Better handling of errors, not good, but better.

Cargo.lock

@@ -19,6 +19,14 @@ dependencies = [
  "memchr 2.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "ansi_term"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "arrayvec"
 version = "0.4.10"
@@ -27,6 +35,16 @@ dependencies = [
  "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "atty"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.47 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "autocfg"
 version = "0.1.1"
@@ -100,6 +118,20 @@ name = "cfg-if"
 version = "0.1.6"
 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 = [
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+ "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "cloudabi"
 version = "0.0.3"
@@ -346,6 +378,14 @@ dependencies = [
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 ]
 
+[[package]]
+name = "heck"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-segmentation 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "html5ever"
 version = "0.22.5"
@@ -867,6 +907,14 @@ name = "redox_syscall"
 version = "0.1.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "redox_termios"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "regex"
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@@ -1027,6 +1075,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "serde"
 version = "1.0.84"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "serde_derive"
@@ -1127,6 +1178,31 @@ name = "string_cache_shared"
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 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]]
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+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 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
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+
+[[package]]
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+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+ "syn 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)",
+]
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 [[package]]
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@@ -1181,6 +1257,24 @@ dependencies = [
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 ]
 
+[[package]]
+name = "termion"
+version = "1.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.47 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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+
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+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 = "thin-slice"
 version = "0.1.1"
@@ -1366,6 +1460,11 @@ name = "unicode-normalization"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
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+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
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@@ -1417,6 +1516,11 @@ name = "vcpkg"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
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+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
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 version = "0.1.5"
@@ -1447,8 +1551,8 @@ dependencies = [
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- "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
+ "structopt 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -1534,6 +1641,7 @@ dependencies = [
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