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#!/usr/bin/env node
// [start-readme]
//
// Helps you move (a.k.a. rename) a file or a folder and does what's
// needed with frontmatter redirect_from.
//
// [end-readme]
import
fs
from
'fs'
import
path
from
'path'
import
{
execSync
}
from
'child_process'
import
{
program
}
from
'commander'
import
chalk
from
'chalk'
import
walk
from
'walk-sync'
import
yaml
from
'js-yaml'
import
fm
from
'../lib/frontmatter.js'
import
readFrontmatter
from
'../lib/read-frontmatter.js'
const
CONTENT_ROOT
=
path
.
resolve
(
'content'
)
const
DATA_ROOT
=
path
.
resolve
(
'data'
)
const
REDIRECT_FROM_KEY
=
'redirect_from'
const
CHILDREN_KEY
=
'children'
const
CHILDGROUPS_KEY
=
'childGroups'
program
.
description
(
'Helps you move (rename) files or folders'
)
.
option
(
'-v, --verbose'
,
'Verbose outputs'
)
.
option
(
'--no-git'
,
"DON'T use 'git mv' and 'git commit' to move the file. Just regular file moves."
)
.
option
(
'--undo'
,
'Reverse of moving. I.e. moving it back. Only applies to the last run.'
)
.
arguments
(
'old'
,
'old file or folder name'
)
.
arguments
(
'new'
,
'new file or folder name'
)
.
parse
(
process
.
argv
)
main
(
program
.
opts
(
)
,
program
.
args
)
async
function
main
(
opts
,
nameTuple
)
{
const
{
verbose
,
undo
}
=
opts
if
(
nameTuple
.
length
!==
2
)
{
console
.
error
(
chalk
.
red
(
`Must be exactly 2 file paths as arguments. Not
${
nameTuple
.
length
}
arguments.`
)
)
process
.
exit
(
1
)
}
const
[
old
,
new_
]
=
nameTuple
if
(
old
===
new_
)
{
throw
new
Error
(
'old == new'
)
}
const
uppercases
=
new_
.
match
(
/
[
A
-
Z
]
+
/
g
)
||
[
]
if
(
uppercases
.
length
>
0
)
{
throw
new
Error
(
`Uppercase in file name not allowed ('
${
uppercases
}
')`
)
}
let
oldPath
=
old
let
newPath
=
new_
if
(
undo
)
{
oldPath
=
new_
newPath
=
old
}
else
{
oldPath
=
old
newPath
=
new_
}
// The file you're about to move needs to exist
if
(
!
fs
.
existsSync
(
oldPath
)
)
{
console
.
error
(
chalk
.
red
(
`
${
oldPath
}
does not exist.`
)
)
process
.
exit
(
1
)
}
let
isFolder
=
fs
.
lstatSync
(
oldPath
)
.
isDirectory
(
)
// Before validating, see if we need to fake that the newPath should be.
// This is to mimic how bash `mv` works where you can do:
//
// mv some/place/a/file.txt destin/ation/
//
// which is implied to mean the same as;
//
// mv some/place/a/file.txt destin/ation/file.txt
//
if
(
undo
)
{
if
(
isFolder
)
{
const
wouldBe
=
path
.
join
(
oldPath
,
path
.
basename
(
newPath
)
)
// We can't know if the `newPath` is a directory or file because
// whichever it is, it doesn't exist.
if
(
fs
.
existsSync
(
wouldBe
)
&&
!
fs
.
lstatSync
(
wouldBe
)
.
isDirectory
(
)
)
{
isFolder
=
false
oldPath
=
wouldBe
}
}
}
else
{
if
(
!
isFolder
)
{
if
(
fs
.
existsSync
(
newPath
)
&&
fs
.
lstatSync
(
newPath
)
.
isDirectory
(
)
)
{
newPath
=
path
.
join
(
newPath
,
path
.
