }
+}
+
+struct ImportantExcerpt<'a> {
+    part: &'a str,
+}
+
+fn main() {
+    let string1 = String::from("abcd");
+    {
+    let string2 = "xyz";
+
+    let result = longest(string1.as_str(), string2);
+    //dbg!(result);
+    }
+
+    let script = String::from("Before time began, there was the cube. We know not where it comes from.");
+    let first_sentence = script.split('.')
+        .next()
+        .expect("Could not find a '.'");
+    let i = ImportantExcerpt { part: first_sentence };
+    dbg!(i.part);
+}
diff --git a/lifetimes/target/.rustc_info.json b/lifetimes/target/.rustc_info.json
new file mode 100644
index 0000000..63426f8
--- /dev/null
+++ b/lifetimes/target/.rustc_info.json
@@ -0,0 +1 @@
+{"rustc_fingerprint":13848232676847739476,"outputs":{"15337506775154344876":["___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/home/adam/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\ndebug_assertions\nproc_macro\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\nunix\n",""],"1617349019360157463":["___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/home/adam/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\ndebug_assertions\nproc_macro\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\nunix\n",""],"1164083562126845933":["rustc 1.32.0 (9fda7c223 2019-01-16)\nbinary: rustc\ncommit-hash: 9fda7c2237db910e41d6a712e9a2139b352e558b\ncommit-date: 2019-01-16\nhost: x86_64-unknown-linux-gnu\nrelease: 1.32.0\nLLVM version: 8.0\n",""]},"successes":{}}
\ No newline at end of file
diff --git a/lifetimes/target/debug/.cargo-lock b/lifetimes/target/debug/.cargo-lock
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/lifetimes/target/debug/.cargo-lock
diff --git a/lifetimes/target/debug/.fingerprint/lifetimes-efb5637f417930c3/bin-lifetimes-efb5637f417930c3 b/lifetimes/target/debug/.fingerprint/lifetimes-efb5637f417930c3/bin-lifetimes-efb5637f417930c3
new file mode 100644
index 0000000..f146f56
--- /dev/null
+++ b/lifetimes/target/debug/.fingerprint/lifetimes-efb5637f417930c3/bin-lifetimes-efb5637f417930c3
@@ -0,0 +1 @@
+c7df6e6b96a818a1
\ No newline at end of file
diff --git a/lifetimes/target/debug/.fingerprint/lifetimes-efb5637f417930c3/bin-lifetimes-efb5637f417930c3.json b/lifetimes/target/debug/.fingerprint/lifetimes-efb5637f417930c3/bin-lifetimes-efb5637f417930c3.json
new file mode 100644
index 0000000..3f090d3
--- /dev/null
+++ b/lifetimes/target/debug/.fingerprint/lifetimes-efb5637f417930c3/bin-lifetimes-efb5637f417930c3.json
@@ -0,0 +1 @@
+{"rustc":11779505878581416876,"features":"[]","target":17218091323931530620,"profile":1241200217276728497,"path":1036222786711178230,"deps":[],"local":[{"MtimeBased":[[1550322003,293604958],".fingerprint/lifetimes-efb5637f417930c3/dep-bin-lifetimes-efb5637f417930c3"]}],"rustflags":[],"edition":"Edition2018"}
\ No newline at end of file
diff --git a/lifetimes/target/debug/.fingerprint/lifetimes-efb5637f417930c3/dep-bin-lifetimes-efb5637f417930c3 b/lifetimes/target/debug/.fingerprint/lifetimes-efb5637f417930c3/dep-bin-lifetimes-efb5637f417930c3
new file mode 100644
index 0000000..e046c38
--- /dev/null
+++ b/lifetimes/target/debug/.fingerprint/lifetimes-efb5637f417930c3/dep-bin-lifetimes-efb5637f417930c3
diff --git a/lifetimes/target/debug/deps/lifetimes-efb5637f417930c3 b/lifetimes/target/debug/deps/lifetimes-efb5637f417930c3
new file mode 100755
index 0000000..8edfb67
--- /dev/null
+++ b/lifetimes/target/debug/deps/lifetimes-efb5637f417930c3
diff --git a/lifetimes/target/debug/deps/lifetimes-efb5637f417930c3.d b/lifetimes/target/debug/deps/lifetimes-efb5637f417930c3.d
new file mode 100644
index 0000000..0a866ec
--- /dev/null
+++ b/lifetimes/target/debug/deps/lifetimes-efb5637f417930c3.d
@@ -0,0 +1,5 @@
+/home/adam/devel/learning-rust/lifetimes/target/debug/deps/lifetimes-efb5637f417930c3: src/main.rs
+
+/home/adam/devel/learning-rust/lifetimes/target/debug/deps/lifetimes-efb5637f417930c3.d: src/main.rs
+
+src/main.rs:
diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/10oafshzgt3w3xeo.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/10oafshzgt3w3xeo.o
new file mode 100644
index 0000000..46d47f0
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+++ b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/10oafshzgt3w3xeo.o
diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/12ep0b6r7gf5xev8.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/12ep0b6r7gf5xev8.o
new file mode 100644
index 0000000..a010637
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+++ b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/12ep0b6r7gf5xev8.o
diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/15o4oy1d5i2cot5y.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/15o4oy1d5i2cot5y.o
new file mode 100644
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+++ b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/15o4oy1d5i2cot5y.o
diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/1dqcrqv4ajxjkaig.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/1dqcrqv4ajxjkaig.o
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diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/1dswbkuzj3w28w51.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/1dswbkuzj3w28w51.o
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diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/1imy25kgsjnvggrs.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/1imy25kgsjnvggrs.o
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diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/3o7odmue6rclr07q.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/3o7odmue6rclr07q.o
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diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/3ovm9mpazp54gvkw.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/3ovm9mpazp54gvkw.o
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diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/4glxfcni5mbpugli.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/4glxfcni5mbpugli.o
