From 8a5044a6aba2dea15733f830988887d6d4f5ca2a Mon Sep 17 00:00:00 2001 From: Harishankar Date: Sun, 31 May 2020 12:17:02 +0530 Subject: [PATCH] Added command history and editing using rustyline Used rustyline for command editing/history in interactive mode instead of the normal read_line() method of stdin --- Cargo.lock | 210 ++++++++++++++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 1 + src/main.rs | 22 +++--- 3 files changed, 222 insertions(+), 11 deletions(-) diff --git a/Cargo.lock b/Cargo.lock index 95687ca..42482f2 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -9,6 +9,18 @@ dependencies = [ "memchr", ] +[[package]] +name = "arrayref" +version = "0.3.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "a4c527152e37cf757a3f78aae5a06fbeefdb07ccc535c980a3208ee3060dd544" + +[[package]] +name = "arrayvec" +version = "0.5.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "cff77d8686867eceff3105329d4698d96c2391c176d5d03adc90c7389162b5b8" + [[package]] name = "atty" version = "0.2.14" @@ -20,6 +32,47 @@ dependencies = [ "winapi", ] +[[package]] +name = "autocfg" +version = "1.0.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "f8aac770f1885fd7e387acedd76065302551364496e46b3dd00860b2f8359b9d" + +[[package]] +name = "base64" +version = "0.11.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "b41b7ea54a0c9d92199de89e20e58d49f02f8e699814ef3fdf266f6f748d15c7" + +[[package]] +name = "bitflags" +version = "1.2.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693" + +[[package]] +name = "blake2b_simd" +version = "0.5.10" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "d8fb2d74254a3a0b5cac33ac9f8ed0e44aa50378d9dbb2e5d83bd21ed1dc2c8a" +dependencies = [ + "arrayref", + "arrayvec", + "constant_time_eq", +] + +[[package]] +name = "cc" +version = "1.0.54" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "7bbb73db36c1246e9034e307d0fba23f9a2e251faa47ade70c1bd252220c8311" + +[[package]] +name = "cfg-if" +version = "0.1.10" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822" + [[package]] name = "colored" version = "1.9.3" @@ -31,12 +84,63 @@ dependencies = [ "winapi", ] +[[package]] +name = "constant_time_eq" +version = "0.1.5" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "245097e9a4535ee1e3e3931fcfcd55a796a44c643e8596ff6566d68f09b87bbc" + +[[package]] +name = "crossbeam-utils" +version = "0.7.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "c3c7c73a2d1e9fc0886a08b93e98eb643461230d5f1925e4036204d5f2e261a8" +dependencies = [ + "autocfg", + "cfg-if", + "lazy_static", +] + +[[package]] +name = "dirs" +version = "2.0.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "13aea89a5c93364a98e9b37b2fa237effbb694d5cfe01c5b70941f7eb087d5e3" +dependencies = [ + "cfg-if", + "dirs-sys", +] + +[[package]] +name = "dirs-sys" +version = "0.3.4" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "afa0b23de8fd801745c471deffa6e12d248f962c9fd4b4c33787b055599bde7b" +dependencies = [ + "cfg-if", + "libc", + "redox_users", + "winapi", +] + [[package]] name = "evpf" version = "0.1.0" dependencies = [ "colored", "regex", + "rustyline", +] + +[[package]] +name = "getrandom" +version = "0.1.14" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "7abc8dd8451921606d809ba32e95b6111925cd2906060d2dcc29c070220503eb" +dependencies = [ + "cfg-if", + "libc", + "wasi", ] [[package]] @@ -60,12 +164,51 @@ version = "0.2.71" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "9457b06509d27052635f90d6466700c65095fdf75409b3fbdd903e988b886f49" +[[package]] +name = "log" +version = "0.4.8" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "14b6052be84e6b71ab17edffc2eeabf5c2c3ae1fdb464aae35ac50c67a44e1f7" +dependencies = [ + "cfg-if", +] + [[package]] name = "memchr" version = "2.3.3" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "3728d817d99e5ac407411fa471ff9800a778d88a24685968b36824eaf4bee400" +[[package]] +name = "nix" +version = "0.17.