basename
(
oldPath
)
)
}
}
}
// This will exit non-zero if anything is wrong with these inputs
validateFileInputs
(
oldPath
,
newPath
,
isFolder
)
if
(
isFolder
)
{
// The folder must have an index.md file
const
indexFilePath
=
path
.
join
(
oldPath
,
'index.md'
)
if
(
!
fs
.
existsSync
(
indexFilePath
)
)
{
throw
new
Error
(
`
${
oldPath
}
does not have an index.md file`
)
}
// Gather individual files by walking `oldPath` recursively
// The second argument is
const
files
=
findFilesInFolder
(
oldPath
,
newPath
,
opts
)
// First take care of the `git mv` (or regular rename) part.
if
(
undo
)
{
undoFolder
(
oldPath
,
newPath
,
files
,
opts
)
}
else
{
moveFolder
(
oldPath
,
newPath
,
files
,
opts
)
}
addToChildren
(
newPath
,
removeFromChildren
(
oldPath
,
opts
)
,
opts
)
if
(
undo
)
{
undoFiles
(
files
,
false
,
opts
)
}
else
{
editFiles
(
files
,
false
,
opts
)
}
}
else
{
// When it's just an individual file, it's easier.
const
oldHref
=
makeHref
(
CONTENT_ROOT
,
undo
?
newPath
:
oldPath
)
const
newHref
=
makeHref
(
CONTENT_ROOT
,
undo
?
oldPath
:
newPath
)
const
files
=
[
[
oldPath
,
newPath
,
oldHref
,
newHref
]
]
// First take care of the `git mv` (or regular rename) part.
moveFiles
(
files
,
opts
)
if
(
undo
)
{
undoFiles
(
files
,
true
,
opts
)
}
else
{
editFiles
(
files
,
true
,
opts
)
}
}
if
(
!
undo
)
{
if
(
verbose
)
{
console
.
log
(
chalk
.
yellow
(
'To undo (reverse) what you just did, run the same exact command but with --undo added to the end'
)
)
}
}
}
function
validateFileInputs
(
oldPath
,
newPath
,
isFolder
)
{
if
(
isFolder
)
{
// Make sure that only the last portion of the path is different
// and that all preceeding are equal.
const
[
oldBase
,
oldName
]
=
splitDirectory
(
oldPath
)
const
[
newBase
]
=
splitDirectory
(
newPath
)
if
(
oldBase
!==
newBase
&&
!
existsAndIsDirectory
(
newBase
)
)
{
console
.
error
(
chalk
.
red
(
`When moving a directory, both bases need to be the same. '
${
oldBase
}
' != '
${
newBase
}
'`
)
)
console
.
warn
(
chalk
.
yellow
(
`Only the name (e.g. '
${
oldName
}
') can be different.`
)
)
process
.
exit
(
1
)
}
}
if
(
!
path
.
resolve
(
newPath
)
.
startsWith
(
CONTENT_ROOT
)
)
{
const
relativeRoot
=
path
.
relative
(
'.'
,
CONTENT_ROOT
)
console
.
error
(
chalk
.
red
(
`New path does not start with '
${
relativeRoot
}
'`
)
)
process
.
exit
(
1
)
}
if
(
!
fs
.
existsSync
(
oldPath
)
)
{
console
.
error
(
chalk
.
red
(
`
${
oldPath
}
does not resolve to an existing file or a folder`
)
)
process
.
exit
(
1
)
}
if
(
path
.
basename
(
oldPath
)
===
'index.md'
)
{
console
.
error
(
chalk
.
red
(
`File path can't be 'index.md'. Refer to it by its foldername instead.`
)
)
process
.
exit
(
1
)
}
if
(
path
.
basename
(
newPath
)
===
'index.md'
)
{
console
.
error
(
chalk
.
red
(
`File path can't be 'index.md'. Refer to it by its foldername instead.`
)
)
process
.
exit
(
1
)
}
if
(
fs
.
existsSync
(
newPath
)
)
{
console
.
error
(
chalk
.
red
(
`Can't move to a
${
isFolder
?
