diff --git a/Cargo.lock b/Cargo.lock
index af806aa5..c4f795b9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,14 +1,5 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-[[package]]
-name = "aho-corasick"
-version = "0.7.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8716408b8bc624ed7f65d223ddb9ac2d044c0547b6fa4b0d554f3a9540496ada"
-dependencies = [
- "memchr",
-]
-
 [[package]]
 name = "anyhow"
 version = "1.0.31"
@@ -39,9 +30,9 @@ checksum = "e742194e0f43fc932bcb801708c2b279d3ec8f527e3acda05a6a9f342c5ef764"
 dependencies = [
  "argh_shared",
  "heck",
- "proc-macro2 1.0.13",
- "quote 1.0.6",
- "syn 1.0.22",
+ "proc-macro2",
+ "quote",
+ "syn",
 ]
 
 [[package]]
@@ -51,16 +42,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e1ba68f4276a778591e36a0c348a269888f3a177c8d2054969389e3b59611ff5"
 
 [[package]]
-name = "arrayref"
-version = "0.3.6"
+name = "async-task"
+version = "3.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4c527152e37cf757a3f78aae5a06fbeefdb07ccc535c980a3208ee3060dd544"
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cff77d8686867eceff3105329d4698d96c2391c176d5d03adc90c7389162b5b8"
+checksum = "c17772156ef2829aadc587461c7753af20b7e8db1529bc66855add962a3b35d3"
 
 [[package]]
 name = "autocfg"
@@ -68,21 +53,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8aac770f1885fd7e387acedd76065302551364496e46b3dd00860b2f8359b9d"
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b25d992356d2eb0ed82172f5248873db5560c4721f564b13cb5193bda5e668e"
-dependencies = [
- "byteorder",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-
 [[package]]
 name = "bitflags"
 version = "1.2.1"
@@ -90,27 +60,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
 [[package]]
-name = "blake2b_simd"
-version = "0.5.10"
+name = "cc"
+version = "1.0.54"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d8fb2d74254a3a0b5cac33ac9f8ed0e44aa50378d9dbb2e5d83bd21ed1dc2c8a"
-dependencies = [
- "arrayref",
- "arrayvec",
- "constant_time_eq",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08c48aae112d48ed9f069b33538ea9e3e90aa263cfa3d1c24309612b1f7472de"
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "df8670b8c7b9dae1793364eafadf7239c40d669904660c5960d74cfd80b46a53"
+checksum = "7bbb73db36c1246e9034e307d0fba23f9a2e251faa47ade70c1bd252220c8311"
 
 [[package]]
 name = "cfg-if"
@@ -119,10 +72,73 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b486ce3ccf7ffd79fdeb678eac06a9e6c09fc88d33836340becb8fffe87c5e33"
 
 [[package]]
-name = "constant_time_eq"
-version = "0.1.5"
+name = "cloudabi"
+version = "0.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "245097e9a4535ee1e3e3931fcfcd55a796a44c643e8596ff6566d68f09b87bbc"
+checksum = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
+dependencies = [
+ "bitflags",
+]
+
+[[package]]
+name = "crossbeam"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69323bff1fb41c635347b8ead484a5ca6c3f11914d784170b158d8449ab07f8e"
+dependencies = [
+ "cfg-if",
+ "crossbeam-channel",
+ "crossbeam-deque",
+ "crossbeam-epoch",
+ "crossbeam-queue",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-channel"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cced8691919c02aac3cb0a1bc2e9b73d89e832bf9a06fc579d4e71b68a2da061"
+dependencies = [
+ "crossbeam-utils",
+ "maybe-uninit",
+]
+
+[[package]]
+name = "crossbeam-deque"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9f02af974daeee82218205558e51ec8768b48cf524bd01d550abe5573a608285"
+dependencies = [
+ "crossbeam-epoch",
+ "crossbeam-utils",
+ "maybe-uninit",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "058ed274caafc1f60c4997b5fc07bf7dc7cca454af7c6e81edffe5f33f70dace"
+dependencies = [
+ "autocfg",
+ "cfg-if",
+ "crossbeam-utils",
+ "lazy_static",
+ "maybe-uninit",
+ "memoffset",
+ "scopeguard",
+]
+
+[[package]]
+name = "crossbeam-queue"
+version = "0.2.1"
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+checksum = "c695eeca1e7173472a32221542ae469b3e9aac3a4fc81f7696bcad82029493db"
+dependencies = [
+ "cfg-if",
+ "crossbeam-utils",
+]
 