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "50e4785f2c3b7589a0d0c1dd60285e1188adac4006e8abd6dd578e1567027363" +dependencies = [ + "bitflags", + "cc", + "cfg-if", + "libc", + "void", +] + +[[package]] +name = "redox_syscall" +version = "0.1.56" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "2439c63f3f6139d1b57529d16bc3b8bb855230c8efcc5d3a896c8bea7c3b1e84" + +[[package]] +name = "redox_users" +version = "0.3.4" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "09b23093265f8d200fa7b4c2c76297f47e681c655f6f1285a8780d6a022f7431" +dependencies = [ + "getrandom", + "redox_syscall", + "rust-argon2", +] + [[package]] name = "regex" version = "1.3.8" @@ -84,6 +227,43 @@ version = "0.6.18" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "26412eb97c6b088a6997e05f69403a802a92d520de2f8e63c2b65f9e0f47c4e8" +[[package]] +name = "rust-argon2" +version = "0.7.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "2bc8af4bda8e1ff4932523b94d3dd20ee30a87232323eda55903ffd71d2fb017" +dependencies = [ + "base64", + "blake2b_simd", + "constant_time_eq", + "crossbeam-utils", +] + +[[package]] +name = "rustyline" +version = "6.1.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "1cd20b28d972040c627e209eb29f19c24a71a19d661cc5a220089176e20ee202" +dependencies = [ + "cfg-if", + "dirs", + "libc", + "log", + "memchr", + "nix", + "scopeguard", + "unicode-segmentation", + "unicode-width", + "utf8parse", + "winapi", +] + +[[package]] +name = "scopeguard" +version = "1.1.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd" + [[package]] name = "thread_local" version = "1.0.1" @@ -93,6 +273,36 @@ dependencies = [ "lazy_static", ] +[[package]] +name = "unicode-segmentation" +version = "1.6.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "e83e153d1053cbb5a118eeff7fd5be06ed99153f00dbcd8ae310c5fb2b22edc0" + +[[package]] +name = "unicode-width" +version = "0.1.7" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "caaa9d531767d1ff2150b9332433f32a24622147e5ebb1f26409d5da67afd479" + +[[package]] +name = "utf8parse" +version = "0.2.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "936e4b492acfd135421d8dca4b1aa80a7bfc26e702ef3af710e0752684df5372" + +[[package]] +name = "void" +version = "1.0.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d" + +[[package]] +name = "wasi" +version = "0.9.0+wasi-snapshot-preview1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519" + [[package]] name = "winapi" version = "0.3.8" diff --git a/Cargo.toml b/Cargo.toml index bac1457..2e0cb3d 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -9,3 +9,4 @@ edition = "2018" [dependencies] regex="1" colored="1.9.3" +rustyline="6.1.2" diff --git a/src/main.rs b/src/main.rs index d237193..f46dfab 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,15 +1,12 @@ -use std::io; -use std::io::Write; use regex::Regex; use colored::*; use std::env; +use rustyline::Editor; const ILLEGAL_EXP : &'static str = "Illegal Expression"; const ERR_PARSING_NOT_MATCH : &'static str = "Error parsing expression! \ Must be a number or operator (+,-,* or /)"; const ERR_POSTFIX_INCOMPLETE : &'static str = "Postfix expression incomplete!"; -const ERR_FLUSHING : &'static str = "Error flushing!"; -const ERR_READING_LINE : &'static str = "Error reading line!"; const HELP_TEXT : [&str ; 4] = ["Type a postfix expression to evaluate.", "Example: 4 5 + 12 -", @@ -165,15 +162,18 @@ fn run_interactive_mode (match_num : ®ex::Regex) { // get a line from input and evaluate it let mut expr = String::new (); + let mut rl = Editor::<()>::new (); // loop until a blank line is received loop { - expr.clear (); - print!("{}", "evpf>".bold() ); - io::stdout().flush ().expect (ERR_FLUSHING); - // read a line of text - io::stdin().read_line (&mut expr).expect (ERR_READING_LINE); - // trim the text - let expr = expr.trim (); + expr.clear (); + + let line = rl.readline ("evpf> "); + if line.is_err () { + break; + } + let hist = line.unwrap (); + rl.add_history_entry (&hist); + expr.push_str (&hist); if expr == "q" || expr == "Q" { // quit if the expression is q or Qs -- 2.20.1