'folder'
:
'file'
}
that already exists.`
)
)
process
.
exit
(
1
)
}
if
(
/
\s
/
.
test
(
newPath
)
)
{
throw
new
Error
(
`New path (
${
newPath
}
) can't contain whitespace`
)
}
}
function
existsAndIsDirectory
(
directory
)
{
return
fs
.
existsSync
(
directory
)
&&
fs
.
lstatSync
(
directory
)
.
isDirectory
(
)
}
function
splitDirectory
(
directory
)
{
return
[
path
.
dirname
(
directory
)
,
path
.
basename
(
directory
)
]
}
function
findFilesInFolder
(
oldPath
,
newPath
,
opts
)
{
const
{
undo
,
verbose
}
=
opts
const
files
=
[
]
const
allFiles
=
walk
(
oldPath
,
{
includeBasePath
:
true
,
directories
:
false
}
)
for
(
const
filePath
of
allFiles
)
{
const
newFilePath
=
filePath
.
replace
(
oldPath
,
newPath
)
const
oldHref
=
makeHref
(
CONTENT_ROOT
,
undo
?
newFilePath
:
filePath
)
const
newHref
=
makeHref
(
CONTENT_ROOT
,
undo
?
filePath
:
newFilePath
)
files
.
push
(
[
filePath
,
newFilePath
,
oldHref
,
newHref
]
)
}
if
(
verbose
)
{
console
.
log
(
chalk
.
yellow
(
`Found
${
files
.
length
}
files within
${
oldPath
}
`
)
)
}
return
files
}
function
makeHref
(
root
,
filePath
)
{
const
nameSplit
=
path
.
relative
(
root
,
filePath
)
.
split
(
path
.
sep
)
if
(
nameSplit
.
slice
(
-
1
)
[
0
]
===
'index.md'
)
{
nameSplit
.
pop
(
)
}
else
{
nameSplit
.
push
(
nameSplit
.
pop
(
)
.
replace
(
/
\.
m
d
$
/
,
''
)
)
}
return
'/'
+
nameSplit
.
join
(
'/'
)
}
function
moveFolder
(
oldPath
,
newPath
,
files
,
opts
)
{
const
{
verbose
,
git
:
useGit
}
=
opts
if
(
useGit
)
{
let
cmd
=
`git mv
${
oldPath
}
${
newPath
}
`
if
(
verbose
)
{
console
.
log
(
`git mv command:
${
chalk
.
grey
(
cmd
)
}
`
)
}
execSync
(
cmd
)
cmd
=
`git commit -a -m "renamed
${
files
.
length
}
files"`
if
(
verbose
)
{
console
.
log
(
`git commit command:
${
chalk
.
grey
(
cmd
)
}
`
)
}
execSync
(
cmd
)
}
else
{
fs
.
renameSync
(
oldPath
,
newPath
)
if
(
verbose
)
{
console
.
log
(
`Renamed folder
${
chalk
.
bold
(
oldPath
)
}
to
${
chalk
.
bold
(
newPath
)
}
`
)
}
}
}
function
undoFolder
(
oldPath
,
newPath
,
files
,
opts
)
{
const
{
verbose
,
git
:
useGit
}
=
opts
if
(
useGit
)
{
let
cmd
=
`git mv
${
oldPath
}
${
newPath
}
`
execSync
(
cmd
)
if
(
verbose
)
{
console
.
log
(
`git mv command:
${
chalk
.
grey
(
cmd
)
}
`
)
}
cmd
=
`git commit -a -m "renamed
${
files
.
length
}
files"`
execSync
(
cmd
)
if
(
verbose
)
{
console
.
log
(
`git commit command:
${
chalk
.
grey
(
cmd
)
}
`
)
}
}
else
{
fs
.
renameSync
(
oldPath
,
newPath
)
if
(
verbose
)
{
console
.
log
(
`Renamed folder
${
chalk
.
bold
(
oldPath
)
}
to
${
chalk
.
bold
(
newPath
)
}
`
)
}
}
}
function
getBasename
(
fileOrDirectory
)
{
// Note, can't use fs.lstatSync().isDirectory() because it's just a string
// at this point. It might not exist.
