fmt: stop breaking up words

[mknos]

• I was annoyed with the old fmt algorithm because a word gets incorrectly chopped in the middle
• Take a hint about parsing from NetBSD fmt.c source which splits input into word/whitespace_suffix pairs
• Take another hint about paragraphing from GNU version output
• We know the paragraph is finished when the indentation level of current word differs from the previous, or if we see two newlines in a row

%ifconfig | head -n 16 | perl fmt -w 52
eth0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500 
        ether dc:a6:32:e1:12:27  txqueuelen 1000  
        (Ethernet) RX packets 0  bytes 0 (0.0 B) 
        RX errors 0  dropped 0  overruns 0  frame 0 
        TX packets 0  bytes 0 (0.0 B) 
        TX errors 0  dropped 0 overruns 0  carrier 0  
        collisions 0 

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536 
        inet 127.0.0.1  netmask 255.0.0.0 
        inet6 ::1  prefixlen 128  scopeid 0x10<host> 
        loop  txqueuelen 1000  (Local Loopback) 
        RX packets 42  bytes 4449 (4.3 KiB) 
        RX errors 0  dropped 0  overruns 0  frame 0 
        TX packets 42  bytes 4449 (4.3 KiB) 
        TX errors 0  dropped 0 overruns 0  carrier 0  
        collisions 0 


%ifconfig | head -n 16 | perl fmt -w 42
eth0: flags=4099<UP,BROADCAST,MULTICAST>  
mtu 1500 
        ether dc:a6:32:e1:12:27  txqueuelen 
        1000  (Ethernet) RX packets 0  
        bytes 0 (0.0 B) RX errors 0  
        dropped 0  overruns 0  frame 0 TX 
        packets 0  bytes 0 (0.0 B) TX 
        errors 0  dropped 0 overruns 0  
        carrier 0  collisions 0 

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 
65536 
        inet 127.0.0.1  netmask 255.0.0.0 
        inet6 ::1  prefixlen 128  scopeid 
        0x10<host> loop  txqueuelen 1000  
        (Local Loopback) RX packets 42  
        bytes 4449 (4.3 KiB) RX errors 0  
        dropped 0  overruns 0  frame 0 TX 
        packets 42  bytes 4449 (4.3 KiB) TX 
        errors 0  dropped 0 overruns 0  
        carrier 0  collisions 0

[coveralls]

Pull Request Test Coverage Report for Build 12195575995

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 72.464%

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Totals
Change from base Build 12185242343:	0.0%
Covered Lines:	350
Relevant Lines:	483

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💛 - Coveralls

[briandfoy]

changes: use GNU's method for formatting so single words aren't broken up