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Merge pull request #239 from cdepillabout/split-win-module
Move defaultMain and startWithCliArgs to Termonad.Startup module
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| -- | Description : Functions for starting up Termonad. | ||
| -- Copyright : (c) Dennis Gosnell, 2023 | ||
| -- License : BSD3 | ||
| -- Stability : experimental | ||
| -- Portability : POSIX | ||
| -- | ||
| -- This module contains functions for starting up Termonad. | ||
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| module Termonad.Startup where | ||
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| import Termonad.Prelude | ||
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| import Config.Dyre (wrapMain, newParams) | ||
| import Control.Lens (over) | ||
| import System.IO.Error (doesNotExistErrorType, ioeGetErrorType, ioeGetFileName, tryIOError) | ||
| import Termonad.App (start) | ||
| import Termonad.Cli (parseCliArgs, applyCliArgs) | ||
| import Termonad.Lenses (lensOptions) | ||
| import Termonad.Types (TMConfig) | ||
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| -- | Run Termonad with the given 'TMConfig'. | ||
| -- | ||
| -- Do not perform any of the recompilation operations that the 'defaultMain' | ||
| -- function does. | ||
| -- | ||
| -- This function __does__ parse command line arguments, and then calls 'Termonad.App.start'. | ||
| startWithCliArgs :: TMConfig -> IO () | ||
| startWithCliArgs tmConfig = do | ||
| cliArgs <- parseCliArgs | ||
| start (over lensOptions (applyCliArgs cliArgs) tmConfig) | ||
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| -- | Run Termonad with the given 'TMConfig'. | ||
| -- | ||
| -- This function will check if there is a @~\/.config\/termonad\/termonad.hs@ file | ||
| -- and a @~\/.cache\/termonad\/termonad-linux-x86_64@ binary. Termonad will | ||
| -- perform different actions based on whether or not these two files exist. | ||
| -- | ||
| -- Here are the four different possible actions based on the existence of these | ||
| -- two files. | ||
| -- | ||
| -- - @~\/.config\/termonad\/termonad.hs@ exists, @~\/.cache\/termonad\/termonad-linux-x86_64@ exists | ||
| -- | ||
| -- The timestamps of these two files are checked. If the | ||
| -- @~\/.config\/termonad\/termonad.hs@ file has been modified after the | ||
| -- @~\/.cache\/termonad\/termonad-linux-x86_64@ binary, then Termonad will use | ||
| -- GHC to recompile the @~\/.config\/termonad\/termonad.hs@ file, producing a | ||
| -- new binary at @~\/.cache\/termonad\/termonad-linux-x86_64@. This new binary | ||
| -- will be re-executed. The 'TMConfig' passed to this 'defaultMain' will be | ||
| -- effectively thrown away, however all command line options will be passed | ||
| -- on to this new Termonad process. | ||
| -- | ||
| -- If GHC fails to recompile the @~\/.config\/termonad\/termonad.hs@ file, then | ||
| -- Termonad will just execute 'startWithCliArgs' with the 'TMConfig' passed in. | ||
| -- | ||
| -- If the @~\/.cache\/termonad\/termonad-linux-x86_64@ binary has been modified | ||
| -- after the @~\/.config\/termonad\/termonad.hs@ file, then Termonad will | ||
| -- re-exec the @~\/.cache\/termonad\/termonad-linux-x86_64@ binary. The | ||
| -- 'TMConfig' passed to this 'defaultMain' will be effectively thrown away, | ||
| -- however all command line options will be passed on to this new Termonad | ||
| -- process. | ||
| -- | ||
| -- - @~\/.config\/termonad\/termonad.hs@ exists, @~\/.cache\/termonad\/termonad-linux-x86_64@ does not exist | ||
| -- | ||
| -- Termonad will use GHC to recompile the @~\/.config\/termonad\/termonad.hs@ | ||
| -- file, producing a new binary at @~\/.cache\/termonad\/termonad-linux-x86_64@. | ||
| -- This new binary will be re-executed. The 'TMConfig' passed to this | ||
| -- 'defaultMain' will be effectively thrown away, however all command line | ||
| -- options will be passed on to this new Termonad process. | ||
| -- | ||
| -- If GHC fails to recompile the @~\/.config\/termonad\/termonad.hs@ file, then | ||
