author | Mikael Berthe <mikael@lilotux.net> |
Sat, 04 Feb 2023 12:58:35 +0100 | |
changeset 265 | 05c40b36d3b2 |
permissions | -rw-r--r-- |
265
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#!/usr/bin/env zsh |
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[ "${ZSH_VERSION:-}" = "" ] && echo >&2 "Only works with zsh" && exit 1 |
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setopt err_exit no_unset pipefail extended_glob |
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# Simple script to update the godoc comments on all watchers. Probably took me |
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# more time to write this than doing it manually, but ah well 🙃 |
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watcher=$(<<EOF |
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// Watcher watches a set of paths, delivering events on a channel. |
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// |
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// A watcher should not be copied (e.g. pass it by pointer, rather than by |
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// value). |
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// |
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// # Linux notes |
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// |
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// When a file is removed a Remove event won't be emitted until all file |
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// descriptors are closed, and deletes will always emit a Chmod. For example: |
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// |
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// fp := os.Open("file") |
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// os.Remove("file") // Triggers Chmod |
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// fp.Close() // Triggers Remove |
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// |
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// This is the event that inotify sends, so not much can be changed about this. |
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// |
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// The fs.inotify.max_user_watches sysctl variable specifies the upper limit |
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// for the number of watches per user, and fs.inotify.max_user_instances |
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// specifies the maximum number of inotify instances per user. Every Watcher you |
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// create is an "instance", and every path you add is a "watch". |
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// |
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// These are also exposed in /proc as /proc/sys/fs/inotify/max_user_watches and |
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// /proc/sys/fs/inotify/max_user_instances |
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// |
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// To increase them you can use sysctl or write the value to the /proc file: |
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// |
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// # Default values on Linux 5.18 |
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// sysctl fs.inotify.max_user_watches=124983 |
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// sysctl fs.inotify.max_user_instances=128 |
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// |
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// To make the changes persist on reboot edit /etc/sysctl.conf or |
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// /usr/lib/sysctl.d/50-default.conf (details differ per Linux distro; check |
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// your distro's documentation): |
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// |
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// fs.inotify.max_user_watches=124983 |
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// fs.inotify.max_user_instances=128 |
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// |
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// Reaching the limit will result in a "no space left on device" or "too many open |
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// files" error. |
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// |
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// # kqueue notes (macOS, BSD) |
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// |
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// kqueue requires opening a file descriptor for every file that's being watched; |
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// so if you're watching a directory with five files then that's six file |
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// descriptors. You will run in to your system's "max open files" limit faster on |
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// these platforms. |
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// |
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// The sysctl variables kern.maxfiles and kern.maxfilesperproc can be used to |
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// control the maximum number of open files, as well as /etc/login.conf on BSD |
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// systems. |
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// |
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// # macOS notes |
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// |
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// Spotlight indexing on macOS can result in multiple events (see [#15]). A |
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// temporary workaround is to add your folder(s) to the "Spotlight Privacy |
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// Settings" until we have a native FSEvents implementation (see [#11]). |
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// |
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// [#11]: https://github.com/fsnotify/fsnotify/issues/11 |
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// [#15]: https://github.com/fsnotify/fsnotify/issues/15 |
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EOF |
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) |
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|
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new=$(<<EOF |
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// NewWatcher creates a new Watcher. |
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EOF |
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) |
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|
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add=$(<<EOF |
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// Add starts monitoring the path for changes. |
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// |
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// A path can only be watched once; attempting to watch it more than once will |
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// return an error. Paths that do not yet exist on the filesystem cannot be |
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// added. A watch will be automatically removed if the path is deleted. |
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// |
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// A path will remain watched if it gets renamed to somewhere else on the same |
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// filesystem, but the monitor will get removed if the path gets deleted and |
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// re-created, or if it's moved to a different filesystem. |
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// |
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// Notifications on network filesystems (NFS, SMB, FUSE, etc.) or special |
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// filesystems (/proc, /sys, etc.) generally don't work. |
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// |
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// # Watching directories |
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// |
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// All files in a directory are monitored, including new files that are created |
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// after the watcher is started. Subdirectories are not watched (i.e. it's |
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// non-recursive). |
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// |
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// # Watching files |
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// |
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// Watching individual files (rather than directories) is generally not |
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// recommended as many tools update files atomically. Instead of "just" writing |
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// to the file a temporary file will be written to first, and if successful the |
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// temporary file is moved to to destination removing the original, or some |
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// variant thereof. The watcher on the original file is now lost, as it no |
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|
103 |
// longer exists. |
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|
104 |
// |
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|
105 |