 [[package]]
 name = "crossbeam-utils"
@@ -136,42 +152,30 @@ dependencies = [
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- "cfg-if",
- "dirs-sys",
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-checksum = "afa0b23de8fd801745c471deffa6e12d248f962c9fd4b4c33787b055599bde7b"
-dependencies = [
- "cfg-if",
+ "bitflags",
+ "crossterm_winapi",
+ "futures",
+ "lazy_static",
  "libc",
- "redox_users",
+ "mio",
+ "parking_lot",
+ "signal-hook",
  "winapi",
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 [[package]]
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-version = "0.7.1"
+name = "crossterm_winapi"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "057b7146d02fb50175fd7dbe5158f6097f33d02831f43b4ee8ae4ddf67b68f5c"
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- "anyhow",
- "libc",
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-
 [[package]]
 name = "futf"
 version = "0.1.4"
@@ -183,14 +187,98 @@ dependencies = [
 ]
 
 [[package]]
-name = "getrandom"
-version = "0.1.14"
+name = "futures"
+version = "0.3.5"
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+checksum = "1e05b85ec287aac0dc34db7d4a569323df697f9c55b99b15d6b4ef8cde49f613"
 dependencies = [
- "cfg-if",
- "libc",
- "wasi",
+ "futures-channel",
+ "futures-core",
+ "futures-executor",
+ "futures-io",
+ "futures-sink",
+ "futures-task",
+ "futures-util",
+]
+
+[[package]]
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+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f366ad74c28cca6ba456d95e6422883cfb4b252a83bed929c83abfdbbf2967d5"
+dependencies = [
+ "futures-core",
+ "futures-sink",
+]
+
+[[package]]
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+checksum = "59f5fff90fd5d971f936ad674802482ba441b6f09ba5e15fd8b39145582ca399"
+
+[[package]]
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+dependencies = [
+ "futures-core",
+ "futures-task",
+ "futures-util",
+]
+
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+version = "0.3.5"
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+checksum = "de27142b013a8e869c14957e6d2edeef89e97c289e69d042ee3a49acd8b51789"
+
+[[package]]
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+dependencies = [
+ "proc-macro-hack",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
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+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f2032893cb734c7a05d85ce0cc8b8c4075278e93b24b66f9de99d6eb0fa8acc"
+
+[[package]]
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+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bdb66b5f09e22019b1ab0830f7785bcea8e7a42148683f99214f73f8ec21a626"
+dependencies = [
+ "once_cell",
+]
+
+[[package]]
+name = "futures-util"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "futures-io",
+ "futures-macro",
+ "futures-sink",
+ "futures-task",
+ "memchr",
+ "pin-project",
+ "pin-utils",
+ "proc-macro-hack",
+ "proc-macro-nested",
+ "slab",
 ]
 
 [[package]]
@@ -208,7 +296,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "ropey",
- "smallvec 1.4.0",
+ "smallvec",
  "tendril",
 ]
 
@@ -218,8 +306,21 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "argh",
+ "crossterm",
+ "futures",
  "helix-core",
- "termwiz",
+ "num_cpus",
+ "piper",
+ "smol",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91780f809e750b0a89f5544be56617ff6b1227ee485bcb06ebe10cdf89bd3b71"
+dependencies = [
+ "libc",
 ]
 
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@@ -234,6 +335,15 @@ version = "0.2.70"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3baa92041a6fec78c687fa0cc2b3fae8884f743d672cf551bed1d6dac6988d0f"
 
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+name = "lock_api"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c4da24a77a3d8a6d4862d95f72e6fdb9c09a643ecdb402d754004a557f2bec75"
+dependencies = [
+ "scopeguard",
+]
+
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 name = "log"
 version = "0.4.8"
@@ -262,10 +372,37 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3728d817d99e5ac407411fa471ff9800a778d88a24685968b36824eaf4bee400"
 
