ADR for unified approach for CLI arguments for Hermes

docs/architecture/adr-010-unified-cli-arguments-hermes.md

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+# ADR 010: Unified approach for CLI arguments for Hermes v1.0.0
+
+## Changelog
+* 15.06.2022: Proposed.
+
+## Context
+
+In this ADR we provide recommendations and intuitions to using flags for all the arguments of the Hermes commands.
+
+The problem we are trying to solve is a unified approach to CLI arguments for Hermes v1.0.0.
+
+## Decision
+
+To avoid confusion, all the parameters should take long flags. The following general scenarios should be applied:
+
+* Only long flags are used in order to avoid having nonintuitive flags or conflicting flags.
+* Any parameter ending with `_id` should have the `_id` removed from the flag to shorten it. For example the flag for `chain_id` should only be `chain`.
+* Flags which can be shorten and still be meaningful should be shorten. This is done for `connection`, `channel` and `sequence`, which become respectively `conn`, `chan` and `seq`.
+* For the channel and connection creation CLIs, the objects at the two ends are suffixed by `-a` and `-b`.
+* All the specifiers for `chain`, `connection`, `channel` and `port` flags are suffixed. These specifiers are `host`, `reference`, `a`, `b` and `counterparty`.
+
+The following commands are implemented, with the binary name `hermes` omitted:
+
+### Hermes global flags
+
+* `hermes --config <CONFIG> <COMMAND>`
+
+* `hermes --json <COMMAND>`
+
+### Commands for clients
+
+* `create client --chain-host <CHAIN_HOST_ID> --chain-reference <CHAIN_REFERENCE_ID>`
+    * Optional: `[--clock-drift <CLOCK_DRIFT>] [--trust-threshold <TRUST_THRESHOLD>] [--trusting-period <TRUSTING_PERDIOD>]`
+
+* `update client --chain-host <CHAIN_HOST_ID> --client-host <CLIENT_HOST_ID>`
+    * Optional: `[--height <REFERENCE_HEIGHT>] [--trusted-height <REFERENCE_TRUSTED_HEIGHT>]`
+
+* `upgrade client --chain-host <CHAIN_HOST_ID> --client-host <CLIENT_HOST_ID>`
+
+* `upgrade clients --chain-reference <CHAIN_REFERENCE_ID>`
+    * Optional: `[--chain-host <CHAIN_HOST_ID>]` (**Not implemented**)
+
+### Create a connection
+
+* `create connection --chain-a <CHAIN_A_ID> --chain-b <CHAIN_B_ID>`
+    * Optional: `[--delay <DELAY>]`
+
+* `create connection --chain-a <CHAIN_A_ID> --client-a <CLIENT_A_ID> --client-b <CLIENT_B_ID>`
+    * Optional: `[--delay <DELAY>]`
+
+### Create a channel
+
+* `create channel --chain-a <CHAIN_A_ID> --chain-b <CHAIN_B_ID> --port-a <PORT_A_ID> --port-b <PORT_B_ID>`
+    * Optional: `[--chan-version <VERSION>] [--new-client-conn] [--order <ORDER>]`
+
+* `create channel --chain-a <CHAIN_A_ID> --conn-a <CONNECTION_A_ID> --port-a <PORT_A_ID> --port-b <PORT_B_ID>`
+    * Optional: `[--chan-version <VERSION>] [--order <ORDER>]`
+
+### Commands for keys
+
+* `keys add --chain <CHAIN_ID> --key-file <KEY_FILE> --mnemonic-file <MNEMONIC_FILE>`
+    * Optional: `[--hd-path <HD_PATH>] [--key-name <KEY_NAME>]`
+
