switch from cargo to structopt for arg parsing

Cargo exported its own arg parsing interface that's based on clap. To
break the dependence on Cargo for everything, switch to parsing
arguments in the binary using structopt.

4 files changed, 183 insertions, 32 deletions

diff --git a/Cargo.lock b/Cargo.lock
index af0346c..8584cce 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -16,6 +16,14 @@ dependencies = [
 ]
 
 [[package]]
+name = "ansi_term"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "atty"
 version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -60,6 +68,11 @@ version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "bitflags"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "cargo"
 version = "0.21.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -108,8 +121,7 @@ name = "cargo-ebuild"
 version = "0.1.6-pre"
 dependencies = [
  "cargo 0.21.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "structopt 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -124,6 +136,20 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "clap"
+version = "2.32.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "atty 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "textwrap 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "cmake"
 version = "0.1.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -475,6 +501,14 @@ version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "proc-macro2"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "psapi-sys"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -489,6 +523,14 @@ version = "0.3.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "quote"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "rand"
 version = "0.3.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -604,6 +646,30 @@ version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "strsim"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "structopt"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "structopt-derive 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "structopt-derive"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.14.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "syn"
 version = "0.11.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -614,6 +680,16 @@ dependencies = [
 ]
 
 [[package]]
+name = "syn"
+version = "0.14.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "synom"
 version = "0.11.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -657,6 +733,14 @@ dependencies = [
 ]
 