 [[package]]
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+name = "memoffset"
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-checksum = "a64a92489e2744ce060c349162be1c5f33c6969234104dbd99ddb5feb08b8c15"
+checksum = "b4fc2c02a7e374099d4ee95a193111f72d2110197fe200272371758f6c3643d8"
+dependencies = [
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+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e9971bc8349a361217a8f2a41f5d011274686bd4436465ba51730921039d7fb"
+dependencies = [
+ "lazy_static",
+ "libc",
+ "log",
+ "miow",
+ "ntapi",
+ "winapi",
+]
+
+[[package]]
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+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22dfdd1d51b2639a5abd17ed07005c3af05fb7a2a3b1a1d0d7af1000a520c1c7"
+dependencies = [
+ "socket2",
+ "winapi",
+]
 
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 name = "new_debug_unreachable"
@@ -274,96 +411,116 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b471253da97532da4b61552249c521e01e736071f71c1a4f7ebbfbf0a06aad6"
+checksum = "50e4785f2c3b7589a0d0c1dd60285e1188adac4006e8abd6dd578e1567027363"
 dependencies = [
- "memchr",
- "version_check",
+ "bitflags",
+ "cc",
+ "cfg-if",
+ "libc",
+ "void",
 ]
 
 [[package]]
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+checksum = "7a31937dea023539c72ddae0e3571deadc1414b300483fa7aaec176168cfa9d2"
 dependencies = [
- "proc-macro2 0.4.30",
- "quote 0.6.13",
- "syn 0.15.44",
+ "winapi",
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+name = "num_cpus"
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+checksum = "05499f3756671c15885fee9034446956fff3f243d6077b91e5767df161f766b3"
 dependencies = [
- "autocfg",
+ "hermit-abi",
+ "libc",
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-name = "ordered-float"
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+name = "once_cell"
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+checksum = "0b631f7e854af39a1739f401cf34a8a013dfe09eac4fa4dba91e9768bd28168d"
+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3a704eb390aafdc107b0e392f56a82b668e3a71366993b5340f5833fd62505e"
 dependencies = [
- "num-traits",
+ "lock_api",
+ "parking_lot_core",
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 [[package]]
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+name = "parking_lot_core"
+version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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+checksum = "d58c7c768d4ba344e3e8d72518ac13e259d7c7ade24167003b8488e10b6740a3"
 dependencies = [
- "phf_shared",
+ "cfg-if",
+ "cloudabi",
+ "libc",
+ "redox_syscall",
+ "smallvec",
+ "winapi",
 ]
 
 [[package]]
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-checksum = "cbffee61585b0411840d3ece935cce9cb6321f01c45477d30066498cd5e1a815"
+checksum = "edc93aeee735e60ecb40cf740eb319ff23eab1c5748abfdb5c180e4ce49f7791"
 dependencies = [
- "phf_generator",
- "phf_shared",
+ "pin-project-internal",
 ]
 
 [[package]]
-name = "phf_generator"
-version = "0.8.0"
+name = "pin-project-internal"
+version = "0.4.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "17367f0cc86f2d25802b2c26ee58a7b23faeccf78a396094c13dced0d0182526"
+checksum = "e58db2081ba5b4c93bd6be09c40fd36cb9193a8336c384f3b40012e531aa7e40"
 dependencies = [
- "phf_shared",
- "rand",
+ "proc-macro2",
+ "quote",
+ "syn",
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+name = "pin-utils"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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+checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
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 dependencies = [
- "siphasher",
+ "crossbeam-utils",
+ "futures-io",
+ "futures-sink",
+ "futures-util",
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 [[package]]
-name = "ppv-lite86"
-version = "0.2.8"
+name = "proc-macro-hack"
+version = "0.5.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "237a5ed80e274dbc66f86bd59c1e25edc039660be53194b5fe0a482e0f2612ea"
+checksum = "7e0456befd48169b9f13ef0f0ad46d492cf9d2dbb918bcf38e01eed4ce3ec5e4"
 
