Document situation to be signaled

Lame formatters cannot distinguish between when there are syntax errors and
when code should be reformatted.

CUSTOMIZATION.md

@@ -40,19 +40,19 @@ exit 0
 [here](./examples/custom-sniffer).)
 
 Now, if you run this script against a file that ends in `.pl` or `.ts`,
-`would-reformat` will not treat the file as perl or typescript as usual, but
-instead as prolog or a qt-translation file.  But if you run this script
-against a file that ends in `.py` then it'll continue to be treated as python
-as usual.
+`would-reformat` will not treat the file as perl or typescript, which is what
+happens by default, but instead as prolog or a qt-translation file.  But if
+you run this script against a file that ends in `.py` then it'll continue to
+be treated as python as usual.
 
 You can perform arbitrarily sophisticated checks here.  They're not limited to
 file names or extensions.  You can take paths into account.  You can can even
 take files' contents into account.  But do keep in mind that this program
 will be run often.  If it's slow you'll be frustrated by it.
 
-Don't forget that this program can be written in something other than shell,
-in case that's easier for you or if performance is a serious concern.  It
-doesn't actually need to be a "script".
+This program can be written in something other than shell.  This might make
+implementation easier, and it might be worthwhile if performance is a serious
+concern.  It doesn't actually need to be a "script".
 
 Finally, keep in mind that if `would-reformat`'s defaults work for you, there
 is no need to have this file at all.
@@ -67,7 +67,8 @@ include the `/` character.  `would-reformat` doesn't care if you use
 uppercase, but some case-preserving filesystems make things difficult.
 
 It must not output `custom-sniffer`.  If there is a hitherto unknown
-programming language named "custom sniffer" you'll have to output something else.
+programming language named "custom sniffer" you'll have to output something
+else.
 
 ## Return values
 
@@ -158,6 +159,8 @@ As output, this script should emit whatever the programs it calls emit.
 - 0: file wouldn't be reformatted
 - 1: file would be reformatted
 - 2: file has at least one syntax error
+- 3: file would be reformatted or it has at least one syntax error but we
+  cannot distinguish which
 - 252: Unexpected return value from the tool; that is, the value of `$?` is
   unexpected and thus unhandled
 - 253: Unexpected output from the tool; that is, the output emitted by the
@@ -168,15 +171,15 @@ As output, this script should emit whatever the programs it calls emit.
 - 255: error internal to the script in question
 
 (FIXME: Unsurprisingly, `gofmt` is the only tool I've tested so far that gets
-this right.  That a file should be reformatted isn't an exceptional condition,
-so there's no good reason to signal failure here.
+this right.  It isn't an exceptional condition when a file should be
+reformatted, so there's no good reason to signal failure here.
 
 Even less unsurprisingly, Laravel pint gets it worse than all the others I
-checked; it doesn't distinguish misformatted files from files with actual
-syntax errors.
+checked; it doesn't distinguish files that need to be reformatted from files
+with actual syntax errors.
 
-Anyway, `gofmt` is the obviously the model to follow.  So we should
-probably drop `1`.)
+If possible, then, we should return 1 or 2 when relevant.  When they can't be
+distinguished, return 3.)
 
 
 ### in `do_format` mode

DEVELOPMENT.md

@@ -8,8 +8,8 @@ following tools installed:
 - [shfmt](https://github.com/mvdan/sh)
 
 In general, code should pass shellcheck without warnings, be formatted with
-shfmt (please use it with `-i 4`), and come with new tests and pass them when
-relevant.
+shfmt (please use it with `-i 4`), and when relevant come with new tests and
+pass them.
 
 If any of this causes you trouble, don't worry.  Please submit your pull
 request anyway and we can work on getting it up to snuff.
@@ -24,11 +24,13 @@ request anyway and we can work on getting it up to snuff.
 - Be easy to configure.
 - Be clearly documented.  Remember that many programmers are working in
   high-stress situations.  Documentation that is incomplete, unclear, or cute
-  will make things even worse for them.  Use English correctly and, to the
-  extent possible, unambiguously.
+  makes things even worse for them.  Use English correctly and, to the extent
+  possible, unambiguously.
 
 ## Non-goals
 
+- We don't want to do anything with warnings etc that aren't specifically
+  formatting-related
 
 # Wishlist
 
@@ -45,13 +47,17 @@ request anyway and we can work on getting it up to snuff.
   probably be more confusing than helpful but I'm not wedded to this
   conclusion.
 - Write a doctor command to identify potential issues (you'd probably run it
-  similarly to how you run the install script, but `s/install/doctor`).
+  similarly to how you run the install script, but `s/install/doctor/`).
+- Create a nix setup that includes all the tools as fallbacks
+- Cache file type sniffing results?  How?
 
 # Problems
 
 - It would probably be better if we wrote reformatted code to temp files and
   atomically renamed them.  This might mean that the tool-specific programs
-  should emit diffs rather than working silently as they currently do.
+  should emit diffs rather than working silently as they currently do.  The
+  rationale is that this makes it a lot easier to atomically apply two or more
+  fixers.
 - It probably doesn't work on Windows as-is.
 - There are probably some Linuxisms and maybe even some recentbashisms.
 - It doesn't work with tramp.

