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File tree functionality and styles (srcbookdev#344)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| import type { DirEntryType, FsEntryTreeType } from '@srcbook/shared'; | ||
|
|
||
| /** | ||
| * Sorts a file tree (in place) by name. Folders come first, then files. | ||
| */ | ||
| export function sortTree(tree: DirEntryType): DirEntryType { | ||
| tree.children?.sort((a, b) => { | ||
| if (a.type === 'directory') sortTree(a); | ||
| if (b.type === 'directory') sortTree(b); | ||
| if (a.type === 'directory' && b.type === 'file') return -1; | ||
| if (a.type === 'file' && b.type === 'directory') return 1; | ||
| return a.name.localeCompare(b.name); | ||
| }); | ||
|
|
||
| return tree; | ||
| } | ||
|
|
||
| /** | ||
| * Update a node in the file tree. | ||
| * | ||
| * This function is complex due to the merging of children. We do it to maintain | ||
| * nested state of a given tree. Consider the following file tree that the user | ||
| * has open in their file tree viewer: | ||
| * | ||
| * /src | ||
| * │ | ||
| * ├── components | ||
| * │ ├── ui | ||
| * │ │ └── table | ||
| * │ │ ├── index.tsx | ||
| * │ │ └── show.tsx | ||
| * │ │ | ||
| * │ └── use-files.tsx | ||
| * │ | ||
| * └── index.tsx | ||
| * | ||
| * If the user closes and then reopens the "components" folder, the reopening of | ||
| * the "components" folder will make a call to load its children. However, calls | ||
| * to load children only load the immediate children, not all nested children. | ||
| * This means that the call will not load the "ui" folder's children. | ||
| * | ||
| * Now, given that the user had previously opened the "ui" folder and we have the | ||
| * results of that folder loaded in our state, we don't want to throw away those | ||
| * values. So we merge the children of the new node and any nested children of | ||
| * the old node. | ||
| * | ||
| * This supports behavior where a user may open many nested folders and then close | ||
| * and later reopen a ancestor folder. We want the tree to look the same when the | ||
| * reopen occurs with only the immediate children updated. | ||
| */ | ||
| export function updateTree(tree: DirEntryType, node: DirEntryType): DirEntryType { | ||
| if (tree.path === node.path) { | ||
| if (node.children === null) { | ||
| return { ...node, children: tree.children }; | ||
| } else { | ||
| return { ...node, children: merge(tree.children, node.children) }; | ||
| } | ||
| } | ||
|
|
||
| if (tree.children) { | ||
| return { | ||
| ...tree, | ||
| children: tree.children.map((entry) => { | ||
| if (entry.type === 'directory') { | ||
| return updateTree(entry, node); | ||
| } else { | ||
| return entry; | ||
| } | ||
| }), | ||
| }; | ||
| } | ||
|
|
||
| return tree; | ||
| } | ||
|
|
||
| function merge(oldChildren: FsEntryTreeType | null, newChildren: FsEntryTreeType): FsEntryTreeType { | ||
| if (!oldChildren) { | ||
| return newChildren; | ||
| } | ||
|
|
||
| return newChildren.map((newChild) => { | ||
| const oldChild = oldChildren.find((old) => old.path === newChild.path); | ||
|
|
||
| if (oldChild && oldChild.type === 'directory' && newChild.type === 'directory') { | ||
| return { | ||
| ...newChild, | ||
| children: | ||
| newChild.children === null | ||
| ? oldChild.children | ||
| : merge(oldChild.children, newChild.children), | ||
| }; | ||
| } | ||
|
|
||
| return newChild; | ||
| }); | ||
| } |
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