 [[package]]
-name = "proc-macro2"
-version = "0.4.30"
+name = "proc-macro-nested"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
- "unicode-xid 0.1.0",
-]
+checksum = "8e946095f9d3ed29ec38de908c22f95d9ac008e424c7bcae54c75a79c527c694"
 
 [[package]]
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@@ -371,16 +528,7 @@ version = "1.0.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "53f5ffe53a6b28e37c9c1ce74893477864d64f74778a93a4beb43c8fa167f639"
 dependencies = [
- "unicode-xid 0.2.0",
-]
-
-[[package]]
-name = "quote"
-version = "0.6.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ce23b6b870e8f94f81fb0a363d65d86675884b34a09043c81e5562f11c1f8e1"
-dependencies = [
- "proc-macro2 0.4.30",
+ "unicode-xid",
 ]
 
 [[package]]
@@ -389,58 +537,7 @@ version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "54a21852a652ad6f610c9510194f398ff6f8692e334fd1145fed931f7fbe44ea"
 dependencies = [
- "proc-macro2 1.0.13",
-]
-
-[[package]]
-name = "rand"
-version = "0.7.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
-dependencies = [
- "getrandom",
- "libc",
- "rand_chacha",
- "rand_core",
- "rand_hc",
- "rand_pcg",
-]
-
-[[package]]
-name = "rand_chacha"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
-dependencies = [
- "ppv-lite86",
- "rand_core",
-]
-
-[[package]]
-name = "rand_core"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
-dependencies = [
- "getrandom",
-]
-
-[[package]]
-name = "rand_hc"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
-dependencies = [
- "rand_core",
-]
-
-[[package]]
-name = "rand_pcg"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "16abd0c1b639e9eb4d7c50c0b8100b0d0f849be2349829c740fe8e6eb4816429"
-dependencies = [
- "rand_core",
+ "proc-macro2",
 ]
 
 [[package]]
@@ -449,69 +546,25 @@ version = "0.1.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2439c63f3f6139d1b57529d16bc3b8bb855230c8efcc5d3a896c8bea7c3b1e84"
 
-[[package]]
-name = "redox_users"
-version = "0.3.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "09b23093265f8d200fa7b4c2c76297f47e681c655f6f1285a8780d6a022f7431"
-dependencies = [
- "getrandom",
- "redox_syscall",
- "rust-argon2",
-]
-
-[[package]]
-name = "regex"
-version = "1.3.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a6020f034922e3194c711b82a627453881bc4682166cabb07134a10c26ba7692"
-dependencies = [
- "aho-corasick",
- "memchr",
- "regex-syntax",
- "thread_local",
-]
-
-[[package]]
-name = "regex-syntax"
-version = "0.6.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fe5bd57d1d7414c6b5ed48563a2c855d995ff777729dcd91c369ec7fea395ae"
-
 [[package]]
 name = "ropey"
 version = "1.1.0"
 source = "git+https://github.com/cessen/ropey#083c34949274ef9800267e6bc64b76a45e401807"
 dependencies = [
- "smallvec 1.4.0",
+ "smallvec",
 ]
 
 [[package]]
-name = "rust-argon2"
-version = "0.7.0"
+name = "scoped-tls-hkt"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2bc8af4bda8e1ff4932523b94d3dd20ee30a87232323eda55903ffd71d2fb017"
-dependencies = [
- "base64 0.11.0",
- "blake2b_simd",
- "constant_time_eq",
- "crossbeam-utils",
-]
+checksum = "c2e9d7eaddb227e8fbaaa71136ae0e1e913ca159b86c7da82f3e8f0044ad3a63"
 
 [[package]]
-name = "semver"
-version = "0.9.0"
+name = "scopeguard"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
-dependencies = [
- "semver-parser",
-]
-
-[[package]]
-name = "semver-parser"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
+checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
 [[package]]
 name = "signal-hook"
@@ -520,6 +573,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ff2db2112d6c761e12522c65f7768548bd6e8cd23d2a9dae162520626629bd6"
 dependencies = [
  "libc",
+ "mio",
  "signal-hook-registry",
 ]
 
@@ -534,19 +588,10 @@ dependencies = [
 ]
 
