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[nnn.git] / plugins / chksum
1 #!/usr/bin/env sh
2
3 # Description: Create and verify checksums
4 #
5 # Note:  On macOS, install the relevant checksum packages from Homebrew with:
6 #            brew install coreutils
7 #
8 # Details:
9 #   - selection: it will generate one file with the checksums and filenames
10 #                (and with paths if they are in another directory)
11 #                output checksum filename format: checksum_timestamp.checksum_type
12 #   - file: if the file is a checksum, the plugin does the verification
13 #           if the file is not a checksum, checksum will be generated for it
14 #           the output checksum filename will be filename.checksum_type
15 #   - directory: recursively calculates checksum for all the files in the dir
16 #                the output checksum filename will be directory.checksum_type
17 #
18 # Shell: POSIX compliant
19 # Authors: ath3, Arun Prakash Jana
20
21 selection=${NNN_SEL:-${XDG_CONFIG_HOME:-$HOME/.config}/nnn/.selection}
22 resp=f
23 chsum=md5
24
25 checksum_type()
26 {
27     echo "possible checksums: md5, sha1, sha224, sha256, sha384, sha512"
28     printf "create md5 (m), sha256 (s), sha512 (S) (or type one of the above checksums) [default=m]: "
29     read -r chsum_resp
30     for chks in md5 sha1 sha224 sha256 sha384 sha512
31     do
32         if [ "$chsum_resp" = "$chks" ]; then
33             chsum=$chsum_resp
34             return
35         fi
36     done
37     if [ "$chsum_resp" = "s" ]; then
38         chsum=sha256
39     elif [ "$chsum_resp" = "S" ]; then
40         chsum=sha512
41     fi
42 }
43
44 if [ -s "$selection" ]; then
45     printf "work with selection (s) or current file (f) [default=f]: "
46     read -r resp
47 fi
48
49 if [ "$resp" = "s" ]; then
50     checksum_type
51     sed 's|'"$PWD/"'||g' < "$selection" | xargs -0 -I{} ${chsum}sum {} > "checksum_$(date '+%Y%m%d%H%M').$chsum"
52
53     # Clear selection
54     if [ -p "$NNN_PIPE" ]; then
55         printf "-" > "$NNN_PIPE"
56     fi
57 elif [ -n "$1" ]; then
58     if [ -f "$1" ]; then
59         for chks in md5 sha1 sha224 sha256 sha384 sha512
60         do
61             if echo "$1" | grep -q \.${chks}$; then
62                 ${chks}sum -c < "$1"
63                 read -r _
64                 exit
65             fi
66         done
67         checksum_type
68         file=$(basename "$1").$chsum
69         ${chsum}sum "$1" > "$file"
70     elif [ -d "$1" ]; then
71         checksum_type
72         file=$(basename "$1").$chsum
73         find "$1" -type f -exec ${chsum}sum "{}" + > "$file"
74     fi
75 fi