From a3a177159085b7a26d79fb39e2ddda653aac766a Mon Sep 17 00:00:00 2001
From: Philipp Gesang <phg@phi-gamma.net>
Date: Sun, 7 Aug 2022 08:48:38 +0200
Subject: bin: prepare for scheme editor
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Optionally build against slint (sixtyfps) to provide an “edit”
subcommand.
---
 Cargo.toml   |  2 ++
 src/vtcol.rs | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/Cargo.toml b/Cargo.toml
index ac7f62c..6aca9fc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,9 +18,11 @@ libc        = "0.2"
 clap        = { version = "2.33", optional = true }
 anyhow      = { version = "1.0", optional = true }
 base64      = "0.13"
+slint       = { version = "0.2", optional = true }
 
 [features]
 vtcol-bin   = [ "anyhow", "clap" ]
+gui         = [ "vtcol-bin", "slint" ]
 
 [[bin]]
 name                    = "vtcol"
diff --git a/src/vtcol.rs b/src/vtcol.rs
index 8b86e07..122b471 100644
--- a/src/vtcol.rs
+++ b/src/vtcol.rs
@@ -462,6 +462,17 @@ impl<'a> Job
                                     .takes_value(true),
                             ),
                     )
+                    .subcommand(
+                        SubCommand::with_name("edit")
+                            .about("launch a graphical color scheme editor")
+                            .arg(
+                                Arg::with_name("scheme")
+                                    .help("name of the scheme to edit")
+                                    .required(false)
+                                    .value_name("NAME")
+                                    .takes_value(true),
+                            ),
+                    )
                     .subcommand(
                         SubCommand::with_name("list")
                             .about("list builtin schemes"),
@@ -786,6 +797,20 @@ impl<'a> Job
                         }
                         Err(anyhow!("dump requires an argument"))
                     },
+                    ("edit", Some(subm)) => {
+                        #[cfg(feature = "gui")]
+                        if let Some(name) = subm.value_of("scheme") {
+                            let scm = Scheme::from(name);
+                            Ok(Self(con, Subcmd::Colors(ColorJob::Dump(scm))))
+                        } else {
+                            todo!() /* generate generic name */
+                        }
+                        #[cfg(not(feature = "gui"))]
+                        Err(anyhow!(
+                            "the ``edit'' subcommand requires vtcol to be \
+                             built with the the ``gui'' feature"
+                        ))
+                    },
                     ("list", _) =>
                         Ok(Self(con, Subcmd::Colors(ColorJob::List))),
                     ("set", Some(subm)) => {
-- 
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