 [[package]]
-name = "siphasher"
-version = "0.3.3"
+name = "slab"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa8f3741c7372e75519bd9346068370c9cdaabcc1f9599cbcf2a2719352286b7"
-
-[[package]]
-name = "smallvec"
-version = "0.6.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f7b0758c52e15a8b5e3691eae6cc559f08eee9406e548a4477ba4e67770a82b6"
-dependencies = [
- "maybe-uninit",
-]
+checksum = "c111b5bd5695e56cffe5129854aa230b39c93a305372fdbb2668ca2394eea9f8"
 
 [[package]]
 name = "smallvec"
@@ -555,14 +600,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c7cb5678e1615754284ec264d9bb5b4c27d2018577fd90ac0ceb578591ed5ee4"
 
 [[package]]
-name = "syn"
-version = "0.15.44"
+name = "smol"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9ca4b3b69a77cbe1ffc9e198781b7acb0c7365a883670e8f1c1bc66fba79a5c5"
+checksum = "686c634ad1873fffef6aed20f180eede424fbf3bb31802394c90fd7335a661b7"
 dependencies = [
- "proc-macro2 0.4.30",
- "quote 0.6.13",
- "unicode-xid 0.1.0",
+ "async-task",
+ "crossbeam",
+ "futures-io",
+ "futures-util",
+ "nix",
+ "once_cell",
+ "piper",
+ "scoped-tls-hkt",
+ "slab",
+ "socket2",
+ "wepoll-binding",
+]
+
+[[package]]
+name = "socket2"
+version = "0.3.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "03088793f677dce356f3ccc2edb1b314ad191ab702a5de3faf49304f7e104918"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "redox_syscall",
+ "winapi",
 ]
 
 [[package]]
@@ -571,9 +636,9 @@ version = "1.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1425de3c33b0941002740a420b1a906a350b88d08b82b2c8a01035a3f9447bac"
 dependencies = [
- "proc-macro2 1.0.13",
- "quote 1.0.6",
- "unicode-xid 0.2.0",
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
 ]
 
 [[package]]
@@ -586,85 +651,12 @@ dependencies = [
  "utf-8",
 ]
 
-[[package]]
-name = "terminfo"
-version = "0.7.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "76971977e6121664ec1b960d1313aacfa75642adc93b9d4d53b247bd4cb1747e"
-dependencies = [
- "dirs",
- "fnv",
- "nom",
- "phf",
- "phf_codegen",
-]
-
-[[package]]
-name = "termios"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f0fcee7b24a25675de40d5bb4de6e41b0df07bc9856295e7e2b3a3600c400c2"
-dependencies = [
- "libc",
-]
-
-[[package]]
-name = "termwiz"
-version = "0.9.0"
-dependencies = [
- "anyhow",
- "base64 0.10.1",
- "bitflags",
- "cassowary",
- "filedescriptor",
- "fnv",
- "lazy_static",
- "libc",
- "log",
- "memmem",
- "num-derive",
- "num-traits",
- "ordered-float",
- "regex",
- "semver",
- "signal-hook",
- "smallvec 0.6.13",
- "terminfo",
- "termios",
- "unicode-segmentation",
- "unicode-width",
- "vtparse",
- "winapi",
- "xi-unicode",
-]
-
-[[package]]
-name = "thread_local"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
-dependencies = [
- "lazy_static",
-]
-
 [[package]]
 name = "unicode-segmentation"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e83e153d1053cbb5a118eeff7fd5be06ed99153f00dbcd8ae310c5fb2b22edc0"
 
-[[package]]
-name = "unicode-width"
-version = "0.1.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "caaa9d531767d1ff2150b9332433f32a24622147e5ebb1f26409d5da67afd479"
-
-[[package]]
-name = "unicode-xid"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
-
 [[package]]
 name = "unicode-xid"
 version = "0.2.0"
@@ -678,29 +670,29 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "05e42f7c18b8f902290b009cde6d651262f956c98bc51bca4cd1d511c9cd85c7"
 
 [[package]]
-name = "utf8parse"
-version = "0.1.1"
+name = "void"
+version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8772a4ccbb4e89959023bc5b7cb8623a795caa7092d99f3aa9501b9484d4557d"
+checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
 