if
(
fileOrDirectory
.
endsWith
(
'index.md'
)
)
{
return
path
.
basename
(
path
.
directory
(
fileOrDirectory
)
)
}
if
(
fileOrDirectory
.
endsWith
(
'.md'
)
)
{
return
path
.
basename
(
fileOrDirectory
)
.
replace
(
/
\.
m
d
$
/
,
''
)
}
return
path
.
basename
(
fileOrDirectory
)
}
function
removeFromChildren
(
oldPath
,
opts
)
{
const
{
verbose
}
=
opts
const
parentFilePath
=
path
.
join
(
path
.
dirname
(
oldPath
)
,
'index.md'
)
const
fileContent
=
fs
.
readFileSync
(
parentFilePath
,
'utf-8'
)
const
{
content
,
data
}
=
readFrontmatter
(
fileContent
)
const
oldName
=
getBasename
(
oldPath
)
let
childrenPosition
=
-
1
if
(
CHILDREN_KEY
in
data
)
{
data
[
CHILDREN_KEY
]
=
data
[
CHILDREN_KEY
]
.
filter
(
(
entry
,
i
)
=>
{
if
(
entry
===
oldName
||
entry
===
`/
${
oldName
}
`
)
{
childrenPosition
=
i
return
false
}
return
true
}
)
if
(
data
[
CHILDREN_KEY
]
.
length
===
0
)
{
delete
data
[
CHILDREN_KEY
]
}
}
const
childGroupPositions
=
[
]
;
(
data
[
CHILDGROUPS_KEY
]
||
[
]
)
.
forEach
(
(
group
,
i
)
=>
{
if
(
group
.
children
)
{
group
.
children
=
group
.
children
.
filter
(
(
entry
,
j
)
=>
{
if
(
entry
===
oldName
||
entry
===
`/
${
oldName
}
`
)
{
childGroupPositions
.
push
(
[
i
,
j
]
)
return
false
}
return
true
}
)
}
}
)
fs
.
writeFileSync
(
parentFilePath
,
readFrontmatter
.
stringify
(
content
,
data
,
{
lineWidth
:
10000
}
)
,
'utf-8'
)
if
(
verbose
)
{
console
.
log
(
`Removed 'children' (
${
oldName
}
) key in
${
parentFilePath
}
`
)
}
return
{
childrenPosition
,
childGroupPositions
}
}
function
addToChildren
(
newPath
,
positions
,
opts
)
{
const
{
verbose
}
=
opts
const
parentFilePath
=
path
.
join
(
path
.
dirname
(
newPath
)
,
'index.md'
)
const
fileContent
=
fs
.
readFileSync
(
parentFilePath
,
'utf-8'
)
const
{
content
,
data
}
=
readFrontmatter
(
fileContent
)
const
newName
=
getBasename
(
newPath
)
const
{
childrenPosition
,
childGroupPositions
}
=
positions
if
(
childrenPosition
>
-
1
)
{
const
children
=
data
[
CHILDREN_KEY
]
||
[
]
let
prefix
=
''
if
(
children
.
every
(
(
entry
)
=>
entry
.
startsWith
(
'/'
)
)
)
{
prefix
+=
'/'
}
if
(
childrenPosition
>
-
1
&&
childrenPosition
<
children
.
length
)
{
children
.
splice
(
childrenPosition
,
0
,
prefix
+
newName
)
}
else
{
children
.
push
(
prefix
+
newName
)
}
data
[
CHILDREN_KEY
]
=
children
}
if
(
CHILDGROUPS_KEY
in
data
)
{
for
(
const
[
groupIndex
,
childrenPosition
]
of
childGroupPositions
)
{
if
(
groupIndex
<
data
[
CHILDGROUPS_KEY
]
.
length
)
{
const
group
=
data
[
CHILDGROUPS_KEY
]
[
groupIndex
]
if
(
childrenPosition
<
group
.
