Fish functions

This is a placeholder for my commonly used fish shell functions — saved as files under ~/.config/fish/functions/.

1. For system information: sbcinf.fish

   # sbcinf.fish
   function sbcinf
       set -l mem (free -h | awk '/Mem:/ {print $3 "/" $2}')
       set -l dsk (df -h | awk '/\/$/ {print $3 "/" $2}')
       set -l tem (vcgencmd measure_temp | grep -o -E '[[:digit:]].*')
       set -l pow (vcgencmd measure_volts | sed 's/volt=//g')
       set -l ipa (hostname -I | awk '{print $1}')
       set -l upt (uptime -p | sed 's/^up //')
   
       echo "Board temp: $tem"
       echo "Disk usage: $dsk"
       echo "IP address: $ipa"
       echo "Memory use: $mem"
       echo "Power cons: $pow"
       echo "Sys uptime: $upt"
   end
   

2. For downloading a file from GitHub repo. with ghdl user/repo/file.ext. If specific about a branch, then this works too: ghdl user/repo@master/file.ext

   # ghdl.fish
   function ghdl
       if test (count $argv) -ne 1
           echo "Usage: ghdl user/repo[@branch]/path/to/file"
           return 1
       end
   
       set input $argv[1]
   
       # Split the input into repo and path
       set repo_part (echo $input | cut -d'/' -f1-2)
       set path_part (echo $input | cut -d'/' -f3-)
   
       # Extract user and repo (and optional branch)
       set user (echo $repo_part | cut -d'/' -f1)
       set repo_branch (echo $repo_part | cut -d'/' -f2)
   
       if string match -q '*@*' $repo_branch
           set repo (echo $repo_branch | cut -d'@' -f1)
           set branch (echo $repo_branch | cut -d'@' -f2)
       else
           set repo $repo_branch
           set branch "master"  # default fallback branch
       end
   
       if test -z "$user" -o -z "$repo" -o -z "$path_part"
           echo "Error: Must be in the form user/repo[@branch]/path/to/file"
           return 1
       end
   
       # Construct modern raw.githubusercontent.com URL
       set url "https://raw.githubusercontent.com/$user/$repo/refs/heads/$branch/$path_part"
   
       echo "Downloading from: $url"
       curl -LO $url
   end
   

3. Push functions

   # push function
   #   gp master // normal push to master repo
   #   gpp bb    // rebased push to bb repo
   #
   function gp
     git push -u origin $argv[1]
   end
   function gpp
     git push -u origin +$argv[1]
   end
   

4. Rebase function

   # gr.fish
   # examples:
   #   gr 4 master
   #   gr 3 bb
   #
   function gr
     git rebase -i origin/$argv[2]~$argv[1] $argv[2]
   end
   

5. Get the latest release version of a GitHub repo.

   # glr.fish
   # e.g. glr "ckunte/tce"
   function glr \
       --argument-names user_repo
       curl \
           --silent \
           "https://api.github.com/repos/$user_repo/releases/latest" \
       | string match --regex '"tag_name": "\K.*?(?=")'
   end
   

6. Check file hash

   # check_hashes.fish
   function check_hashes
       # Ensure the user provided a file argument
       if test (count $argv) -ne 1
           echo "Usage: check_hashes <file>"
           return 1
       end
       # Store the file path
       set file $argv[1]
       # Check if the file exists
       if not test -e $file
           echo "Error: File '$file' does not exist."
           return 1
       end
       # Calculate and display the RMD160 hash
       echo "RMD160 hash:"
       printf "%s" "$file" | openssl dgst -rmd160
       # Calculate and display the SHA256 hash
       echo "SHA256 hash:"
       printf "%s" "$file" | openssl dgst -sha256
   end
   

7. Open folder from within WSL

   # open.fish
   function open
       if test (count $argv) -eq 0
           # No arguments: open current directory
           explorer.exe .
       else
           for arg in $argv
               # If it's a URL
               if string match -qr '^https?://|^mailto:' $arg
                   explorer.exe $arg
               # If it's a file or directory that exists
               else if test -e $arg
                   explorer.exe (wslpath -w $arg)
               # If it's a Windows-style path (C:\Users\...), try passing directly
               else if string match -qr '^[A-Za-z]:\\' $arg
                   explorer.exe $arg
               else
                   echo "open: '$arg' not found or invalid" >&2
               end
           end
       end
   end
   

8. Rename photos

   # renfoto.fish: rename photos e.g. renfoto ST-159
   function renfoto
       set prefix $argv[1]
       rename -N ...01 -X -e '$_ = $prefix . "-photo-$N"' *.png
   end