feat(v1): Add utility to auto-translate v1 to v2

src/document.rs

@@ -359,6 +359,15 @@ impl KdlDocument {
         let ret: Result<kdlv1::KdlDocument, kdlv1::KdlError> = s.parse();
         ret.map(|x| x.into()).map_err(|e| e.into())
     }
+
+    /// Takes a KDL v1 document string and returns the same document, but
+    /// autoformatted into valid KDL v2 syntax.
+    #[cfg(feature = "v1")]
+    pub fn v1_to_v2(s: &str) -> Result<String, KdlParseFailure> {
+        let mut doc = KdlDocument::parse_v1(s)?;
+        doc.autoformat();
+        Ok(doc.to_string())
+    }
 }
 
 #[cfg(feature = "v1")]
@@ -946,4 +955,90 @@ inline { time; to; live "our" "dreams"; "y;all" }
         include_str!("../examples/zellij-unquoted-bindings.kdl").parse::<KdlDocument>()?;
         Ok(())
     }
+
+    #[ignore = "Formatting is still seriously broken, and this is gonna need some extra love."]
+    #[cfg(feature = "v1")]
+    #[test]
+    fn v1_to_v2() -> miette::Result<()> {
+        let original = r##"
+// If you'd like to override the default keybindings completely, be sure to change "keybinds" to "keybinds clear-defaults=true"
+keybinds {
+    normal {
+        // uncomment this and adjust key if using copy_on_select=false
+        // bind "Alt c" { Copy; }
+    }
+    locked {
+        bind "Ctrl g" { SwitchToMode "Normal"; }
+    }
+    resize {
+        bind "Ctrl n" { SwitchToMode "Normal"; }
+        bind "h" "Left" { Resize "Increase Left"; }
+        bind "j" "Down" { Resize "Increase Down"; }
+        bind "k" "Up" { Resize "Increase Up"; }
+        bind "l" "Right" { Resize "Increase Right"; }
+        bind "H" { Resize "Decrease Left"; }
+        bind "J" { Resize "Decrease Down"; }
+        bind "K" { Resize "Decrease Up"; }
+        bind "L" { Resize "Decrease Right"; }
+        bind "=" "+" { Resize "Increase"; }
+        bind "-" { Resize "Decrease"; }
+    }
+}
+// Plugin aliases - can be used to change the implementation of Zellij
+// changing these requires a restart to take effect
+plugins {
+    tab-bar location="zellij:tab-bar"
+    status-bar location="zellij:status-bar"
+    welcome-screen location="zellij:session-manager" {
+        welcome_screen true
+    }
+    filepicker location="zellij:strider" {
+        cwd "/"
+    }
+}
+mouse_mode false
+mirror_session true
+"##;
+        let expected = r##"
+// If you'd like to override the default keybindings completely, be sure to change "keybinds" to "keybinds clear-defaults=true"
+keybinds {
+    normal {
+        // uncomment this and adjust key if using copy_on_select=false
+        // bind "Alt c" { Copy; }
+    }
+    locked {
+        bind "Ctrl g" { SwitchToMode Normal; }
+    }
+    resize {
+        bind "Ctrl n" { SwitchToMode Normal; }
+        bind h Left { Resize "Increase Left"; }
+        bind j Down { Resize "Increase Down"; }
+        bind k Up { Resize "Increase Up"; }
+        bind l Right { Resize "Increase Right"; }
+        bind H { Resize "Decrease Left"; }
+        bind J { Resize "Decrease Down"; }
+        bind K { Resize "Decrease Up"; }
+        bind L { Resize "Decrease Right"; }
+        bind "=" + { Resize Increase; }
+        bind - { Resize Decrease; }
+    }
+}
+// Plugin aliases - can be used to change the implementation of Zellij
+// changing these requires a restart to take effect
+plugins {
+    tab-bar location=zellij:tab-bar
+    status-bar location=zellij:status-bar
+    welcome-screen location=zellij:session-manager {
+        welcome_screen #true
+    }
+    filepicker location=zellij:strider {
+        cwd "/"
+    }
+}
+mouse_mode #false
+mirror_session #true
+"##;
+        pretty_assertions::assert_eq!(KdlDocument::v1_to_v2(original)?, expected);
+        Ok(())
+    }
 }

src/entry.rs

@@ -165,13 +165,76 @@ impl KdlEntry {
     pub fn autoformat(&mut self) {
         // TODO once MSRV allows:
         //self.format.take_if(|f| !f.autoformat_keep);
+        let value_repr = self.format.as_ref().map(|x| {
+            match &self.value {
+                KdlValue::String(val) => {
+                    // cleanup. I don't _think_ this should have any whitespace,
+                    // but just in case.
+                    let s = x.value_repr.trim();
+                    // convert raw strings to new format
+                    let s = s.strip_prefix("r").unwrap_or(s);
+                    let s = if crate::value::is_plain_ident(val) {
+                        val.to_string()
+                    } else if s
+                        .find(|c| v2_parser::NEWLINES.iter().any(|nl| nl.contains(c)))
+                        .is_some()
+                    {
+                        // Multiline string. Need triple quotes if they're not there already.
+                        if s.contains("\"\"\"") {
+                            // We're probably good. This could be more precise, but close enough.
+                            s.to_string()
+                        } else {
+                            // `"` -> `"""` but also extra newlines need to be
+                            // added because v2 strips the first and last ones.
+                            let s = s.replacen("\"", "\"\"\"\n", 1);
+                            s.chars()
+                                .rev()
+                                .collect::<String>()
+                                .replacen("\"", "\"\"\"\n", 1)
+                                .chars()
+                                .rev()
+                                .collect::<String>()
+                        }
+                    } else if !s.starts_with("#") {
+                        // `/` is no longer an escaped char in v2.
+                        s.replace("\\/", "/")
+                    } else {
+                        // We're all good! Let's move on.
+                        s.to_string()
+                    };
+                    s
+                }
+                // These have `#` prefixes now. The regular Display impl will
+                // take care of that.
+                KdlValue::Bool(_) | KdlValue::Null => format!("{}", self.value),
+                // These should be fine as-is?
+                KdlValue::Integer(_) | KdlValue::Float(_) => x.value_repr.clone(),
+            }
+        });
+
         if !self
             .format
             .as_ref()
             .map(|f| f.autoformat_keep)
             .unwrap_or(false)
         {
-            self.format = None
+            self.format = None;
+        }
+
+        if let Some(value_repr) = value_repr.as_ref() {
+            self.format = Some(
+                self.format
+                    .clone()
+                    .map(|mut x| {
+                        x.value_repr = value_repr.into();
+                        x
+                    })
+                    .unwrap_or_else(|| KdlEntryFormat {
+                        value_repr: value_repr.into(),
+                        leading: " ".into(),
+                        ..Default::default()
+                    }),
+            )
         }
 