 [[package]]
-name = "version_check"
-version = "0.9.1"
+name = "wepoll-binding"
+version = "2.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "078775d0255232fb988e6fccf26ddc9d1ac274299aaedcedce21c6f72cc533ce"
-
-[[package]]
-name = "vtparse"
-version = "0.2.2"
+checksum = "374fff4ff9701ff8b6ad0d14bacd3156c44063632d8c136186ff5967d48999a7"
 dependencies = [
- "utf8parse",
+ "bitflags",
+ "wepoll-sys",
 ]
 
 [[package]]
-name = "wasi"
-version = "0.9.0+wasi-snapshot-preview1"
+name = "wepoll-sys"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
+checksum = "9082a777aed991f6769e2b654aa0cb29f1c3d615daf009829b07b66c7aff6a24"
+dependencies = [
+ "cc",
+]
 
 [[package]]
 name = "winapi"
@@ -723,9 +715,3 @@ name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
-
-[[package]]
-name = "xi-unicode"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7395cdb9d0a6219fa0ea77d08c946adf9c1984c72fcd443ace30365f3daadef7"
diff --git a/helix-core/src/state.rs b/helix-core/src/state.rs
index b4a3f2f0..22de6ca7 100644
--- a/helix-core/src/state.rs
+++ b/helix-core/src/state.rs
@@ -18,7 +18,11 @@ impl State {
 
     // TODO: buf/selection accessors
 
-    // update/transact
+    // update/transact:
+    // update(desc) => transaction ?  transaction.doc() for applied doc
+    // transaction.apply(doc)
+    // doc.transact(fn -> ... end)
+
     // replaceSelection (transaction that replaces selection)
     // changeByRange
     // changes
diff --git a/helix-core/src/transaction.rs b/helix-core/src/transaction.rs
index 8da01c09..f3bb40fa 100644
--- a/helix-core/src/transaction.rs
+++ b/helix-core/src/transaction.rs
@@ -1,19 +1,3 @@
-// pub struct Change {
-//     from: usize,
-//     to: usize,
-//     insert: Option<String>,
-// }
-
-// 40 bytes (8 + 24 + 8) -> strings are really big 24 as String, 16 as &str
-// pub struct Change {
-//     /// old extent
-//     old_extent: usize,
-//     /// inserted text, new extent equal to insert length
-//     insert: Option<String>,
-//     /// distance from the previous change
-//     distance: usize,
-// }
-
 use crate::{Buffer, Rope, Selection, Tendril};
 
 // TODO: divided into three different operations, I sort of like having just
@@ -33,11 +17,11 @@ pub enum Change {
     Insert(Tendril),
 }
 
-impl Change {
-    pub fn new(from: usize, to: usize, insert: Option<Tendril>) {
-        // old_extent, new_extent, insert
-    }
-}
+// impl Change {
+//     pub fn new(from: usize, to: usize, insert: Option<Tendril>) {
+//         // old_extent, new_extent, insert
+//     }
+// }
 
 #[derive(Copy, Clone, PartialEq, Eq)]
 pub enum Assoc {
@@ -46,13 +30,8 @@ pub enum Assoc {
 }
 
 // ChangeSpec = Change | ChangeSet | Vec<Change>
-// ChangeDesc as a ChangeSet without text: can't be applied, cheaper to store.
-// ChangeSet = ChangeDesc with Text
 #[derive(Debug)]
 pub struct ChangeSet {
-    // basically Vec<ChangeDesc> where ChangeDesc = (current len, replacement len?)
-    // (0, n>0) for insertion, (n>0, 0) for deletion, (>0, >0) for replacement
-    // sections: Vec<(usize, isize)>,
     changes: Vec<Change>,
     /// The required document length. Will refuse to apply changes unless it matches.
     len: usize,
@@ -341,6 +320,8 @@ pub struct Transaction {
     // scroll_into_view
 }
 
+impl Transaction {}
+
 #[cfg(test)]
 mod test {
     use super::*;
diff --git a/helix-term/Cargo.toml b/helix-term/Cargo.toml
index ea4d5b55..0ab6209e 100644
--- a/helix-term/Cargo.toml
+++ b/helix-term/Cargo.toml
@@ -10,13 +10,22 @@ edition = "2018"
 name = "hx"
 path = "src/main.rs"
 