children
.
length
)
{
group
.
children
.
splice
(
childrenPosition
,
0
,
newName
)
}
else
{
group
.
children
.
push
(
newName
)
}
}
}
}
fs
.
writeFileSync
(
parentFilePath
,
readFrontmatter
.
stringify
(
content
,
data
,
{
lineWidth
:
10000
}
)
,
'utf-8'
)
if
(
verbose
)
{
console
.
log
(
`Added 'children' (
${
newName
}
) key in
${
parentFilePath
}
`
)
}
}
function
moveFiles
(
files
,
opts
)
{
const
{
verbose
,
git
:
useGit
}
=
opts
// Before we do anything, assert that the files are valid
for
(
const
[
oldPath
]
of
files
)
{
const
fileContent
=
fs
.
readFileSync
(
oldPath
,
'utf-8'
)
const
{
errors
}
=
fm
(
fileContent
,
{
filepath
:
oldPath
}
)
errors
.
forEach
(
(
error
,
i
)
=>
{
if
(
!
i
)
console
.
warn
(
chalk
.
yellow
(
`Error parsing file (
${
oldPath
}
) frontmatter:`
)
)
console
.
error
(
`
${
chalk
.
red
(
error
.
message
)
}
:
${
chalk
.
yellow
(
error
.
reason
)
}
`
)
}
)
if
(
errors
.
length
>
0
)
throw
new
Error
(
'There were more than 0 parse errors'
)
}
// In the first loop, we exclusively perform the rename. No file edits!
// The reason is that we don't want lump renaming and edits in the same
// git commit.
// By having a dedicated git commit that purely renames (without changing
// any content) is best practice to avoid complex 3-way diffs that
// `git merge` does when you later have to merge in the latest `main`
// into your ongoing renaming branch.
for
(
const
[
oldPath
,
newPath
]
of
files
)
{
if
(
verbose
)
{
console
.
log
(
`Moving
${
chalk
.
bold
(
oldPath
)
}
to
${
chalk
.
bold
(
newPath
)
}
`
)
}
if
(
useGit
)
{
const
cmd
=
`git mv
${
oldPath
}
${
newPath
}
`
execSync
(
cmd
)
if
(
verbose
)
{
console
.
log
(
`git mv command:
${
chalk
.
grey
(
cmd
)
}
`
)
}
}
else
{
fs
.
renameSync
(
oldPath
,
newPath
)
if
(
verbose
)
{
console
.
log
(
`Renamed
${
chalk
.
bold
(
oldPath
)
}
to
${
chalk
.
bold
(
newPath
)
}
`
)
}
}
}
if
(
useGit
)
{
const
cmd
=
`git commit -a -m "renamed
${
files
.
length
}
files"`
execSync
(
cmd
)
if
(
verbose
)
{
console
.
log
(
`git commit command:
${
chalk
.
grey
(
cmd
)
}
`
)
}
}
}
function
editFiles
(
files
,
updateParent
,
opts
)
{
const
{
verbose
,
git
:
useGit
}
=
opts
// Second loop. This time our only job is to edit the `redirects_from`
// frontmatter key.
// See comment in the first loop above for why we're looping over the files
// two times.
for
(
const
[
oldPath
,
newPath
,
oldHref
,
newHref
]
of
files
)
{
const
fileContent
=
fs
.
readFileSync
(
newPath
,
'utf-8'
)
const
{
content
,
data
}
=
readFrontmatter
(
fileContent
)
if
(
!