| -- Termonad will just execute 'startWithCliArgs' with the 'TMConfig' passed in. | ||
| -- | ||
| -- - @~\/.config\/termonad\/termonad.hs@ does not exist, @~\/.cache\/termonad\/termonad-linux-x86_64@ exists | ||
| -- | ||
| -- Termonad will ignore the @~\/.cache\/termonad\/termonad-linux-x86_64@ binary | ||
| -- and just run 'startWithCliArgs' with the 'TMConfig' passed to this function. | ||
| -- | ||
| -- - @~\/.config\/termonad\/termonad.hs@ does not exist, @~\/.cache\/termonad\/termonad-linux-x86_64@ does not exist | ||
| -- | ||
| -- Termonad will run 'startWithCliArgs' with the 'TMConfig' passed to this function. | ||
| -- | ||
| -- Other notes: | ||
| -- | ||
| -- 1. That the locations of @~\/.config\/termonad\/termonad.hs@ and | ||
| -- @~\/.cache\/termonad\/termonad-linux-x86_64@ may differ depending on your | ||
| -- system. | ||
| -- | ||
| -- 2. In your own @~\/.config\/termonad\/termonad.hs@ file, you can use either | ||
| -- 'defaultMain' or 'startWithCliArgs'. As long as you always | ||
| -- execute the system-wide @termonad@ binary (instead of the binary produced | ||
| -- as @~\/.cache\/termonad\/termonad-linux-x86_64@), the effect should be | ||
| -- similar. | ||
| -- | ||
| -- 3. If you directly run the cached termonad binary (e.g. | ||
| -- @~\/.cache\/termonad\/termonad-linux-x86_64@) instead of the | ||
| -- system-installed Termonad binary (e.g. @\/usr\/bin\/termonad@), the Termonad | ||
| -- /will/ recompile the the configuration file | ||
| -- @~\/.config\/termonad\/termonad.hs@ according to the above logic (while | ||
| -- possibly overwriting the executable file for the binary you're currently | ||
| -- running), but it /will not/ re-exec into the newly built @termonad@ binary. | ||
| -- | ||
| -- 4. When running the system-wide @termonad@ binary, the initial 'TMConfig' | ||
| -- that gets passed into this function comes from | ||
| -- 'Termonad.PreferencesFile.tmConfigFromPreferencesFile'. As stated above, | ||
| -- this initial 'TMConfig' gets ignored if users have a | ||
| -- @~\/.config\/termonad\/termonad.hs@ file that gets recompiled and re-execed. | ||
| -- | ||
| -- End users generally call 'defaultMain' in their | ||
| -- @~\/.config\/termonad\/termonad.hs@ file. | ||
| -- | ||
| -- 'defaultMain' interally calls 'startWithCliArgs', which parses CLI arguments | ||
| -- and combines them with the passed-in 'TMConfig'. 'startWithCliArgs' then | ||
| -- internally calls 'Termonad.App.start'. | ||
| -- | ||
| -- If you don't want the re-compiling and re-exec functionality, you can directly | ||
| -- use 'startWithCliArgs'. If you also don't want the CLI argument parsing | ||
| -- functionality, you can directly use 'Termonad.App.start'. | ||
| defaultMain :: TMConfig -> IO () | ||
| defaultMain tmConfig = do | ||
| let params = newParams "termonad" realMainFunc collectErrs | ||
| eitherRes <- tryIOError $ wrapMain params (tmConfig, "") | ||
| case eitherRes of | ||
| Left ioErr | ||
| | ioeGetErrorType ioErr == doesNotExistErrorType && ioeGetFileName ioErr == Just "ghc" -> do | ||
| putStrLn $ | ||
| "Could not find ghc on your PATH. Ignoring your termonad.hs " <> | ||
| "configuration file and running termonad with default settings." | ||
| startWithCliArgs tmConfig | ||
| | otherwise -> do | ||
| putStrLn "IO error occurred when trying to run termonad:" | ||
| print ioErr | ||
| putStrLn "Don't know how to recover. Exiting." | ||
| Right _ -> pure () | ||
| where | ||
| -- The real main function | ||
| realMainFunc :: (TMConfig, String) -> IO () | ||
| realMainFunc (cfg, errs) = | ||
| case errs of | ||
| "" -> startWithCliArgs cfg | ||
| _ -> do | ||
| putStrLn $ "Errors from dyre when recompiling Termonad:" <> errs | ||
| putStrLn "Continuing with Termonad without re-execing into recompiled binary..." | ||
| startWithCliArgs cfg | ||
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| -- A function that can easily collect errors from dyre | ||
| collectErrs :: (TMConfig, String) -> String -> (TMConfig, String) | ||
| collectErrs (cfg, oldErrs) newErr = (cfg, oldErrs <> "\n" <> newErr) |
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