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Support extended CIGAR strings #12

Description

@dpmccabe

In SAM_entry.pm, the parser doesn't support extended CIGAR strings, like those generated by minimap2 with the --eqx option. Here's a sample read:

m84173_240316_095122_s1/100012312/ccs/3767_4787 0       chr2    17601892        60      172S31=1X262=1X553=   *       0       0       GACTCTTAGTTCCTAATTTGGTATTAATAGGAAATATGAATTATTATATACTTAATAAAATTTAGAATTCTGTTAAAATGCATGATCTCTATCAAATTTCCTATGCATCTACATGCAATAATGAACTCTTGGTTATTAATTTTTTTTTTCTTTTTGAGACGGAGTATCGCTCTGCCACCGCACTCCAGCCTGAATGACAGAGCAAGACTCCACCTAAAAAAAGTAAAAGAAAAAAAAGAGGAAGAATTAGCACATTTCTATTACAGAATTGGACTTGAACATGCAAAATCATGTCTGGATTTCTCAGTGAAAAGCTGTTTTACGTTAGTGGACTCTTCTAACATTTTGAAATGGTGATCTGGATTTGGGATCTGGCTATCACTGACCCACCTTGGGTCTGTGAATGACCAACTCACCTAGGTGGGAGTCAGTTACCCCTGCCCTCCAGTGGCCCATGGAGCACCTGTGGGAAGAAGGCTTTCTGTCTTACTGATTCTTCCATCTTTGGTGTCCAATTGGAAGGATTCCTGGGCCATTGACTGTTTCTCTCTGAGGGTTGTTATGAAGCTTGTGGCTCCATTCTCATGACTACTGTGATATTTCTGTGAATCTGACCCTGCCCTGAACTCCAGGTCAGCTTCTCCCCTCACAGGTGAAATCCAGTCCTATTATAACTGGGGGAGTGATAGACAGATTTTGGGCTATTTTACGACCAACTTTCCCTGTCTAAAATGTCAAAGCAGCCGGGTGTGGTGGCTCACGCCTGTAATCCCAGCACTTTGGGATGCCGAGGCGGGTGGATCACCTGAGGCCAGGAGTTTGAGACCAGCCTGGCCAACACGGCGAAACTCTGTCTCTACTAAAGATATAAAAATTAGCCAGGTATGGTGCATGCCTGTAATCCCAGCTACTGGGGAGGCTGAGGCAGGAGAATTGCTTAAACCTAGGAGGCGGCAGTTGCATTGAGCCAAGATCACGCCATTGCACCCCAAGCTGGAAGACAGAGTAAGACTCCATCTC        IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII7IIIIIIIIII7IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIDIIIIIIIIIIIIIDIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIDIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIDIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIDIIIIIIIIDIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIDIIIIIIIIIIII<IIIIIIIIIIIIIIIIIII2IIIIIDIIIIIIIIIIIIIIIIDIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIDIIIIIIIIIIIIIIIIIDIIII7IIIIIIIIIIIIIIIIIII7IIIIIIIIIIIIII<IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII        NM:i:2  ms:i:838        AS:i:838        nn:i:0  ts:A:+tp:A:P  cm:i:208        s1:i:736        s2:i:0  de:f:0.0024     SA:Z:chr2,17749669,-,846S173M1S,60,0;rl:i:324

Characters like = and X in 172S31=1X262=1X553= are used instead of M, but that might be the only relevant difference. Something like jvarkit can easily preprocess the BAM to work here, but it would be great if this tool supported the notation.

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