+* `keys balance --chain <CHAIN_ID>`
+    * Optional: `[--key-name <KEY_NAME>]`
+
+* `keys delete --chain <CHAIN_ID> --all`
+
+* `keys delete --chain <CHAIN_ID> --key-name <KEY_NAME>`
+
+* `keys list --chain <CHAIN_ID>`
+
+### Listen
+
+* `listen --chain <CHAIN_ID>`
+    * Optional: `[--event <EVENT>]`
+
+### Misbehaviour
+
+* `misbehaviour --chain <CHAIN_ID> --client <CLIENT_ID>`
+
+### Start the relayer in multi-chain mode
+
+* `start`
+    * Optional: `[--full-scan]`
+
+### Clear objects
+
+* `clear packets --chain <CHAIN_ID> --port <PORT_ID> --chan <CHANNEL_ID>`
+
+### Queries
+
+__Client__
+
+* `query client connections --chain <CHAIN_ID> --client <CLIENT_ID>`
+    * Optional: `[--height <HEIGHT>]`
+
+* `query client consensus --chain <CHAIN_ID> --client <CLIENT_ID>`
+    * Optional: `[--consensus-height <CONSENSUS_HEIGHT>] [--height <HEIGHT>] [--heights-only]`
+
+* `query client header --chain <CHAIN_ID> --client <CLIENT_ID> --consensus-height <CONSENSUS_HEIGHT>`
+    * Optional: `[--height <HEIGHT>]`
+
+* `query client state --chain <CHAIN_ID> --client <CLIENT_ID>`
+    * Optional: `[--height <HEIGHT>]`
+
+* `query clients --chain-host <CHAIN_HOST_ID>`
+    * Optional: `[--omit-chain-ids] [--chain-reference <CHAIN_REFERENCE_ID>]`
+
+__Connection__
+
+* `query connection channels --chain <CHAIN_ID> --conn <CONNECTION_ID>`
+
+* `query connection end --chain <CHAIN_ID> --conn <CONNECTION_ID>`
+    * Optional: `[--height <HEIGHT>]`
+
+* `query connections --chain <CHAIN_ID>`
+    * Optional: `[--chain-counterparty <CHAIN_COUNTERPARTY_ID>] [--verbose]` (**Not implemented**)
+
+__Channel__
+
+* `query channel client --chain <CHAIN_ID> --port <PORT_ID> --chan <CHANNEL_ID>`
+
+* `query channel end --chain <CHAIN_ID> --port <PORT_ID> --chan <CHANNEL_ID>`
+    * Optional: `[--height <HEIGHT>]`
+
+* `query channel ends --chain <CHAIN_ID> --port <PORT_ID> --chan <CHANNEL_ID>`
+    * Optional: `[--height <HEIGHT>] [--verbose]`
+
+* `query channels --chain <CHAIN_ID>`
+    * Optional: `[--chain-counterparty <CHAIN_COUNTERPARTY_ID>] [--verbose]`
+
+__Packet__
+
+* `query packet ack --chain <CHAIN_ID> --port <PORT_ID> --chan <CHANNEL_ID> --seq <SEQUENCE>`
+    * Optional: `[--height <HEIGHT>]`
+
+* `query packet acks --chain <CHAIN_ID> --port <PORT_ID> --chan <CHANNEL_ID>`
+
+* `query packet commitment --chain <CHAIN_ID> --port <PORT_ID> --chan <CHANNEL_ID> --seq <SEQUENCE>`
+    * Optional: `[--height <HEIGHT>]`
+
+* `query packet commitments --chain <CHAIN_ID> --port <PORT_ID> --chan <CHANNEL_ID>`
+
+* `query packet pending --chain <CHAIN_ID> --port <PORT_ID> --chan <CHANNEL_ID>`
+
+* `query packet unreceived-acks --chain <CHAIN_ID> --port <PORT_ID> --chan <CHANNEL_ID>`
+
+* `query packet unreceived-packets --chain <CHAIN_ID> --port <PORT_ID> --chan <CHANNEL_ID>`
+
+__Tx__
+
+* `query tx events --chain <CHAIN_ID> --hash <HASH>`
+
+### Shell completion
+
+* `completions --shell <SHELL>`
+
+### Validate configuration file
+
+* `config validate`
+
+### Health check
+
+* `health-check`
+