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diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/4inaqhg23zqxyqnc.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/4inaqhg23zqxyqnc.o
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+++ b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/4inaqhg23zqxyqnc.o
diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/4m39n3seakb54iax.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/4m39n3seakb54iax.o
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diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/4z4nzjl4q0pz1f04.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/4z4nzjl4q0pz1f04.o
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+++ b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/4z4nzjl4q0pz1f04.o
diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/50eev5qtb13tzx9b.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/50eev5qtb13tzx9b.o
new file mode 100644
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diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/51gmswjzv1agzg8f.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/51gmswjzv1agzg8f.o
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diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/5d28jwqkfvzyq5h1.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/5d28jwqkfvzyq5h1.o
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+++ b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/5d28jwqkfvzyq5h1.o
diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/b9nyaare4e7lyek.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/b9nyaare4e7lyek.o
new file mode 100644
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+++ b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/b9nyaare4e7lyek.o
diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/dep-graph.bin b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/dep-graph.bin
new file mode 100644
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+++ b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/dep-graph.bin
diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/pqtu3yin1ijq83m.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/pqtu3yin1ijq83m.o
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diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/query-cache.bin b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/query-cache.bin
new file mode 100644
index 0000000..4a19fa1
--- /dev/null
+++ b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/query-cache.bin
diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/tq446ynsxari1o4.o b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/tq446ynsxari1o4.o
new file mode 100644
index 0000000..3bc6782
--- /dev/null
+++ b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/tq446ynsxari1o4.o
diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/work-products.bin b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/work-products.bin
new file mode 100644
index 0000000..00826d6
--- /dev/null
+++ b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8-20lj7ul63d9hr/work-products.bin
diff --git a/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8.lock b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8.lock
new file mode 100755
index 0000000..e69de29
--- /dev/null
+++ b/lifetimes/target/debug/incremental/lifetimes-2xzusyx2j7lm/s-f9jk3gevx7-13gs7v8.lock
diff --git a/lifetimes/target/debug/lifetimes b/lifetimes/target/debug/lifetimes
new file mode 100755
index 0000000..8edfb67
--- /dev/null
+++ b/lifetimes/target/debug/lifetimes
diff --git a/lifetimes/target/debug/lifetimes.d b/lifetimes/target/debug/lifetimes.d
new file mode 100644
index 0000000..deabab0
--- /dev/null
+++ b/lifetimes/target/debug/lifetimes.d
@@ -0,0 +1 @@
+/home/adam/devel/learning-rust/lifetimes/target/debug/lifetimes: /home/adam/devel/learning-rust/lifetimes/src/main.rs
diff --git a/minigrep/src/lib.rs b/minigrep/src/lib.rs
new file mode 100644
index 0000000..78610ba
--- /dev/null
+++ b/minigrep/src/lib.rs
@@ -0,0 +1,29 @@
+use std::error::Error;
+use std::fs;
+
+pub struct Config {
+    pub query: String,
+    pub filename: String,
+}
+
+impl Config {
+
+    pub fn new(args: &[String]) -> Result<Config, &'static str> {
+
+        if args.len() < 3 {
+            return Err("Not enough arguments.");
+        }
+
+        let query = args[1].clone();
+        let filename = args[2].clone();
+        Ok(Config { query, filename })
+    }
+
+}
+
+pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
+    let contents = fs::read_to_string(config.filename)?;
+    dbg!(contents);
+    Ok(())
+}
+
diff --git a/minigrep/src/main.rs b/minigrep/src/main.rs
index 1e04b5e..fc5ae9a 100644
--- a/minigrep/src/main.rs
+++ b/minigrep/src/main.rs
@@ -1,6 +1,8 @@
 use std::process;
 use std::env;
-use std::fs;
+
+use minigrep;
+use minigrep::Config;
 
 fn main() {
     let args: Vec<String> = env::args().collect();
@@ -8,33 +10,11 @@ fn main() {
         println!("Problem parsing arguments: {}", err);
         process::exit(1);
     });
-
-    println!("Searching for {}", config.query);
-    println!("In file {}", config.filename);
-
-    let contents = fs::read_to_string(config.filename)
-        .expect("something went wrong.");
-
-    dbg!(contents);
-}
-
-struct Config {
-    query: String,
-    filename: String,
-}
-
-impl Config {
-
-
-    fn new(args: &[String]) -> Result<Config, &'static str> {
-
-        if args.len() < 3 {
-            panic!("not enough args");
-        }
-
-        let query = args[1].clone();
-        let filename = args[2].clone();
-        Ok(Config { query, filename })
+    println!("\nSearching for {}", config.query);
+    println!("    in file {}", config.filename);
+    if let Err(e) = minigrep::run(config) {
+        println!("Application error: {}", e);
+        process::exit(1);
     }
-
 }
+