         if let Some(name) = &mut self.name {
@@ -455,4 +518,49 @@ mod test {
         let entry = KdlEntry::new_prop("name", KdlValue::Integer(42));
         assert_eq!(format!("{}", entry), "name=42");
     }
+
+    #[cfg(feature = "v1")]
+    #[test]
+    fn v1_to_v2_format() -> miette::Result<()> {
+        let mut entry = KdlEntry::parse_v1(r##"r#"hello, world!"#"##)?;
+        entry.autoformat();
+        assert_eq!(format!("{}", entry), r##" #"hello, world!"#"##);
+
+        let mut entry = KdlEntry::parse_v1(r#""hello, \" world!""#)?;
+        entry.autoformat();
+        assert_eq!(format!("{}", entry), r#" "hello, \" world!""#);
+
+        let mut entry = KdlEntry::parse_v1("\"foo!`~.,<>\"")?;
+        entry.autoformat();
+        assert_eq!(format!("{}", entry), " foo!`~.,<>");
+
+        let mut entry = KdlEntry::parse_v1("\"\nhello, world!\"")?;
+        entry.autoformat();
+        assert_eq!(format!("{}", entry), " \"\"\"\n\nhello, world!\n\"\"\"");
+
+        let mut entry = KdlEntry::parse_v1("r#\"\nhello, world!\"#")?;
+        entry.autoformat();
+        assert_eq!(format!("{}", entry), " #\"\"\"\n\nhello, world!\n\"\"\"#");
+
+        let mut entry = KdlEntry::parse_v1("true")?;
+        entry.autoformat();
+        assert_eq!(format!("{}", entry), " #true");
+
+        let mut entry = KdlEntry::parse_v1("false")?;
+        entry.autoformat();
+        assert_eq!(format!("{}", entry), " #false");
+
+        let mut entry = KdlEntry::parse_v1("null")?;
+        entry.autoformat();
+        assert_eq!(format!("{}", entry), " #null");
+
+        let mut entry = KdlEntry::parse_v1("1_234_567")?;
+        entry.autoformat();
+        assert_eq!(format!("{}", entry), " 1_234_567");
+
+        let mut entry = KdlEntry::parse_v1("1_234_567E-10")?;
+        entry.autoformat();
+        assert_eq!(format!("{}", entry), " 1_234_567E-10");
+        Ok(())
+    }
 }

src/lib.rs

@@ -10,11 +10,20 @@
 //! You can think of this crate as
 //! [`toml_edit`](https://crates.io/crates/toml_edit), but for KDL.
 //!
-//! This crate supports parsing [the final KDL 2.0.0
-//! draft](https://github.com/kdl-org/kdl/pull/434), which might get a couple
-//! more small modifications before things are truly finalized. It does not
-//! support KDL 1.0 as of this release, but versions of this crate lower than
-//! 5.0 do.
+//! This crate supports both KDL v2.0.0 and v1.0.0 (when using the non-default
+//! `v1` feature).
+//!
+//! There is also a `v1-fallback` feature that may be enabled in order to have
+//! the various `Kdl*::parse` methods try to parse their input as v2, and, if
+//! that fails, try again as v1. In either case, a dedicated `Kdl*::parse_v1`
+//! method is available for v1-exclusive parsing, as long as either `v1` or
+//! `v1-fallback` are enabled.
+//!
+//! Autoformatting a document parsed from a v1 doc will translate the document
+//! to v2 format, preserving as much of the v1 trivia as possible (comments,
+//! etc). It *should* generate a fully valid v2 document, but there may still be
+//! some corner cases that don't translate well. Please file issues as needed
+//! for those.
 //!
 //! ## Example
 //!

src/v2_parser.rs

@@ -1578,7 +1578,7 @@ fn escline_test() {
     assert_eq!(node.entries().len(), 2);
 }
 
-static NEWLINES: [&str; 7] = [
+pub(crate) static NEWLINES: [&str; 7] = [
     "\u{000D}\u{000A}",
     "\u{000D}",
     "\u{000A}",

src/value.rs

@@ -174,7 +174,7 @@ impl Display for KdlValue {
     }
 }
 
-fn is_plain_ident(ident: &str) -> bool {
+pub(crate) fn is_plain_ident(ident: &str) -> bool {
     let ident_bytes = ident.as_bytes();
     ident
         .find(crate::v2_parser::is_disallowed_ident_char)