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2020, 2021, 2022, 2023 Michael Wolf
+Copyright (c) 2020, 2021, 2022, 2023, 2024 Michael Wolf
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

NEW-FORMATTERS.md

@@ -0,0 +1,91 @@
+## available environment variables
+
+- `PROJECT_ROOT` is the root directory of your project, the one
+  with files that need to be reformatted.  Currently (as of 2023-09) this is
+  just the output of `git rev-parse --show-toplevel` but it may be improved.
+- `WF_ROOT` is the root directory of the `would-format` checkout
+
+file checking and sniffing
+
+## file type sniffing
+
+You can override a file type by creating an executable in
+`$WOULD_FORMAT_PROJECT_ROOT/.would-format/sniffer`.  This is typically a shell
+script, but it doesn't have to be.  It takes one argument, the full path of
+the file to be checked.
+
+This file should print the type of file it should be treated as.  If the
+script has no opinion on the matter, it should print nothing and exit.  Here
+is an example:
+
+```shell-script
+#!/usr/bin/env bash
+
+file="$1"
+
+if [[ $file == *.pl ]] ; then
+    # the default is that .pl corresponds to perl, but not here!
+    echo -n "prolog"
+fi
+
+if [[ $file == *.ts ]] ; then
+    # qt translations, who knew
+    echo -n "qt-translation"
+fi
+
+# We're fine with the defaults for other types of files so we don't
+# print anything else.
+
+exit 0
+```
+
+Return values:
+
+- 0: success
+- 254: file can't be read due to permissions, etc ("etc" is as of
+  2023-Q3 broad in scope; it could include trying and failing to read a file
+  on a NFS mount)
+- 255: some sort of internal error
+
+
+
+
+## return value normalization for formatters
+
+In general, low-numbered codes are related to the code to be analyzed
+or reformatted and high-numbered codes have to do with problems with these
+scripts themselves.
+
+### In `would_format` mode
+
+`would-format.sh` interprets return values to mean the following:
+
+FIXME: Unsurprisingly, `gofmt` gets this right, even if none of the other
+tools does.  Drop `1`.
+
+- 0: file wouldn't be reformatted
+- 1: file would be reformatted
+- 2: file has at least one syntax error
+- 3: file would be reformatted or it has at least one syntax error but we
+  cannot distinguish which
+- 252: Unexpected return value from the tool; that is, the value of `$?` is
+  unexpected and thus unhandled
+- 253: Unexpected output from the tool; that is, the output emitted by the
+  tool is unexpected and thus unhandled
+- 254: file can't be read due to permissions, etc ("etc" is as of
+  2023-Q3 broad in scope; it could include trying and failing to read a file
+  on a NFS mount)
+- 255: error internal to the script in question
+
+
+# in `do_format` mode
+
+`do-format.sh` interprets return values to mean the following:
+
+- 0: file was successfully reformatted
+- 1: file was not successfully reformatted, presumably due to a syntax error
+- 254: file can't be rewritten due to permissions, etc ("etc" is as of
+  2023-Q3 broad in scope; it could include trying and failing to read a file
+  on a NFS mount)
+- 255: error internal to the script in question
+

README.md

@@ -1,4 +1,4 @@
-would-reformat - automatic reformatting for emacs without being annoying
+would-reformat - automatic reformatting for emacs (and maybe other editors) without being annoying
 
 # Motivation
 
@@ -38,9 +38,13 @@ saving a file and to run `do-reformat.sh` when you hit `<F1>`.
 - typescript
 - vue
 
-Out of the box, python uses `isort` and `black`, go uses `gofmt`, and dart
-uses `dart format`.  The rest use `prettier`.  Adding new programming
-languages is easy, assuming they have a formatter with a dry run mode.
+Out of the box, for python we use `isort` and `black`, for go we use `gofmt`,
+for dart we use `dart format`, for rust we use `rustfmt`, and for everything
+else we use `prettier`.
+
+Adding suuport for other programming languages is easy, assuming they have a
+formatter with a dry run mode.  And even if they don't it shouldn't be that
+bad.
 
 # Installation
 

_reformat-common.bash

@@ -1,3 +1,11 @@
+function log () {
+    msg=$@
+    
+    if [[ ! -z "${LOG_TO+}" ]]  ; then
+        echo "$msg" >> $LOG_TO
+    fi
+}
+
 function get_os() {
     un=$(uname)
 