// Instead, watch the parent directory and use Event.Name to filter out files |
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|
106 |
// you're not interested in. There is an example of this in [cmd/fsnotify/file.go]. |
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|
107 |
EOF |
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|
108 |
) |
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|
109 |
|
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|
110 |
remove=$(<<EOF |
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|
111 |
// Remove stops monitoring the path for changes. |
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|
112 |
// |
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|
113 |
// Directories are always removed non-recursively. For example, if you added |
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|
114 |
// /tmp/dir and /tmp/dir/subdir then you will need to remove both. |
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|
115 |
// |
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|
116 |
// Removing a path that has not yet been added returns [ErrNonExistentWatch]. |
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|
117 |
EOF |
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|
118 |
) |
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|
119 |
|
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|
120 |
close=$(<<EOF |
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|
121 |
// Close removes all watches and closes the events channel. |
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122 |
EOF |
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123 |
) |
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|
124 |
|
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|
125 |
watchlist=$(<<EOF |
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|
126 |
// WatchList returns all paths added with [Add] (and are not yet removed). |
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|
127 |
EOF |
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|
128 |
) |
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|
129 |
|
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130 |
events=$(<<EOF |
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|
131 |
// Events sends the filesystem change events. |
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132 |
// |
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|
133 |
// fsnotify can send the following events; a "path" here can refer to a |
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|
134 |
// file, directory, symbolic link, or special file like a FIFO. |
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135 |
// |
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|
136 |
// fsnotify.Create A new path was created; this may be followed by one |
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|
137 |
// or more Write events if data also gets written to a |
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|
138 |
// file. |
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139 |
// |
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|
140 |
// fsnotify.Remove A path was removed. |
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|
141 |
// |
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|
142 |
// fsnotify.Rename A path was renamed. A rename is always sent with the |
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|
143 |
// old path as Event.Name, and a Create event will be |
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|
144 |
// sent with the new name. Renames are only sent for |
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|
145 |
// paths that are currently watched; e.g. moving an |
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|
146 |
// unmonitored file into a monitored directory will |
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|
147 |
// show up as just a Create. Similarly, renaming a file |
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|
148 |
// to outside a monitored directory will show up as |
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|
149 |
// only a Rename. |
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150 |
// |
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|
151 |
// fsnotify.Write A file or named pipe was written to. A Truncate will |
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|
152 |
// also trigger a Write. A single "write action" |
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|
153 |
// initiated by the user may show up as one or multiple |
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|
154 |
// writes, depending on when the system syncs things to |
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|
155 |
// disk. For example when compiling a large Go program |
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|
156 |
// you may get hundreds of Write events, so you |
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|
157 |
// probably want to wait until you've stopped receiving |
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|
158 |
// them (see the dedup example in cmd/fsnotify). |
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|
159 |
// |
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|
160 |
// fsnotify.Chmod Attributes were changed. On Linux this is also sent |
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|
161 |
// when a file is removed (or more accurately, when a |
05c40b36d3b2
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|
162 |
// link to an inode is removed). On kqueue it's sent |
05c40b36d3b2
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|
163 |
// and on kqueue when a file is truncated. On Windows |
05c40b36d3b2
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|
164 |
// it's never sent. |
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|
165 |
EOF |
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|
166 |
) |
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|
167 |
|
05c40b36d3b2
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|
168 |
errors=$(<<EOF |
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|
169 |
// Errors sends any errors. |
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|
170 |
EOF |
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|
171 |
) |
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|
172 |
|
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|
173 |
set-cmt() { |
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|
174 |
local pat=$1 |
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|
175 |
local cmt=$2 |
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|
176 |
|
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|
177 |
IFS=$'\n' local files=($(grep -n $pat backend_*~*_test.go)) |
05c40b36d3b2
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|
178 |
for f in $files; do |
05c40b36d3b2
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|
179 |
IFS=':' local fields=($=f) |
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|
180 |
local file=$fields[1] |
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|
181 |
local end=$(( $fields[2] - 1 )) |
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|
182 |
|
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|
183 |
# Find start of comment. |
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|
184 |
local start=0 |
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|
185 |
IFS=$'\n' local lines=($(head -n$end $file)) |
05c40b36d3b2
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|
186 |
for (( i = 1; i <= $#lines; i++ )); do |
05c40b36d3b2
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|
187 |
local line=$lines[-$i] |
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|
188 |
if ! grep -q '^[[:space:]]*//' <<<$line; then |
05c40b36d3b2
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|
189 |
start=$(( end - (i - 2) )) |
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|
190 |
break |
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|
191 |
fi |
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|
192 |
done |
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|
193 |
|
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|
194 |
head -n $(( start - 1 )) $file >/tmp/x |
05c40b36d3b2
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|
195 |
print -r -- $cmt >>/tmp/x |
05c40b36d3b2
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|
196 |
tail -n+$(( end + 1 )) $file >>/tmp/x |
05c40b36d3b2
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|
197 |
mv /tmp/x $file |
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|
198 |
done |
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|
199 |
} |
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|
200 |
|
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|
201 |
set-cmt '^type Watcher struct ' $watcher |
05c40b36d3b2
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|
202 |
set-cmt '^func NewWatcher(' $new |
05c40b36d3b2
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|
203 |
set-cmt '^func (w \*Watcher) Add(' $add |
05c40b36d3b2
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|
204 |
set-cmt '^func (w \*Watcher) Remove(' $remove |
05c40b36d3b2
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|
205 |
set-cmt '^func (w \*Watcher) Close(' $close |
05c40b36d3b2
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|
206 |
set-cmt '^func (w \*Watcher) WatchList(' $watchlist |
05c40b36d3b2
Bump to version 3.0.0-dev, using madon v3
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|
207 |
set-cmt '^[[:space:]]*Events *chan Event$' $events |
05c40b36d3b2
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|
208 |
set-cmt '^[[:space:]]*Errors *chan error$' $errors |