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`whenwasit path`
little thing meant to be called in a git-hook as to keep track of
file creation and modification dates, which are important to me.
dumps csv output on stdout, errors abort with a panic.
**CSV Output Defintion:**
data is output on `stdout` in a CSV format. because there are
varying ways to make a CSV, it's described in detail below.
- there is no data header; the first row is data
- the data rows are in the format `path,btime,mtime,atime`
- `path`: file path relative to the root that was provided on the command line
- `btime`: time of file creation; birth time
- `mtime`: time file was last modified
- `atime`: time file was last accessed
- if the `path` contains a comma (`,`) or a backslash (`\`), it is escape with a backslash
- if any one of the time cannot be attained, the field is left empty.
**behavior:**
prints a row for the current directory, a row for each file, and
then goes into each directory recursively.
this results in reading the directory twice as to not cache the
directory listings in memory.
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