@@ -139,14 +147,17 @@ function sniff_file_type() {
         file_type="css"
     elif [[ $ff == *.scss ]]; then
         file_type="scss"
-    elif [[ $ff = *.sh ]]; then
-        file_type="sh"
     elif [[ $ff = *.go ]]; then
         file_type="golang"
     elif [[ $ff = *.dart ]]; then       
         file_type="dart"
+    elif [[ $ff = *.sh ]]; then
+        # .sh isn't enough; we'll need other extns
+        file_type="shell"
     elif [[ $ff = *.pl ]]; then
         file_type="perl"
+    elif [[ $ff = *.rs ]] ; then
+        file_type="rust"
     fi
 
     echo $file_type
@@ -184,15 +195,18 @@ function choose_wrapper() {
         $file_type = "jsx" ||
         $file_type = "tsx" ||
         $file_type == "css" ||
-        $file_type == "scss" ||
-        $file_type = "sh" ]]; then
+        $file_type == "scss" ]]; then
         out="$WF_ROOT"/./prettier.sh
     elif [[ $file_type == "python" ]]; then
         out="$WF_ROOT"/./isort-and-black.sh
     elif [[ $file_type == "golang" ]]; then
         out="$WF_ROOT"/./gofmt.sh
+    elif [[ $file_type == "rust" ]] ; then
+        out="$WF_ROOT"/./rustfmt.sh
     elif [[ $file_type == "dart" ]]; then
         out="$WF_ROOT"/./dart_format.sh
+    elif [[ $file_type == "shell" ]] ; then
+        out="$WF_ROOT"/./shfmt.sh
     else
         out="$WF_ROOT"/./default.sh
     fi

dart_format.sh

@@ -30,6 +30,7 @@ if [[ "$WOULD_REFORMAT" = "would_reformat" ]]; then
 fi
 
 if [[ "$WOULD_REFORMAT" = "do_reformat" ]]; then
+    # FIXME this is obviously obviously obviously wrong
     out=$(npx prettier --write "$file" 2>&1 >/dev/null)
     retval="$?"
 

do-reformat.sh

@@ -7,6 +7,8 @@ DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 source "$DIR/_reformat-common.bash"
 
+#export LOG_DEST="$LOG_TO"
+
 file="$1"
 
 PROJECT_ROOT=$(project_root "$file")

gofmt.sh

@@ -37,7 +37,7 @@ if [[ "$WOULD_REFORMAT" = "would_reformat" ]]; then
 fi
 
 if [[ "$WOULD_REFORMAT" = "do_reformat" ]]; then
-    out=$(npx prettier --write "$file" 2>&1 >/dev/null)
+    out=$(gofmt -w "$file" 2>&1 >/dev/null)
     retval="$?"
 
     echo "$out"

rustfmt.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+set -uo pipefail
+IFS=$'\n\t'
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+source "$DIR/_reformat-common.bash"
+
+log "in rustfmt.sh"
+
+set -e
+
+file="$1"
+
+log what
+
+pushd "$(dirname "$file")" 2>&1
+
+if [[ "$WOULD_REFORMAT" = "would_reformat" ]]; then
+
+log beavis
+
+    set +e
+    out=$(rustfmt --check "$file" 2>&1 >/dev/null)
+    retval="$?"
+    set -e
+
+log got back retval $retval
+
+    exit "$retval"
+fi
+
+if [[ "$WOULD_REFORMAT" = "do_reformat" ]]; then
+
+log in do reformat mode
+
+    out=$(rustfmt "$file" 2>&1 >/dev/null)
+    retval="$?"
+
+    echo "$out"
+
+log $out
+
+    exit "$retval"
+fi
+
+log are we here now
+
+exit 255

shfmt.sh

@@ -0,0 +1,39 @@
+set -uo pipefail
+IFS=$'\n\t'
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+source "$DIR/_reformat-common.bash"
+
+set -e
+
+file="$1"
+
+pushd "$(dirname "$file")" 2>&1
+
+if [[ "$WOULD_REFORMAT" = "would_reformat" ]]; then
+    # probably others too :(
+    syntax_error_retval=1
+
+    set +e
+    out=$(dart format -o none --set-exit-if-changed "$file"
+    retval="$?"
+    set -e
+
+    if [[ "$retval" = "$syntax_error_retval" ]]; then
+        retval=2
+    fi
+
+    exit "$retval"
+fi
+
+if [[ "$WOULD_REFORMAT" = "do_reformat" ]]; then
+    out=$(shfmt -w "$file" 2>&1 > /dev/null)
+    retval="$?"
+
+    echo "$out"
+    exit "$retval"
+fi
+
+exit 255
+

would-reformat.sh

@@ -10,6 +10,12 @@ DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 # wrflog before sourcing common funcs, I think i am in dir: $(pwd)
 source "$DIR/_reformat-common.bash"
 
+#export LOG_DEST="$LOG_TO"
+
+log "is this thing on"
+
+log i think it is on
+
 file="$1"
 PROJECT_ROOT=$(project_root "$file")
 export PROJECT_ROOT="$PROJECT_ROOT"
@@ -24,11 +30,19 @@ export WOULD_REFORMAT=would_reformat
 
 wrapper=$(choose_wrapper "$file_type")
 
+log wrapper is "$wrapper"
+
 set +e
+echo asdf
 out=$("$wrapper" "$file" 2>&1 >/dev/null)
 retval="$?"
+echo fdsa
+
 set -e
 
+
+echo retval "$retval"
+
 success_retval=0
 would_reformat_retval=1
 syntax_error_retval=2