 [[package]]
+name = "textwrap"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "thread_local"
 version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -698,11 +782,21 @@ version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "unicode-width"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "unicode-xid"
 version = "0.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "unicode-xid"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "unreachable"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -734,6 +828,11 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "vec_map"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "void"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -744,11 +843,30 @@ version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "winapi"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "winapi-build"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "wincolor"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -769,14 +887,17 @@ dependencies = [
 [metadata]
 "checksum advapi32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e06588080cb19d0acb6739808aafa5f26bfb2ca015b2b6370028b44cf7cb8a9a"
 "checksum aho-corasick 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "500909c4f87a9e52355b26626d890833e9e1d53ac566db76c36faa984b889699"
+"checksum ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
 "checksum atty 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "21e50800ec991574876040fff8ee46b136a53e985286fbe6a3bdfe6421b78860"
 "checksum backtrace 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "99f2ce94e22b8e664d95c57fff45b98a966c2252b60691d0b7aeeccd88d70983"
 "checksum backtrace-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "44585761d6161b0f57afc49482ab6bd067e4edef48c12a152c237eb0203f7661"
 "checksum bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "aad18937a628ec6abcd26d1489012cc0e18c21798210f491af69ded9b881106d"
 "checksum bitflags 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1370e9fc2a6ae53aea8b7a5110edbd08836ed87c88736dfabccade1c2b44bff4"
+"checksum bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "d0c54bb8f454c567f21197eefcdbf5679d0bd99f2ddbe52e84c77061952e6789"
 "checksum cargo 0.21.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e053e40f9e9ed856ca202a32898893a3f1173c4e4e8888de6c2affeb0f689628"
 "checksum cc 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a9b13a57efd6b30ecd6598ebdb302cca617930b5470647570468a65d12ef9719"
 "checksum cfg-if 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "de1e760d7b6535af4241fca8bd8adf68e2e7edacc6b29f5d399050c5e48cf88c"
+"checksum clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b957d88f4b6a63b9d70d5f454ac8011819c6efa7727858f458ab71c756ce2d3e"
 "checksum cmake 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)" = "d18d68987ed4c516dcc3e7913659bfa4076f5182eea4a7e0038bb060953e76ac"
 "checksum crates-io 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "84b8ef70d98451b2d73bbbe50cb2b64c7a5765cad83ef3dec6ec943b96eac1c2"
 "checksum crossbeam 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "0c5ea215664ca264da8a9d9c3be80d2eaf30923c259d03e870388eb927508f97"
@@ -818,8 +939,10 @@ dependencies = [
 "checksum openssl-probe 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d98df0270d404ccd3c050a41d579c52d1db15375168bb3471e04ec0f5f378daf"
 "checksum openssl-sys 0.9.11 (registry+https://github.com/rust-lang/crates.io-index)" = "e5e0fd64cb2fa018ed2e7b2c8d9649114fe5da957c9a67432957f01e5dcc82e9"
 "checksum pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "3a8b4c6b8165cd1a1cd4b9b120978131389f64bdaf456435caa41e630edba903"
+"checksum proc-macro2 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "effdb53b25cdad54f8f48843d67398f7ef2e14f12c1b4cb4effc549a6462a4d6"
 "checksum psapi-sys 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "abcd5d1a07d360e29727f757a9decb3ce8bc6e0efa8969cfaad669a8317a2478"
 "checksum quote 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e920b65c65f10b2ae65c831a81a073a89edd28c7cce89475bff467ab4167a"
+"checksum quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "e44651a0dc4cdd99f71c83b561e221f714912d11af1a4dff0631f923d53af035"
 "checksum rand 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "022e0636ec2519ddae48154b028864bdce4eaf7d35226ab8e65c611be97b189d"
 "checksum redox_syscall 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)" = "29dbdfd4b9df8ab31dec47c6087b7b13cbf4a776f335e4de8efba8288dda075b"
 "checksum redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7e891cfe48e9100a70a3b6eb652fef28920c117d366339687bd5576160db0f76"
@@ -836,24 +959,35 @@ dependencies = [
 "checksum serde_json 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "ae1e67ce320daa7e494c578e34d4b00689f23bb94512fe0ca0dfaf02ea53fb67"
 "checksum shell-escape 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "dd5cc96481d54583947bfe88bf30c23d53f883c6cd0145368b69989d97b84ef8"
 "checksum strsim 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b4d15c810519a91cf877e7e36e63fe068815c678181439f2f29e2562147c3694"
+"checksum strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb4f380125926a99e52bc279241539c018323fab05ad6368b56f93d9369ff550"
+"checksum structopt 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "d8e9ad6a11096cbecdcca0cc6aa403fdfdbaeda2fb3323a39c98e6a166a1e45a"
+"checksum structopt-derive 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "4cbce8ccdc62166bd594c14396a3242bf94c337a51dbfa9be1076dd74b3db2af"
 "checksum syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d3b891b9015c88c576343b9b3e41c2c11a51c219ef067b264bd9c8aa9b441dad"
+"checksum syn 0.14.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c67da57e61ebc7b7b6fff56bb34440ca3a83db037320b0507af4c10368deda7d"
 "checksum synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a393066ed9010ebaed60b9eafa373d4b1baac186dd7e008555b0f702b51945b6"
 "checksum tar 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)" = "c2374f318bbe2c5ac6c83dd6240d5f1a73106f72d39b3f7d6f8d8637c7b425d8"
 "checksum tempdir 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "87974a6f5c1dfb344d733055601650059a3363de2a6104819293baff662132d6"
 "checksum termcolor 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "9065bced9c3e43453aa3d56f1e98590b8455b341d2fa191a1090c0dd0b242c75"
 "checksum termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "689a3bdfaab439fd92bc87df5c4c78417d3cbe537487274e9b0b2dce76e92096"
+"checksum textwrap 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "307686869c93e71f94da64286f9a9524c0f308a9e1c87a583de8e9c9039ad3f6"
 "checksum thread_local 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "1697c4b57aeeb7a536b647165a2825faddffb1d3bad386d507709bd51a90bb14"
 "checksum time 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)" = "211b63c112206356ef1ff9b19355f43740fc3f85960c598a93d3a3d3ba7beade"
 "checksum toml 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)" = "a7540f4ffc193e0d3c94121edb19b055670d369f77d5804db11ae053a45b6e7e"
 "checksum unicode-bidi 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "d3a078ebdd62c0e71a709c3d53d2af693fe09fe93fbff8344aebe289b78f9032"
 "checksum unicode-normalization 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "e28fa37426fceeb5cf8f41ee273faa7c82c47dc8fba5853402841e665fcd86ff"
+"checksum unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "882386231c45df4700b275c7ff55b6f3698780a650026380e72dabe76fa46526"
 "checksum unicode-xid 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "8c1f860d7d29cf02cb2f3f359fd35991af3d30bac52c57d265a3c461074cb4dc"
+"checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
 "checksum unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "382810877fe448991dfc7f0dd6e3ae5d58088fd0ea5e35189655f84e6814fa56"
 "checksum url 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f5ba8a749fb4479b043733416c244fa9d1d3af3d7c23804944651c8a448cb87e"
 "checksum user32-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4ef4711d107b21b410a3a974b1204d9accc8b10dad75d8324b5d755de1617d47"
 "checksum utf8-ranges 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "662fab6525a98beff2921d7f61a39e7d59e0b425ebc7d0d9e66d316e55124122"
+"checksum vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "05c78687fb1a80548ae3250346c3db86a80a7cdd77bda190189f2d0a0987c81a"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
+"checksum winapi 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "773ef9dcc5f24b7d850d0ff101e542ff24c3b090a9768e03ff889fdef41f00fd"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
+"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 "checksum wincolor 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a39ee4464208f6430992ff20154216ab2357772ac871d994c51628d60e58b8b0"
 "checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
diff --git a/Cargo.toml b/Cargo.toml
index f8ee0ea..7e7ccf4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,6 +26,5 @@ travis-ci = { repository = "cardoe/cargo-ebuild" }
 
