Edit the value. Keep the source.

Parse, read, and edit CCL from Gleam. Your comments, key order, and indentation stay where you put them.

Gleam ≥ 1.11 · Erlang target · MIT

Document proof · set_intregistered

One entry changed.

The comment, block order, and two-space indentation remain fixed around the edit.

/= the server block
server =
  host = localhost
  port = 9090

Before: 8080
After: 9090
Surrounding lines: preserved

read-back safe

From install to edited source.

Four steps cover the full document loop. The API returns typed errors at every boundary, so the quickstart never hides failure behind placeholder helpers.

Add one runtime dependency.

ccl targets the Erlang VM and uses gleam_stdlib as its only runtime dependency.

gleam add ccl

Keep the source, not only the data.

parse returns an opaque Document that retains the original text and the options used to read it.

let assert Ok(doc) = ccl.parse(source)

Walk typed key paths.

Typed accessors return Result values and report missing keys or shape mismatches without crashing.

let assert Ok(8080) =\n  ccl.get_int(doc, ["server", "port"])

Change one value. Preserve the document.

Edits rewrite the affected entry in place. Comments, key order, and surrounding indentation stay intact.

let assert Ok(updated) =\n  ccl.set_int(doc, ["server", "port"], 9090)\n\nccl.to_string(updated)

Follow the source.

Learn the public ccl module by task. Hexdocs remains the complete function reference.

G-01Parsing and optionsChoose input, indentation, delimiter, tab, boolean, and list behavior.G-02Typed accessRead strings, numbers, booleans, lists, objects, and indexed list paths.G-03Editing and round tripsSet, append, remove, and comment without silently changing the source.G-04Dynamic decodingDecode CCL text into application types with lexical number and boolean decoders.

Make the first edit.

Start the quickstart