improve requoting heuristic

First of all, this allows : to be part of a word. This has been added
because the account names start with a colon, so -player :Dunje should
work.

Furthermore, the re-quoting now also quotes strings that contain a .+*,
as those are characters usually used in regular expressions. A command
line like
    raidgrep -- -player "G.dric"
should work, so we either have to re-quote words with a dot, or allow
the dot to be part of a (lexical) word as well. For now, we're
re-quoting it, but if it turns out to be too troublesome, we might
change that.

3 files changed, 50 insertions, 13 deletions

diff --git a/src/fexpr/grammar.lalrpop b/src/fexpr/grammar.lalrpop
index 4cb1849..c0165ce 100644
--- a/src/fexpr/grammar.lalrpop
+++ b/src/fexpr/grammar.lalrpop
@@ -173,7 +173,7 @@ match {
 
     r"\d\d\d\d-\d\d-\d\d \d\d:\d\d:\d\d" => datetime,
     r"\d\d\d\d-\d\d-\d\d" => date,
-    r"\w+" => word,
+    r"[\w:]+" => word,
     r#""[^"]*""# => string,
 
     _
diff --git a/src/fexpr/mod.rs b/src/fexpr/mod.rs
index 391b739..2bdbfe7 100644
--- a/src/fexpr/mod.rs
+++ b/src/fexpr/mod.rs
@@ -7,6 +7,7 @@ use super::{filters, FightOutcome, SearchField};
 
 use std::{error, fmt};
 
+use itertools::Itertools;
 use lalrpop_util::{lalrpop_mod, lexer::Token, ParseError};
 use thiserror::Error;
 
@@ -64,3 +65,50 @@ pub fn location<T>(err: &ParseError<usize, T, FError>) -> usize {
         ParseError::User { ref error } => error.location,
     }
 }
+
+/// "Re-quotes" a list of string pieces to a long, whitespace separated string.
+///
+/// This function is needed because the shell already does some argument parsing, so if the user
+/// specifies `-player "godric gobbledygook"` on the command line, we will get `["-player", "godric
+/// gobbledygook"]` as the arguments. Howvever, our parser expects a single string, so we re-join
+/// the pieces and apply the quotes where necessary.
+///
+/// Note that this works on a "best guess" method, as we cannot reconstruct the shell's quotes 1:1.
+/// This means that some things that work on the command line won't work in the REPL, and vice
+/// versa.
+///
+/// ```
+/// assert_eq!(
+///     requote(&["-player", "godric gobbledygook"]),
+///     r#"-player "godric gobbledygook""#,
+/// );
+/// ```
+pub fn requote<S: AsRef<str>, T: IntoIterator<Item = S>>(items: T) -> String {
+    const SPECIAL_CHARS: &[char] = &[' ', '.', '^', '$', '+', '+'];
+    items
+        .into_iter()
+        .map(|part| {
+            let part = part.as_ref();
+            if part.contains(SPECIAL_CHARS) {
+                format!(r#""{}""#, part)
+            } else {
+                part.into()
+            }
+        })
+        .join(" ")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_requote() {
+        assert_eq!(
+            requote(&["-player", "godric gobbledygook"]),
+            r#"-player "godric gobbledygook""#,
+        );
+        assert_eq!(requote(&["-player", "godric"]), r#"-player godric"#,);
+        assert_eq!(requote(&["-player", "g.dric"]), r#"-player "g.dric""#,);
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 33b3c45..cb67968 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,7 +9,6 @@ use std::str::FromStr;
 use anyhow::{anyhow, Error, Result};
 use chrono::{DateTime, TimeZone, Utc};
 use colored::Colorize;
-use itertools::Itertools;
 use log::debug;
 use regex::Regex;
 use rustyline::Editor;
@@ -284,17 +283,7 @@ fn single(opt: &Opt) -> Result<()> {
         return grep(opt, &*maybe_filter?);
     }
 
-    let expr_string = opt
-        .expression
-        .iter()
-        .map(|part| {
-            if part.contains(' ') {
-                format!(r#""{}""#, part)
-            } else {
-                part.into()
-            }
-        })
-        .join(" ");
+    let expr_string = fexpr::requote(&opt.expression);
     let filter = build_filter(&expr_string)?;
     grep(&opt, &*filter)?;
     Ok(())