-# [[bin]]
-# name = "line"
-# path = "src/line.rs"
+[[bin]]
+name = "line"
+path = "src/line.rs"
 
 [dependencies]
 # termwiz = { git = "https://github.com/wez/wezterm", features = ["widgets"] }
-termwiz = { path = "../../wezterm/termwiz", default-features = false, features = ["widgets"] }
+# termwiz = { path = "../../wezterm/termwiz", default-features = false, features = ["widgets"] }
+
 anyhow = "1.0.31"
 argh = "0.1.3"
 helix-core = { path = "../helix-core" }
+# crossterm = { version = "0.17.5", features = ["event-stream"] }
+crossterm = { git = "https://github.com/crossterm-rs/crossterm", branch = "mio-update", features = ["event-stream"] }
+
+futures = { version = "0.3.5", default-features = false, features = ["std"] }
+# futures-timer = "3.0.2"
+smol = "0.1.10"
+num_cpus = "1.13.0"
+piper = "0.1.2"
diff --git a/helix-term/src/line.rs b/helix-term/src/line.rs
index 90fb5e6f..58d4c9d8 100644
--- a/helix-term/src/line.rs
+++ b/helix-term/src/line.rs
@@ -1,111 +1,97 @@
-use termwiz::cell::AttributeChange;
-use termwiz::color::{AnsiColor, ColorAttribute, RgbColor};
-use termwiz::lineedit::*;
+//! Demonstrates how to read events asynchronously with async-std.
+//!
+//! cargo run --features="event-stream" --example event-stream-async-std
 
-#[derive(Default)]
-struct Host {
-    history: BasicHistory,
-}
+use std::{
+    io::{stdout, Write},
+    time::Duration,
+};
 
-impl LineEditorHost for Host {
-    // Render the prompt with a darkslateblue background color if
-    // the terminal supports true color, otherwise render it with
-    // a navy blue ansi color.
-    fn render_prompt(&self, prompt: &str) -> Vec<OutputElement> {
-        vec![
-            OutputElement::Attribute(AttributeChange::Background(
-                ColorAttribute::TrueColorWithPaletteFallback(
-                    RgbColor::from_named("darkslateblue").unwrap(),
-                    AnsiColor::Navy.into(),
-                ),
-            )),
-            OutputElement::Text(prompt.to_owned()),
-        ]
-    }
+use futures::{future::FutureExt, select, StreamExt};
+use smol::Timer;
+// use futures_timer::Delay;
 
-    fn history(&mut self) -> &mut dyn History {
-        &mut self.history
-    }
+use crossterm::{
+    cursor::position,
+    event::{DisableMouseCapture, EnableMouseCapture, Event, EventStream, KeyCode},
+    execute,
+    terminal::{disable_raw_mode, enable_raw_mode},
+    Result,
+};
 
-    /// Demo of the completion API for words starting with "h" or "he"
-    fn complete(&self, line: &str, cursor_position: usize) -> Vec<CompletionCandidate> {
-        let mut candidates = vec![];
-        if let Some((range, word)) = word_at_cursor(line, cursor_position) {
-            let words = &["hello", "help", "he-man"];
+const HELP: &str = r#"EventStream based on futures::Stream with async-std
+ - Keyboard, mouse and terminal resize events enabled
+ - Prints "." every second if there's no event
+ - Hit "c" to print current cursor position
+ - Use Esc to quit
+"#;
 
-            for w in words {
-                if w.starts_with(word) {
-                    candidates.push(CompletionCandidate {
-                        range: range.clone(),
-                        text: w.to_string(),
-                    });
+async fn print_events() {
+    let mut reader = EventStream::new();
+
+    loop {
+        let mut delay = Timer::after(Duration::from_millis(1_000)).fuse();
+        let mut event = reader.next().fuse();
+
+        select! {
+            _ = delay => { println!(".\r"); },
+            maybe_event = event => {
+                match maybe_event {
+                    Some(Ok(event)) => {
+                        println!("Event::{:?}\r", event);
+
+                        if event == Event::Key(KeyCode::Char('c').into()) {
+                            println!("Cursor position: {:?}\r", position());
+                        }
+
+                        if event == Event::Key(KeyCode::Esc.into()) {
+                            break;
+                        }
+                    }
+                    Some(Err(e)) => println!("Error: {:?}\r", e),
+                    None => break,
                 }
             }
-        }
-        candidates
+        };
     }
 }
 