 [dependencies]
 cargo = "^0.21"
-serde = "1"
-serde_derive = "1"
+structopt = "^0.2"
 time = "^0.1"
diff --git a/src/lib.rs b/src/lib.rs
index f6da6bf..0177556 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -9,8 +9,6 @@
  */
 
 extern crate cargo;
-#[macro_use]
-extern crate serde_derive;
 extern crate time;
 
 use cargo::core::registry::PackageRegistry;
@@ -61,16 +59,10 @@ fn resolve<'a>(
     Ok((packages, resolve))
 }
 
-#[derive(Deserialize)]
-pub struct Options {
-    flag_verbose: u32,
-    flag_quiet: Option<bool>,
-}
-
-pub fn real_main(options: Options, config: &Config) -> CliResult {
+pub fn run(verbose: u32, quiet: bool, config: &Config) -> CliResult {
     config.configure(
-        options.flag_verbose,
-        options.flag_quiet,
+        verbose,
+        Some(quiet),
         /* color */
         &None,
         /* frozen */
diff --git a/src/main.rs b/src/main.rs
index 9626f8e..658debc 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -10,28 +10,54 @@
 
 extern crate cargo;
 extern crate cargo_ebuild;
+#[macro_use]
+extern crate structopt;
 
+use cargo::core::shell::Shell;
 use cargo::Config;
-use cargo_ebuild::real_main;
-use std::env;
+use cargo_ebuild::run;
+use structopt::clap::AppSettings;
+use structopt::StructOpt;
 
-const USAGE: &'static str = r#"
-Create an ebuild for a project
-
-Usage:
-    cargo ebuild [options]
+#[derive(StructOpt, Debug)]
+struct Args {
+    /// Silence all output
+    #[structopt(short = "q", long = "quiet")]
+    quiet: bool,
+    /// Verbose mode (-v, -vv, -vvv, etc.)
+    #[structopt(short = "v", long = "verbose", parse(from_occurrences))]
+    verbose: usize,
+}
 
-Options:
-    -h, --help          Print this message
-    -v, --verbose       Use verbose output
-    -q, --quiet         No output printed to stdout
-"#;
+#[derive(StructOpt, Debug)]
+#[structopt(bin_name = "cargo")]
+enum Opt {
+    #[structopt(
+        name = "ebuild",
+        raw(
+            setting = "AppSettings::UnifiedHelpMessage",
+            setting = "AppSettings::DeriveDisplayOrder",
+            setting = "AppSettings::DontCollapseArgsInUsage"
+        )
+    )]
+    /// Generates an ebuild for a given Cargo project
+    Ebuild(Args),
+}
 
 fn main() {
-    let config = Config::default().unwrap();
-    let args = env::args().collect::<Vec<_>>();
-    let result = cargo::call_main_without_stdin(real_main, &config, USAGE, &args, false);
-    if let Err(e) = result {
-        cargo::exit_with_error(e, &mut *config.shell());
+    let Opt::Ebuild(opt) = Opt::from_args();
+
+    // create a default Cargo config
+    let mut config = match Config::default() {
+        Ok(cfg) => cfg,
+        Err(e) => {
+            let mut shell = Shell::new();
+            cargo::exit_with_error(e.into(), &mut shell)
+        }
+    };
+
+    // run the actual code
+    if let Err(e) = run(opt.verbose as u32, opt.quiet, &mut config) {
+        cargo::exit_with_error(e.into(), &mut *config.shell())
     }
 }