(
REDIRECT_FROM_KEY
in
data
)
)
{
data
[
REDIRECT_FROM_KEY
]
=
[
]
}
data
[
REDIRECT_FROM_KEY
]
.
push
(
oldHref
)
fs
.
writeFileSync
(
newPath
,
readFrontmatter
.
stringify
(
content
,
data
,
{
lineWidth
:
10000
}
)
,
'utf-8'
)
if
(
verbose
)
{
console
.
log
(
`Added
${
oldHref
}
to 'redirects_from' in
${
newPath
}
`
)
}
if
(
updateParent
)
{
addToChildren
(
newPath
,
removeFromChildren
(
oldPath
,
opts
)
,
opts
)
}
// Perhaps this was mentioned in a 'guide' in a learning track
for
(
const
filePath
of
findInLearningTracks
(
oldHref
)
)
{
changeLearningTracks
(
filePath
,
oldHref
,
newHref
)
if
(
verbose
)
{
console
.
log
(
`Updated learning tracks in
${
filePath
}
`
)
}
}
}
if
(
useGit
)
{
const
cmd
=
`git commit -a -m "set
${
REDIRECT_FROM_KEY
}
on
${
files
.
length
}
files"`
execSync
(
cmd
)
if
(
verbose
)
{
console
.
log
(
`git commit command:
${
chalk
.
grey
(
cmd
)
}
`
)
}
}
}
function
undoFiles
(
files
,
updateParent
,
opts
)
{
const
{
verbose
,
git
:
useGit
}
=
opts
// First undo any edits to the file
for
(
const
[
oldPath
,
newPath
,
oldHref
,
newHref
]
of
files
)
{
const
fileContent
=
fs
.
readFileSync
(
newPath
,
'utf-8'
)
const
{
content
,
data
}
=
readFrontmatter
(
fileContent
)
data
[
REDIRECT_FROM_KEY
]
=
(
data
[
REDIRECT_FROM_KEY
]
||
[
]
)
.
filter
(
(
entry
)
=>
entry
!==
oldHref
)
if
(
data
[
REDIRECT_FROM_KEY
]
.
length
===
0
)
{
delete
data
[
REDIRECT_FROM_KEY
]
}
fs
.
writeFileSync
(
newPath
,
readFrontmatter
.
stringify
(
content
,
data
,
{
lineWidth
:
10000
}
)
,
'utf-8'
)
if
(
updateParent
)
{
addToChildren
(
newPath
,
removeFromChildren
(
oldPath
,
opts
)
,
opts
)
}
// Perhaps this was mentioned in a 'guide' in a learning track
for
(
const
filePath
of
findInLearningTracks
(
newHref
)
)
{
changeLearningTracks
(
filePath
,
newHref
,
oldHref
)
if
(
verbose
)
{
console
.
log
(
`Updated learning tracks in
${
filePath
}
`
)
}
}
}
if
(
useGit
)
{
const
cmd
=
`git commit -a -m "unset
${
REDIRECT_FROM_KEY
}
on
${
files
.
length
}
files"`
execSync
(
cmd
)
if
(
verbose
)
{
console
.
log
(
`git commit command:
${
chalk
.
grey
(
cmd
)
}
`
)
}
}
}
function
findInLearningTracks
(
href
)
{
const
allFiles
=
walk
(
path
.
join
(
DATA_ROOT
,
'learning-tracks'
)
,
{
globs
:
[
'*.yml'
]
,
includeBasePath
:
true
,
directories
:
false
,
}
)
const
found
=
[
]
for
(
const
filePath
of
allFiles
)
{
const
tracks
=
yaml
.
load
(
fs
.
readFileSync
(
filePath
,
'utf-8'
)
)
if
(
Object
.
values
(
tracks
)
.
find
(
(
track
)
=>
{
const
guides
=
track
.
guides
||
[
]
return
guides
.
includes
(
href
)
}
)
)
{
found
.
push
(
filePath
)
}
}
return
found
}
function
changeLearningTracks
(
filePath
,
oldHref
,
newHref
)
{
// Can't deserialize and serialize the Yaml because it would lose
// formatting and comments. So regex replace it.
const
regex
=
new
RegExp
(
`-
${
oldHref
}
$`
,
'gm'
)
const
oldContent
=
fs
.
readFileSync
(
filePath
,
'utf-8'
)
const
newContent
=
oldContent
.
replace
(
regex
,
`-
${
newHref
}
`
)
fs
.
writeFileSync
(
filePath
,
newContent
,
'utf-8'
)
}
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