-/// This is a conceptually simple function that computes the bounds
-/// of the whitespace delimited word at the specified cursor position
-/// in the supplied line string.
-/// It returns the range and the corresponding slice out of the line.
-/// This function is sufficient for example purposes; in a real application
-/// the equivalent function would need to be aware of quoting and other
-/// application specific context.
-fn word_at_cursor(line: &str, cursor_position: usize) -> Option<(std::ops::Range<usize>, &str)> {
-    let char_indices: Vec<(usize, char)> = line.char_indices().collect();
-    if char_indices.is_empty() {
-        return None;
-    }
-    let char_position = char_indices
-        .iter()
-        .position(|(idx, _)| *idx == cursor_position)
-        .unwrap_or(char_indices.len());
+fn main() -> Result<()> {
+    println!("{}", HELP);
 
-    // Look back until we find whitespace
-    let mut start_position = char_position;
-    while start_position > 0
-        && start_position <= char_indices.len()
-        && !char_indices[start_position - 1].1.is_whitespace()
-    {
-        start_position -= 1;
+    enable_raw_mode()?;
+
+    let mut stdout = stdout();
+    execute!(stdout, EnableMouseCapture)?;
+
+    use std::thread;
+
+    // Same number of threads as there are CPU cores.
+    let num_threads = num_cpus::get().max(1);
+
+    // A channel that sends the shutdown signal.
+    let (s, r) = piper::chan::<()>(0);
+    let mut threads = Vec::new();
+
+    // Create an executor thread pool.
+    for _ in 0..num_threads {
+        // Spawn an executor thread that waits for the shutdown signal.
+        let r = r.clone();
+        threads.push(thread::spawn(move || smol::run(r.recv())));
     }
 
-    // Look forwards until we find whitespace
-    let mut end_position = char_position;
-    while end_position < char_indices.len() && !char_indices[end_position].1.is_whitespace() {
-        end_position += 1;
+    // No need to `run()`, now we can just block on the main future.
+    smol::block_on(print_events());
+
+    // Send a shutdown signal.
+    drop(s);
+
+    // Wait for threads to finish.
+    for t in threads {
+        t.join().unwrap();
     }
 
-    if end_position > start_position {
-        let range = char_indices[start_position].0
-            ..char_indices
-                .get(end_position)
-                .map(|c| c.0 + 1)
-                .unwrap_or(line.len());
-        Some((range.clone(), &line[range]))
-    } else {
-        None
-    }
-}
-
-fn main() -> anyhow::Result<()> {
-    println!("Type `exit` to quit this example, or start a word with `h` and press Tab.");
-    let mut terminal = line_editor_terminal()?;
-    let mut editor = LineEditor::new(&mut terminal);
-
-    let mut host = Host::default();
-    loop {
-        if let Some(line) = editor.read_line(&mut host)? {
-            println!("read line: {:?}", line);
-            if line == "exit" {
-                break;
-            }
-
-            host.history().add(&line);
-        }
-    }
-
-    Ok(())
+    execute!(stdout, DisableMouseCapture)?;
+
+    disable_raw_mode()
 }
diff --git a/helix-term/src/main.rs b/helix-term/src/main.rs
index 9dfa3767..aaa83a86 100644
--- a/helix-term/src/main.rs
+++ b/helix-term/src/main.rs
@@ -1,6 +1,6 @@
-mod editor;
+// mod editor;
 
-use editor::Editor;
+// use editor::Editor;
 
 use argh::FromArgs;
 use std::{env, path::PathBuf};
@@ -16,9 +16,9 @@ pub struct Args {
 
 fn main() -> Result<(), Error> {
     let args: Args = argh::from_env();
-    let mut editor = Editor::new(args)?;
+    // let mut editor = Editor::new(args)?;
 
-    editor.run()?;
+    // editor.run()?;
 
     Ok(())
 }