Add support for multiline variables

Fixes #628

Cargo.lock

@@ -325,7 +325,7 @@ dependencies = [
 
 [[package]]
 name = "navi"
-version = "2.17.2"
+version = "2.18.0"
 dependencies = [
  "anyhow",
  "clap",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "navi"
-version = "2.17.2"
+version = "2.18.0"
 authors = ["Denis Isidoro <denis_isidoro@live.com>"]
 edition = "2018"
 description = "An interactive cheatsheet tool for the command-line"

src/parser.rs

@@ -175,6 +175,8 @@ pub fn read_lines(
 
     let mut should_break = false;
 
+    let mut variable_cmd = String::from("");
+
     for (line_nr, line_result) in lines.enumerate() {
         let line = line_result
             .with_context(|| format!("Failed to read line number {} in cheatsheet `{}`", line_nr, id))?;
@@ -212,18 +214,27 @@ pub fn read_lines(
             item.comment = without_prefix(&line);
         }
         // variable
-        else if line.starts_with('$') && line.contains(':') {
+        else if !variable_cmd.is_empty() || (line.starts_with('$') && line.contains(':')) {
             should_break = write_cmd(&item, stdin, allowlist, denylist, visited_lines).is_err();
+
             item.snippet = String::from("");
-            let (variable, command, opts) = parse_variable_line(&line).with_context(|| {
+
+            variable_cmd.push_str(line.trim_end_matches('\\'));
+
+            if !line.ends_with('\\') {
+                let full_variable_cmd = variable_cmd.clone();
+                let (variable, command, opts) =
+                    parse_variable_line(&full_variable_cmd).with_context(|| {
                         format!(
                             "Failed to parse variable line. See line number {} in cheatsheet `{}`",
                             line_nr + 1,
                             id
                         )
                     })?;
+                variable_cmd = String::from("");
                 variables.insert_suggestion(&item.tags, variable, (String::from(command), opts));
             }
+        }
         // snippet
         else {
             if !(&item.snippet).is_empty() {

tests/no_prompt_cheats/cases.cheat

@@ -58,6 +58,9 @@ echo "foo" \
     && echo "match" \
     || echo "no match"
 
+# multiline variable -> "foo bar"
+echo "<multilinevar>"
+
 $ x: echo '2'
 $ x2: echo "$((x+10))"
 $ y: echo 'a'
@@ -66,8 +69,12 @@ $ language2: echo '1;clojure;clojure.org' --- --column 2 --delimiter ';'
 $ multiword: echo 'foo bar'
 $ pictures_folder: echo "/my/pictures"
 $ map1: echo "foo" --- --map 'echo _$(cat)_'
+$ multilinevar: echo "xoo yar" \
+   | tr 'x' 'f' \
+   | tr 'y' 'b'
 $ expand1: echo "foo" --- --expand
 
+
 # this should be displayed -> "hi"
 echo hi